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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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379 results- 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 - 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-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-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-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-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-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-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-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-encode-search.vercel.appSearch & web
ENCODE genomics experiment/search (keyless). POST {q|query|searchTerm}/{limit?}. Empty -> 400 not charged.
Basex402-v2-mint-encode-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-dryad-datasets.vercel.appSearch & web
Dryad research datasets search (keyless). POST {q|query} with optional {per_page?}. Empty → 400 not charged.
Basex402-v2-mint-dryad-datasets.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-doaj-articles.vercel.appSearch & web
DOAJ open-access articles search (keyless). POST {q|query} / {pageSize?}. Empty → 400 not charged.
Basex402-v2-mint-doaj-articles.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-digitalnz-search.vercel.appSearch & web
DigitalNZ cultural heritage records (keyless). POST {text}/{q?}/{per_page?}. Empty -> 400 not charged. europeana/LoC/IA adjacency disclosed.
Basex402-v2-mint-digitalnz-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-dataverse-dataset-search.vercel.appSearch & web
Harvard Dataverse dataset search (keyless). POST {q|query}/{per_page?}. Empty -> 400 not charged.
Basex402-v2-mint-dataverse-dataset-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-dataeuropa-ds.vercel.appSearch & web
data.europa.eu hub dataset search (keyless). POST {q}/{limit?}. Empty -> 400 not charged. humdata/dataverse/canada-od adjacency disclosed.
Basex402-v2-mint-dataeuropa-ds.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-data-gouv-datasets.vercel.appSearch & web
data.gouv.fr datasets search (keyless). POST {q}/{page?}/{page_size?}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Disclose adjacency: eurostat-dataset (FR open data catalog ≠ Eurostat SDMX).
Basex402-v2-mint-data-gouv-datasets.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-dailymed-spl-search.vercel.appSearch & web
DailyMed SPL label search (keyless; disclose openfda/RxNorm adjacency — DailyMed ≠ openfda wrap). POST {q|drug_name}/{pagesize?}. Empty -> 400 not charged.
Basex402-v2-mint-dailymed-spl-search.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-crt-sh-ct-lookup.vercel.appSearch & web
crt.sh Certificate Transparency search (keyless). POST {q} required. Empty -> 400 not charged. Distinct CT/PKI lane — disclose security adjacency vs openssf/osv/nvd.
Basex402-v2-mint-crt-sh-ct-lookup.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-crossref-works.vercel.appSearch & web
Crossref works search (keyless). POST {query} with optional {rows?} or {doi}. Empty → 404 not charged.
Basex402-v2-mint-crossref-works.vercel.appfrom $0.021 endpoint - Xx402-v2-mint-crossref-members.vercel.appSearch & web
Crossref members search (keyless). POST {q|query}/{rows?}. Empty -> 400 not charged. Crossref works/journals/funders adjacency disclosed.
Basex402-v2-mint-crossref-members.vercel.appfrom $0.021 endpoint
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