x402watch

50,402 paid endpoints are listed. 27,744 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 2026-10-10 12:50 UTC · 50,402 probed

27,744 answering 40218,331 down3,404 rejecting923 no paywall1,677 price drift
  1. 80ozmium.org/v1/signalsEXPERIMENTAL / WIP- an early, unproven BUY/SELL signal feed (no established out-of-sample edge, not advice); corroborate with news + cross-asset context before acting. Full details: GET /v1.$0.001 Base1563 ms4 payers83% up
  2. 80http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/domain/mail-preflightMX/SPF/DMARC preflight; not mailbox verification. Base mainnet USDC$0.002 Base159 ms4 payers67% up
  3. 80api.nohumans.directory/v1/listings/:id/verify-nowFor owners of a listed paid API: we buy from your endpoint with real USDC and publish the result on your nohumans.directory listing, whatever it finds. Plan "single": one purchase within 24 hours. Money decides when we buy, never the outcome, score or rank. Send your claim token as x-claim-token. Fee $3.00; this listing quotes $0.5000/call. Other plan: ?plan=pack ($5, three purchases in 30 days). Rule: https://nohumans.directory/methodology#verify-now$3.00 $2.00 Base564 ms4 payers100% up
  4. 80api.magentlab.com/api/calc/canriskRobinson 2011 Table 3 pCANRISK (not eCANRISK). Age 0/7/13/15; male 6; BMI 0/4/9/14; waist 0/4/6 by sex; inactivity 1; no daily fruit/veg 2; high BP 4; high glucose 14; macrosomia 1 (women); family first-degree categories ×2; caller-assigned ethnicity White 0 Aboriginal 3 Black 5 East Asian 10 South Asian 11; education 5/1/0. Max 81 F/86 M. Cutoffs 21, 29, 32, 33, 43. Not a diagnosis.$0.005 $0.007 Base343 ms4 payers100% up
  5. 80defi.hugen.tokyo/defi/chainsList all blockchain networks supported by this API's security scanning — Ethereum, BSC, Polygon, Arbitrum, Base, Optimism, Avalanche, Fantom, Solana, and 20+ chains with chain IDs and names. Accepts USDC payments on Base and Solana$0.005 $0.01 Base648 ms4 payers100% up
  6. 80vape-x402.vapex402.workers.dev/data/dex_volumesVAPE dex_volumes — DEX trading volume on a chain by venue, each with its logo (default Base) — real trading activity across the chain's exchanges.$0.01 Base2005 ms3 payers83% up
  7. 80vape-x402.vapex402.workers.dev/data/treasuryVAPE treasury — A protocol's on-chain treasury composition — total USD, own-token USD, and the own-token share (a treasury that's ~all its own token is a fragility signal).$0.01 Base1029 ms3 payers83% up
  8. 80toolcall.click/t/time/holidaysPublic holidays for any country and year, plus optional business-day checking. Pass country= (ISO alpha-2) and year=; add date= to learn whether that day is a business day, whether it is a weekend or public holiday, the holiday name, and the next business day. Covers 100+ countries. JSON response. $0.01 USDC per call, pay via x402, no API key.$0.01 Base1058 ms3 payers83% up
  9. 80http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/preflightRead-only MCP handshake/tools-list preflight; no destructive tool calls. Base mainnet USDC$0.004 Base286 ms3 payers67% up
  10. 80x402.agentindex.world/llm/claude-sonnetllm/claude-sonnet$0.0113 $0.0019 Base366 ms3 payers100% up
  11. 80402.com.tr/api/x402/vat-checkValidate an EU VAT number offline: country prefix, national format, and the published check-digit algorithm for the 8 countries that have one (BE, DE, FR, IT, LU, NL, PL, PT). The response says which of the two you got — checksumChecked distinguishes a verified number from a format-only pass, because they are not the same strength of answer. Registration is deliberately NOT claimed: only VIES can say whether a number is registered, and this endpoint does not call it.$0.002 Base348 ms3 payers75% up
  12. 80api.magentlab.com/api/calc/rhigACOG Practice Bulletin 181 RhD immune globulin vial arithmetic. fmh_ml = fetal_cells_percent/100 * maternal_blood_volume_ml. One 300 microgram vial covers 30 mL Rh D-positive fetal whole blood. AABB Technical Manual rounding: if frac(fmh_ml/30) >= 0.5 round up then add one vial; if < 0.5 round down then add one. Minimum 1 vial. Caller assigns Kleihauer–Betke percent and maternal volume; magent does not read slides. Not a prescription or brand order.$0.005 $0.007 Base581 ms3 payers100% up
  13. 80api.magentlab.com/api/calc/rieteRIETE (bulk)$0.005 $0.007 Base959 ms3 payers100% up
