ToolVet
77trust / 100

Contracts Proxy

by TraceFast in Onchain & crypto

x402 APIPassing, checked 3 h ago

TraceFast live Ethereum data: the implementations a proxy contract has been observed delegating to — from its EIP-1167 bytecode, its EIP-1967 implementation or beacon slot, or its OpenZeppelin v1 slot — newest first, each with the blocks it was seen at and whether it has since been replaced. Path address: The proxy contract address, `0x`-prefixed, 40 hex characters, any case. Docs: https://docs.tracefast.xyz/api/contract-proxy.md

GET
https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address/proxy
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
338 ms
562 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/proxy

Each call costs $0.01 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/proxy

Example response

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

{
  "data": {
    "address": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
    "chainId": 1,
    "implementations": [
      {
        "confidence": 1,
        "firstSeenBlock": 18963716,
        "implementation": "0x43506849d7c04f9138d1a2050bbf3a0c054402dd",
        "isSelfDelegation": false,
        "lastSeenBlock": 18963716,
        "proxyFamily": "unknown",
        "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3",
        "slotLastEvent": {
          "blockNumber": 18963716,
          "kind": "upgrade",
          "txHash": "0xae3ad89e569f27d47a8a02999a6d937c12aaa6bc50e66650e7cbd3244bde9951"
        },
        "source": "storage_oz_v1",
        "supersededBy": 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 $0.01.

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/proxy'

# 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/proxy' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmpp.tracefast.xyz%2Fapi%2Fv1%2Fchains%2F1%2Fcontracts%2F%3Aaddress%2Fproxy
const res = await pay("https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address/proxy");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
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/proxy")
    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 agoPassed402342 ms$0.01
7 h agoPassed402340 ms$0.01
11 h agoPassed402221 ms$0.01
16 h agoPassed402398 ms$0.01
20 h agoPassed402181 ms$0.01
Show 10 older checks
24 h agoPassed402117 ms$0.01
28 h agoPassed40239 ms$0.01
32 h agoPassed402438 ms$0.01
37 h agoPassed402363 ms$0.01
41 h agoPassed402338 ms$0.01
45 h agoPassed402378 ms$0.01
2 days agoPassed402308 ms$0.01
2 days agoPassed402501 ms$0.01
2 days agoPassed402338 ms$0.01
3 days agoPassed402445 ms$0.01

History

12 Oct 2026Price changed from $0.02 to $0.01