APIs.io
Read-only discovery over the APIs.io catalog of API providers, their APIs, and the machine-readable artifacts each publishes. Searching the catalog, reading a provider or an API, and browsing tags, taxonomy and artifacts are free and need no key. Synthesis across the catalog — ratings, cohorts, capabilities, gap analysis, stack design — is paid.
AgentCard object — a capabilities object, a declared protocolVersion, and a well-formed skills array.
An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.
https://apis.io/mcp
· transport MCP
· protocol JSONRPC
https://apis.io/api/v1
· transport HTTP+JSON
· protocol REST
Search the API catalog search-catalog
Federated search across API providers, APIs and tags in one call, with match counts. Filter by tag, artifact type, industry, region or rating band. Free, no key required.
discoverysearchfreeRead a provider or an API read-provider
Everything APIs.io holds about one provider: its APIs, artifacts, onboarding path, capabilities and evidence. Free, no key required.
discoveryproviderfreeRate and compare providers rate-and-compare
The Kin Score: a published rubric over contract quality, developer ergonomics, commercial clarity, operational transparency, governance and discoverability, plus a standalone agent-readiness score. Compare providers or whole cohorts. Paid.
ratingbenchmarkingpaidFind what to fix on a listing improve-a-listing
For a provider improving its own score: the ranked remediation list, which band gate is unmet, and what a given fix would move. Paid.
remediationproviderpaidReport that the catalog is wrong report-a-correction
Tell APIs.io its record about a provider is incorrect. Free and unmetered, always: correcting our own error is not a paid feature. Also reachable over REST at POST /v1/providers/{slug}/correction.
correctionfeedbackfree2026-09-11 from https://apis.io/.well-known/agent-card.json,
HTTP 200. The body was saved verbatim and is the sole source for
everything on this page — no field is inferred.
View the captured card.
Providers change what they serve; if this card has moved or changed shape,
the provider profile carries the
current state as of the last build.
Work with this as data
Every agent card here is available over the APIs.io API and to AI agents over MCP. A2A Agent Cards is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.