  14. 80api.magentlab.com/api/calc/ripHevesi 2019 Recurrent Instability of the Patella (RIP) after first-time dislocation. Age <25 scores 2; skeletal immaturity / open physes 1; trochlear dysplasia Dejour A–D (caller-assigned present) 1; TT-TG/PL ratio ≥0.5 scores 1. Max 5. Bands 0–1 low, 2–3 intermediate, 4+ high (10-year recurrent instability 0.0%, 30.6%, 79.2%). Not a surgical order. Not Balcarek 2013 or later PIP models. magent does not read radiographs.$0.005 $0.007 Base804 ms3 payers100% up
  15. 80api.magentlab.com/api/calc/riskeOlmos 2017 RISK-E (Risk-Endocarditis) for in-hospital mortality after cardiac surgery in active left-sided IE. Age <=51: 0; 52-63: 9; 64-72: 13; >=73: 14. Flags: prosthetic_infection +6, periannular_complications +5, staphylococcus_aureus_or_fungi +9, acute_renal_failure +5, septic_shock +7, cardiogenic_shock +15, thrombocytopenia +7. Returns score and max_score 68 only. Not a diagnosis or surgery decision. magent does not examine the valve or read echo.$0.005 $0.007 Base725 ms3 payers100% up
  16. 80api.magentlab.com/api/calc/rmiJacobs 1990 risk of malignancy index: RMI = U × M × CA125 (U/ml). Caller assigns ultrasound_score 0, 1, or 3 (never 2) and postmenopausal (M=3 if true, else 1). Returns rmi to 1 decimal and exceeds_200 (true if RMI > 200). Not an ovarian-cancer diagnosis and not later RMI-2 or RMI-3.$0.005 $0.007 Base468 ms3 payers100% up
  17. 80api.magentlab.com/api/calc/rockall_prePre-endoscopy Rockall (bulk)$0.005 $0.007 Base520 ms3 payers100% up
  18. 80api.magentlab.com/api/calc/rome_ii_ibsThompson 1999 Rome II IBS. rome_ii_ibs is true iff at least 12 weeks (need not be consecutive) in the preceding 12 months of abdominal discomfort or pain and at least two of: relieved with defecation, onset associated with a change in stool frequency, and onset associated with a change in stool form. supporting_features_met is 0-3. Caller assigns four flags. magent does not examine the patient. Not a diagnosis, not Rome III, not Rome IV, not Manning, not IBS subtype.$0.005 $0.007 Base866 ms3 payers100% up
  19. 80api.magentlab.com/api/calc/rome_iv_chsStanghellini 2016 Rome IV CHS. rome_iv_chs is true iff stereotypical episodic vomiting resembling CVS, presentation after prolonged excessive cannabis use, relief with sustained cannabis cessation, criteria fulfilled for the last 3 months, and onset at least 6 months prior. pathologic_bathing is supportive and not required. Caller assigns six flags. magent does not take a cannabis history. Not a diagnosis, not cyclic vomiting syndrome.$0.005 $0.007 Base974 ms3 payers100% up
  20. 80api.magentlab.com/api/calc/rome_iv_globusAziz 2016 Rome IV esophageal globus. rome_iv_globus is true iff nonpainful lump or foreign-body sensation, occurrence between meals, no dysphagia or odynophagia, no gastric inlet patch, not explained by GERD or EoE, no major esophageal motor disorder, last-3-months criteria, and 6-month onset. Caller assigns eight flags. magent does not examine the patient or read endoscopy. Not a diagnosis, not functional heartburn, not Rome IV IBS, not CHS.$0.005 $0.007 Base957 ms3 payers100% up
  21. 80api.magentlab.com/api/calc/rome_iv_levator_aniRao 2016 Rome IV levator ani syndrome. rome_iv_levator_ani is true iff chronic or recurrent rectal pain or aching, episodes lasting 30 minutes or longer, tenderness during puborectalis traction (caller assigns; magent does not perform traction), other causes of rectal pain excluded, last-3-months criteria, and 6-month onset. Not a diagnosis, not proctalgia fugax, not unspecified functional anorectal pain (F2b).$0.005 $0.007 Base962 ms3 payers100% up
  22. 80api.magentlab.com/api/calc/rome_iv_ruminationStanghellini 2016 Rome IV rumination syndrome. rome_iv_rumination is true iff persistent or recurrent regurgitation of recently ingested food with subsequent spitting or remastication and swallowing, regurgitation not preceded by retching, last-3-months criteria, and 6-month onset. Supportive remarks (effortless, not preceded by nausea, recognizable food, ceases when acidic) are copy-only and not parsed. magent does not observe regurgitation. Not a diagnosis, not CHS, not CVS, not GERD.$0.005 $0.007 Base908 ms3 payers100% up
  23. 80api.magentlab.com/api/calc/rothChorin 2016 Roth score: caller max_count (integer 1-30, highest number reached counting 1 to 30 in one breath) and counting_time_seconds (greater than 0, at most 60). Echoes both; time to 1 decimal. Flags quote Table 2/discussion: max_count <10, counting_time <7 s, max_count <7, counting_time <5 s. Not a hypoxia class or 2021 general-practice cutoff. Not a medical device. magent does not time the patient.$0.005 $0.007 Base876 ms3 payers100% up
