x402watch

37,650 paid endpoints are listed. 23,105 answered a real 402 at the last check.

Every x402 endpoint on the Coinbase Bazaar and x402scan, probed unpaid every six hours. A listing tells you the price a seller wrote down. This tells you whether the endpoint is reachable, whether it charges what it declared, and how fast it answers. Ranked by an assay score out of 100.

Last check 2026-09-30 12:50 UTC · 37,650 probed

23,105 answering 4029,225 down4,327 rejecting993 no paywall2,783 price drift
  1. 80api.magentlab.com/api/calc/centorCentor or McIsaac (age-modified) score for streptococcal pharyngitis from four caller-assigned findings. edition=centor (max 4) or edition=mcisaac (age 3-14 +1, 15-44 0, >=45 -1, max 5) is required; magent does not pick one. Deterministic published score with citation; not a test-or-treat protocol.$0.005 $0.007 Base782 ms1 payers100% up
  2. 80api.magentlab.com/api/calc/piro_capRello 2009 PIRO score for ICU community-acquired pneumonia: comorbidities (COPD or immunocompromise count as one feature) + age >70 + multilobar opacities + shock + severe hypoxemia + acute renal failure + bacteremia + ARDS. Each 1; max 8. Bands low 0-2, mild 3, high 4, very high 5-8. Not CURB-65, PSI, or APACHE II. magent does not interpret a chest radiograph. Not a diagnosis.$0.005 $0.007 Base529 ms1 payers100% up
  3. 80api.magentlab.com/api/calc/qtcHeart-rate-corrected QT (Bazett or Fridericia). formula is required; magent does not pick one silently. Deterministic published correction with citation.$0.005 $0.007 Base787 ms1 payers100% up
  4. 80api.magentlab.com/api/calc/urine_anion_gapUrine anion gap from urine sodium, potassium, and chloride (Na + K − Cl). Batlle 1988 interpretive band: negative suggests increased NH4+ (GI bicarbonate loss); positive suggests impaired NH4+ (RTA). Deterministic published arithmetic with citation; not a diagnosis.$0.005 $0.007 Base670 ms1 payers100% up
  5. 80api.magentlab.com/api/calc/free_water_deficitFree water deficit from weight, sex, and measured Na using Adrogué–Madias TBW (0.6 male / 0.5 female). Deterministic published arithmetic with citation; not a water-replacement infusion protocol.$0.005 $0.007 Base923 ms1 payers100% up
  6. 80api.magentlab.com/api/calc/serum_osmolalityWorthley 1987 calculated serum osmolality: 2×Na + glucose/18 + BUN/2.8. Optional osmolar gap when a measured osm is supplied. Deterministic published arithmetic with citation; not a measured freezing-point osmometer or a diagnosis.$0.005 $0.007 Base989 ms1 payers100% up
  7. 80api.magentlab.com/api/calc/corrected_sodiumSodium correction for hyperglycemia (Katz 1.6 or Hillier 2.4). formula is required; magent does not pick one silently. Deterministic published correction with citation; not a treatment recommendation.$0.005 $0.007 Base957 ms1 payers100% up
  8. 80api.magentlab.com/api/calc/bicarbonate_deficitBicarbonate deficit from weight and measured HCO3 using Adrogué–Madias 50 percent body-weight space. Deterministic published arithmetic with citation; not a dosing protocol.$0.005 $0.007 Base874 ms1 payers100% up
  9. 80api.magentlab.com/api/calc/rome_iv_child_fecal_incontinenceHyams 2016 Rome IV H3b. rome_iv_child_fecal_incontinence is true iff developmental_age_older_than_4_years, duration_at_least_1_month, defecation_into_places_inappropriate_to_sociocultural_context, no_evidence_of_fecal_retention, and not_explained_by_another_condition. Item 2 is exclusion of fecal retention, not a symptom count. Duration is 1 month. Caller assigns five flags. magent does not examine the child. Not a diagnosis, not H3a functional constipation, not adult Rao 2016 F1.$0.005 $0.007 Base795 ms1 payers100% up
  10. 80api.magentlab.com/api/calc/rome_iv_child_aerophagiaHyams 2016 Rome IV H1d child aerophagia. True iff air swallowing, distention from intraluminal air that increases during the day, repetitive belching and/or increased flatus, not another condition, and 2-month duration. All three symptom criteria required. Not adult belching disorders or infant regurgitation. Caller assigns five flags. magent does not examine the patient. Not a diagnosis.$0.005 $0.007 Base406 ms1 payers100% up
  11. 80api.magentlab.com/api/calc/rome_iv_child_nausea_vomitingHyams 2016 Rome IV H1b. Functional nausea iff 2-month duration plus bothersome_nausea_twice_weekly_not_meal_related, nausea_not_consistently_associated_with_vomiting, and nausea_not_explained_by_another_condition. Functional vomiting iff 2-month duration plus vomiting_at_least_weekly, no_self_induced_eating_disorder_or_rumination, and vomiting_not_explained_by_another_condition. Both may be true. magent does not examine the child. Not a diagnosis, not H1a, CNVS, H1c, or neonate/toddler.$0.005 $0.007 Base692 ms1 payers100% up
