ToolVet
77trust / 100

First Funder

by First Funder in Onchain & crypto

x402 APIPassing, checked 2 h ago

🆕 Funding provenance in one call. Traces a Base wallet back to its EARLIEST transaction and resolves who first funded it: a recognized exchange/bridge (real on-ramp, lower risk), an anon EOA (possible sybil/burner — trace the cluster), or a contract. Returns the first funder, whether it's a contract or EOA, the initial value, and wallet age. The sybil/origin screen no other Base tool gives — the counterparty check before you transact. wallet= required. Not financial advice.

GET
https://402.com.tr/api/x402/first-funder
Price
$0.04
per call in USDC
Uptime
100%
last 30 days
Response time
482 ms
821 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

GET https://402.com.tr/api/x402/first-funder

Each call costs $0.04 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://402.com.tr/api/x402/first-funder?wallet=0x973a31858f4d2125f48c880542da11a2796f12d6

Parameters

ParameterTypeRequiredDescription
walletstringYesWallet address

Example response

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

{
  "checkedAt": "2026-10-11T17:11:23.267Z",
  "firstActivity": "2025-04-23T08:31:51.000Z",
  "firstFunder": "0x156B58632D8BA7BE86ebdee7B828A5476d8EFbd0",
  "funderLabel": null,
  "funderType": "eoa",
  "verdict": "funded_by_wallet",
  "wallet": "0x973A31858f4D2125f48C880542DA11a2796f12D6",
  "walletAgeDays": 536
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.04.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://402.com.tr/api/x402/first-funder?wallet=0x973a31858f4d2125f48c880542da11a2796f12d6'

# 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://402.com.tr/api/x402/first-funder?wallet=0x973a31858f4d2125f48c880542da11a2796f12d6' \
  | 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 $0.04 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.04" });
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 $0.04 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2F402.com.tr%2Fapi%2Fx402%2Ffirst-funder
const res = await pay("https://402.com.tr/api/x402/first-funder?wallet=0x973a31858f4d2125f48c880542da11a2796f12d6");
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 $0.04 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.04"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://402.com.tr/api/x402/first-funder?wallet=0x973a31858f4d2125f48c880542da11a2796f12d6")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
2 h agoPassed402455 ms$0.04
7 h agoPassed402610 ms$0.04
12 h agoPassed402460 ms$0.04
17 h agoPassed402473 ms$0.04
21 h agoPassed402660 ms$0.04
Show 10 older checks
26 h agoPassed402506 ms$0.04
30 h agoPassed402598 ms$0.04
34 h agoPassed402538 ms$0.04
38 h agoPassed402375 ms$0.04
43 h agoPassed402369 ms$0.04
47 h agoPassed402454 ms$0.04
2 days agoPassed402488 ms$0.04
2 days agoPassed402364 ms$0.04
2 days agoPassed402504 ms$0.04
3 days agoPassed402821 ms$0.04