  24. 80api.magentlab.com/api/calc/rule_of_ninesAdult Wallace 1951 rule of nines: percent TBSA from eight region fractions (0 none, 0.5 half, 1 full) using head 9, each arm 9, anterior trunk 18, posterior trunk 18, each leg 18, perineum 1. magent does not examine the burn. Not Lund-Browder and not a Parkland fluid order (Parkland takes tbsa_percent separately).$0.005 $0.007 Base907 ms3 payers100% up
  25. 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 Base456 ms3 payers100% up
  26. 80api.magentlab.com/api/calc/scapEspaña 2006 SCAP. Eight caller-assigned flags: two major (arterial pH <7.30, SBP <90 mm Hg) and six minor (RR >30, altered mental status, BUN >30 mg/dL, hypoxemia as PaO2 <54 mm Hg or PaO2/FiO2 <250, age ≥80, multilobar or bilateral). Severe if 1 major or ≥2 minor. One point per true predictor (max 8). Not a diagnosis, not an ICU-admission order, not CURB-65, not PSI/PORT, not SMART-COP.$0.005 $0.007 Base763 ms3 payers100% up
  27. 80api.magentlab.com/api/calc/schwab_englandSchwab and England ADL (1969): caller-assigned integer 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, or 100 (completely independent; independent with some slowness; independent in most chores; not completely independent; some dependency; more dependent; very dependent; few chores with effort; nothing alone; totally dependent; vegetative). Returns score, max 100, and a stable label. 0% vegetative is scored. Not Hoehn and Yahr and not Karnofsky. magent does not observe the patient. Not a medical device.$0.005 $0.007 Base929 ms3 payers100% up
  28. 80api.magentlab.com/api/calc/score2ESC 2021 SCORE2 10-year fatal plus non-fatal CVD percent for age 40-69 from sex, current smoking, systolic BP, non-HDL cholesterol, and European geographic risk region (low, moderate, high, very_high). Published sex-specific coefficients and region scale1/scale2. Not SCORE2-OP, not SCORE2-Diabetes, not 2013 PCE, not Reynolds, not a diagnosis or statin order. magent does not assay lipids.$0.005 $0.007 Base756 ms3 payers100% up
  29. 80api.magentlab.com/api/calc/score2_diabetesESC 2023 SCORE2-Diabetes 10-year fatal plus non-fatal CVD percent for type 2 diabetes, age 40-79, from sex, smoking, systolic BP, total and HDL cholesterol, age at diagnosis, IFCC HbA1c, eGFR, and European geographic risk region. Not SCORE2, not SCORE2-OP, not a diagnosis or statin order. magent does not assay lipids, HbA1c, or eGFR.$0.005 $0.007 Base720 ms3 payers100% up
  30. 80api.magentlab.com/api/calc/shfmLevy 2006 Seattle Heart Failure Model 1-, 2-, and 3-year survival from Table 2 multivariate HRs. Score = sum of ln(HR)*x; S(t)=exp(-0.0405*t)**exp(score). Age, sex, NYHA, EF, ischemic etiology, SBP, furosemide-eq diuretic, labs, and already-on ACEI, beta-blocker, ARB, K-sparing diuretic, statin, BiV, ICD, or BiV-ICD. Caller assigns class, etiology, and therapy. magent does not measure labs or blood pressure. Not a diagnosis, prescription, or device order.$0.005 $0.007 Base939 ms3 payers100% up
  31. 80api.magentlab.com/api/calc/serum_osmolalitySerum osmolality (bulk)$0.005 $0.007 Base706 ms3 payers100% up
  32. 80api.magentlab.com/api/calc/scormaHeide 2001 SCORMA: extent_percent/5 + 5*intensity_sum + 2*symptom_sum/5. Extent 0-100 (diffuse cutaneous mastocytosis is 100). Four intensity signs 0-3 (pigmentation, vesiculation, elevation/induration, Darier's sign). Five symptoms 0-10 (flushing, provocation factors, diarrhoea, bone pain, pruritus). Max 100. magent does not examine the skin. Not a diagnosis, WHO/ICC criteria, REMA, or tryptase.$0.005 $0.007 Base870 ms3 payers100% up
  33. 80api.magentlab.com/api/calc/sg_portJacobs 2022 Table 3 Cox linear predictor for overall survival after resected major salivary gland cancer with versus without postoperative radiotherapy. Age per 10 years by PORT, male, Charlson-Deyo per point, gland, PORT by T stage, nodal-positivity ratio band, grade step, and positive margin as ln(HR). Not a 2-/5-/10-year OS percent (no printed S0). Not a radiation order. magent does not compute Charlson-Deyo or count nodes.$0.005 $0.007 Base994 ms3 payers100% up
  34. 80api.magentlab.com/api/calc/sickle_rbc_exchangeNadler 1962 adult blood volume plus exponential remaining-fraction washout (Y/Y0 = e^(−X)) for sickle RBC exchange replacement pRBC volume. FCR = target_hbs / initial_hbs; X = −ln(FCR). Caller supplies hematocrits and HbS percents. Optional approx units if unit_volume_ml is sent. Deterministic published arithmetic. Not an apheresis order or medical device.$0.005 $0.007 Base401 ms3 payers100% up