  12. 80api.magentlab.com/api/calc/rome_iv_infant_diarrheaBenninga 2016 Rome IV G5 Functional Diarrhea. rome_iv_infant_diarrhea is true iff daily_painless_recurrent_4_or_more_large_unformed_stools, symptoms_last_more_than_4_weeks, onset_between_6_and_60_months, and no_failure_to_thrive_if_caloric_intake_adequate. Rome IV is 4 or more stools (not Rome III's 3). Sleep-stool criterion was dropped and is not a flag. Caller assigns four flags. magent does not examine the child. Not a diagnosis, not adult Rome IV diarrhea, not a malabsorption workup.$0.005 $0.007 Base567 ms1 payers100% up
  13. 80api.magentlab.com/api/calc/rome_iv_infant_constipationBenninga 2016 Rome IV G7. rome_iv_infant_constipation is true iff duration_at_least_1_month and features_met >= 2. features_met always counts five core flags; if toilet_trained also counts incontinence after toileting and stools that may obstruct the toilet. Caller assigns flags including large_fecal_mass_in_rectum. magent does not examine the infant. Not a diagnosis, not adult Rome IV FC, not child H3a.$0.005 $0.007 Base961 ms1 payers100% up
  14. 80api.magentlab.com/api/calc/rome_iv_infant_dyscheziaBenninga 2016 Rome IV G6 infant dyschezia. rome_iv_infant_dyschezia is true iff infant_less_than_9_months, straining_and_crying_at_least_10_minutes_before_soft_stools, and no_other_health_problems. Caller assigns three flags. magent does not examine the infant. Not a diagnosis, not infant functional constipation, not adult Rome IV FC.$0.005 $0.007 Base562 ms1 payers100% up
  15. 80api.magentlab.com/api/calc/rome_iv_infant_colicBenninga 2016 Rome IV G4 infant colic (clinical). rome_iv_infant_colic is true iff the infant is less than 5 months of age when symptoms start and stop, recurrent prolonged crying, fussing, or irritability without obvious cause that caregivers cannot prevent or resolve, and no evidence of failure to thrive, fever, or illness. Research 3-hour/diary criteria are not parsed. Caller assigns three flags. magent does not examine the infant. Not a diagnosis.$0.005 $0.007 Base877 ms1 payers100% up
  16. 80api.magentlab.com/api/calc/rome_iv_infant_regurgitationBenninga 2016 Rome IV G1 infant regurgitation. rome_iv_infant_regurgitation is true iff otherwise_healthy_infant_3_weeks_to_12_months, regurgitation_at_least_twice_daily_for_3_or_more_weeks, and no_retching_hematemesis_aspiration_apnea_ftt_feeding_swallowing_or_abnormal_posturing. magent does not examine the infant. Not a diagnosis, not GERD, not rumination, not child or adolescent Rome IV.$0.005 $0.007 Base877 ms1 payers100% up
  17. 80api.magentlab.com/api/calc/rome_iv_proctalgia_fugaxRao 2016 Rome IV proctalgia fugax (F2c). rome_iv_proctalgia_fugax is true iff recurrent rectal pain unrelated to defecation, episodes seconds to minutes (max 30 min), no anorectal pain between episodes, other causes excluded, last-3-months criteria, and 6-month onset. magent does not examine the rectum. Not a diagnosis, not levator ani, not unspecified functional anorectal pain.$0.005 $0.007 Base718 ms1 payers100% up
  18. 80api.magentlab.com/api/calc/rome_iv_capsKeefer 2016 Rome IV CAPS (formerly FAPS). rome_iv_caps is true iff continuous or nearly continuous abdominal pain, no or only occasional relationship with eating, defecation, or menses, pain limits daily functioning, pain is not feigned, not explained by another GI or medical condition, last-3-months criteria, and 6-month onset. Psychosocial comorbidity is copy-only. magent does not examine or judge feigning beyond the caller flag. Not a diagnosis, not IBS, not narcotic bowel syndrome.$0.005 $0.007 Base548 ms1 payers100% up
  19. 80api.magentlab.com/api/calc/pcdaiHyams 1991 Pediatric Crohn's Disease Activity Index (PCDAI): eleven caller-assigned item points. hematocrit and esr are 0, 2.5, or 5; the other nine are 0, 5, or 10. magent sums only (max 100) and does not return activity bands. magent does not examine the child or assign hematocrit age/sex tables. Not a diagnosis. Not CDAI, SES-CD, or PUCAI.$0.005 $0.007 Base536 ms1 payers100% up
  20. 80api.magentlab.com/api/calc/irae_colitisBrahmer 2018 ASCO Table 2.1 irAE colitis grade from stools_over_baseline (0-40) and four caller-assigned flags. First-match: grade 4 if life_threatening; else 3 if stools >= 7 or incontinence or hospitalization_indicated or limiting_self_care; else 2 if stools >= 4; else 1. Returns icpi_action continue, hold, hold_consider_discontinue_ctla4, or permanently_discontinue. Ostomy-output bands not implemented. magent does not count stools. Not a medical device, not a diagnosis, not a steroid dose.$0.005 $0.007 Base996 ms1 payers100% up
  21. 80api.magentlab.com/api/calc/safeSripongpun 2023 steatosis-associated fibrosis estimator (SAFE) from age, BMI (capped at 40 in the equation), diabetes, AST, ALT, globulin in g/dL, and platelets. Deterministic published equation with citation. Rule-out below 0; rule-in above 100. Not a biopsy, fibrosis stage, FIB-4, NAFLD fibrosis score, or BARD. magent does not compute BMI from height and weight.$0.005 $0.007 Base790 ms1 payers100% up
