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Openapi Mock Response

by OpenAPI mock response generator in Documents & files

x402 APIPassing, checked 3 h ago

Synthesize a JSON response body for one operation + status code in an OpenAPI 3.x or Swagger 2.x spec. Locate the operation by operationId or method+path. Pick the response by explicit `status`, else the first 2xx, else the first documented response. Generation precedence: operation-level `example`/`examples` > schema `example` > recursive type-inferred walk (objects walk properties, arrays return [mock(items)], enums return the first value, $ref is surfaced literally).

POST
https://agent402.tools/api/openapi-mock-response
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
315 ms
505 ms slowest 5%
Last check
Passed
3 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://agent402.tools/api/openapi-mock-response

Each call costs $0.001 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://agent402.tools/api/openapi-mock-response
content-type: application/json

{
  "operationId": "getUser",
  "spec": {
    "openapi": "3.0.0",
    "paths": {
      "/users/{id}": {
        "get": {
          "operationId": "getUser",
          "responses": {
            "200": {
              "content": {
                "application/json": {
                  "schema": {
                    "properties": {
                      "active": {
                        "example": true,
                        "type": "boolean"
                      },
                      "id": {
                        "example": "u_42",
                        "type": "string"
                      },
                      "name": {
                        "example": "Alice",
                        "type": "string"
                      },
                      "roles": {
                        "items": {
                          "example": "admin",
                          "type": "string"
                        },
                        "type": "array"
                      }
                    },
                    "type": "object"
                  }
                }
              },
              "description": "ok"
            }
          }
        }
      }
    }
  }
}

Parameters

ParameterTypeRequiredDescription
methodanyNoHTTP method (use with `path` if no operationId)
operationIdanyNooperationId to mock (preferred)
pathanyNoPath template (use with `method` if no operationId)
specanyYesOpenAPI/Swagger document (object or JSON string)
statusanyNoResponse status to mock (defaults to first 2xx)

Example response

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

{
  "contentType": "application/json",
  "mock": {
    "active": true,
    "id": "u_42",
    "name": "Alice",
    "roles": [
      "admin"
    ]
  },
  "source": "generated",
  "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 $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent402.tools/api/openapi-mock-response' \
  -H 'content-type: application/json' \
  --data-raw '{"operationId":"getUser","spec":{"openapi":"3.0.0","paths":{"/users/{id}":{"get":{"operationId":"getUser","responses":{"200":{"content":{"application/json":{"schema":{"properties":{"active":{"example":true,"type":"boolean"},"id":{"example":"u_42","type":"string"},"name":{"example":"Alice","type":"string"},"roles":{"items":{"example":"admin","type":"string"},"type":"array"}},"type":"object"}}},"description":"ok"}}}}}}}'

# 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://agent402.tools/api/openapi-mock-response' \
  -H 'content-type: application/json' \
  --data-raw '{"operationId":"getUser","spec":{"openapi":"3.0.0","paths":{"/users/{id}":{"get":{"operationId":"getUser","responses":{"200":{"content":{"application/json":{"schema":{"properties":{"active":{"example":true,"type":"boolean"},"id":{"example":"u_42","type":"string"},"name":{"example":"Alice","type":"string"},"roles":{"items":{"example":"admin","type":"string"},"type":"array"}},"type":"object"}}},"description":"ok"}}}}}}}' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fopenapi-mock-response&method=POST
const res = await pay("https://agent402.tools/api/openapi-mock-response", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "operationId": "getUser",
    "spec": {
      "openapi": "3.0.0",
      "paths": {
        "/users/{id}": {
          "get": {
            "operationId": "getUser",
            "responses": {
              "200": {
                "content": {
                  "application/json": {
                    "schema": {
                      "properties": {
                        "active": {
                          "example": true,
                          "type": "boolean"
                        },
                        "id": {
                          "example": "u_42",
                          "type": "string"
                        },
                        "name": {
                          "example": "Alice",
                          "type": "string"
                        },
                        "roles": {
                          "items": {
                            "example": "admin",
                            "type": "string"
                          },
                          "type": "array"
                        }
                      },
                      "type": "object"
                    }
                  }
                },
                "description": "ok"
              }
            }
          }
        }
      }
    }
  }),
});
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agent402.tools/api/openapi-mock-response",
        json={
            "operationId": "getUser",
            "spec": {
                "openapi": "3.0.0",
                "paths": {
                    "/users/{id}": {
                        "get": {
                            "operationId": "getUser",
                            "responses": {
                                "200": {
                                    "content": {
                                        "application/json": {
                                            "schema": {
                                                "properties": {
                                                    "active": {
                                                        "example": True,
                                                        "type": "boolean",
                                                    },
                                                    "id": {
                                                        "example": "u_42",
                                                        "type": "string",
                                                    },
                                                    "name": {
                                                        "example": "Alice",
                                                        "type": "string",
                                                    },
                                                    "roles": {
                                                        "items": {
                                                            "example": "admin",
                                                            "type": "string",
                                                        },
                                                        "type": "array",
                                                    },
                                                },
                                                "type": "object",
                                            },
                                        },
                                    },
                                    "description": "ok",
                                },
                            },
                        },
                    },
                },
            },
        },
    )
    print(res.status_code, res.text)

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