{
  "x402Version": 2,
  "id": 12354,
  "slug": "12354",
  "resource": "https://kairostamp.com/api/v1/verify",
  "description": "Receipt verification: read-only hash-chain verification of one existing Kairostamp receipt id. Recomputes the canonical SHA-256 digest, compares it with the stored chain hash, checks linkage to the preceding entry and reports whether the entry is covered by an on-chain checkpoint. Performs no outbound fetch. Single GET query parameter (receipt_id).",
  "type": "http",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0xdB6F694aE695C632C82677a50593B46137808453",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "1000",
      "maxTimeoutSeconds": 300
    }
  ],
  "outputSchema": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "receipt_id": "85cd424c-b68b-440e-8f4f-e02147799f30"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "anchor": {
              "chain_seq": 14,
              "covered": true,
              "network": "eip155:84532",
              "note": "Checkpoints record a chain hash only; anchoring is not a guarantee of availability, accuracy or legal effect.",
              "status": "confirmed"
            },
            "chain": {
              "chain_hash": "d084fff3e5d852089814f7d4d3ffe9d04d1a39ce9d2e0573a95f24cf78fb584d",
              "chain_seq": 12,
              "linked": true,
              "previous_chain_hash": "da27fe24efc04330962d1b95c7929a9de901ad0ea49a7997edf9f2731bf88def"
            },
            "codes": [],
            "exists": true,
            "method": "recomputed_digest",
            "receipt_id": "85cd424c-b68b-440e-8f4f-e02147799f30",
            "verdict": "valid"
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "additionalProperties": false,
                "examples": [
                  {
                    "receipt_id": "85cd424c-b68b-440e-8f4f-e02147799f30"
                  }
                ],
                "properties": {
                  "receipt_id": {
                    "description": "Identifier of a receipt previously returned by a Kairostamp paid endpoint. Sent as the `receipt_id` query parameter.",
                    "examples": [
                      "85cd424c-b68b-440e-8f4f-e02147799f30"
                    ],
                    "format": "uuid",
                    "type": "string"
                  }
                },
                "required": [
                  "receipt_id"
                ],
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "properties": {
                  "anchor": {
                    "properties": {
                      "chain_seq": {
                        "type": [
                          "integer",
                          "null"
                        ]
                      },
                      "covered": {
                        "description": "True when a checkpoint covers this entry.",
                        "type": "boolean"
                      },
                      "network": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "note": {
                        "type": "string"
                      },
                      "status": {
                        "type": [
                          "string",
                          "null"
                        ]
                      }
                    },
                    "required": [
                      "covered"
                    ],
                    "type": "object"
                  },
                  "chain": {
                    "properties": {
                      "chain_hash": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "chain_seq": {
                        "type": "integer"
                      },
                      "linked": {
                        "description": "True when the stored previous hash matches the preceding entry.",
                        "type": [
                          "boolean",
                          "null"
                        ]
                      },
                      "previous_chain_hash": {
                        "type": [
                          "string",
                          "null"
                        ]
                      }
                    },
                    "required": [
                      "chain_seq",
                      "chain_hash",
                      "previous_chain_hash",
                      "linked"
                    ],
                    "type": "object"
                  },
                  "codes": {
                    "items": {
                      "type": "string"
                    },
                    "type": "array"
                  },
                  "exists": {
                    "type": "boolean"
                  },
                  "method": {
                    "description": "Verification method used.",
                    "type": "string"
                  },
                  "receipt_id": {
                    "format": "uuid",
                    "type": "string"
                  },
                  "verdict": {
                    "description": "Result of recomputing the canonical digest for this entry.",
                    "enum": [
                      "valid",
                      "invalid",
                      "indeterminate",
                      "quarantined_legacy"
                    ],
                    "type": "string"
                  }
                },
                "required": [
                  "receipt_id",
                  "exists",
                  "verdict",
                  "chain"
                ],
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    },
    "builder-code": {
      "info": {
        "s": [
          "cdp_sdk_server"
        ]
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "additionalProperties": false,
        "properties": {
          "a": {
            "description": "App builder code",
            "pattern": "^[a-z0-9_]{1,32}$",
            "type": "string"
          },
          "s": {
            "description": "Service builder codes",
            "items": {
              "pattern": "^[a-z0-9_]{1,32}$",
              "type": "string"
            },
            "maxItems": 11,
            "type": "array"
          },
          "w": {
            "description": "Wallet builder code",
            "pattern": "^[a-z0-9_]{1,32}$",
            "type": "string"
          }
        },
        "type": "object"
      }
    },
    "eip2612GasSponsoring": {},
    "erc20ApprovalGasSponsoring": {}
  },
  "tags": [
    "bazaar",
    "builder-code",
    "eip2612GasSponsoring",
    "erc20ApprovalGasSponsoring"
  ],
  "sourceHost": "kairostamp.com",
  "lastUpdated": "2026-08-23T09:07:59.905Z",
  "quality": {
    "calls30d": 1,
    "uniquePayers30d": 1,
    "lastCalledAt": "2026-08-23T09:07:58.718Z"
  },
  "liveness": {},
  "verified": false,
  "featured": false,
  "provider": {
    "host": "kairostamp.com",
    "manifest_name": "kairostamp.com",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-09-18T22:00:31.484Z"
  }
}