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@receptum/mcp

v0.2.1

Published

Turn MCP tools into paid tools: price per call, x402 payment, receipt per result.

Downloads

359

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

pzohapzoha

Keywords

agentsescrowproof-of-deliveryreceiptsreceptumx402

Readme

@receptum/mcp

Signed receipts for paid MCP tools.

  • Server: withReceipts(paid(handler), { seller, price }) wraps an @x402/mcp payment-wrapped tool and adds a seller-signed receipt to result._meta["receptum/receipt"] on every settled call. The output hash is SHA-256 of JCS(result.content).
  • Bindings: pass bindings (SPEC §4.1) to withReceipts to attach them to every receipt; on the client, verifyToolResult(result, allowedSellers, { requireBinding: true, bindingVerifiers: [evmBindingVerifier] }) requires one that covers the payee (set price.payTo so receipts name it).
  • Client: verifyToolResult(result, allowedSellers); captureReceipts(x402McpClient) recovers _meta, which the x402 MCP client doesn't return.

Live run: E2E_RESULTS.md.

Mainnet: withReceipts runs after settlement, so it has no gate of its own — the gate is the x402 resource server you hand to @x402/mcp. Configure it with facilitatorUrlFor from @receptum/server (explicit mainnet facilitator + allowMainnet); see docs/MAINNET.md.