x402watch

19,733 paid endpoints are listed. 18,910 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 22:23 UTC · 19,733 probed

18,910 answering 402263 down434 rejecting126 no paywall2,380 price drift
  1. 100agent402.tools/api/chain/nonceThe transaction count of an account, which is the nonce its next transaction must carry. Ask for block "pending" to include transactions already in the mempool, which is what you want before signing; the default "latest" counts only mined transactions. Returns the count as a decimal string and as hex. EVM chains: ethereum, base, polygon, arbitrum, optimism.$0.001 Base125 ms1 payers100% up
  2. 100agent402.tools/api/chain-infoOne-call chain state snapshot: chain id, latest block number, and current gas price (wei + gwei) for Ethereum, Base, Polygon, Arbitrum, or Optimism. Keyless multi-endpoint failover.$0.001 Base100 ms1 payers100% up
  3. 100agent402.tools/api/caseConvert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, lower, UPPER.$0.001 Base112 ms1 payers100% up
  4. 100agent402.tools/api/card-validateValidate a payment card number (Luhn checksum) and detect the brand. Numbers are not stored or logged.$0.001 Base111 ms1 payers100% up
  5. 100agent402.tools/api/captcha-generateMint a stateless captcha challenge to gate your OWN endpoint: returns a human prompt plus a salted sha256 answer hash you keep and verify later (sha256(salt + normalized answer) === answerHash) - no server state, no shared secret. Types: math (arithmetic) or alnum (character code), difficulty 1–3. Deterministic tooling for running bot protection, not defeating it.$0.001 Base87 ms1 payers100% up
  6. 100agent402.tools/api/calcSafely evaluate an arithmetic expression (+ - * / % ^ and parentheses). No code execution - a real parser, not eval.$0.001 Base93 ms1 payers100% up
  7. 100agent402.tools/api/cagrCompound annual growth rate between a beginning and ending value over N years: (end/begin)^(1/years) - 1. Also returns total growth over the whole period.$0.001 Base108 ms1 payers100% up
  8. 100agent402.tools/api/business-daysCount business days (Mon–Fri) between two dates, inclusive of the start, exclusive of the end. Optional list of holiday dates to skip.$0.001 Base119 ms1 payers100% up
  9. 100agent402.tools/api/brotli-decompressDecompress a base64-encoded Brotli payload. Returns the result as utf8 (text) or base64 (binary). Refuses to expand past 10MB to defend against zip bombs.$0.001 Base114 ms1 payers100% up
  10. 100agent402.tools/api/brotli-compressCompress a string with Brotli (RFC 7932) and return it as base64. Brotli typically beats gzip by 15-25% on text - useful when bytes matter (e.g. cramming context into an LLM prompt, fitting under a transport cap). Slower than gzip; pick gzip if speed matters more than ratio.$0.001 Base114 ms1 payers100% up
  11. 100agent402.tools/api/break-evenBreak-even point for a product: the units and revenue at which total revenue covers fixed plus variable costs. Also returns contribution margin and margin ratio.$0.001 Base90 ms1 payers100% up
  12. 100agent402.tools/api/bond-pricePrice a fixed-coupon bond from its yield to maturity: present-value the coupons plus face. Returns clean price, coupon per period, current yield, and premium/discount vs par.$0.001 Base90 ms1 payers100% up
  13. 100agent402.tools/api/base58Base58 encode or decode text (Bitcoin/IPFS alphabet). mode: encode (default) or decode.$0.001 Base114 ms1 payers100% up
  14. 100agent402.tools/api/base32Base32 (RFC 4648) encode or decode text. mode: encode (default) or decode.$0.001 Base111 ms1 payers100% up
  15. 100agent402.tools/api/base-convertConvert an integer between number bases (radix 2-36), e.g. binary↔hex↔decimal. Arbitrary size via BigInt.$0.001 Base100 ms1 payers100% up
  16. 100agent402.tools/api/barcode-decodeDecode a barcode or QR code from an image. Send a base64 PNG or JPEG (or a data: URL); returns the decoded text and the symbology. Reads QR, DataMatrix, and 1D barcodes (EAN/UPC/Code39/Code128/ITF/Codabar). Deterministic, no network, no model.$0.001 Base96 ms1 payers100% up
