VouchSpec Agent Skill Evidence
Agent-only discovery for fresh, exact-commit Agent Skill validation. Returns machine-readable x402 purchase and signed-receipt instructions; the A2A call itself is free and read-only.
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://vouchspec.plyrium.com/api/vouchspec/v1/a2a
· transport JSONRPC
· protocol https://vouchspec.plyrium.com/api/vouchspec/v1/a2a
· transport JSONRPC
non-standard supportedInterfaces
Discover exact-commit Agent Skill validation discover_vouchspec_validation
Returns current request schema, x402 USDC payment instructions, delivery expectations, signed receipt verification, cache, sharing, and invalidation rules. It does not perform paid validation.
agent-skillsexact-commitevidencex402usdcbase2026-09-19 from https://vouchspec.plyrium.com/.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.