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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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367 results- Xx402-v2-mint-openlibrary-search.vercel.appSearch & web
Open Library search.json (keyless). POST {q}/{limit?}/{offset?}/{fields?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. No catalog adjacency.
Basex402-v2-mint-openlibrary-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openfda-food-enforcement.vercel.appSearch & web
openFDA food enforcement / recalls (keyless). POST {search} and/or {status?,limit?}. Empty → 404 not charged.
Basex402-v2-mint-openfda-food-enforcement.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openfda-drug-event.vercel.appSearch & web
openFDA drug adverse events / FAERS (keyless). POST {search} and/or {limit?}. Empty → 404 not charged.
Basex402-v2-mint-openfda-drug-event.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openfda-drug-enforcement.vercel.appSearch & web
openFDA drug enforcement / recalls (keyless). POST {search?} / {limit?}. Empty → 400 not charged.
Basex402-v2-mint-openfda-drug-enforcement.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openfda-device-recall.vercel.appSearch & web
openFDA device recall (keyless). POST {search} and/or {limit?}. Empty → 404 not charged.
Basex402-v2-mint-openfda-device-recall.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openfda-device-event.vercel.appSearch & web
openFDA device adverse events (keyless). POST {search} and/or {limit?}. Empty → 404 not charged. W32 deferral.
Basex402-v2-mint-openfda-device-event.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openfda-device-510k.vercel.appSearch & web
openFDA device 510(k) clearance lookup (keyless). POST {search} and/or {applicant?,product_code?,limit?}. Empty → 404 not charged.
Basex402-v2-mint-openfda-device-510k.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openbrewerydb-breweries.vercel.appSearch & web
Open Brewery DB brewery search (keyless). POST {} or {by_city?}/{per_page?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Open data brewery directory.
Basex402-v2-mint-openbrewerydb-breweries.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openalex-works.vercel.appSearch & web
OpenAlex works search (keyless). POST {query|search} with optional {per_page?}. Empty → 400 not charged.
Basex402-v2-mint-openalex-works.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openalex-sources.vercel.appSearch & web
OpenAlex sources/venues search (keyless; disclose works/authors adjacency). POST {q|search|query}/{per_page?}. Empty -> 400 not charged. W44 deferral return.
Basex402-v2-mint-openalex-sources.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openalex-authors.vercel.appSearch & web
OpenAlex authors search (keyless; disclose works adjacency). POST {q|search|query}/{per_page?}. Empty -> 400 not charged.
Basex402-v2-mint-openalex-authors.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openaire-publications.vercel.appSearch & web
OpenAIRE publications search (keyless). POST {q|title}/{size?}. Empty -> 400 not charged. Disclose openalex-works/crossref adjacency.
Basex402-v2-mint-openaire-publications.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-openaire-datasets.vercel.appSearch & web
OpenAIRE datasets search (keyless; ≠ publications). POST {title?}/{doi?}/{size?}. Empty -> 400 not charged. openaire-publications/zenodo/dryad/figshare/dataverse adjacency disclosed.
Basex402-v2-mint-openaire-datasets.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-ols-ontology-search.vercel.appSearch & web
EBI OLS4 ontology term search (keyless). POST {q|query}/{rows?}. Empty -> 400 not charged.
Basex402-v2-mint-ols-ontology-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-obis-occurrence.vercel.appSearch & web
OBIS marine species occurrences (keyless). POST {scientificname} (+ optional size). Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Disclose adjacency: gbif-species-match / inaturalist-taxa-search / itis-taxonomy-search / eol (eol deferred).
Basex402-v2-mint-obis-occurrence.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-nih-reporter-lookup.vercel.appSearch & web
NIH RePORTER v2 project search (keyless). POST {term} and/or {fiscal_years?,offset?,limit?}. Empty → 404 not charged.
Basex402-v2-mint-nih-reporter-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-news-brief.vercel.appSearch & web
News brief with sources (GDELT headlines+links only). No article body republish. No charge on empty/failed.
Basex402-v2-mint-news-brief.vercel.appfrom $0.011 endpoint - Xx402-v2-mint-nasa-techport.vercel.appSearch & web
NASA TechPort R&D project search/detail (keyless). POST {projectId?} / {titleKeyword?|query?} / {updatedSince?} / {pageSize?}. Tight field projection. Empty → 400 not charged.
Basex402-v2-mint-nasa-techport.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-metmuseum-collection-search.vercel.appSearch & web
Met Museum collection search v1.1 (keyless). POST {q|query}/{hasImages?}/{limit?}. Empty -> 400 not charged.
Basex402-v2-mint-metmuseum-collection-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-lobsters-hottest.vercel.appSearch & web
Lobste.rs hottest.json tech-news feed (keyless). POST {limit?, tag?} (limit default 15 max 25). Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose hn-stories / bluesky-public-did.
Basex402-v2-mint-lobsters-hottest.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-launch-library-upcoming.vercel.appSearch & web
Launch Library 2 upcoming launches (keyless). POST {limit?} and/or {search?}/{lsp_id?}. Empty → 404 not charged.
Basex402-v2-mint-launch-library-upcoming.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-kitsu-anime-search.vercel.appSearch & web
Kitsu anime search (keyless JSON:API). POST {q|text|query} required; limit max 10. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose tvmaze-search (media). Jikan rejected (do not mint).
Basex402-v2-mint-kitsu-anime-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-itis-taxonomy-search.vercel.appSearch & web
ITIS US scientific-name taxonomy search (keyless, US-scoped). POST {q|name|scientificname}. Empty -> 400 not charged.
Basex402-v2-mint-itis-taxonomy-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-interpro-entry-search.vercel.appSearch & web
InterPro protein-domain entry search (keyless). POST {q|search}/{page_size?}. Empty -> 400 not charged. UniProt/PDBe adjacency disclosed.
Basex402-v2-mint-interpro-entry-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-internet-archive-search.vercel.appSearch & web
Internet Archive advancedsearch (keyless). POST {q|query}/{rows?}. Empty -> 400 not charged.
Basex402-v2-mint-internet-archive-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-inspirehep-literature.vercel.appSearch & web
INSPIRE-HEP literature search (keyless). POST {q|query} with optional {size?}. Empty → 400 not charged.
Basex402-v2-mint-inspirehep-literature.vercel.appfrom $0.021 endpoint - 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
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.