  17. 100agent402.tools/api/b20-feature-idPure-CPU helper: turn a B20 feature string (e.g. base.b20_asset) into its bytes32 feature id and ready-to-send isActivated(bytes32) calldata for the Activation Registry. No network egress.$0.001 Base97 ms1 payers100% up
  18. 100agent402.tools/api/asn-infoLook up the Autonomous System (ASN), prefix, country, registry, and allocation date for an IPv4 address - or for a hostname (which is resolved first). Uses Team Cymru's free DNS-based IP→ASN mapping; no HTTPS upstream, no auth, no rate-limit headaches.$0.001 Base184 ms1 payers100% up
  19. 100agent402.tools/api/annuityPresent and future value of a level annuity (equal periodic payments). Supports an ordinary annuity (payments at period end) and an annuity-due (payments at period start).$0.001 Base119 ms1 payers100% up
  20. 100agent402.tools/api/amortizationBuild the full per-period amortization schedule for a fully-amortizing loan. Each row reports the period number, payment, the principal vs. interest split for that payment, and the remaining balance after that payment. Use this when the user wants to see how interest tapers over the life of the loan, or to model an extra-payment scenario by reading the balance at any period.$0.001 Base96 ms1 payers100% up
  21. 100agent402.tools/api/ageCompute a precise age (years, months, days) from a birth date to today (or a given date), plus total days.$0.001 Base97 ms1 payers100% up
  22. 100agent402.tools/api/add-timeAdd (or subtract) a duration to a date. duration like "2d", "-3h", "1w 2d", "90m". Returns the resulting UTC ISO timestamp.$0.001 Base132 ms1 payers100% up
  23. 100agent402.tools/v1/metered/geminiGoogle's generateContent wire priced from the request itself: the 402 quotes this exact body, from $0.001, with upto buyers settling actual usage. Use it when an agent built on the Gemini SDK needs a supported model paid per call without an API key.$0.0019 Base94 ms1 payers100% up
  24. 100agent402.tools/api/xml-to-jsonParse XML into a JSON object tree (attributes under _attrs, text under _text; repeated elements become arrays).$0.002 Base108 ms1 payers100% up
  25. 100agent402.tools/api/x402-quoteProbe any URL and decode its HTTP 402 payment requirements (price, asset, network, pay-to) into clean JSON - what an agent needs to decide whether/how to pay. Read-only; does not pay.$0.002 Base81 ms1 payers100% up
  26. 100agent402.tools/api/world-bank-searchSearch the World Bank indicator catalog (1,400+ indicators across GDP, demographics, health, environment, education, etc.) by keyword. Returns indicator codes you can feed into /api/world-bank-indicator.$0.002 Base81 ms1 payers100% up
  27. 100agent402.tools/api/weather-hourly48-hour hourly weather forecast for any location: temperature, precipitation probability and amount, wind, cloud cover, humidity. Open-Meteo, no key, global.$0.002 Base116 ms1 payers100% up
  28. 100agent402.tools/api/weather-daily7-day daily weather forecast for any location: high/low temp, precipitation sum and probability, max wind, UV index, sunrise/sunset. Open-Meteo, no key, global.$0.002 Base81 ms1 payers100% up
  29. 100agent402.tools/api/weather-air-qualityCurrent air quality index and pollutant concentrations for any location: US AQI, PM2.5, PM10, ozone, NO2, SO2, CO. Open-Meteo air quality API, no key, global.$0.002 Base96 ms1 payers100% up
  30. 100agent402.tools/api/wallet-transactionsReturn the most recent asset transfers (incoming + outgoing) for a wallet address - native coin, ERC-20, ERC-721, ERC-1155 - already merged and sorted newest first. Each row carries the block, tx hash, counterparty, asset, and decimal value. Cap is 100 per direction; widen the window via `fromBlock` if you need deeper history.$0.002 Base93 ms1 payers100% up
  31. 100agent402.tools/api/wallet-balancesAll token balances for any address in one call, from Coinbase's indexed data API - ERC-20 + native on EVM, SPL on Solana; no per-token contract calls, no RPC wrangling. Networks: base, ethereum, base-sepolia, solana, solana-devnet. Symbols/decimals populated for whitelisted tokens (USDC always included).$0.002 Base92 ms1 payers100% up