  22. 80api.magentlab.com/api/calc/hcc_ldCitterio 2016 JAMA Surgery hierarchic classes for liver decompensation after HCC resection from caller-assigned portal_hypertension, major_hepatectomy, and meld (integer 6-40). High if PHT and major (LD 60.0%, liver-related mortality 25.0%). Low if no PHT, minor, and MELD ≤ 9 (LD 4.9%, mortality 4.4%). Else intermediate (LD 28.6%, mortality 9.0%). magent does not compute MELD or HVPG. Not a surgical indication, transplant listing, or medical device.$0.005 $0.007 Base656 ms1 payers100% up
  23. 80api.magentlab.com/api/calc/kings_collegeKing's College criteria (O'Grady 1989) for poor prognosis in fulminant hepatic failure. Acetaminophen: arterial pH <7.30, or PT >100 s plus creatinine >300 umol/L plus grade III/IV encephalopathy. Non-acetaminophen: PT >100 s, or any 3 of age <11 or >40, unfavorable etiology (non-A non-B or drug reaction), jaundice-to-encephalopathy >7 days, bilirubin >300 umol/L, PT >50 s. PT seconds, not INR. Not a transplant listing order.$0.005 $0.007 Base723 ms1 payers100% up
  24. 80api.magentlab.com/api/calc/simplified_aihHennes 2008 simplified AIH (Table 2): caller-assigned autoantibody points 0-2 (max 2 across ANA/SMA/LKM/SLA), IgG points 0-2 (≤ULN / >ULN / >1.10×ULN), histology none 0 / compatible 1 / typical 2, viral hepatitis absent true 2. Max 8. Score <6 not_aih, 6 probable, ≥7 definite. Not a diagnosis and not the original 1999 IAHG score. magent does not titer autoantibodies, assay IgG vs ULN, or read liver histology.$0.005 $0.007 Base593 ms1 payers100% up
  25. 80api.magentlab.com/api/calc/clif_c_aclfJalan 2014 CLIF-C ACLF (CANONIC) from caller-assigned CLIF-C OF (integer 6-18), age, and WBC in 10^9/L. Score = 10 × (0.33 × CLIF-C OF + 0.04 × age + 0.63 × ln(WBC) − 2), rounded to 1 decimal then clamped 0-100. magent does not score the six organs or compute CLIF-C OF. Not MELD, MELD-Na, Child-Pugh, CLIF-SOFA, or a transplant listing protocol. Not a medical device.$0.005 $0.007 Base883 ms1 payers100% up
  26. 80api.magentlab.com/api/calc/evendoDong 2019 EVendo score for screening high-risk esophageal varices. A = (8.5 * INR) + (AST/35); B = (platelets/150) + (BUN/20) + (hemoglobin/15); score = A/B + 1 if ascites. US conventional units. Round to 2 decimals. Published cutoff strictly below 3.90. magent clamps: INR 0.8-4.0, AST 5-4000 U/L, platelets 10-800 k/uL, BUN 2-150 mg/dL, hemoglobin 4-20 g/dL. Not a varices diagnosis or endoscopy order. magent does not assay labs. Not a medical device.$0.005 $0.007 Base511 ms1 payers100% up
  27. 80api.magentlab.com/api/calc/t_macsBody 2016 T-MACS logistic ACS probability from caller-assigned ECG ischaemia, worsening angina, right-arm radiation, vomiting, observed sweating, hypotension (SBP <100), and Roche Elecsys hs-cTnT ng/L. Uses that paper's rounded coefficients. Bands p<0.02 very_low, 0.02<=p<0.05 low, 0.05<=p<0.95 moderate, p>=0.95 high. magent does not interpret ECG or assay troponin. Not original MACS, HEART, EDACS, or Vancouver. Not a diagnosis or medical device.$0.005 $0.007 Base603 ms1 payers100% up
  28. 80api.magentlab.com/api/calc/timi_stemiTIMI risk score for ST-elevation MI from age, diabetes/hypertension/angina, systolic BP, heart rate, Killip class, weight, anterior STE or LBBB, and time to treatment. Returns a 0-14 point total with components. Deterministic published score with citation; not a reperfusion or fibrinolytic protocol.$0.005 $0.007 Base721 ms1 payers100% up
  29. 80api.magentlab.com/api/calc/doac_scoreAggarwal 2023 DOAC Score (Circulation Table 2) for AF on DOACs: age 65-69 2 / 70-74 3 / 75-79 4 / >=80 5 (<65 0); CrCl/eGFR 30-60 inclusive 1, <30 2; underweight caller BMI <18.5 flag 1; stroke/TIA/embolism 1; diabetes 1; hypertension 1; antiplatelet none 0, aspirin 2, dual 3; NSAID 1; bleeding history 3; liver disease 2. Score min(raw, 10). Bands 0-3 very_low, 4-5 low, 6-7 moderate, 8-9 high, 10 very_high. Not HAS-BLED. Not DOAC dosing. Not warfarin.$0.005 $0.007 Base771 ms1 payers100% up
  30. 80api.magentlab.com/api/calc/atriaFang 2011 ATRIA hemorrhage score: anemia caller flag 3 (paper Hb <13 g/dL men or <12 g/dL women); severe renal disease (eGFR <30 or dialysis) caller flag 3; age >=75 scores 2; prior hemorrhage 1; diagnosed hypertension 1. Max 10. Score 0-3 low, 4 intermediate, 5-10 high. Not a diagnosis. Not a warfarin order. Not HAS-BLED. magent does not measure hemoglobin or compute eGFR.$0.005 $0.007 Base763 ms1 payers100% up
  31. 80api.magentlab.com/api/calc/chads2CHADS2 score from discrete clinical flags. Use for the 2001 Gage atrial-fibrillation stroke-risk arithmetic. Deterministic published score with citation; not an anticoagulation order.$0.005 $0.007 Base908 ms1 payers100% up
  32. 80api.magentlab.com/api/calc/orbitORBIT 2015 (O'Brien) AF bleeding score: age >=75 scores 1; anemia caller flag 2; bleeding history 2; insufficient kidney (paper eGFR <60) caller flag 1; antiplatelet 1. Max 7. Score 0-2 low, 3 intermediate, >=4 high. Not a diagnosis. Not HAS-BLED. magent does not take hemoglobin or compute eGFR.$0.005 $0.007 Base440 ms1 payers100% up
