ToolVet
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Openapi Validate Payload

by OpenAPI payload validator in Other

x402 APIPassing, checked 3 h ago

Validate a JSON payload against the request or response schema for one operation in an OpenAPI 3.x or Swagger 2.x spec. Locate the operation by operationId or method+path; choose `part: "request"` or `part: "response"` (status defaults to the first 2xx). Deterministic subset of JSON Schema: type, required, enum, properties, items, additionalProperties:false, oneOf/anyOf/allOf, $ref-detection (not dereferenced).

POST
https://agent402.tools/api/openapi-validate-payload
Price
$0.001
per call in USDC
Uptime
98.1%
last 30 days
Response time
269 ms
375 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-validate-payload

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-validate-payload
content-type: application/json

{
  "operationId": "createUser",
  "part": "request",
  "payload": {
    "age": "thirty",
    "extra": "noise",
    "name": "Alice"
  },
  "spec": {
    "openapi": "3.0.0",
    "paths": {
      "/users": {
        "post": {
          "operationId": "createUser",
          "requestBody": {
            "content": {
              "application/json": {
                "schema": {
                  "additionalProperties": false,
                  "properties": {
                    "age": {
                      "type": "integer"
                    },
                    "email": {
                      "type": "string"
                    },
                    "name": {
                      "type": "string"
                    },
                    "role": {
                      "enum": [
                        "admin",
                        "user"
                      ],
                      "type": "string"
                    }
                  },
                  "required": [
                    "name",
                    "email"
                  ],
                  "type": "object"
                }
              }
            }
          },
          "responses": {
            "201": {
              "description": "ok"
            }
          }
        }
      }
    }
  }
}

Parameters

ParameterTypeRequiredDescription
methodanyNoHTTP method (use with `path` if no operationId)
operationIdanyNooperationId to validate against (preferred)
partanyYesSchema to validate against: "request" or "response"
pathanyNoPath template (use with `method` if no operationId)
payloadanyYesJSON value to validate
specanyYesOpenAPI/Swagger document (object or JSON string)
statusanyNoResponse status when part="response" (defaults to first 2xx)

Example response

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

{
  "errors": [
    {
      "message": "missing required field: email",
      "path": "",
      "rule": "required"
    },
    {
      "message": "expected integer, got string",
      "path": ".age",
      "rule": "type"
    },
    {
      "message": "unexpected property: extra",
      "path": ".extra",
      "rule": "additionalProperties"
    }
  ],
  "schemaPresent": true,
  "valid": false
}

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-validate-payload' \
  -H 'content-type: application/json' \
  --data-raw '{"operationId":"createUser","part":"request","payload":{"age":"thirty","extra":"noise","name":"Alice"},"spec":{"openapi":"3.0.0","paths":{"/users":{"post":{"operationId":"createUser","requestBody":{"content":{"application/json":{"schema":{"additionalProperties":false,"properties":{"age":{"type":"integer"},"email":{"type":"string"},"name":{"type":"string"},"role":{"enum":["admin","user"],"type":"string"}},"required":["name","email"],"type":"object"}}}},"responses":{"201":{"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-validate-payload' \
  -H 'content-type: application/json' \
  --data-raw '{"operationId":"createUser","part":"request","payload":{"age":"thirty","extra":"noise","name":"Alice"},"spec":{"openapi":"3.0.0","paths":{"/users":{"post":{"operationId":"createUser","requestBody":{"content":{"application/json":{"schema":{"additionalProperties":false,"properties":{"age":{"type":"integer"},"email":{"type":"string"},"name":{"type":"string"},"role":{"enum":["admin","user"],"type":"string"}},"required":["name","email"],"type":"object"}}}},"responses":{"201":{"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-validate-payload&method=POST
const res = await pay("https://agent402.tools/api/openapi-validate-payload", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "operationId": "createUser",
    "part": "request",
    "payload": {
      "age": "thirty",
      "extra": "noise",
      "name": "Alice"
    },
    "spec": {
      "openapi": "3.0.0",
      "paths": {
        "/users": {
          "post": {
            "operationId": "createUser",
            "requestBody": {
              "content": {
                "application/json": {
                  "schema": {
                    "additionalProperties": false,
                    "properties": {
                      "age": {
                        "type": "integer"
                      },
                      "email": {
                        "type": "string"
                      },
                      "name": {
                        "type": "string"
                      },
                      "role": {
                        "enum": [
                          "admin",
                          "user"
                        ],
                        "type": "string"
                      }
                    },
                    "required": [
                      "name",
                      "email"
                    ],
                    "type": "object"
                  }
                }
              }
            },
            "responses": {
              "201": {
                "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-validate-payload",
        json={
            "operationId": "createUser",
            "part": "request",
            "payload": {
                "age": "thirty",
                "extra": "noise",
                "name": "Alice",
            },
            "spec": {
                "openapi": "3.0.0",
                "paths": {
                    "/users": {
                        "post": {
                            "operationId": "createUser",
                            "requestBody": {
                                "content": {
                                    "application/json": {
                                        "schema": {
                                            "additionalProperties": False,
                                            "properties": {
                                                "age": {
                                                    "type": "integer",
                                                },
                                                "email": {
                                                    "type": "string",
                                                },
                                                "name": {
                                                    "type": "string",
                                                },
                                                "role": {
                                                    "enum": [
                                                        "admin",
                                                        "user",
                                                    ],
                                                    "type": "string",
                                                },
                                            },
                                            "required": [
                                                "name",
                                                "email",
                                            ],
                                            "type": "object",
                                        },
                                    },
                                },
                            },
                            "responses": {
                                "201": {
                                    "description": "ok",
                                },
                            },
                        },
                    },
                },
            },
        },
    )
    print(res.status_code, res.text)

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