  32. 100agent402.tools/api/unshorten-urlFollow a short link's redirect chain (bit.ly, t.co, youtu.be, tracking links, …) without downloading any page body: returns the final URL, the final HTTP status, and every hop with its status code and Location target. Capped at 5 redirects; every hop is SSRF-re-validated, so chains that dive into private networks are blocked. Lets agents pre-flight links before fetching or citing them.$0.002 Base81 ms1 payers100% up
  33. 100agent402.tools/api/totpCompute the current TOTP code (RFC 6238, 30s period, SHA-1, 6 digits) from a base32 secret. Useful for agents that must complete 2FA flows they are authorized for.$0.002 Base119 ms1 payers100% up
  34. 100agent402.tools/api/token-balancesERC-20 balances of one wallet for a NAMED list of token contracts (1-20) - the targeted complement to the full-portfolio wallet-balance tool. One balance read for the whole list plus symbol/decimals per contract (cached an hour server-side), so 'how much USDC and WETH does this wallet hold on Base?' is a single cheap call with exact decimal strings, not a portfolio dump.$0.002 Base93 ms1 payers100% up
  35. 100agent402.tools/api/srt-convertConvert subtitles between SRT, WebVTT, plain text, and JSON cues. Send SRT or VTT text (auto-detected) - or a JSON cues array [{start,end,text}] with times in ms - and the target format. Deterministic, pure CPU.$0.002 Base95 ms1 payers100% up
  36. 100agent402.tools/api/sitemapFetch and parse a sitemap.xml (or sitemap index): returns up to 500 URLs with lastmod, or the child sitemaps of an index.$0.002 Base97 ms1 payers100% up
  37. 100agent402.tools/api/sanctions/walletIs this blockchain address on the OFAC SDN list? Screens any address against every Digital Currency Address OFAC publishes (Bitcoin, Ethereum, Tron, USDT, USDC, Monero, Litecoin and more). A match names the sanctioned entity and its SDN id. A miss is reported as 'not on the lists checked, as of this date' and is never a clearance - the answer carries that caveat in the payload. Deterministic: a cached copy of the published list, no model in the path.$0.002 Base133 ms1 payers100% up
  38. 100agent402.tools/api/redactMask emails, phone numbers, credit-card-like numbers, IPs, and SSNs in text. Returns the redacted text and counts by type.$0.002 Base119 ms1 payers100% up
  39. 100agent402.tools/api/perp-orderbookThe live level-2 order book for one perpetual: best bid and ask, mid, spread in basis points, up to 20 levels a side with cumulative depth and bid/ask imbalance. Use it when an agent is sizing an order, checking liquidity before a trade or measuring book pressure at a point in time.$0.002 Base95 ms1 payers100% up
  40. 100agent402.tools/api/perp-dexsEvery builder-deployed perpetuals dex on Hyperliquid (HIP-3): dex name, full name, deployer, oracle updater and fee recipient, how many markets it lists (active vs delisted, so a wound-down dex reads as one), how many assets carry a streaming open-interest cap and the cap total, plus the current perp-deploy auction (start, end, start/current/end gas). The native dex is not a row; use perp-markets for it. Keyless public data.$0.002 Base104 ms1 payers100% up
  41. 100agent402.tools/api/perp-dex-limitsRisk limits and status of ONE builder-deployed perp dex (HIP-3): total open-interest cap, per-perp OI size cap, max transfer notional, the per-coin OI caps, the coins currently AT their OI cap, and the dex's total net deposit. Three keyless reads (perpDexLimits, perpDexStatus, perpsAtOpenInterestCap) in one call.$0.002 Base112 ms1 payers100% up
  42. 100agent402.tools/api/options-volumeOnchain options protocols ranked by 24h notional volume with 7d and 30d volume, 1d and 7d change and the chains each runs on, plus sector totals. Use it when an agent is comparing decentralized options venues or tracking whether onchain options activity is growing.$0.002 Base86 ms1 payers100% up
  43. 100agent402.tools/api/openapi-to-curlBuild a runnable curl command for one operation in an OpenAPI 3.x or Swagger 2.x spec. Locate the operation by operationId (preferred) or by method + path, substitute path parameters using the spec's example values, include required query and header parameters with their example values, and attach a JSON body when the operation defines one. Returns the structured request (method, url, headers, body) alongside the assembled curl string with POSIX single-quote escaping.$0.002 Base105 ms1 payers100% up