  33. 80api.magentlab.com/api/calc/cha2ds2_vaESC 2024 CHA2DS2-VA stroke-risk score from age and discrete flags (CHF, hypertension, diabetes, prior stroke/TIA, vascular disease). No sex category (not CHA2DS2-VASc). Score 0 none, 1 consider OAC, ≥2 OAC recommended. Deterministic published arithmetic with citation; not an anticoagulation order.$0.005 $0.007 Base904 ms1 payers100% up
  34. 80api.magentlab.com/api/calc/ttkgTranstubular potassium gradient (TTKG) from plasma potassium, urine potassium, plasma osmolality, and urine osmolality (Ethier JH et al., Am J Kidney Dis 1990). TTKG = (urine_k / potassium) / (urine_osm / plasma_osm), 1 decimal. Not valid when urine osmolality is not greater than plasma osmolality (water diuresis). Numeric TTKG only; not a potassium-disorder diagnosis or medical device.$0.005 $0.007 Base477 ms1 payers100% up
  35. 80api.magentlab.com/api/calc/schwartz_gfrSchwartz 2009 bedside eGFR for children with CKD (CKiD): 0.413 × height in cm divided by serum creatinine in mg/dL, rounded to one decimal as mL/min/1.73m2. Height may be centimeters or inches; creatinine may be mg/dL or µmol/L. Not a dosing recommendation, not CKD-EPI, not Cockcroft–Gault, and not the 1976 Schwartz k=0.55 formula. Does not assign CKD stages.$0.005 $0.007 Base915 ms1 payers100% up
  36. 80api.magentlab.com/api/calc/leibovich_2018Leibovich 2018 histology-specific RCC models after surgery. Required histology clear_cell, papillary, or chromophobe. ccRCC PFS points (2010 TNM): t1a/t1b/t2a 0, t2b 2, t3a-t3c 3, t4 4; nx/n0 0, n1 2; size ≥10 cm 1; grade 1-2 0, 3 1, 4 3; necrosis 2; max 12; risk low 0-2, intermediate 3-5, high ≥6. Papillary and chromophobe return the 2018 three PFS groups (score 0-2). Not SSIGN. Not Leibovich 2003. magent does not stage or read pathology. Not a diagnosis. Not a medical device.$0.005 $0.007 Base961 ms1 payers100% up
  37. 80api.magentlab.com/api/calc/stone_nephrolithometryOkhunov 2013 STONE nephrolithometry for kidney calculi (PCNL). Caller-assigned published item points: size 0_399 1 / 400_799 2 / 800_1599 3 / ge_1600 4 (mm²); tract le_100 1 / gt_100 2 (skin-to-stone mm); obstruction none_or_mild 1 / moderate_or_severe 2 (hydronephrosis); calyces 1_or_2 1 / 3 2 / staghorn 3; essence le_950 1 / gt_950 2 (HU). Sum 5-13. No published SFR bands. Not the Moore 2014 ureteral STONE score. magent does not measure CT. Not a medical device. Not a PCNL order.$0.005 $0.007 Base350 ms1 payers100% up
  38. 80api.magentlab.com/api/calc/ain_riskMoledina 2022 development-model logistic probability of biopsy-proven acute interstitial nephritis from serum creatinine, BUN:creatinine ratio, urine dipstick specific gravity, and dipstick protein (0 or 1+ versus 2+ or higher, caller-assigned). Returns logit and estimated_probability_percent. Not a medical device, not a diagnosis, and not a kidney biopsy. Does not include urine IL-9 or TNF-α. Moledina 2022 publishes no named low/high cutoff.$0.005 $0.007 Base846 ms1 payers100% up
  39. 80api.magentlab.com/api/calc/kfreTangri 2011 4-variable Kidney Failure Risk Equation: 2- and 5-year risk of dialysis or transplant from age, male, eGFR, and urine ACR (mg/g). Risk = 1 - S0^exp(LP) with that paper's 4-variable coefficients. Caller supplies eGFR; magent does not compute CKD-EPI or assay ACR. Not the 8-variable model, not Tangri 2016 country S0, no race. Not a dialysis or transplant order. Not a medical device.$0.005 $0.007 Base800 ms1 payers100% up
  40. 80api.magentlab.com/api/calc/egfr_ckd_epiCited race-free CKD-EPI 2021 creatinine eGFR. Agents must not invent eGFR from model memory; pay per request with x402 USDC on Base. Deterministic published formula with citation. Not a treatment recommendation.$0.005 $0.007 Base723 ms1 payers100% up
  41. 80api.magentlab.com/api/calc/macochaDe Jong 2013 MACOCHA from seven caller-assigned flags: Mallampati III or IV (5), OSA (2), reduced cervical mobility (1), mouth opening <3 cm (1), coma (1), SpO2 <80% (1), non-anesthesiologist (1). Total 0-12 (0 easy, 12 very difficult); high_risk at >=3. Not an intubation order. magent does not examine the airway, compute GCS, or measure SpO2.$0.005 $0.007 Base717 ms1 payers100% up
  42. 80api.magentlab.com/api/calc/brescia_covidDuca 2020 Brescia-COVID Respiratory Severity Scale testing-criteria count: four caller-assigned binaries (wheezing or inability to speak in full sentences at rest or with minimal effort; respiratory rate >22; PaO2 <65 mmHg or SpO2 <90%; significant worsening on chest radiograph). bcrss is the count of positives (0–4). magent does not examine the patient or read imaging. Not a COVID-19 diagnosis, ventilator order, or medical device. Not the 0–8 NIV/intubation/proning ladder.$0.005 $0.007 Base716 ms1 payers100% up
  43. 80api.magentlab.com/api/calc/berlin_ardsBerlin Definition of ARDS (Ranieri 2012). berlin_ards iff clinical box (onset within 1 week, bilateral opacities not fully explained, origin not fully HF or fluid) and severity mild, moderate, or severe. Severe: PF<=100 with PEEP>=5. Moderate: 100<PF<=200 with PEEP>=5. Mild: 200<PF<=300 with PEEP or CPAP>=5. Caller assigns flags and pf_ratio. magent does not read radiographs or echo, diagnose ARDS, or set ventilator mode. Not AECC 1994, not Kigali, not the oxygenation index.$0.005 $0.007 Base445 ms1 payers100% up
