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Openapi Response Conformance Audit

by OpenAPI Response Audit in Onchain & crypto

x402 APIPassing, checked 4 h ago

Audit a real response against what the OpenAPI document promises for that operation. Resolves the declared status exactly, by range such as 2XX, or through default, checks declared response headers are present, and validates the body against the declared schema for its media type. Catches an implementation that has drifted from its own published contract.

POST
https://api.zfinia.com/x402/v1/openapi-response-conformance-audit
Price
$0.14
per call in USDC
Uptime
100%
last 30 days
Response time
502 ms
667 ms slowest 5%
Last check
Passed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://api.zfinia.com/x402/v1/openapi-response-conformance-audit

Each call costs $0.14 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://api.zfinia.com/x402/v1/openapi-response-conformance-audit
content-type: application/json

{
  "request": {
    "method": "GET",
    "path": "/orders/{id}"
  },
  "response": {
    "body": {
      "id": "o-1",
      "status": "cancelled",
      "total": "42.50"
    },
    "headers": {
      "Content-Type": "application/json"
    },
    "status": 200
  },
  "specification": {
    "components": {
      "schemas": {
        "Order": {
          "properties": {
            "id": {
              "type": "string"
            },
            "legacy_ref": {
              "type": "string"
            },
            "status": {
              "enum": [
                "open",
                "shipped"
              ],
              "type": "string"
            },
            "total": {
              "type": "number"
            }
          },
          "required": [
            "id",
            "total"
          ],
          "type": "object"
        }
      },
      "securitySchemes": {
        "apiKey": {
          "in": "header",
          "name": "X-Api-Key",
          "type": "apiKey"
        }
      }
    },
    "info": {
      "title": "Orders API",
      "version": "1.4.0"
    },
    "openapi": "3.1.0",
    "paths": {
      "/legacy/export": {
        "get": {
          "operationId": "legacyExport",
          "responses": {
            "200": {
              "description": "A CSV export"
            }
          },
          "summary": "Legacy export"
        }
      },
      "/orders": {
        "get": {
          "operationId": "listOrders",
          "responses": {
            "200": {
              "content": {
                "application/json": {
                  "schema": {
                    "items": {
                      "$ref": "#/components/schemas/Order"
                    },
                    "type": "array"
                  }
                }
              },
              "description": "A page of orders"
            },
            "429": {
              "description": "Rate limited"
            }
          },
          "summary": "List orders"
        },
        "parameters": [
          {
            "in": "query",
            "name": "page",
            "schema": {
              "minimum": 1,
              "type": "integer"
            }
          }
        ],
        "post": {
          "operationId": "createOrder",
          "requestBody": {
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/Order"
                }
              }
            }
          },
          "responses": {
            "201": {
              "content": {
                "application/json": {
                  "schema": {
                    "$ref": "#/components/schemas/Order"
                  }
                }
              },
              "description": "Created"
            }
          },
          "summary": "Create an order"
        }
      },
      "/orders/{id}": {
        "get": {
          "operationId": "getOrder",
          "parameters": [
            {
              "in": "path",
              "name": "id",
              "schema": {
                "type": "string"
              }
            }
          ],
          "responses": {
            "200": {
              "content": {
                "application/json": {
                  "schema": {
                    "$ref": "#/components/schemas/Order"
                  }
                }
              },
              "description": "The order"
            },
            "404": {
              "description": "Not found"
            }
          },
          "summary": "Fetch one order"
        }
      }
    },
    "security": [
      {
        "apiKey": []
      }
    ]
  }
}

Parameters

ParameterTypeRequiredDescription
requestobjectYes
responseobjectYes
specificationobjectYes

Example response

The provider's example. We can't check it without paying.