  35. 80api.magentlab.com/api/calc/sichCucchiara 2008 sICH after rtPA for ischemic stroke. Four caller-assigned 1-point flags: age >60, baseline NIHSS >10, baseline glucose >150 mg/dL (8.325 mmol/L), platelets <150,000/mm3. Total 0-4. Any ICH 2.6/9.7/15.1/37.9% for scores 0/1/2/>=3 (scores 3 and 4 share 37.9). magent does not assay glucose or platelets or compute NIHSS. Not a tPA order and not a hemorrhage diagnosis.$0.005 $0.007 Base865 ms3 payers100% up
  36. 80api.magentlab.com/api/calc/simplified_bishopLaughon 2011 simplified Bishop score from three caller-assigned Bishop 1964 integers: dilation, station, and effacement (each 0-3; max 9). Paper bins: dilation 0 / 1-2 / 3-4 / 5-6 cm; station -3 / -2 / -1 or 0 / +1 or +2; effacement 0-30 / 40-50 / 60-70 / 80%. favorable iff score >5 (Laughon compared with original Bishop >8; PPV 87.7% in that paper). magent does not examine the cervix or add consistency or position. Not a cervical exam or induction order.$0.005 $0.007 Base541 ms3 payers100% up
  37. 80api.magentlab.com/api/calc/sirsSIRS (bulk)$0.005 $0.007 Base967 ms3 payers100% up
  38. 80api.magentlab.com/api/calc/steroid_conversionGlucocorticoid dose conversion (bulk)$0.005 $0.007 Base686 ms3 payers100% up
  39. 80api.magentlab.com/api/calc/stool_osmotic_gapEherer–Fordtran 1992 fecal osmotic gap: stool osmolality minus 2×(stool Na + stool K). Assumed stool osm 290 mOsm/kg when measured osm is omitted. Deterministic published arithmetic with citation; not a diagnosis of osmotic versus secretory diarrhea.$0.005 $0.007 Base692 ms3 payers100% up
  40. 80api.magentlab.com/api/calc/vacoKing 2020 VACO Index logistic 30-day all-cause mortality from age, sex, caller-assigned unadjusted Charlson comorbidity index, and history of myocardial infarction or peripheral vascular disease. Supplement S3 coefficients. Age 85 or older uses the published combined CCI term. Not VACS Index 1.0 or 2.0, not a diagnosis, and not a treatment order.$0.005 $0.007 Base952 ms3 payers100% up
  41. 80api.magentlab.com/api/calc/vexusBeaubien-Souligny 2020 VExUS C only (not A, B, D, or E). Caller-assigned ivc_dilated (IVC ≥2 cm) plus hepatic, portal, and intra-renal Doppler each normal, mild, or severe. Grade 0 if the IVC is not dilated; 1 if dilated with zero severe patterns; 2 if exactly one severe; 3 if two or more are severe. magent does not perform ultrasound. Not an AKI diagnosis or a fluid-order. Not a medical device.$0.005 $0.007 Base916 ms3 payers100% up
  42. 80api.magentlab.com/api/calc/vocal_pennMahmud 2021 VOCAL-Penn 30-day postoperative mortality logistic for cirrhosis. log_odds = -5.472096 + 1.061725*ASA + 0.927904*emergency + surgery dummies (laparoscopic abdominal reference) + Stata 3-knot RCS albumin (2.7, 3.7, 4.4) and platelets (75, 152, 271) + 0.1448936*bilirubin - 0.7541669*obesity + 0.8268748*NAFLD. Percent to 1 decimal. Not a surgical order. magent does not assign ASA or read labs.$0.005 $0.007 Base754 ms3 payers100% up
  43. 80api.magentlab.com/api/calc/websterWebster 1968 rating scale: ten caller-assigned integers 0-3 (bradykinesia, rigidity, posture, upper_extremity_swing, gait, tremor, facies, seborrhea, speech, self_care). magent sums only (max 30) and does not examine the patient. Score only; magent does not invent mild/moderate/severe total-score bands. Historical 10-item 0-30 sum. Not MDS-UPDRS and not a Parkinson diagnosis. Not a medical device.$0.005 $0.007 Base688 ms3 payers100% up
  44. 80api.magentlab.com/api/calc/west_havenWest Haven / Conn hepatic encephalopathy grade 0-4 (Conn 1977). Deterministic published grade with citation. Not a diagnosis; magent does not examine the patient or apply ISHEN covert/overt or psychometric minimal-HE tests.$0.005 $0.007 Base686 ms3 payers100% up
  45. 80api.magentlab.com/api/calc/whrWaist–hip ratio from waist and hip circumference (WHO 2011 expert consultation). WHR = waist_cm / hip_cm after the same unit normalize; optional inches convert as cm = in * 2.54. Deterministic published arithmetic with citation. Not a medical device, body-fat diagnosis, or cardiovascular diagnosis; magent does not apply obesity or sex-specific cutoffs and does not measure the patient.$0.005 $0.007 Base839 ms3 payers100% up
  46. 80api.magentlab.com/api/calc/wisconsin_criteriaSitzman 2011 Wisconsin Criteria. Meets criteria if any one of five caller-assigned findings is true: bony step-off or instability, periorbital swelling or contusion, GCS < 14, malocclusion, or tooth absence. All five false does not meet. Returns meets_criteria and criteria_present (0–5). Not a diagnosis, not an imaging order, and not NEXUS, PECARN head, or Canadian CT Head. magent does not examine the face or assign GCS.$0.005 $0.007 Base919 ms3 payers100% up