  44. 80api.magentlab.com/api/calc/asthma_apiAsthma Predictive Index (Castro-Rodriguez 2000, Tucson Children's Respiratory Study). Stringent positive if early frequent wheeze (parent frequency scale > 3) plus 1+ major or 2+ minor criteria. Loose positive if any early wheeze plus the same risk factors. Majors: parental MD asthma, MD eczema. Minors: MD allergic rhinitis, wheezing apart from colds, circulating eosinophils >4% of WBC (caller-assigned). Not mAPI. Not an asthma diagnosis. magent does not examine the child. Not a medical device.$0.005 $0.007 Base569 ms1 payers100% up
  45. 80api.magentlab.com/api/calc/pramChalut 2000 Preschool Respiratory Assessment Measure (PRAM): five caller-assigned items — oxygen_sat_points (0/1/2), suprasternal retractions (0/2), scalene contraction (0/2), air_entry (0-3), and wheezing (0-3). magent sums only (max 12) and does not auscultate or measure saturation. Score only; no invented mild/moderate/severe bands. Not a diagnosis and not the Westley 1978 croup score.$0.005 $0.007 Base536 ms1 payers100% up
  46. 80api.magentlab.com/api/calc/hacorDuan 2017 HACOR (ESM Table 2): HR ≤120 → 0, ≥121 → 1; pH ≥7.35 → 0, 7.30–7.34 → 2, 7.25–7.29 → 3, <7.25 → 4; GCS 15 → 0, 13–14 → 2, 11–12 → 5, ≤10 → 10; P/F ≥201 → 0, 176–200 → 2, 151–175 → 3, 126–150 → 4, 101–125 → 5, ≤100 → 6; RR ≤30 → 0, 31–35 → 1, 36–40 → 2, 41–45 → 3, ≥46 → 4. Max 25. Low ≤5, high >5. Not an intubation or NIV-failure order. magent does not read an ABG, GCS the patient, or a ventilator.$0.005 $0.007 Base521 ms1 payers100% up
  47. 80api.magentlab.com/api/calc/mmrcMahler 1988 modified Medical Research Council (mMRC) dyspnea grade 0-4 as assigned by the caller. Returns the grade, score (same as grade), max 4, and published wording (breathless only with strenuous exercise through too breathless to leave the house or breathless when dressing). Not GOLD ABE groups, not a BODE index, and not Bestall MRC grades 1-5. magent does not examine the patient.$0.005 $0.007 Base527 ms1 payers100% up
  48. 80api.magentlab.com/api/calc/bodeCelli 2004 BODE index from BMI (≤21 → 1), FEV1 % predicted (0–3), MMRC dyspnea (0–3), and 6-minute walk in meters (0–3). Returns a 0–10 total and quartile 1–4 (0–2 / 3–4 / 5–6 / 7–10). Deterministic published points with citation. Not a GOLD stage and not a transplant listing.$0.005 $0.007 Base528 ms1 payers100% up
  49. 80api.magentlab.com/api/calc/6mwdEnright 1998 predicted six-minute walk distance (meters) from sex, age 40-80, height_cm, and weight_kg (Table 3 height/weight: male 7.57H−5.02age−1.76W−309; female 2.11H−2.29W−5.78age+667). Reports predicted_m and lln_m (minus 153 m men or 139 m women). Optional walked_m (0-1500) yields percent_predicted. Not a timed walk, BMI-equation path, or 80%/400 m class. Not a medical device.$0.005 $0.007 Base960 ms1 payers100% up
  50. 80api.magentlab.com/api/calc/peak_expiratory_flowNunn and Gregg 1989 predicted adult peak expiratory flow (L/min) from age, sex, and height. Sex-specific ln(PEF) regressions as published. Deterministic published arithmetic with citation; not a personal-best or action-plan zone.$0.005 $0.007 Base859 ms1 payers100% up
  51. 80api.magentlab.com/api/calc/fleischner_2017MacMahon 2017 Fleischner table for one solid noncalcified incidental nodule. size_mm 1-30 and caller-assigned high_risk. <6 mm: no routine follow-up (optional CT at 12 months if high risk). 6-8 mm: CT at 6-12 months, then consider or obtain 18-24 month CT by risk. >8 mm: consider CT at 3 months, PET/CT, or tissue sampling. Not subsolid, multiple, or Lung-RADS screening. magent does not read CT. Not a diagnosis or medical device.$0.005 $0.007 Base964 ms1 payers100% up
  52. 80api.magentlab.com/api/calc/sf_ratioSpO2/FiO2 (S/F) ratio as pulse-oximetry SpO2 percent divided by inspired oxygen as a fraction (0.21–1.0) (Rice 2007). Returns the ratio rounded to one decimal. Magent does not apply ARDS or Berlin bands. This is not the PaO2/FiO2 (P/F) ratio and not the ROX index.$0.005 $0.007 Base883 ms1 payers100% up
  53. 80api.magentlab.com/api/calc/roxROX index as (SpO2 percent / FiO2) / respiratory rate in breaths/min (Roca 2016). Returns the index rounded to two decimals. Not a ventilation order. This is not the PaO2/FiO2 (P/F) ratio and not RSBI (respiratory rate / tidal volume).$0.005 $0.007 Base964 ms1 payers100% up
  54. 80api.magentlab.com/api/calc/murrayMurray 1988 lung injury score (LIS): mean of four 0–4 components (caller-assigned CXR quadrants; PaO2/FiO2 ≥300→0, 225–299→1, 175–224→2, 100–174→3, <100→4; PEEP cm H2O ≤5→0, 6–8→1, 9–11→2, 12–14→3, ≥15→4; compliance mL/cm H2O ≥80→0, 60–79→1, 40–59→2, 20–39→3, ≤19→4). LIS 0 none, 0<LIS≤2.5 mild_moderate, >2.5 severe. Not a medical device, not a Berlin ARDS diagnosis, not a ventilator order. magent does not interpret imaging.$0.005 $0.007 Base999 ms1 payers100% up
