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mirrored listing x402 eip155:8453

Receipt verification: read-only hash-chain verification of one existing Kairostamp receipt

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).

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1000 (raw units)
price
1
calls / 30d
1
unique payers
2026-08-23
updated

Provider

kairostamp.com · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xdB6F694aE695C632C82677a50593B46137808453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "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": {}
}

Use it

curl

curl "https://kairostamp.com/api/v1/verify"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://kairostamp.com/api/v1/verify");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://kairostamp.com/api/v1/verify")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/12354.json, and this resource appears in /discovery/resources and /discovery/search.