  47. 80api.magentlab.com/api/calc/wound_classCDC/HICPAC surgical wound classification Class I-IV as assigned by the caller (Mangram 1999 Table 7). Returns wound_class, class_label (e.g. I/Clean), and the published Table 7 description. magent does not inspect the wound. Not SSI percentage rates (not in Table 7). Not a diagnosis of infection. Not antimicrobial prophylaxis selection. Not a medical device.$0.005 $0.007 Base790 ms3 payers100% up
  48. 80api.magentlab.com/api/calc/wpssMalcovati 2007 WPSS for MDS: WHO category (RA/RARS/5q- 0, RCMD/RCMD-RS 1, RAEB-1 2, RAEB-2 3), IPSS karyotype (good 0, intermediate 1, poor 2; caller assigns the three-group class), regular RBC transfusion 1 (at least one every 8 weeks over 4 months); max 6. very_low 0 through very_high 5–6. Not IPSS-R, not IPSS 1997, not DIPSS. magent does not karyotype or assign WHO category.$0.005 $0.007 Base676 ms3 payers100% up
  49. 80www.watchevelive.com/stampEve’s current one-line paper pick on a live Polymarket market. $0.05 USDC. A stamp is a read; it does not sit a ticket. Omit q for her current pick.$0.05 $50.00 Base761 ms3 payers100% up
  50. 80agdata.shveik.dev/x402/redditSearch Reddit or read a subreddit. Use mode hashtag with a subreddit name (no r/), profile with a username, or search with keywords, plus limit 1-20. Every record carries a normalized object with kind, title, body, author, subreddit, url, created_at, upvotes and comments_count. Comments are not fetched. upvotes and comments_count can be null, and subreddit mode may return the subreddit's own record (kind: community) with its description.$0.0495 $0.0535 Base469 ms3 payers100% up
  51. 80api.eucompliance.tools/x402/chatLLM completion per call, no account and no API key: POST a prompt (or a messages array) and get the model answer as JSON. Hard caps disclosed in every response (6,000 UTF-8 bytes in, 750 tokens out on this tier). Fixed price per call, signed receipt included so the answer stays auditable. Larger tier at /x402/chat-plus.$0.005 Base3006 ms3 payers97% up
  52. 80agents.daedalusdevelopmentgroup.com/v1/pdf-extractDDG agent-payable service request$0.005 $0.01 Base319 ms3 payers100% up
  53. 80browser-use.x402.paywithlocus.com/browser-use/run-taskLocus public pay-per-use API$0.031 Base523 ms3 payers80% up
  54. 80vape-x402.vapex402.workers.dev/data/yieldsVAPE yields — Yield pools filtered by chain/project/symbol, ranked by TVL, with apy/apyBase/ilRisk/exposure — enough to tell a real yield venue from a trap (huge APY + tiny TVL = red flag).$0.01 Base1304 ms2 payers83% up
  55. 80kino402.com/v1/audio/ttsElevenLabs TTS: 29 characters, voice 21m00Tcm4TlvDq8ikWAM$0.007 Base1317 ms2 payers83% up
  56. 80api.brazilayer.com/v1/desmatamento/rankingWhere Brazilian deforestation is concentrated right now: rank municipalities or states by area cleared in a window you choose, filterable by biome (Amazon or Cerrado), from official INPE satellite alerts. Feeds ESG screening, carbon-project integrity checks and commodity-origin risk. Free sample, no payment: https://api.brazilayer.com/v1/desmatamento/amostra$0.01 Base1554 ms2 payers83% up
  57. 80factline.dev/v1/kyc/checkOne-call onboarding check: sanctions screening of a name plus email, phone and EU VAT verification, with one verdict.$0.01 Base222 ms2 payers67% up
  58. 80factline.dev/v1/phone/verifyValidate any phone number worldwide: valid or not, E.164 and national format, country, line type (mobile, landline, VoIP, premium).$0.003 Base227 ms2 payers67% up
  59. 80attest.tollkit.dev/attestSigned, timestamped proof of what a page contained at a moment in time$0.25 $0.05 Base906 ms2 payers100% up
  60. 80api.17711.xyz/registry/websearch/v1/websearch/search_web_async[Deprecated - use websearch_search_web] Enqueues a websearch_search_web job and returns a task id immediately$0.009 Base545 ms2 payers75% up
  61. 80api.17711.xyz/registry/web-scraper/v1/web-scraper/scrape_url_async[Deprecated - use web_scraper_scrape_url] Enqueues a web_scraper_scrape_url job and returns a task id immediately$0.004 Base533 ms2 payers75% up
  62. 80api.hergertsynthora.com/v1/llm-fastSYNTHORA LLM Gateway FAST: OpenAI-compatible /v1/chat/completions pay-per-call, no API keys. Fast free-tier models (llama-3.1-8b class) with automatic upstream failover, Ed25519-signed. 0.005 USDC via x402 on Base. POST {"messages":[{"role":"user","content":"..."}]} (or {"prompt":"..."}).$0.005 Base429 ms2 payers75% up
