ToolVet
15trust / 100

Evm Signature Verify

by Vextorium in Onchain & crypto

x402 APIFailing, checked 4 h ago

Verify an Ethereum signature: a personal_sign (EIP-191) message or EIP-712 typed data. Recovers the signer address and, if you pass one, confirms it matches. Local computation; EIP-1271 contract wallets are not covered.

POST
https://api.vextorium.com/v1/evm-signature-verify
Price
$0.003
per call in USDC
Uptime
0.0%
last 30 days
Response time
-
no timed checks yet
Last check
Failed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 4 h ago: Amount "0.003" is not in atomic token units

Status and outage history · Atom feed

How to call it

POST https://api.vextorium.com/v1/evm-signature-verify

Each call costs $0.003 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://api.vextorium.com/v1/evm-signature-verify
content-type: application/json

{
  "address": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf",
  "message": "Hello Vextorium",
  "signature": "0x2126c8e3a0da46b0d8cba8ce3d0210337bb23032b681244c026ad68cd41c764325c24b8ca2e1162a4c31969808b17ded11db7ec35d49ea63b7cc6f6d95e276c91c"
}

Parameters

ParameterTypeRequiredDescription
addressstringNo
eip712_dataobjectNo
messagestringNo
signaturestringYes

Example response

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

{
  "expected_address": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf",
  "signed_hash": "0x517cc9957090f83459004d4980c16e723e44524c30d84175324025d957b0451a",
  "signer": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf",
  "type": "EIP-191 personal_sign",
  "valid": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.vextorium.com/v1/evm-signature-verify' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf","message":"Hello Vextorium","signature":"0x2126c8e3a0da46b0d8cba8ce3d0210337bb23032b681244c026ad68cd41c764325c24b8ca2e1162a4c31969808b17ded11db7ec35d49ea63b7cc6f6d95e276c91c"}'

# 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://api.vextorium.com/v1/evm-signature-verify' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf","message":"Hello Vextorium","signature":"0x2126c8e3a0da46b0d8cba8ce3d0210337bb23032b681244c026ad68cd41c764325c24b8ca2e1162a4c31969808b17ded11db7ec35d49ea63b7cc6f6d95e276c91c"}' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.vextorium.com%2Fv1%2Fevm-signature-verify&method=POST
const res = await pay("https://api.vextorium.com/v1/evm-signature-verify", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf",
    "message": "Hello Vextorium",
    "signature": "0x2126c8e3a0da46b0d8cba8ce3d0210337bb23032b681244c026ad68cd41c764325c24b8ca2e1162a4c31969808b17ded11db7ec35d49ea63b7cc6f6d95e276c91c"
  }),
});
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.vextorium.com/v1/evm-signature-verify",
        json={
            "address": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf",
            "message": "Hello Vextorium",
            "signature": "0x2126c8e3a0da46b0d8cba8ce3d0210337bb23032b681244c026ad68cd41c764325c24b8ca2e1162a4c31969808b17ded11db7ec35d49ea63b7cc6f6d95e276c91c",
        },
    )
    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
4 h agoAmount "0.003" is not in atomic token units402289 ms$0.003
9 h agoAmount "0.003" is not in atomic token units402105 ms$0.003
14 h agoAmount "0.003" is not in atomic token units40290 ms$0.003
18 h agoAmount "0.003" is not in atomic token units40279 ms$0.003
23 h agoAmount "0.003" is not in atomic token units402280 ms$0.003
Show 10 older checks
28 h agoExpected HTTP 402, got 502502115 ms-
32 h agoAmount "0.003" is not in atomic token units40285 ms$0.003
37 h agoAmount "0.003" is not in atomic token units402205 ms$0.003
41 h agoAmount "0.003" is not in atomic token units40279 ms$0.003
46 h agoAmount "0.003" is not in atomic token units40291 ms$0.003
2 days agoAmount "0.003" is not in atomic token units40291 ms$0.003
2 days agoAmount "0.003" is not in atomic token units402246 ms$0.003
2 days agoAmount "0.003" is not in atomic token units402177 ms$0.003
3 days agoAmount "0.003" is not in atomic token units40282 ms$0.003
3 days agoAmount "0.003" is not in atomic token units402230 ms$0.003