  55. 80api.magentlab.com/api/calc/pf_ratioPaO2/FiO2 ratio as arterial PO2 in mm Hg divided by inspired oxygen as a fraction (0.21–1.0). Returns the ratio rounded to one decimal. Magent does not apply ARDS severity cutoffs, and this is not the oxygenation index (FiO2 × MAP × 100 / PaO2).$0.005 $0.007 Base835 ms1 payers100% up
  56. 80api.magentlab.com/api/calc/oxygenation_indexOxygenation index from FiO2 as a fraction (0.21–1.0), mean airway pressure in cm H2O, and PaO2: FiO2 × MAP × 100 / PaO2. Deterministic published arithmetic with citation; not a diagnosis or an ECMO-initiation protocol.$0.005 $0.007 Base960 ms1 payers100% up
  57. 80api.magentlab.com/api/calc/aa_gradientAlveolar–arterial oxygen gradient from FiO2, barometric pressure, PaCO2, PaO2, and RQ using the simplified alveolar-gas equation (PH2O 47 mm Hg). Deterministic published arithmetic with citation; not a diagnosis.$0.005 $0.007 Base961 ms1 payers100% up
  58. 80api.magentlab.com/api/calc/hcm_risk_scdO'Mahony 2014 HCM Risk-SCD: 5-year SCD probability from wall thickness, LA diameter, LVOT gradient, family history of SCD, NSVT, unexplained syncope, and age. Returns prognostic_index, five_year_scd_risk_percent, and 4%/6% risk_band (lower / intermediate / higher). Not an ICD or device order. Not a medical device.$0.005 $0.007 Base760 ms1 payers100% up
  59. 80api.magentlab.com/api/calc/saveSchmidt 2015 SAVE-score from Table 4 integer cells plus constant −6. Age, weight, additive diagnoses, chronic renal failure, acute liver/CNS/renal failure, intubation hours, PIP ≤20, cardiac arrest, diastolic BP ≥40, pulse pressure ≤20, bicarbonate ≤15. Class I–V hospital survival 75/58/42/30/18%. Range −35 to 17. Not a VA-ECMO assignment. Not modified SAVE.$0.005 $0.007 Base995 ms1 payers100% up
  60. 80api.magentlab.com/api/calc/steinhartSteinhart 2009 Equation 1 probability of acute heart failure from caller-assigned age, clinician pretest probability (fraction 0-1 or 0-100 percent), and NT-proBNP in pg/mL. Returns estimated_probability_percent from the unrounded probability plus published ≤0.20 rule-out and ≥0.80 rule-in flags. Not a diagnosis, diuretic, or admission order. magent does not assay NT-proBNP.$0.005 $0.007 Base908 ms1 payers100% up
  61. 80api.magentlab.com/api/calc/papiKorabathina 2012 pulmonary artery pulsatility index from PA systolic (mm Hg), PA diastolic (mm Hg), and RAP (mm Hg): PAPi = (PAS − PAD) / RAP. Returns papi to two decimals and the paper ROC band (<=0.9 or >0.9) from the unrounded ratio. Equality at 0.9 is <=0.9. RAP 0 is invalid (no RAP=1 substitution). Not a medical device, RV-failure diagnosis, or device threshold.$0.005 $0.007 Base878 ms1 payers100% up
  62. 80api.magentlab.com/api/calc/dsiDiastolic shock index as heart rate in bpm divided by cuff diastolic pressure in mm Hg (Ospina-Tascón 2020). Returns the ratio rounded to two decimals. Not a shock diagnosis, treatment target, or cutoff. Distinct from Allgöwer–Burri HR/SBP shock index. The 2020 cohort had no normal-subject control group, so a DSI cutoff to identify abnormality could be misleading.$0.005 $0.007 Base832 ms1 payers100% up
  63. 80api.magentlab.com/api/calc/cpoFincke 2004 cardiac power output from MAP (mm Hg) and cardiac output (L/min): CPO = MAP × CO / 451. Returns cpo_watts to two decimals and the paper ROC band (<=0.53 or >0.53) from the unrounded value. Equality at 0.53 W is <=0.53. MAP is caller-supplied (Fincke used diastolic + (systolic−diastolic)/3); this tool does not take SBP/DBP or compute cardiac power index. Not a medical device, shock diagnosis, or treatment target.$0.005 $0.007 Base806 ms1 payers100% up
  64. 80api.magentlab.com/api/calc/shock_indexShock index as heart rate in bpm divided by cuff systolic pressure in mm Hg (Allgöwer and Burri 1967). Returns the original ratio rounded to two decimals. Not a shock diagnosis, treatment target, or cutoff, and does not use MAP or diastolic pressure.$0.005 $0.007 Base868 ms1 payers100% up
  65. 80api.magentlab.com/api/calc/iv_dripINS gravity drip rate: gtt/min = (volume_ml × drop_factor_gtt_ml) / time_min, rounded half away from zero to an integer. Drop factor 10, 15, or 20 gtt/mL macrodrip or 60 gtt/mL microdrip. Also reports mL/hour. Not a pump program, drug order, or device. Deterministic published arithmetic with citation.$0.005 $0.007 Base995 ms1 payers100% up
  66. 80api.magentlab.com/api/calc/nadlerNadler 1962 predicted blood volume in liters from height, weight, and sex (separate male and female equations). Deterministic published arithmetic with citation. For adults as published; this tool does not take age. Not a transfusion order, Lemmens–Bernstein–Brodsky estimate, or 70 mL/kg rule of thumb.$0.005 $0.007 Base727 ms1 payers100% up
  67. 80api.magentlab.com/api/calc/bsa_mostellerCited Mosteller body surface area. Agents must not invent BSA from model memory; pay per request with x402 USDC on Base. Deterministic published formula with citation. Not a treatment recommendation.$0.005 $0.007 Base722 ms1 payers100% up