  63. 80ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/base64EncodeBase64 encoder API. Encodes UTF-8 text to base64 instantly and correctly — skip burning agent tokens hand-computing base64, which LLMs frequently get wrong on padding and edge cases.$0.01 Base94 ms2 payers67% up
  64. 80ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/emergencyFundCalculatorEmergency fund calculator. Multiplies monthly essential expenses by a chosen runway length (in months) to compute a target emergency savings amount.$0.01 Base122 ms2 payers67% up
  65. 80ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/generateInternetDataNetwork-format generator API. Generates a valid ipv4/ipv6 address (optionally within a CIDR block or named network range) or a well-formed JWT string (via one of: ipv4, ipv6, jwt). Accepts optional locale (default en_US). jwt header/payload objects are capped to 2000 serialized characters.$0.01 Base99 ms2 payers67% up
  66. 80ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/teslaSavingsCalculatorTesla savings calculator. Compares annual electricity cost for a Tesla against annual gas cost for a comparable gas vehicle, accounting for free-charging usage, and computes break-even years, cost per full charge, and gas-price-equivalent effective MPG.$0.01 Base275 ms2 payers67% up
  67. 80x402.ochinimus.app/api/liq-heatmapLiquidation heatmap by PRICE LEVEL: where leverage actually got flushed in the last N hours — USD, prints and long/short split per price zone, with the hottest zone flagged. Use when you need to answer: At which price levels did leverage actually get flushed? Built from real liquidation prints, not entry-price estimates.$0.05 $0.02 Solana338 ms2 payers100% up
  68. 80openai.mm.family/x402/v1/models/gpt-5.6-sol/chat/completionsgpt-5.6-sol chat completion (x402 paid)$0.001 $0.001 Base660 ms2 payers100% up
  69. 80shop.netlobo.com/v1/chat/completionsOpenAI-compatible chat completions (abliterated LLM). POST the standard {"model","messages"} body; answered in <= 512 tokens.$0.01 $0.005 Base802 ms2 payers100% up
  70. 80www.blockchainiq.co/api/x402/v1/dashboards/:slugCrypto analytics dashboard data with an analyst read on each chart. Pick one by slug: market-overview, on-chain-metrics, defi-tvl-and-yields, stablecoin-story, tokenized-rwas, leverage-and-derivatives, liquidity-and-venues, volatility-and-execution, corporate-treasuries, crypto-fundraising, exploit-losses, xrp-ledger, bitcoin-network, ethereum-network, base-network, arbitrum-network, aptos-network, provenance-network, bnb-network. Every panel as JSON. $0.25 per call. Blockchain IQ.$0.25 $0.05 Base424 ms2 payers100% up
  71. 80base.mapleai.shop/jevJev structured decisions via SystemOne, priced by input tokens$0.001 $0.0025 Base537 ms2 payers100% up
  72. 80smartcontractexplainer.onrender.com/api/check-walletCheck an EVM wallet's live token/NFT approvals and get a plain-language verdict (SAFE, CAUTION or RISK) with an explanation$0.10 $0.04 Base339 ms2 payers100% up
  73. 80tenjin.sh/api/read/:handle/:slugPay-per-read pieces by independent publishers. Find one by question first: POST https://tenjin.sh/api/search is free and returns payable candidates or an honest MISS. The 402 carries a free preview; pay it for the full text JSON. Agent guide: https://tenjin.sh/llms.txt. Full catalog: https://tenjin.sh/.well-known/x402$0.01 $0.10 Base501 ms2 payers100% up
  74. 80http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/job/preflightNormalize whether a public job is still published/open and its canonical apply route. Base mainnet USDC$0.003 Base298 ms2 payers67% up
  75. 80http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/x402/preflightRead-only probe of x402 PaymentRequired requirements; does not pay. Base mainnet USDC$0.002 Base205 ms2 payers67% up
  76. 80http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/service/changedCheap watchdog: material service state changed since prior canonical hash? Base mainnet USDC$0.001 Base200 ms2 payers67% up
  77. 80402.com.tr/api/x402/safe-to-send🆕 Before your agent sends, approves or signs to an address: one GO/REVIEW/STOP verdict. Screens OFAC sanctions, Coinbase/Basename identity, wallet vs contract, how long the address has existed, and whether contract logic can be swapped AFTER you send. Every factor returns what it found and what it could not read — a check that did not run never reads as clean, so GO means everything material was actually screened. Not financial advice.$0.01 $0.03 Base476 ms2 payers100% up