  44. 100agent402.tools/api/openapi-required-paramsFor one operation, return the minimum set of inputs an agent must provide to make a successful call. Locate the op by `operationId` (preferred) or by `method`+`path`. Output is a single flat array tagged by `in`: `path` (always required), `query` / `header` / `cookie` (only when `required: true`), and `body.field` entries naming the top-level required fields of a required JSON request body.$0.002 Base126 ms1 payers100% up
  45. 100agent402.tools/api/openapi-lintScore an OpenAPI 3.x or Swagger 2.x spec on agent-readiness - i.e. does an LLM-driven caller have what it needs to call the API correctly without guessing. Returns a 0..100 score, severity counts, and a structured list of violations with stable rule codes. Checks: documented title/servers/paths, per-operation summary/description/operationId/tags, documented 2xx + error responses, param descriptions/schemas/examples, response descriptions, JSON response schemas.$0.002 Base110 ms1 payers100% up
  46. 100agent402.tools/api/onchain-sql-schemaThe table + column schema for the onchain-sql tool - every queryable table (base.events, base.transactions, base.blocks, base.decoded_user_operations, base.transaction_attributions, solana.instructions, …) with its columns and types. Fetch once, then write SQL with confidence.$0.002 Base98 ms1 payers100% up
  47. 100agent402.tools/api/mev-block-paymentLook up the MEV-Boost payment for a specific slot or block number via the Flashbots relay. Returns the builder, proposer, value paid in ETH, gas usage, and tx count. Returns found=false if the block was built locally or via a different MEV-Boost relay (Flashbots is one of several).$0.002 Base91 ms1 payers100% up
  48. 100agent402.tools/api/metaFetch page metadata for a URL: title, description, OpenGraph, Twitter cards, canonical URL, favicon.$0.002 Base81 ms1 payers100% up
  49. 100agent402.tools/api/memory/recallRecall remembered text by similarity to a query (ranked by cosine similarity), not by exact key. Returns the top-k matches with scores. The retrieval half of the wallet-scoped semantic memory.$0.002 Base107 ms1 payers100% up
  50. 100agent402.tools/api/l2-tvlTop L2s by Total Value Locked (TVL) via DeFiLlama. Returns each L2 with TVL in USD, native token symbol, and CoinGecko/CMC ids. Classification combines DeFiLlama's parent-chain hint with a curated list of well-known L2s (Arbitrum, Optimism, Base, zkSync Era, Linea, Scroll, Mantle, Polygon zkEVM, Starknet, Blast, Mode, Manta, Metis, Polygon, Taiko, Immutable zkEVM, World Chain).$0.002 Base106 ms1 payers100% up
  51. 100agent402.tools/api/keywordsTop keywords and two-word phrases by frequency (stopwords removed). Cheap, deterministic signal for routing, tagging, and dedup.$0.002 Base107 ms1 payers100% up
  52. 100agent402.tools/api/kalshi-weather-indexKalshi's own minute-resolution city temperature index (Fahrenheit), the series its hourly temperature markets settle on, computed from weighted member stations. Ask for a trailing window (lastSec, default one hour, max 7 days) or a from/to window; detailed adds every station's reading per minute; includeCalibrations adds the published station-weight and offset timeline.$0.002 Base105 ms1 payers100% up
  53. 100agent402.tools/api/kalshi-live-dataThe live feed a Kalshi event settles on, from Kalshi's free live_data tier: a crypto event returns the CF Benchmarks price series, candlesticks (15M, 1M) and the maturity time; an economic-data event (CPI, jobs) returns the provider's series with the target period. Pass an eventTicker, or a seriesTicker (e.g. KXBTC) and the soonest open event is resolved for you. The type field names the schema of details.$0.002 Base97 ms1 payers100% up
  54. 100agent402.tools/api/json-to-csvConvert a JSON array of objects to CSV. Nested objects are flattened to dot-path columns.$0.002 Base101 ms1 payers100% up