Example response, 48 lines
{
  "assumptions": [
    "A status may be declared exactly, as a range such as 2XX, or through default, and the most specific declaration is used.",
    "You supply the observed response, so this works against an API behind authentication or on a private network."
  ],
  "body_checked": true,
  "complete": true,
  "conformant": false,
  "finding_count": 2,
  "findings": [
    {
      "code": "TYPE_MISMATCH",
      "detail": "GET /orders/{id}: response body Expected number, found string.",
      "operation": "GET /orders/{id}",
      "pointer": "/total",
      "status": "200"
    },
    {
      "code": "NOT_IN_ENUM",
      "detail": "GET /orders/{id}: response body \"cancelled\" is not one of the 2 permitted values.",
      "operation": "GET /orders/{id}",
      "pointer": "/status",
      "status": "200"
    }
  ],
  "findings_by_code": {
    "NOT_IN_ENUM": 1,
    "TYPE_MISMATCH": 1
  },
  "limitations": [
    "Conformance of one response against the supplied specification. Whether the specification is correct is not assessed.",
    "conformant is true only when the operation and status were declared and every declared constraint was evaluated and passed."
  ],
  "limits": {
    "maxClientOperations": 200,
    "maxFindings": 500,
    "maxOperations": 500,
    "maxRequestBodyBytes": 262144
  },
  "matched_operation": "GET /orders/{id}",
  "matched_status_declaration": "200",
  "not_examined": [],
  "observed_at": "2026-10-02T00:00:00.000Z",
  "request_id": "example-request",
  "service_id": "openapi_response_conformance_audit",
  "service_version": "1.0.0",
  "status": 200
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.14.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.zfinia.com/x402/v1/openapi-response-conformance-audit' \
  -H 'content-type: application/json' \
  --data-raw '{"request":{"method":"GET","path":"/orders/{id}"},"response":{"body":{"id":"o-1","status":"cancelled","total":"42.50"},"headers":{"Content-Type":"application/json"},"status":200},"specification":{"components":{"schemas":{"Order":{"properties":{"id":{"type":"string"},"legacy_ref":{"type":"string"},"status":{"enum":["open","shipped"],"type":"string"},"total":{"type":"number"}},"required":["id","total"],"type":"object"}},"securitySchemes":{"apiKey":{"in":"header","name":"X-Api-Key","type":"apiKey"}}},"info":{"title":"Orders API","version":"1.4.0"},"openapi":"3.1.0","paths":{"/legacy/export":{"get":{"operationId":"legacyExport","responses":{"200":{"description":"A CSV export"}},"summary":"Legacy export"}},"/orders":{"get":{"operationId":"listOrders","responses":{"200":{"content":{"application/json":{"schema":{"items":{"$ref":"#/components/schemas/Order"},"type":"array"}}},"description":"A page of orders"},"429":{"description":"Rate limited"}},"summary":"List orders"},"parameters":[{"in":"query","name":"page","schema":{"minimum":1,"type":"integer"}}],"post":{"operationId":"createOrder","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Order"}}}},"responses":{"201":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Order"}}},"description":"Created"}},"summary":"Create an order"}},"/orders/{id}":{"get":{"operationId":"getOrder","parameters":[{"in":"path","name":"id","schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Order"}}},"description":"The order"},"404":{"description":"Not found"}},"summary":"Fetch one order"}}},"security":[{"apiKey":[]}]}}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://api.zfinia.com/x402/v1/openapi-response-conformance-audit' \
  -H 'content-type: application/json' \
  --data-raw '{"request":{"method":"GET","path":"/orders/{id}"},"response":{"body":{"id":"o-1","status":"cancelled","total":"42.50"},"headers":{"Content-Type":"application/json"},"status":200},"specification":{"components":{"schemas":{"Order":{"properties":{"id":{"type":"string"},"legacy_ref":{"type":"string"},"status":{"enum":["open","shipped"],"type":"string"},"total":{"type":"number"}},"required":["id","total"],"type":"object"}},"securitySchemes":{"apiKey":{"in":"header","name":"X-Api-Key","type":"apiKey"}}},"info":{"title":"Orders API","version":"1.4.0"},"openapi":"3.1.0","paths":{"/legacy/export":{"get":{"operationId":"legacyExport","responses":{"200":{"description":"A CSV export"}},"summary":"Legacy export"}},"/orders":{"get":{"operationId":"listOrders","responses":{"200":{"content":{"application/json":{"schema":{"items":{"$ref":"#/components/schemas/Order"},"type":"array"}}},"description":"A page of orders"},"429":{"description":"Rate limited"}},"summary":"List orders"},"parameters":[{"in":"query","name":"page","schema":{"minimum":1,"type":"integer"}}],"post":{"operationId":"createOrder","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Order"}}}},"responses":{"201":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Order"}}},"description":"Created"}},"summary":"Create an order"}},"/orders/{id}":{"get":{"operationId":"getOrder","parameters":[{"in":"path","name":"id","schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Order"}}},"description":"The order"},"404":{"description":"Not found"}},"summary":"Fetch one order"}}},"security":[{"apiKey":[]}]}}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.14 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.14" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.14 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.zfinia.com%2Fx402%2Fv1%2Fopenapi-response-conformance-audit&method=POST
const res = await pay("https://api.zfinia.com/x402/v1/openapi-response-conformance-audit", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "request": {
      "method": "GET",
      "path": "/orders/{id}"
    },
    "response": {
      "body": {
        "id": "o-1",
        "status": "cancelled",
        "total": "42.50"
      },
      "headers": {
        "Content-Type": "application/json"
      },
      "status": 200
    },
    "specification": {
      "components": {
        "schemas": {
          "Order": {
            "properties": {
              "id": {
                "type": "string"
              },
              "legacy_ref": {
                "type": "string"
              },
              "status": {
                "enum": [
                  "open",
                  "shipped"
                ],
                "type": "string"
              },
              "total": {
                "type": "number"
              }
            },
            "required": [
              "id",
              "total"
            ],
            "type": "object"
          }
        },
        "securitySchemes": {
          "apiKey": {
            "in": "header",
            "name": "X-Api-Key",
            "type": "apiKey"
          }
        }
      },
      "info": {
        "title": "Orders API",
        "version": "1.4.0"
      },
      "openapi": "3.1.0",
      "paths": {
        "/legacy/export": {
          "get": {
            "operationId": "legacyExport",
            "responses": {
              "200": {
                "description": "A CSV export"
              }
            },
            "summary": "Legacy export"
          }
        },
        "/orders": {
          "get": {
            "operationId": "listOrders",
            "responses": {
              "200": {
                "content": {
                  "application/json": {
                    "schema": {
                      "items": {
                        "$ref": "#/components/schemas/Order"
                      },
                      "type": "array"
                    }
                  }
                },
                "description": "A page of orders"
              },
              "429": {
                "description": "Rate limited"
              }
            },
            "summary": "List orders"
          },
          "parameters": [
            {
              "in": "query",
              "name": "page",
              "schema": {
                "minimum": 1,
                "type": "integer"
              }
            }
          ],
          "post": {
            "operationId": "createOrder",
            "requestBody": {
              "content": {
                "application/json": {
                  "schema": {
                    "$ref": "#/components/schemas/Order"
                  }
                }
              }
            },
            "responses": {
              "201": {