  78. 80agentforge-taupe.vercel.app/v1/token-researchDeep token due diligence for analysts and trading agents: aggregates CoinGecko market data, DeFiLlama DeFi metrics, Etherscan contract verification, and Polymarket prediction markets into one multi-source report. Category: data.$0.04 $0.03 Base334 ms2 payers100% up
  79. 80agent-dispatch-production-4e75.up.railway.app/v1/smsSend one SMS to a mobile number, paid per message in USDC with x402. Use it when an agent must notify a person by text. The 402 quotes the exact price for the destination and message length. No account and no API key: any wallet that pays sends in one call. An opt-out link is appended to the message, and numbers that opted out are refused. Returns an order; poll GET /v1/orders/{id} for delivery status.$0.055 $0.056 Base447 ms2 payers100% up
  80. 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 Base914 ms2 payers100% up
  81. 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 Base756 ms2 payers100% up
  82. 80api.magentlab.com/api/calc/remaÁlvarez-Twose 2012 REMA: male +1, female −1; serum baseline tryptase <15 μg/L −1, 15–25 0, >25 +2; pruritus, hives or angioedema present −2, absent +1; syncope or presyncope +3. Range −4 to +7. Clonality likely iff score ≥2. Caller assigns sex, sBt, cutaneous signs, and syncope. Not a medical device, not a diagnosis of SM, not WHO SM criteria. magent does not assay tryptase.$0.005 $0.007 Base724 ms2 payers100% up
  83. 80api.magentlab.com/api/calc/rebound_hyperbilirubinemiaChang 2017 three-variable rebound hyperbilirubinemia score: +15 if GA <38 weeks, −7 × age at phototherapy start in days, −4 × (caller AAP phototherapy threshold − TSB at termination), +50. Scores <20 correspond to a <4% chance of TSB returning to threshold within 72 hours. magent does not assay bilirubin or compute the AAP nomogram. Not Chang 2019. Not a phototherapy order.$0.005 $0.007 Base605 ms2 payers100% up
  84. 80api.magentlab.com/api/calc/reach_bYang 2011 REACH-B 17-point HCC risk (non-cirrhotic REVEAL-HBV). Sex female 0, male 2; age 30-65 (30-34 0 through 60-65 6); ALT U/L <15 0, 15-44 1, >=45 2; HBeAg positive 2; HBV DNA copies/mL <10000 0, 10000-99999 3, 100000-999999 5, >=1000000 4. Returns score 0-17 and published 3/5/10-year percents. Not a diagnosis, not a biopsy, not for cirrhosis. magent does not assay ALT or HBV DNA.$0.005 $0.007 Base964 ms2 payers100% up
  85. 80api.magentlab.com/api/calc/rcriLee 1999 revised cardiac risk index: six 1-point factors (high-risk surgery, ischemic heart disease, heart failure, cerebrovascular disease, insulin diabetes, creatinine >2.0 mg/dL) and class I–IV. Deterministic published arithmetic with citation; not operative clearance.$0.005 $0.007 Base759 ms2 payers100% up
  86. 80api.magentlab.com/api/calc/rbc_aboAABB Standards 28th ed. Standard 5.14 RBC ABO/Rh compatibility from caller-assigned recipient and unit ABO (o, a, b, ab) and RhD (positive, negative). Group O RBCs to O/A/B/AB; A to A/AB; B to B/AB; AB to AB. RhD-negative units to either RhD; RhD-positive units only to RhD-positive recipients. Not a transfusion order. magent does not type blood. Does not encode emergency RhD-positive-to-negative exceptions, plasma, or platelets.$0.005 $0.007 Base452 ms2 payers100% up
  87. 80api.magentlab.com/api/calc/raspVertesi 2003 RASP multiplies exclusive source (A), inoculum type (B), and transmission (C) to Z, then total_risk = (1/Z) × volume (D). Table 2: <1/1000 definitely indicated; 1/1000–1/10 000 recommended but optional; 1/10 001–1/100 000 optional but not recommended; >1/100 000 not indicated. Average Canadian community prevalence is baked into the scores. Caller-assigned tokens. Not a PEP order. magent does not interpret the source patient.$0.005 $0.007 Base572 ms2 payers100% up
  88. 80api.magentlab.com/api/calc/r_factorCIOMS R factor from ALT, ALP, and laboratory ULNs (Bénichou 1990). R = (ALT/ALT_ULN)/(ALP/ALP_ULN), rounded to 1 decimal, then hepatocellular (R ≥ 5), cholestatic (R ≤ 2), or mixed (2 < R < 5). Deterministic published arithmetic with citation. Not a medical device, not a DILI diagnosis or RUCAM score; magent does not assay enzymes. R is the enzyme pattern only.$0.005 $0.007 Base921 ms2 payers100% up
  89. 80api.magentlab.com/api/calc/puqeKoren 2002 12-hour PUQE: three caller-assigned integers 1-5 (nausea duration, vomiting episodes, and retching episodes over the last 12 hours as in that paper's table). Sum 3-15. magent does not interview the patient. Koren 2002 published no 3-6 / 7-12 / ≥13 total-score cuts; later 24-hour and trimester-long forms are not scored. Not an antiemetic order and not a medical device.$0.005 $0.007 Base537 ms2 payers100% up