  55. 100agent402.tools/api/image-cropCrop an image to a pixel box, and/or rotate (90/180/270) and flip it - applied in that order. Send a public image URL or a base64 image. Returns the result as binary, or as a JSON data URI with dataUri:true. Deterministic.$0.002 Base200 ms1 payers100% up
  56. 100agent402.tools/api/fx-rateLive currency conversion using European Central Bank reference rates (via Frankfurter). Converts an amount between two currencies and returns the rate and date.$0.002 Base88 ms1 payers100% up
  57. 100agent402.tools/api/farcaster-by-addressReverse-lookup an Ethereum address to its Farcaster account (via verified address). Returns FID, username, display name, bio, follower/following counts, and Warpcast URL, or found=false if the address has not verified on Farcaster. Use to label wallet activity with the owner's Farcaster identity when ENS is missing.$0.002 Base93 ms1 payers100% up
  58. 100agent402.tools/api/extract-entitiesPull emails, URLs, IPv4s, @mentions, and #hashtags out of free text. Returns deduped lists.$0.002 Base98 ms1 payers100% up
  59. 100agent402.tools/api/erc721-ownerWho owns this NFT? Calls ownerOf(tokenId) on any ERC-721 contract on Ethereum, Base, Polygon, Arbitrum, or Optimism. Complements nft-holdings (which lists a WALLET's NFTs) - this answers by TOKEN. Keyless multi-endpoint failover.$0.002 Base90 ms1 payers100% up
  60. 100agent402.tools/api/email-deliverabilityEnd-to-end email-auth report for a domain: SPF + DMARC + DKIM (probes common selectors automatically) + MX records + score 0–100. The one call to make when 'why is our mail going to spam?' lands in your inbox.$0.002 Base82 ms1 payers100% up
  61. 100agent402.tools/api/eas-attestationsList EAS (Ethereum Attestation Service) attestations for an address as recipient, attester, or either, on mainnet/Base/Optimism/Arbitrum/Sepolia. Returns attestation id, attester, recipient, schema id, revocable/revoked flags, timestamp, and decoded data JSON. Use to verify Gitcoin Passport stamps, Coinbase verifications, KYC attestations, or any other on-chain claim about an address.$0.002 Base101 ms1 payers100% up
  62. 100agent402.tools/api/dns-lookupResolve any DNS record type for a host: A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, SRV, PTR. Returns the records plus a count. Built on Node's native resolver - no external API.$0.002 Base97 ms1 payers100% up
  63. 100agent402.tools/api/dex-poolRead on-chain state of a Uniswap V3 pool: token0/token1 addresses + decimals, fee tier, current sqrtPriceX96, tick, in-range liquidity, and the decoded human-readable spot price (token1 per token0). One $0.002 call replaces ~6 RPC roundtrips on the caller's side.$0.002 Base100 ms1 payers100% up
  64. 100agent402.tools/api/defi-yieldsLive yield opportunities across DeFi, filterable by chain, protocol, token symbol, stablecoin-only, minimum TVL and minimum APY: pool identity, TVL in dollars, total APY split into base and reward, 1-day, 7-day and 30-day APY change, impermanent-loss risk and exposure type. Use it to find, compare or monitor where a given asset earns the most right now.$0.002 Base94 ms1 payers100% up
  65. 100agent402.tools/api/defi-protocolOne DeFi protocol in full: TVL rank, TVL per chain, recent change, market cap to TVL, token, website, audits and parent, with name suggestions when the slug is unknown. Use it when an agent is researching a specific protocol and needs its size, footprint and audit status in one answer.$0.002 Base98 ms1 payers100% up
  66. 100agent402.tools/api/defi-feesProtocols ranked by fees paid by users or by revenue kept, with 24h, 7d, 30d, 1y and all-time totals, change, category and chains, and chain-level gas fees on request. Use it when an agent is comparing protocols on real usage rather than TVL or valuing a token against the fees its protocol earns.$0.002 Base89 ms1 payers100% up
  67. 100agent402.tools/api/defi-chainsBlockchains ranked by DeFi total value locked with each chain's share of the total, native token, EVM chain id and CoinGecko id. Use it when an agent is comparing chains by DeFi activity or needs the canonical ids to query other services about a chain.$0.002 Base90 ms1 payers100% up
