x402 Services
| Rank | Service | Category | Chains | Volume · 30d | Transactions · 30d | Buyers |
|---|---|---|---|---|---|---|
| — | CHAPPY Japan Address Preflight chappy-japan-address-preflight.pre23964wb.workers.dev Reproducible Japan Post evidence before an autonomous agent submits a Japanese address. One 0.02 USDC x402 call returns a fail-closed town-level consistency… | AI | Base | $0.02 | 1 | 1 |
| — | Character encoding encoding.openverbs.com Character-set and Unicode utilities — detect the charset of a byte buffer, transcode bytes between character sets, apply Unicode normalisation forms, and… | Search | Base | $0.00 | 0 | 0 |
| — | OpenGradient memchat.io OpenGradient's pay-per-use AI API. Generate AI video from text or an image, paid per clip in Base USDC over x402: no account or API key. | AI | Base | $0.945 | 1 | 1 |
| — | ChatRIP Legends chatrip.app Paid AI chat service for interacting with Legends through the ChatRIP API. | AI | Base | $0.14 | 2 | 3 |
| — | Check Digit Validator checkdigit.openverbs.com Validate common check-digit schemes — Luhn (cards), ISBN-10/13, EAN/UPC/GTIN, IMEI and US ABA routing numbers. Malformed input is rejected, a wrong check… | Search | Base | $0.00 | 0 | 0 |
| — | Chemical equations chemeq.openverbs.com Chemical-reaction maths — balance equations into whole-number coefficients (exact rational null-space), run mole/mass stoichiometry from one known species to… | Chain infra | Base | $0.00 | 0 | 0 |
| — | Chemistry chem.openverbs.com Periodic-table lookup and molar-mass computation — look up any of the 118 elements by symbol, name or atomic number, search the table, and compute the molar… | Utility | Base | $0.00 | 0 | 0 |
| — | chess402 chess402.vercel.app Pay-per-call chess API. x402 + MPP wrappers around popular Lichess endpoints. | Data | Base | $0.00 | 0 | 0 |
| — | chiefofstaff token safety chiefofstaff-solana.iodized-lemon.workers.dev Hyperliquid perp market data for trading agents, pay per call over x402 (USDC on Base or Solana, no API key): funding extremes across all HL perps… | Data | Base, Solana | $0.00 | 0 | 0 |
| — | chipscan.steveyuowoo.workers.dev chipscan.steveyuowoo.workers.dev This service is hosted at chipscan.steveyuowoo.workers.dev. | Other | Base | $0.00 | 0 | 0 |
| — | Chit chit402.com Signed spend receipts for agent x402 payments — who paid which call, verifiable by a third party. Treasury desk for agent spend — export, policy, evidence… | AI | Base, Solana | $0.00 | 0 | 0 |
| — | ChronicaPulse chronicapulse.theaslangroupllc.com Global genealogy and historical archive intelligence API. Full-text search across Chronicling America (1770–1963 US newspapers), Library of Congress, Trove… | AI | Base, Solana | $0.00 | 0 | 0 |
| — | ChronoSure chrono.schemasure.com ChronoSure turns a local wall-clock time into an exact UTC instant, and tells you plainly when that is impossible. Every local time is classified as unique… | AI | Base | $0.00 | 0 | 0 |
| — | Circadian API circadian-agent.com Pay-per-call web data APIs run by a disclosed autonomous AI agent business. Payment is per request via the x402 protocol: call without payment to receive an… | AI | Base | $0.01 | 1 | 1 |
| — | Circle Agent Readiness API circle-agent-readiness-api.vercel.app Validate autonomous finance agent manifests before they are allowed to transact. | AI | Base | $0.00 | 0 | 0 |
| — | Mekler · Citation Overlap Checker citation-overlap-checker.mekler.ai Mekler helps research and diligence agents inspect citation overlap before relying on several sources as corroboration. It finds duplicate URLs, shared links… | AI | Base, Solana | $0.00 | 0 | 0 |
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