  68. 80api.magentlab.com/api/calc/bmiBody-mass index from height and weight (Keys/Quetelet). Use for GLP-1 and bariatric prior-auth arithmetic. Deterministic published index with citation; not a diagnosis.$0.005 $0.007 Base698 ms1 payers100% up
  69. 80twitr.sh/api/tools/composeDraft tweets with AI: generate variants from a topic and goal, refine an existing draft, or score a draft for likely engagement — with tone, call-to-action, and style-matching options. Flat sub-cent price per step.$0.001 $0.0024 Base486 ms1 payers100% up
  70. 80prediction-bot-iggf.onrender.com/sentimentSentiment score for a Polymarket or Kalshi market question$0.05 $0.35 Base727 ms1 payers100% up
  71. 80btcnode.uk/api/feesLive fee rates (high/medium/low sat/vB) — flat $0.001 per call, USDC on Base, no signup.$0.003 $0.001 Base989 ms1 payers100% up
  72. 80x402-market-intel-mcp.mtree.workers.dev/v1/x402/seller_scoreScore a payTo wallet, domain, or resource for observed revenue proof, buyer breadth, metadata quality, registry coverage, and route reliability. Price 0.05 USDC on Base via x402. Free preview: https://x402-market-intel-mcp.mtree.workers.dev/preview/seller_score?source=x402_manifest. Demo: https://x402-market-intel-mcp.mtree.workers.dev/demo/seller_score. Contact: https://x402-market-intel-mcp.mtree.workers.dev/contact.$0.10 $0.05 Base867 ms1 payers100% up
  73. 80the-stall.intuitek.ai/cap/vision-analyzeAnalyze any image URL using GPT-4o-mini vision. Returns structured analysis based on the mode: describe (full description), ocr (text extraction), chart (data/trend extraction), ui (interface analysis), identify (object/subject ID), or qa (answer a specific question about the image). Input must be a publicly accessible image URL (JPEG, PNG, GIF, WebP). $0.050/call.$0.261 $0.05 Base705 ms1 payers100% up
  74. 80agenticfinancegraph.com/check/livenessLiveness card: L0–L9 rank with the evidence behind it: bindings, first and last observed payment, float, delegation. No raw keys. About one ERC-8004 agent on Base, by Agentic Finance Graph. id = token id, slug or bound wallet; an agent never seen paying is a 404 before any payment.$1.00 $0.01 Base928 ms1 payers100% up
  75. 80btcnode.uk/api/whalesWhale monitor: mempool transfers over 50 BTC — flat $0.001 per call, USDC on Base, no signup.$0.005 $0.001 Base632 ms1 payers100% up
  76. 80mcpfax-intel.bowling-anthony.workers.dev/moversSudden inflow spikes and first-seen large payers, before they show up in a ranking.$0.003 $0.01 Base373 ms1 payers100% up
  77. 80base.mapleai.shop/api/v1/chat/completionsCreate chat completion (agent alias)$0.01 $0.001 Base517 ms1 payers100% up
  78. 80base.mapleai.shop/prepaid/codesBuy a prepaid GPT API code$0.001 $0.008 Base450 ms1 payers100% up
  79. 80api.seerium.xyz/v1/pro/screenerPolymarket API and prediction market pro screener for agents. Ranks setups by score, confidence, liquidity, spread, volume, momentum, and mispricing.$0.001 $0.10 Base682 ms1 payers100% up
  80. 80api.seerium.xyz/v1/meme-radar/quality-volumePump.fun and Pump Fun Solana meme coin quality-volume API for agents. Ranks high-velocity tokens with liquidity, short-window volume, and meme scores.$0.001 $0.10 Base643 ms1 payers100% up
  81. 80api.seerium.xyz/v1/meme-radar/fresh-launchesPump.fun and Pump Fun Solana meme coin radar API for agents. Returns fresh-launch tokens with early traction, liquidity, short-window volume, and meme scores.$0.001 $0.10 Base604 ms1 payers100% up
  82. 80api.seerium.xyz/v1/prediction/whale-radar/randomizedPolymarket whale trades API and whale radar sample for agents. Returns current tracked wallet moves for discovery and monitoring.$0.001 $0.10 Base564 ms1 payers100% up
  83. 80api.seerium.xyz/v1/prediction/buildersPolymarket API for builder stats. Ranks prediction market creators by volume, active users, verification, and period comparisons.$0.001 $0.10 Base517 ms1 payers100% up
  84. 80api.seerium.xyz/v1/pulse/catalystsNews prediction market catalyst API for agents. Ranks prediction market signals by freshness, confidence, urgency, liquidity, and probability context.$0.001 $0.10 Base519 ms1 payers100% up
  85. 80api.seerium.xyz/v1/pulse/news-market-linksNews prediction market API and crypto news feed for agents. Matches global headlines to Polymarket questions, catalysts, and market context.$0.001 $0.10 Base439 ms1 payers100% up
  86. 80api.seerium.xyz/v1/pulse/weather-marketsWeather prediction market API for agents. Pairs NOAA weather context with related Polymarket market signals and event markets.$0.001 $0.10 Base433 ms1 payers100% up
  87. 80api.seerium.xyz/v1/dex/funding-heatCrypto perpetual funding rate API, perp funding heatmap, and Dex funding heat feed for agents. Ranks active crypto Dex symbols by current funding pressure, crowded longs, crowded shorts, funding bps, severity, heat score, price move, volume, short squeeze risk, long squeeze risk, and reversal monitoring.$0.001 $0.10 Base383 ms1 payers100% up