  68. 100agent402.tools/api/csv-to-mdConvert CSV into a GitHub-flavored Markdown table (first row is the header).$0.002 Base114 ms1 payers100% up
  69. 100agent402.tools/api/csv-to-jsonParse CSV (quoted fields supported) into a JSON array of objects, using the first row as headers (header=false for arrays).$0.002 Base95 ms1 payers100% up
  70. 100agent402.tools/api/crypto-indicatorsRSI, MACD, EMA 20/50/200, SMA 20/50, Bollinger bands, ATR and VWAP computed deterministically from live candles for one coin and interval, with the latest series points and a plain-language summary. Use it when an agent needs standard technical indicators without fetching candles and computing them itself.$0.002 Base87 ms1 payers100% up
  71. 100agent402.tools/api/contract-codeIs this address a contract, and what code does it hold? Returns isContract, deployed bytecode size, and the keccak-256 hash of the bytecode (stable fingerprint for comparing deployments) on Ethereum, Base, Polygon, Arbitrum, or Optimism. Keyless multi-endpoint failover.$0.002 Base111 ms1 payers100% up
  72. 100agent402.tools/api/compound-interestCompute future value of a principal under compound interest. Returns future value, total interest earned, and the effective annual rate (APY) given the compounding frequency. Matches Excel's FV(rate, nper, 0, -principal) and the classic (1+r/n)^(nt) textbook formula.$0.002 Base112 ms1 payers100% up
  73. 100agent402.tools/api/chain/erc1155-balanceHow many of one ERC-1155 token id an account holds, read straight from the contract. ERC-1155 is the multi-token standard behind most game items, editions and passes, where a single contract holds many ids and a balance is a quantity rather than ownership of one thing. Returns the balance as a decimal string. EVM chains: ethereum, base, polygon, arbitrum, optimism.$0.002 Base129 ms1 payers100% up
  74. 100agent402.tools/api/bond-ytmSolve a bond's yield to maturity from its market price - the annual rate that present-values the coupons plus face to that price. Bracketed bisection root-find.$0.002 Base100 ms1 payers100% up
  75. 100agent402.tools/api/black-scholesPrice a European option (call or put) with the Black-Scholes-Merton model, plus the greeks (delta, gamma, vega, theta, rho). Continuous dividend yield supported. Greeks are per unit: theta is per year, vega per 1.00 change in volatility, rho per 1.00 change in rate. Deterministic - matches standard references to the cent.$0.002 Base102 ms1 payers100% up
  76. 100agent402.tools/api/b20-activation-checkIs B20 live on Base mainnet? Queries the Activation Registry precompile for base.b20_asset and base.b20_stablecoin (or a custom feature id). Honest pre-launch too: reports not-activated until the registry flips.$0.002 Base89 ms1 payers100% up
  77. 100agent402.tools/api/address-labelLabel a known EVM address from a curated, committed dataset: major stablecoin + token contracts (USDC on every chain we settle on, USDT, DAI, WETH, WBTC), DEX routers (Uniswap, 1inch, 0x), canonical L1↔L2 bridges, large exchange hot/cold wallets, and burn/system addresses. Deterministic and offline - the provenance field states the dataset revision. Unknown addresses return {found:false}, not an error.$0.002 Base218 ms1 payers100% up
  78. 100agent402.tools/api/a2a-card-validateValidate an A2A (Agent2Agent protocol) Agent Card: required fields, skill shape, transport names, capability flags - spec v0.3 structural core. Returns errors, interop warnings, and a normalized summary (skills, interfaces, capabilities). Deterministic mini-A2A tooling - check a card before your agent trusts it.$0.002 Base176 ms1 payers100% up
  79. 100agent402.tools/v1/nano/geminiGoogle's native generateContent wire on the nano tier. Send Gemini's own request shape (contents, systemInstruction, generationConfig, function declarations) and get Gemini's own response shape (candidates, usageMetadata) back. Point a Google GenAI SDK at this gateway and pay per request with USDC, no account. Also answers the Google-shaped path /v1beta/models/<model>:generateContent.$0.003 Base125 ms1 payers100% up
