ToolVet
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Openapi Breaking Change

by Forest Web in Onchain & crypto

x402 APIPassing, checked 1 h ago

Compare two public OpenAPI or Swagger contracts and determine whether the API update contains directly observable breaking compatibility changes. Detects removed operations, newly required request inputs, narrowed inline enums, removed content types or successful responses and tightened authentication; unsupported compatibility questions remain unknown. No API operation is executed. Base mainnet USDC

POST https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi/breaking-change

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
99 ms typical, 252 ms slowest 5%
Last check
1 h ago
Next check
any minute now

How to call it

POST https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi/breaking-change

Each call costs $0.004 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://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi/breaking-change
content-type: application/json

{
  "after_url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json",
  "before_url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json"
}

Parameters

ParameterTypeRequiredDescription
after_urlstringYesPublic after url value used to scope this lookup.
before_urlstringYesPublic before url value used to scope this lookup.

Example response

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

Example response, 31 lines
{
  "capability": "openapi.breaking-change",
  "data": {
    "after_fingerprint_scope": "machine_contract_structure",
    "after_hash": "0000000000000000000000000000000000000000000000000000000000000000",
    "after_operation_count": 0,
    "after_url": "example",
    "before_fingerprint_scope": "machine_contract_structure",
    "before_hash": "0000000000000000000000000000000000000000000000000000000000000000",
    "before_operation_count": 0,
    "before_url": "example",
    "breaking_changes": [],
    "comparison_complete": false,
    "comparison_truncated": false,
    "local_ref_count": 0,
    "non_breaking_changes": [],
    "provider_request_count": 2,
    "remote_ref_count": 0,
    "scope": "two_bounded_openapi_documents_no_operation_execution_no_ref_resolution",
    "unknown_changes": [],
    "verdict": "unchanged"
  },
  "meta": {
    "cache": "miss",
    "checked_at": "2026-01-01T00:00:00.000Z",
    "duration_ms": 0,
    "provider": "openapi-parser"
  },
  "ok": true,
  "version": "1"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.004.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi/breaking-change' \
  -H 'content-type: application/json' \
  --data-raw '{"after_url":"https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json","before_url":"https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json"}'

# 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://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi/breaking-change' \
  -H 'content-type: application/json' \
  --data-raw '{"after_url":"https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json","before_url":"https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json"}' \
  | 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 $0.004 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.004" });
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 $0.004 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fhttp--forest-gas-station-mainnet--lcjl27p8lmjs.code.run%2Fopenapi%2Fbreaking-change&method=POST
const res = await pay("https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi/breaking-change", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "after_url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json",
    "before_url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json"
  }),
});
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 $0.004 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.004"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi/breaking-change",
        json={
            "after_url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json",
            "before_url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/openapi.json",
        },
    )
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

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