Explore APIs
Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
- Projects
- 4.5K
- Paid endpoints
- 106K
- Paid calls · 30 days
- 1M
- Launched here
- 0
All projects
4,273 results- Xx402-v2-mint-inspire-journals.vercel.appSearch & web
INSPIRE HEP journals search (keyless; disclose inspire-authors/Crossref journals). POST {q|query}/{size?}. Empty -> 400 not charged.
Basex402-v2-mint-inspire-journals.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-inspire-authors.vercel.appSearch & web
INSPIRE HEP authors search (keyless; disclose literature adjacency). POST {q|query}/{page? size?}. Empty -> 400 not charged.
Basex402-v2-mint-inspire-authors.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-inaturalist-taxa-search.vercel.appSearch & web
iNaturalist taxa search (keyless). POST {q|query}/{per_page?}. Empty -> 400 not charged.
Basex402-v2-mint-inaturalist-taxa-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-ietf-dt-search.vercel.appSearch & web
IETF datatracker document search (keyless). POST {q|name__contains}/{limit?}. Empty -> 400 not charged. Standards/protocol vertical.
Basex402-v2-mint-ietf-dt-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-idigbio-records.vercel.appSearch & web
iDigBio museum specimen records search (keyless). POST {rq?}/{limit?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Disclose adjacency: gbif-species-match / inaturalist-taxa-search / itis-taxonomy-search / eol (deferred) / obis-occurrence.
Basex402-v2-mint-idigbio-records.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-hypothes-annotations.vercel.appSearch & web
Hypothesis annotation search (keyless). POST {uri?}/{tag?}/{limit?}. Empty -> 400 not charged. New annotations vertical (low adjacency).
Basex402-v2-mint-hypothes-annotations.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-humdata-package-search.vercel.appSearch & web
HDX Humdata CKAN package_search (keyless). POST {q}/{rows?}. Empty -> 400 not charged. fema/gdacs/eonet adjacency disclosed.
Basex402-v2-mint-humdata-package-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-hathitrust-volumes.vercel.appOther services
HathiTrust volumes brief lookup (keyless). POST {isbn|oclc|lccn?}. Empty -> 400 not charged. Disclose openlibrary/LoC adjacency.
Basex402-v2-mint-hathitrust-volumes.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-hashlookup-circl.vercel.appOther services
CIRCL hashlookup file-hash reputation (keyless). POST {sha1}/{md5?}/{sha256?} — at least one hash required. Empty -> 400 not charged. Distinct file-hash lane — disclose security adjacency vs openssf/osv/nvd/crt.
Basex402-v2-mint-hashlookup-circl.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-hackernews-item.vercel.appSearch & web
Hacker News item by id (keyless Firebase). POST {id|item_id}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose hn-stories / lobsters-hottest.
Basex402-v2-mint-hackernews-item.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-gutendex-books.vercel.appSearch & web
Project Gutenberg books via Gutendex (keyless). search/topic/ids/author_year → trimmed book list.
Basex402-v2-mint-gutendex-books.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-gleif-lei-lookup.vercel.appData & research
GLEIF LEI lookup (keyless). POST {lei?}/{legalName?}. Empty -> 400 not charged. ror/sec-ticker adjacency disclosed. Preserve [] in filter params.
Basex402-v2-mint-gleif-lei-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-geocode-search.vercel.appSearch & web
Open-Meteo geocoding (keyless; Nominatim replacement). name (+ count/language/country) → trimmed places (name/lat/lon/country/admin1).
Basex402-v2-mint-geocode-search.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-gdacs-events.vercel.appSearch & web
GDACS disaster events SEARCH (keyless). POST {alertlevel?}/{eventlist?}/{fromdate?}/{todate?}/{country?}. Uses geteventlist/SEARCH only (MAP returns 400). Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Light adjacency: usgs-landslides / quake lanes (GDACS multi-hazard ≠ USGS landslide/quake feeds).
