538 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Use when an agent needs x402 market totals. Returns market size: sellers listed by source and evidence (how many P0 has read itself), plus 30-day market totals from x402stats (CC BY 4.0), with attribution and a receipt
Look up a transaction on Base by hash. POST {"hash":"0x..."} and receive its status, block number, from and to addresses, value, gas used and effective gas price. Returns a clear not-found rather than an empty object whe...
Looks up a named entity or topic and returns a short factual summary, description and source URL as JSON. Price is 0.005 USDC per call.
Paid ISBN book lookup and edition record (cycle 230, x402 $0.01) - GET ?isbn=<ISBN10_OR_13> OR ?key=<OL_EDITION_KEY> OR ?sample=1|2|3 OR POST application/json {isbn|key}. KEYLESS Open Library isbn.json / works API -- no...
Paid ISBN book lookup and edition record (cycle 230, x402 $0.01) - GET ?isbn=<ISBN10_OR_13> OR ?key=<OL_EDITION_KEY> OR ?sample=1|2|3 OR POST application/json {isbn|key}. KEYLESS Open Library isbn.json / works API -- no...
Paid ISBN book lookup and edition record (cycle 230, x402 $0.01) - GET ?isbn=<ISBN10_OR_13> OR ?key=<OL_EDITION_KEY> OR ?sample=1|2|3 OR POST application/json {isbn|key}. KEYLESS Open Library isbn.json / works API -- no...
Paid ISBN book lookup and edition record (cycle 230, x402 $0.01) - GET ?isbn=<ISBN10_OR_13> OR ?key=<OL_EDITION_KEY> OR ?sample=1|2|3 OR POST application/json {isbn|key}. KEYLESS Open Library isbn.json / works API -- no...
Paid ISBN book lookup and edition record (cycle 230, x402 $0.01) - GET ?isbn=<ISBN10_OR_13> OR ?key=<OL_EDITION_KEY> OR ?sample=1|2|3 OR POST application/json {isbn|key}. KEYLESS Open Library isbn.json / works API -- no...
Look up a domain's public DNS records in one call: A and AAAA with TTLs, MX priority-sorted, TXT, NS, CNAME, SOA and CAA. Input: a bare domain name such as example.com. Errors for invalid domains or domains with no recor...
CNAME record of imap.<domain>: looks up the imap host under the domain you give (CNAME via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like imap without enum...
TXT record of remote.<domain>: looks up the remote host under the domain you give (TXT via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like remote without en...
TLSA records for a domain as answered by NextDNS (DNS over HTTPS): the records, TTL, response code (NOERROR/NXDOMAIN/SERVFAIL), whether the resolver validated DNSSEC, and the resolver's answer time. Compare resolvers to...
Book lookup by ISBN: title, authors, publish date, publisher, page count, subjects, cover image and Open Library link, from the free Open Library API. Cataloguing and citation data. $0.01 per lookup.
Book search across Open Library: up to 10 results with title, authors, first publish year, edition count, ISBNs and cover. Find the right edition or reading list fast. $0.01 per search.
GitHub repository info: description, stars, forks, open issues, primary language, license, default branch, topics, created/updated/pushed dates, archived flag and homepage, from the public GitHub API (no token; rate-limi...
Wikipedia search: the top 10 matching articles with title, snippet, word count and URL. Find the right article before pulling a summary. $0.01 per search.
MIME type reference: list all types in a category (image, audio, video, text, application, font, office), or look up a single file extension or MIME type to get its counterpart. 100+ mappings for setting Content-Type cor...
IETF RFC lookup by number: title, authors, publication date, status (Internet Standard, Proposed Standard, Informational...), page count, obsoletes/obsoleted-by/updates relations, keywords, abstract, and links to the HTM...
DNS lookup for any domain in one call: A records (IPv4), MX records with priority, all TXT records, the inferred mail provider, and whether SPF and DMARC records exist. Fast DNS-over-HTTPS resolution, JSON output, no API...
DNS A record lookup: resolve a domain name to its IPv4 addresses with TTL, record count, DNSSEC validation flag and response code, via DNS-over-HTTPS. Fast, no API key. $0.01 per lookup.
All common DNS records for a domain in one call: A, AAAA, MX, TXT, NS, SOA, CNAME, CAA and HTTPS, plus DNSSEC validation state. A complete DNS snapshot for audits, migrations and change tracking. $0.01 per domain.
DNS CNAME record lookup for a hostname: the alias target chain, TTL, and a dangling-CNAME check (target does not resolve, a subdomain-takeover risk indicator). Asset inventory and security hygiene. $0.01 per lookup.
DNS MX record lookup: the mail exchanger hosts and priorities for a domain, TTL, plus the detected mail provider (Google, Microsoft 365, Proofpoint, Zoho...). Email routing and provider identification. $0.01 per lookup.
DNS NS record lookup: the authoritative nameservers for a domain and the detected DNS hosting provider (Cloudflare, Route 53, Google Cloud DNS, Azure, NS1, GoDaddy, Namecheap...). Infrastructure discovery and migration c...