  90. 80api.magentlab.com/api/calc/pucaiTurner 2007 pediatric ulcerative colitis activity index (PUCAI): six caller-assigned item points (abdominal pain, rectal bleeding, stool consistency of most stools, stools per 24 hours, nocturnal stools, activity level) using that paper's published integers. magent sums only (max 85) and returns the published activity band (<10 remission, 10-34 mild, 35-64 moderate, ≥65 severe). magent does not examine the child. Not a diagnosis and not the adult Mayo score.$0.005 $0.007 Base917 ms2 payers100% up
  91. 80api.magentlab.com/api/calc/pregnancy_due_datesPregnancy estimated due date from a certain LMP using ACOG Committee Opinion 700 Naegele: edd_days_from_lmp = 280 + (cycle_length_days - 28). Inputs are numeric days_since_lmp (0-294) and cycle_length_days (21-35); those bands are magent clamps. Reports gestational_age_days and days_until_edd (negative if past EDD). Not a dating ultrasound. magent does not interpret imaging. Not a delivery date order.$0.005 $0.007 Base384 ms2 payers100% up
  92. 80api.magentlab.com/api/calc/pre_scorePRE (Pittsburgh Response to Endovascular therapy) score: age + 2×NIHSS - 10×ASPECTS (Rangaraju 2015). Integer PRE, quartiles <0 / 0-24 / 25-49 / >=50, and recanalization-benefit strata <-24 / -24 to 49 / >=50. Not a thrombectomy recommendation. The caller assigns NIHSS and ASPECTS; magent does not assign NIHSS or read CT.$0.005 $0.007 Base836 ms2 payers100% up
  93. 80api.magentlab.com/api/calc/phenytoin_correctionSheiner–Tozer / Winter–Tozer albumin-adjusted total phenytoin: Ccorr = Cobs / ((0.2 or 0.1) × albumin_g_dl + 0.1). Renal factor 0.1 when renal_impairment is true. Deterministic published arithmetic with citation; not a free phenytoin level or a dose.$0.005 $0.007 Base873 ms2 payers100% up
  94. 80api.magentlab.com/api/calc/phasesGreving 2014 PHASES 5-year rupture risk for an unruptured intracranial aneurysm. Caller assigns population (north_america_europe 0, japanese 3, finnish 5), hypertension (1), age >=70 (1), size mm (<7 0, 7.0-9.9 3, 10.0-19.9 6, >=20 10), earlier SAH (1), and site (ica 0, mca 2, aca_pcom_posterior 4). Returns points (max 22) and grouped 5-year risk percent. Not a treatment order or PHASES of care. magent does not assign ancestry or read imaging.$0.005 $0.007 Base961 ms2 payers100% up
  95. 80api.magentlab.com/api/calc/pgcsPaediatric Glasgow Coma Scale (PGCS) from caller-assigned eye 1-4, verbal 1-5, and motor 1-6 integers (Reilly 1988). Sum 3-15; 1976-style six-point motor. magent does not observe the child, take age, pick age-specific wording, or implement an age-max expected-normal table. Not adult GCS 1974 five-point motor. Not a diagnosis, trauma triage, or intubation order.$0.005 $0.007 Base922 ms2 payers100% up
  96. 80api.magentlab.com/api/calc/pegKrebs 2009 PEG from three caller-assigned integers 0-10 (pain_average, enjoyment_of_life, general_activity). Unweighted mean (range 0-10, one decimal). magent does not interview the patient. Krebs 2009 published no diagnostic cutoff; magent does not invent mild, moderate, or severe bands. Not a pain diagnosis, opioid order, or the full Brief Pain Inventory.$0.005 $0.007 Base955 ms2 payers100% up
  97. 80api.magentlab.com/api/calc/pediatric_ettCole 1957 uncuffed pediatric endotracheal tube internal diameter: age_years/4 + 4 millimetres. Deterministic published arithmetic with citation; not a device-selection order or length-based tape.$0.005 $0.007 Base958 ms2 payers100% up
  98. 80api.magentlab.com/api/calc/onlsGraham 2006 ONLS: caller-assigned arm_scale 0-5 plus leg_scale 0-7. Sum 0-12. Score 0 is no limitations. Arm 5 or leg 7 is no purposeful movement of that region. Leg 0 requires walking, stairs, and running unaffected. Remaining grades match ODSS; this is not ODSS and not Adjusted ONLS. magent does not observe the patient. No published total-score severity bands. Not a diagnosis and not a medical device.$0.005 $0.007 Base809 ms2 payers100% up
  99. 80api.magentlab.com/api/calc/nlrNLR (bulk)$0.005 $0.007 Base877 ms2 payers100% up
  100. 80api.magentlab.com/api/calc/nincds_adrdaMcKhann 1984 NINCDS-ADRDA diagnostic category as assigned by the caller (definite, probable, possible, or unlikely). Returns the token and the published defining-features description. magent does not examine the patient. Not NIA-AA 2011/2018. Not DSM. Not an Alzheimer's diagnosis. Not a medical device.$0.005 $0.007 Base989 ms2 payers100% up