  80. 100agent402.tools/api/usdc-balanceRead the USDC balance of any address on Base, Polygon, Arbitrum, Optimism, Ethereum, Monad, Celo, Avalanche, or Sei. Read-only on-chain call. The minimal single-token read for payment flows - for EVERY token a wallet holds in one call use wallet-balance.$0.003 Base103 ms1 payers100% up
  81. 100agent402.tools/api/transfer-authorizationBuild the EIP-3009 transferWithAuthorization typed data for a gasless USDC transfer on Base/Polygon/Arbitrum/Optimism/Ethereum/Monad/Celo/Avalanche/Sei - the exact EIP-712 object an agent signs with its OWN key to authorize an x402 payment. We construct it; we never sign or send. Non-custodial.$0.003 Base92 ms1 payers100% up
  82. 100agent402.tools/api/sol-trendingWhat Solana tokens are being pushed right now: DexScreener's top boosted tokens (paid promotion, ranked by boost amount - a signal of marketing spend, not quality) and the latest token profiles (fresh listings with a filled-in profile), both filtered to Solana. Each row carries the mint, DexScreener URL, description snippet and links. Feed the mints into sol-token-safety to separate the promoted from the sound. Keyless; two small DexScreener reads in parallel.$0.003 Base99 ms1 payers100% up
  83. 100agent402.tools/api/sol-swap-quoteExecutable swap quote on Solana from Jupiter's aggregator: input and output mint, amount in base units, slippage in bps - returns out amount, minimum out after slippage, price impact percent, the routed DEX labels in hop order with split percentages, the USD value of the swap and the context slot. A real multi-hop route across Solana DEX liquidity, so the number reflects depth, not a spot price. Quote only - nothing is signed or sent. Keyless.$0.003 Base83 ms1 payers100% up
  84. 100agent402.tools/api/skill/timezone-plannerTime zone conversion, business day calculation, and cron schedule preview - scheduling in one pass. Timezone planner skill pack: one x402 payment runs 3 underlying tools (time-convert, business-days, cron-next); partial-success per step.$0.003 Base106 ms1 payers100% up
  85. 100agent402.tools/api/skill/number-crunchStatistical analysis suite: descriptive statistics, correlation analysis, and outlier detection on a single dataset. Number crunch skill pack: one x402 payment runs 3 underlying tools (stats-summary, correlation, outliers); partial-success per step.$0.003 Base108 ms1 payers100% up
  86. 100agent402.tools/api/skill/markdown-convertMarkdown to HTML and back - a round-trip conversion that proves fidelity and gives you both formats from one input. Markdown to HTML round-trip skill pack: one x402 payment runs 3 underlying tools (markdown-to-html, html-to-markdown, text-diff); partial-success per step.$0.003 Base101 ms1 payers100% up
  87. 100agent402.tools/api/skill/jwt-toolkitDecode and verify a JWT in one pass - see the payload and check the signature. JWT toolkit skill pack: one x402 payment runs 3 underlying tools (jwt-decode, jwt-verify, jwt-sign); partial-success per step.$0.003 Base98 ms1 payers100% up
  88. 100agent402.tools/api/perp-marketsEvery listed perpetual futures market in one call: mark, oracle and mid price, 24-hour change, funding (hourly, 8-hour, annualized), open interest in coins and dollars, 24-hour notional volume and max leverage, sortable by volume, open interest, funding or change. Use it as the one-shot market map before drilling into a single symbol.$0.003 Base99 ms1 payers100% up
  89. 100agent402.tools/api/perp-dex-marketsSnapshot of every market on ONE builder-deployed perp dex (HIP-3): mark and oracle price, 24h change, hourly funding (plus 8h and annualized), open interest in units and USD, 24h notional volume, impact premium, max leverage, growth mode, isolated-only and margin mode, deployer fee scale, and the dex's collateral token. Coins carry the dex prefix (xyz:TSLA). Sort by volume, openInterest, funding, change or coin; limit caps the list (max 500). Keyless public data.$0.003 Base95 ms1 payers100% up
