ToolVet
75trust / 100

Source

by chain.openverbs.com in Onchain & crypto

x402 APIPassing, checked 2 h ago

Get the verified Solidity/Vyper source code for a deployed contract by address, sourced from Sourcify. Returns every source file (path + content), the contract name, language, compiler version and compiler settings (optimizer, evmVersion) — the full human-readable source an agent needs to read, audit or feed to an LLM. Supports Ethereum, Base, Arbitrum, Optimism, Polygon. Unverified contracts return `verified:false`. Live reads with cache fallback.

POST
https://chain.openverbs.com/v1/source
Price
$0.006
per call in USDC
Uptime
100%
last 30 days
Response time
582 ms
670 ms slowest 5%
Last check
Passed
2 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

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

How to call it

POST https://chain.openverbs.com/v1/source

Each call costs $0.006 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://chain.openverbs.com/v1/source
content-type: application/json

{
  "address": "0x0000000000000000000000000000000000000001",
  "chain": "ethereum"
}

Parameters

ParameterTypeRequiredDescription
addressstringYesDeployed contract address.
chainstringNoEVM chain to query. One of: ethereum, base, arbitrum, optimism, polygon. Default "ethereum". One of: ethereum, base, arbitrum, optimism, polygon.

Example response

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

{
  "address": "0x0000000000000000000000000000000000000001",
  "chain": "ethereum",
  "chainId": 1,
  "compiler": null,
  "contractName": null,
  "fileCount": 0,
  "fullyQualifiedName": null,
  "language": null,
  "matchType": null,
  "settings": null,
  "sources": [],
  "stale": false,
  "totalBytes": 0,
  "truncated": false,
  "verified": false,
  "verifiedAt": null
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.006.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://chain.openverbs.com/v1/source' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x0000000000000000000000000000000000000001","chain":"ethereum"}'

# 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://chain.openverbs.com/v1/source' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x0000000000000000000000000000000000000001","chain":"ethereum"}' \
  | 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 $0.006 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.006" });
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 $0.006 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fchain.openverbs.com%2Fv1%2Fsource&method=POST
const res = await pay("https://chain.openverbs.com/v1/source", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x0000000000000000000000000000000000000001",
    "chain": "ethereum"
  }),
});
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 $0.006 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.006"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://chain.openverbs.com/v1/source",
        json={
            "address": "0x0000000000000000000000000000000000000001",
            "chain": "ethereum",
        },
    )
    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

WhenResultHTTPTimePrice
2 h agoPassed402594 ms$0.006
7 h agoPassed402594 ms$0.006
12 h agoPassed402652 ms$0.006
17 h agoPassed402619 ms$0.006
22 h agoPassed402631 ms$0.006
Show 10 older checks
26 h agoPassed402579 ms$0.006
31 h agoPassed402526 ms$0.006
36 h agoPassed402655 ms$0.006
40 h agoPassed402668 ms$0.006
44 h agoPassed402612 ms$0.006
2 days agoPassed402562 ms$0.006
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3 days agoPassed402593 ms$0.006