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Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
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4,273 results- Xx402-v2-mint-clinvar-variant-search.vercel.appSearch & web
ClinVar variant search (keyless). POST {q|query}/{retmax?}. Empty -> 400 not charged.
Basex402-v2-mint-clinvar-variant-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-clinicaltrials-lookup.vercel.appOther services
ClinicalTrials.gov study lookup (keyless API v2). POST {nct_id} and/or {query,page_size?}. Empty studies → 404 not charged.
Basex402-v2-mint-clinicaltrials-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-clim-trace-em.vercel.appOther services
Climate TRACE country emissions (keyless). POST {countries}/{since?}/{to?}. Empty -> 400 not charged. uk-carbon-intensity/eonet/humdata adjacency disclosed.
Basex402-v2-mint-clim-trace-em.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-cleveland-art-search.vercel.appSearch & web
Cleveland Museum of Art open-access search (keyless). POST {q}/{limit?}. Empty -> 400 not charged. Met adjacency disclosed.
Basex402-v2-mint-cleveland-art-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-claim-check.vercel.appSocial & people
Claim check with citations (claims only, never people). Wikidata+OpenAlex+Crossref grounding + LLM verdicts. Unverifiable → charged:false.
Basex402-v2-mint-claim-check.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-citybikes-network.vercel.appOther services
CityBikes bike-share network lookup (keyless). POST {id|network} required (or q/city/country with limit for filtered list). Unpaid empty → 402; after settle empty/invalid → 400 charged:false. NEVER returns full 113KB networks dump — filter/paginate only. Soft disclose tfl-line-status / mbta-* (transit).
Basex402-v2-mint-citybikes-network.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-cisa-kev.vercel.appOther services
CISA Known Exploited Vulnerabilities catalog (keyless). POST {} or {cve_id?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Disclose adjacency: hashlookup-circl / openssf-scorecard / osv-vuln-lookup / nvd-cve-lookup / crt-sh-ct-lookup (≠ those products).
Basex402-v2-mint-cisa-kev.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-chi-property-check.vercel.appAI & agents
Chicago building violations check (partner wrap of x402-mcp). Refund if partner fails after settle.
Basex402-v2-mint-chi-property-check.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-chi-food-inspect.vercel.appData & research
Chicago food-inspection Socrata feed (keyless). POST {q?}/{limit?}/{dba_name?}. Empty -> 400 not charged. NYC/Chicago open-data adjacency disclosed.
Basex402-v2-mint-chi-food-inspect.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-chess-com-player.vercel.appSocial & people
Chess.com public player profile (keyless). POST {username|user|name}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose lichess-user (chess lane).
Basex402-v2-mint-chess-com-player.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-chembl-target-lookup.vercel.appOther services
ChEMBL target lookup (keyless). POST {q|query}/{target_chembl_id?}/{limit?}. Empty -> 400 not charged.
Basex402-v2-mint-chembl-target-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-chembl-molecule-lookup.vercel.appOther services
ChEMBL molecule lookup (keyless). POST {query} or {chembl_id} and/or {limit?}. Empty → 404 not charged.
Basex402-v2-mint-chembl-molecule-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-chebi-compound.vercel.appOther services
ChEBI chemical entity/compound lookup (keyless). POST {chebi_id}/{id?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Disclose adjacency: pubchem-compound / chembl-*-lookup / kegg-compound-lookup (≠ those pages).
Basex402-v2-mint-chebi-compound.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-census-geocode.vercel.appData & research
US Census Geocoder (keyless). POST {address} one-line and/or {street,city,state,zip?}. No match → 404 not charged.
Basex402-v2-mint-census-geocode.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-celestrak-gp.vercel.appOther services
CelesTrak GP / TLE elements (keyless). POST {group|name|catnr,limit?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose spaceflight / wheretheiss / jpl / launch-library.
Basex402-v2-mint-celestrak-gp.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-catfacts.vercel.appOther services
Cat Fact Ninja random fact (keyless). POST {max_length?} optional. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose dog-ceo-breeds / meowfacts.
Basex402-v2-mint-catfacts.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-catalogue-of-life.vercel.appSearch & web
Catalogue of Life / ChecklistBank name-usage search (keyless). POST {q, limit?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Disclose adjacency: itis-taxonomy-search / gbif-species-match / worms-aphia-lookup / idigbio-records (≠ those products; CoL ChecklistBank taxonomy lane).
Basex402-v2-mint-catalogue-of-life.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-cactus-structure-lookup.vercel.appDeveloper tools
NIH CACTUS chemical structure convert (keyless). POST {q|name}/{format?}. Empty -> 400 not charged.
Basex402-v2-mint-cactus-structure-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-bos-property-check.vercel.appAI & agents
Boston Analyze Boston building/property violations (partner wrap of x402-mcp). Refund if partner fails after settle.
Basex402-v2-mint-bos-property-check.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-bna-property-check.vercel.appAI & agents
Nashville residential STR permit check (partner wrap of x402-mcp). Refund if partner fails after settle.
Basex402-v2-mint-bna-property-check.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-bluesky-public-did.vercel.appSocial & people
Bluesky / ATProto public handle→DID resolve (keyless). POST {handle}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose hn-stories (social adjacency; ≠ HN story lists).
Basex402-v2-mint-bluesky-public-did.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-bls-series-lookup.vercel.appOther services
BLS publicAPI timeseries lookup (keyless). POST {series_id} and/or {startyear?,endyear?}. Empty → 404 not charged.
Basex402-v2-mint-bls-series-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-biorxiv-details.vercel.appOther services
bioRxiv preprint details by date (keyless). POST {from?}/{to?}/{cursor?}/{server?}. Empty -> 400 not charged. medrxiv/Crossref adjacency disclosed.
Basex402-v2-mint-biorxiv-details.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-base-tx-decision.vercel.appAI & agents
Base submit-or-wait + EIP-1559 fee suggestion (partner wrap of x402-mcp). Refund if partner fails after settle.
Basex402-v2-mint-base-tx-decision.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-base-finality-check.vercel.appAI & agents
Base tx finality / confirmation check (partner wrap of x402-mcp). Refund if partner fails after settle.
Basex402-v2-mint-base-finality-check.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-bart-advisories.vercel.appOther services
BART service advisories BSA (Bay Area; public demo key). POST {cmd|station?}. Empty -> 400 not charged. Disclose TfL/MBTA transit adjacency.
Basex402-v2-mint-bart-advisories.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-aviationweather-metar.vercel.appData & research
Aviation Weather Center METAR observations (keyless). POST {ids}/{icao?} required. Empty -> 400 not charged. nws-alerts / weather / air-quality adjacency disclosed.
Basex402-v2-mint-aviationweather-metar.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-atx-property-check.vercel.appAI & agents
Austin short-term rental license status (partner wrap of x402-mcp). Refund if partner fails after settle.
Basex402-v2-mint-atx-property-check.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-anitya-project.vercel.appOther services
Anitya / release-monitoring package versions (keyless). POST {name|project|q,limit?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose dockerhub / package-registry / foojay / deps-dev / endoflife.
Basex402-v2-mint-anitya-project.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-amtrak-trains.vercel.appOther services
Amtrak live trains (keyless via Amtraker). POST {train?}/{route?}. Empty -> 400 not charged. bart/TfL/MBTA transit adjacency disclosed.
Basex402-v2-mint-amtrak-trains.vercel.appfrom $0.021 endpoint
Service data comes from the Coinbase CDP and PayAI discovery lists and refreshes every few hours. Usage is paid calls over the last 30 days. APIs launched here are verified by us; the rest are paid directly to their owners.