                "content": {
                  "application/json": {
                    "schema": {
                      "$ref": "#/components/schemas/Order"
                    }
                  }
                },
                "description": "Created"
              }
            },
            "summary": "Create an order"
          }
        },
        "/orders/{id}": {
          "get": {
            "operationId": "getOrder",
            "parameters": [
              {
                "in": "path",
                "name": "id",
                "schema": {
                  "type": "string"
                }
              }
            ],
            "responses": {
              "200": {
                "content": {
                  "application/json": {
                    "schema": {
                      "$ref": "#/components/schemas/Order"
                    }
                  }
                },
                "description": "The order"
              },
              "404": {
                "description": "Not found"
              }
            },
            "summary": "Fetch one order"
          }
        }
      },
      "security": [
        {
          "apiKey": []
        }
      ]
    }
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.14 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.14"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.zfinia.com/x402/v1/openapi-response-conformance-audit",
        json={
            "request": {
                "method": "GET",
                "path": "/orders/{id}",
            },
            "response": {
                "body": {
                    "id": "o-1",
                    "status": "cancelled",
                    "total": "42.50",
                },
                "headers": {
                    "Content-Type": "application/json",
                },
                "status": 200,
            },
            "specification": {
                "components": {
                    "schemas": {
                        "Order": {
                            "properties": {
                                "id": {
                                    "type": "string",
                                },
                                "legacy_ref": {
                                    "type": "string",
                                },
                                "status": {
                                    "enum": [
                                        "open",
                                        "shipped",
                                    ],
                                    "type": "string",
                                },
                                "total": {
                                    "type": "number",
                                },
                            },
                            "required": [
                                "id",
                                "total",
                            ],
                            "type": "object",
                        },
                    },
                    "securitySchemes": {
                        "apiKey": {
                            "in": "header",
                            "name": "X-Api-Key",
                            "type": "apiKey",
                        },
                    },
                },
                "info": {
                    "title": "Orders API",
                    "version": "1.4.0",
                },
                "openapi": "3.1.0",
                "paths": {
                    "/legacy/export": {
                        "get": {
                            "operationId": "legacyExport",
                            "responses": {
                                "200": {
                                    "description": "A CSV export",
                                },
                            },
                            "summary": "Legacy export",
                        },
                    },
                    "/orders": {
                        "get": {
                            "operationId": "listOrders",
                            "responses": {
                                "200": {
                                    "content": {
                                        "application/json": {
                                            "schema": {
                                                "items": {
                                                    "$ref": "#/components/schemas/Order",
                                                },
                                                "type": "array",
                                            },
                                        },
                                    },
                                    "description": "A page of orders",
                                },
                                "429": {
                                    "description": "Rate limited",
                                },
                            },
                            "summary": "List orders",
                        },
                        "parameters": [
                            {
                                "in": "query",
                                "name": "page",
                                "schema": {
                                    "minimum": 1,
                                    "type": "integer",
                                },
                            },
                        ],
                        "post": {
                            "operationId": "createOrder",
                            "requestBody": {
                                "content": {
                                    "application/json": {
                                        "schema": {
                                            "$ref": "#/components/schemas/Order",
                                        },
                                    },
                                },
                            },
                            "responses": {
                                "201": {
                                    "content": {
                                        "application/json": {
                                            "schema": {
                                                "$ref": "#/components/schemas/Order",
                                            },
                                        },
                                    },
                                    "description": "Created",
                                },
                            },
                            "summary": "Create an order",
                        },
                    },
                    "/orders/{id}": {
                        "get": {
                            "operationId": "getOrder",
                            "parameters": [
                                {
                                    "in": "path",
                                    "name": "id",
                                    "schema": {
                                        "type": "string",
                                    },
                                },
                            ],
                            "responses": {
                                "200": {
                                    "content": {
                                        "application/json": {
                                            "schema": {
                                                "$ref": "#/components/schemas/Order",
                                            },
                                        },
                                    },
                                    "description": "The order",
                                },
                                "404": {
                                    "description": "Not found",
                                },
                            },
                            "summary": "Fetch one order",
                        },
                    },
                },
                "security": [
                    {
                        "apiKey": [],
                    },
                ],
            },
        },
    )
    print(res.status_code, res.text)

Security scan

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