6 packages
@countersign/ap2
Govern AP2 (the Agent Payments Protocol) with Countersign — guard an agent's mandate against policy before it signs the PaymentMandate.
@countersign/api-contract
Countersign Core API contract — typed REST + ws schema and OpenAPI spec for the cross-vendor agent-spend control plane.
@countersign/mcp
Countersign as MCP tools — the cross-vendor kill switch + spend guard inside any MCP client (Claude, Cursor, …).
@countersign/sdk
Countersign SDK — the typed client agents and operators use to wire in the cross-vendor freeze, spend-guard, and live audit ledger. Browser + Node.
@countersign/verify
Verify a Countersign ledger entry offline: hash-chain recomputation, RFC 6962 Merkle inclusion, and Ed25519 signatures — zero hosted dependencies.
@countersign/x402
Govern x402 (HTTP-402 machine payments) with Countersign — guard an agent's payment against policy before it pays.