  88. 80api.seerium.xyz/v1/dex/orderbook-pressureCrypto order book API and Dex orderbook pressure feed for agents. Returns bid/ask depth imbalance, buy-side or sell-side pressure, microprice bias, spread in bps, notional liquidity, funding, and confidence for active crypto Dex symbols.$0.001 $0.10 Base349 ms1 payers100% up
  89. 80api.seerium.xyz/v1/dex/scanCrypto market signals API for Dex market data, order books, funding, momentum, and trading opportunities.$0.001 $0.10 Base337 ms1 payers100% up
  90. 80api.seerium.xyz/v1/prediction/arb/same-outcome-spreadPrediction market arbitrage and same-outcome spread API for Polymarket, Kalshi, and Gemini. Finds YES or NO price gaps across venues.$0.001 $0.10 Base321 ms1 payers100% up
  91. 80api.seerium.xyz/v1/prediction/arb/full-coverPrediction market arbitrage API for Polymarket, Kalshi, and Gemini. Finds full-cover YES plus NO combinations with positive net edge.$0.001 $0.10 Base347 ms1 payers100% up
  92. 80api.seerium.xyz/v1/prediction/cross-venue-disagreementCross-venue prediction market disagreement API for Polymarket, Kalshi, and Gemini. Finds active related markets where venues price the same YES or NO outcome differently, with match confidence, price gap, liquidity, volume, and market identifiers.$0.001 $0.10 Base312 ms1 payers100% up
  93. 80business-frameworks.matryoshka-paradigms.workers.dev/apply/risk/decide/hurdleBusiness Frameworks — Set the hurdle rate, applied to the caller's own numbers. Send the long-bond yield and two or three asset betas; get r for this business, with the sub-$5M and concentration rules applied. Deterministic (the node's rule, no model); returns the worked decision plus the node text and its public citations. Schema at GET /apply/risk/decide/hurdle.$0.01 $0.05 Base994 ms1 payers100% up
  94. 80business-frameworks.matryoshka-paradigms.workers.dev/node/value/whyBusiness Frameworks business-frameworks/value/why@1.0 — Why value is the objective, and what moves it. Call when an agent needs the operating logic behind value before using the scale bands and decision rules below it. Returns 350 tokens of original synthesis with public citations and child handles; free layer at /catalogue.$0.01 $0.02 Base940 ms1 payers100% up
  95. 80simfuse.app/x402/purchase/01kvmtd8nmt5bvxhze6qan12kmIndonesia 500 MB: a prepaid travel eSIM with 500 MB of data for 1 day. Buy it when a traveller needs mobile data abroad without a local SIM card or roaming fees. Pay in USDC on Base with x402, no account or API key needed. The installable eSIM (QR code, LPA activation code, one-tap iPhone and Android links) is ready within seconds from order_status_url. Optional JSON body: quantity (1 to 20) and email.$1.69 $1.59 Base457 ms1 payers100% up
  96. 80simfuse.app/x402/purchase/01kvmtdbybqar2qewyaf9wzf1kUnited States 500 MB: a prepaid travel eSIM with 500 MB of data for 1 day. Buy it when a traveller needs mobile data abroad without a local SIM card or roaming fees. Pay in USDC on Base with x402, no account or API key needed. The installable eSIM (QR code, LPA activation code, one-tap iPhone and Android links) is ready within seconds from order_status_url. Optional JSON body: quantity (1 to 20) and email.$1.59 $1.49 Base444 ms1 payers100% up
  97. 80simfuse.app/x402/purchase/01kvmtd8akcc65w825ekzv50afGreece 500 MB: a prepaid travel eSIM with 500 MB of data for 1 day. Buy it when a traveller needs mobile data abroad without a local SIM card or roaming fees. Pay in USDC on Base with x402, no account or API key needed. The installable eSIM (QR code, LPA activation code, one-tap iPhone and Android links) is ready within seconds from order_status_url. Optional JSON body: quantity (1 to 20) and email.$1.29 $1.19 Base443 ms1 payers100% up
  98. 80simfuse.app/x402/purchase/01kvmtd8y8a1zbp8pbqjkc795bItaly 500 MB: a prepaid travel eSIM with 500 MB of data for 1 day. Buy it when a traveller needs mobile data abroad without a local SIM card or roaming fees. Pay in USDC on Base with x402, no account or API key needed. The installable eSIM (QR code, LPA activation code, one-tap iPhone and Android links) is ready within seconds from order_status_url. Optional JSON body: quantity (1 to 20) and email.$1.29 $1.19 Base415 ms1 payers100% up
  99. 80simfuse.app/x402/purchase/01kvmtdb8pnrtd897vwkxht597Spain 500 MB: a prepaid travel eSIM with 500 MB of data for 1 day. Buy it when a traveller needs mobile data abroad without a local SIM card or roaming fees. Pay in USDC on Base with x402, no account or API key needed. The installable eSIM (QR code, LPA activation code, one-tap iPhone and Android links) is ready within seconds from order_status_url. Optional JSON body: quantity (1 to 20) and email.$1.29 $1.19 Base444 ms1 payers100% up
  100. 80spawnxchange.com/api/v1/items/:uuid/acquireBuy the selected AI-generated code artifact. Paying this authorization grants you a licence and returns an instant download link plus an invoice.$1.00 $0.001 Base613 ms1 payers100% up