ToolVet
78trust / 100

Chains Contracts

by TraceFast in Onchain & crypto

x402 APIPassing, checked 3 h ago

TraceFast live Ethereum data: one deployed contract — the hash and size of its current code, what the code exposes (ERC-20 view functions, ERC-165, an EIP-1167 minimal proxy and its target), the proxy pattern detected in it, and its lifecycle: the deploying account, the origin account, the creating transaction, code changes and self-destruction. Path address: The contract address, `0x`-prefixed, 40 hex characters, any case. Docs: https://docs.tracefast.xyz/api/contract.md

GET
https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
132 ms
575 ms slowest 5%
Last check
Passed
3 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

GET https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address

Each call costs $0.005 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.

GET https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address

Example response

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

Example response, 35 lines
{
  "data": {
    "address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
    "blockNumber": 4634748,
    "bytecodeSize": 11075,
    "bytecodeVariant": "legacy_analyzed",
    "chainId": 1,
    "codeHash": "0xb44fb4e949d0f78f87f79ee46428f23a2a5713ce6fc6e0beb3dda78c2ac1ea55",
    "erc20Interface": {
      "hasDecimals": true,
      "hasName": true,
      "hasSymbol": true,
      "hasTotalSupply": true
    },
    "isEip1167Proxy": false,
    "isErc165": false,
    "isErc20": true,
    "lifecycle": {
      "codeChangeCount": 1,
      "deployBlock": 4634748,
      "deployCallType": "CREATE",
      "deployCodeHash": "0xb44fb4e949d0f78f87f79ee46428f23a2a5713ce6fc6e0beb3dda78c2ac1ea55",
      "deployTxHash": "0x2f1c5c2b44f771e942a8506148e256f94f1a464babc938ae0690c6e34cd79190",
      "deployTxIndex": 64,
      "deployer": "0x36928500bc1dcd7af6a2b4008875cc336b927d57",
      "isAlive": true,
      "latestCodeBlock": 4634748,
      "latestCodeHash": "0xb44fb4e949d0f78f87f79ee46428f23a2a5713ce6fc6e0beb3dda78c2ac1ea55",
      "origin": "0x36928500bc1dcd7af6a2b4008875cc336b927d57"
    },
    "proxyConfidence": 0,
    "proxyFamily": "none",
    "selectorCount": 36
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address'

# 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 - 'https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmpp.tracefast.xyz%2Fapi%2Fv1%2Fchains%2F1%2Fcontracts%2F%3Aaddress
const res = await pay("https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address");
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address")
    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
3 h agoPassed40255 ms$0.005
7 h agoPassed402193 ms$0.005
11 h agoPassed402502 ms$0.005
15 h agoPassed402575 ms$0.005
19 h agoPassed40255 ms$0.005
Show 10 older checks
24 h agoPassed402174 ms$0.005
28 h agoPassed402443 ms$0.005
32 h agoPassed402132 ms$0.005
36 h agoPassed402459 ms$0.005
40 h agoPassed402264 ms$0.005
44 h agoPassed402120 ms$0.005
2 days agoPassed402104 ms$0.005
2 days agoPassed402133 ms$0.005
2 days agoPassed402501 ms$0.005
2 days agoPassed402345 ms$0.005

History

12 Oct 2026Price changed from $0.01 to $0.005