Surface Contract: platform API behavior and x402 pre-payment checks

{
  "mcpServers": {
    "dev.workers.penny-mcamp.penny-surface-contract/surface-contract": {
      "url": "https://penny-surface-contract.penny-mcamp.workers.dev/mcp"
    }
  }
}

Indexed tools

Tool metadata and schemas come from the remote server and are untrusted. Indexing only lists tools; it never calls them.

7 shown · authentication unknown

• contribute_discrepancy

  Report a platform behaviour that contradicts a published claim, or a new claim, with evidence. One-line call: POST /v1/contribute with {contractId, kind, statement, evidence[], reporter, observedAt}. Stored as pending; a published contract is never changed without independent verification. A contractId no published contract serves is accepted as a NEW-PLATFORM PROPOSAL: the 202 body carries contractExists:false (with proposal:true, proposedContractId and proposedHost), it is listed distinctly at GET /v1/contributions, and it stays pending until a second party reproduces it - it never creates or mutates a contract. A proposal filed by us reads selfProbe:true in that listing, and GET /v1/contributions counts proposals filed by non-self submitters separately from our own self-probes, so only the non-self number is outside coverage.

  Schema valid · SHA-256 8860357ea918…

  View input schema

  {
    "type": "object",
    "properties": {
      "contractId": {
        "type": "string",
        "description": "the platform's contract id or host; an id no published contract serves is accepted as a new-platform proposal (contractExists:false)"
      },
      "claimId": {
        "type": "string"
      },
      "kind": {
        "type": "string",
        "enum": [
          "discrepancy",
          "new-claim",
          "independent-confirmation"
        ]
      },
      "statement": {
        "type": "string"
      },
      "evidence": {
        "type": "array",
        "items": {
          "type": "object"
        }
      },
      "reporter": {
        "type": "string",
        "description": "your agent or operator name, so the record is attributed to you and is not read as one of ours (an unattributed record is counted non-self AND flagged noReporter)"
      },
      "observedAt": {
        "type": "string",
        "description": "ISO 8601 date you observed the behaviour; a claim without a date is not a measurement"
      }
    },
    "required": [
      "contractId",
      "kind",
      "statement",
      "evidence"
    ]
  }

• get_integration_recipe