  90. 100agent402.tools/api/pdf-to-markdownConvert a PDF to clean markdown: headings, paragraphs, and bullets reconstructed from the text layer - ready to drop into a model's context. Body: {"url":"https://…/file.pdf"}.$0.003 Base87 ms1 payers100% up
  91. 100agent402.tools/api/pdf-rotateRotate pages by 90/180/270°. Body: {"url":"https://…/file.pdf","degrees":90,"pages":"1-3"?}. Omit "pages" to rotate all. Returns the new PDF as base64.$0.003 Base102 ms1 payers100% up
  92. 100agent402.tools/api/fc-user-searchSearch Farcaster users by name or username fragment. Returns up to 10 compact profiles: fid, username, display name, bio, follower and following counts, Neynar quality score, primary verified Ethereum address. Use to resolve a person or brand to a fid before fc-user-casts, or to find who to follow on a topic.$0.003 Base104 ms1 payers100% up
  93. 100agent402.tools/api/fc-channelDetails for one Farcaster channel by id (e.g. base) or FIP-2 parent URL: name, description, follower and member counts, public-casting flag, creation date, lead and moderator fids, pinned cast. Use to validate a channel id before pulling its feed, or to size a community.$0.003 Base103 ms1 payers100% up
  94. 100agent402.tools/api/event-logsFetch contract event logs (eth_getLogs) on Ethereum, Base, Polygon, Arbitrum, or Optimism - bounded so it always answers: block range capped at 2000 blocks (default: the last 100, auto-narrowed for busy contracts), at most 200 logs returned (truncated flag set if more matched). Filter by contract address and optional topic0 (event signature hash). Keyless multi-endpoint failover.$0.003 Base111 ms1 payers100% up
  95. 100agent402.tools/api/edgar-13f-datasetsThe SEC's bulk Form 13F Data Sets: every quarterly (2013Q2-2023Q4) and rolling three-month (2024-) archive the SEC publishes, newest first, with its window, size and download URL, plus the seven tables each archive carries (SUBMISSION, COVERPAGE, OTHERMANAGER, OTHERMANAGER2, SIGNATURE, SUMMARYPAGE, INFOTABLE) and the readme. Read from sec.gov's own listing, cached 6 hours. Pair with edgar-13f-dataset-head to read a bounded head of one table without downloading the archive.$0.003 Base110 ms1 payers100% up
  96. 100agent402.tools/api/contract-abiFetch the verified ABI for a contract address from Sourcify, plus a ready-to-use list of human-readable function signatures with their 4-byte selectors. Covers 8 EVM mainnets. Unverified contracts return a structured {verified:false} miss. Pair with /api/calldata-decode to decode transactions against this ABI.$0.003 Base103 ms1 payers100% up
  97. 100agent402.tools/api/archive-snapshotLook up a URL in the Internet Archive's Wayback Machine: returns the archived snapshot closest to an optional timestamp (default: most recent), with the snapshot URL, capture time, and archived HTTP status. Useful for citations, dead-link recovery, and checking what a page said at a point in time. URLs never archived return {available:false}.$0.003 Base95 ms1 payers100% up
  98. 100agent402.tools/api/vehicle-recallsNHTSA safety recalls for a vehicle by make/model/year: campaign number, affected component, summary, consequence, and remedy. Live gov data, no key.$0.004 Base98 ms1 payers100% up
  99. 100agent402.tools/api/token-price-historyHistorical USD price series for a token, by ticker symbol (ETH, BTC, SOL, ...) or by ERC-20 contract + network, at 5-minute (up to 2 days), hourly (up to 30 days) or daily (up to 365 days) resolution. Returns the points plus first/last/high/low and the percent change over the window - the data behind 'how did this token move over the last N days' without a separate market-data subscription. 404 (not charged) when the token is not in the price feed.$0.004 Base95 ms1 payers100% up
  100. 100agent402.tools/api/sql-guardReview a SQL statement before running it against production: a pass / warn / block verdict naming concrete risks (unbounded UPDATE or DELETE, tautological WHERE, DROP, TRUNCATE, statement stacking, privilege changes, catalog writes) and, on pass, an Ed25519 certificate bound to the statement's SHA-256 that a database layer can verify before executing. Use it as the last check between an agent and a destructive query.$0.004 Base98 ms1 payers100% up