Basex402-v2-mint-gdacs-events.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-gbif-species-match.vercel.appOther services
GBIF species name match (keyless). POST {name}. No match → 404 not charged.
Basex402-v2-mint-gbif-species-match.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-gain-property-check.vercel.appAI & agents
Gainesville FL code cases (partner wrap of x402-mcp). Refund if partner fails after settle.
Basex402-v2-mint-gain-property-check.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-fr-agencies.vercel.appOther services
US Federal Register agencies directory (keyless; disclose federal-register-documents). POST {q?|slug?}. Empty -> 400 not charged.
Basex402-v2-mint-fr-agencies.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-foojay-packages.vercel.appOther services
Foojay Disco JDK package discovery (keyless). POST {version?, distribution?, package_type?, operating_systems?, architectures?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose adoptium-releases / endoflife-product (≠ Adoptium thin twin; Java Disco lane).
Basex402-v2-mint-foojay-packages.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-figshare-article-search.vercel.appSearch & web
Figshare article/dataset search (keyless; prior-403 recovery). POST {q|search_for|query}/{page_size?}. Empty -> 400 not charged.
Basex402-v2-mint-figshare-article-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-fema-disaster-lookup.vercel.appOther services
OpenFEMA disaster declarations lookup (keyless). POST {disaster_number} and/or {state,incident_type?}. Empty rows → 404 not charged.
Basex402-v2-mint-fema-disaster-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-federal-register-documents.vercel.appSearch & web
US Federal Register documents search (keyless). POST {q|term}/{per_page?}. Empty -> 400 not charged. New gov/regulatory vertical.
Basex402-v2-mint-federal-register-documents.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-fear-greed-index.vercel.appCrypto & DeFi
Crypto Fear & Greed Index (alternative.me, keyless). POST {limit?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose defillama-protocols / coinpaprika (crypto sentiment lane ≠ mempool/btc-fee).
Basex402-v2-mint-fear-greed-index.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-fbi-wanted.vercel.appSearch & web
FBI Wanted list search (keyless). POST {query?} / {pageSize?} / {page?}. Empty → 400 not charged.
Basex402-v2-mint-fbi-wanted.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-eurostat-dataset.vercel.appData & research
Eurostat dissemination statistics (keyless). POST {dataset}/{geo?}/{time?}. Empty -> 400 not charged. New EU official-stats vertical — disclose dataeuropa/oecd/worldbank adjacency.
Basex402-v2-mint-eurostat-dataset.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-europepmc-search.vercel.appSearch & web
Europe PMC literature search (keyless). POST {query}/{pageSize?}. Empty -> 400 not charged. pubmed/crossref/doaj/biorxiv adjacency disclosed.
Basex402-v2-mint-europepmc-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-epss-score.vercel.appOther services
FIRST.org EPSS exploit-prediction (keyless). POST {cve|cves}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose cisa-kev / osv-vuln-query / nist-nvd-cve-lookup / openssf-scorecard.
Basex402-v2-mint-epss-score.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-epa-envirofacts-tri.vercel.appOther services
EPA Envirofacts TRI facility lookup (keyless). POST {state_abbr?} / {facility_name?} / {rows?}. Empty → 400 not charged.
Basex402-v2-mint-epa-envirofacts-tri.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-epa-echo-facilities.vercel.appSearch & web
EPA ECHO CWA facility search (keyless). POST {p_fn|facility_name} and/or geo filters. Empty → 400 not charged.
Basex402-v2-mint-epa-echo-facilities.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-eonet-events.vercel.appOther services
NASA EONET natural events (keyless). POST {limit?}/{status?}/{category?}. Empty -> 400 not charged. fema/GDACS adjacency disclosed.
Basex402-v2-mint-eonet-events.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-entity-schema-extract.vercel.appOther services
Extract entities/fields from text into a caller JSON Schema. Wikidata QID links + source spans. Fail closed (no charge) if output does not validate.
Basex402-v2-mint-entity-schema-extract.vercel.appfrom $0.011 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.