ToolVet
15trust / 100

Decodificar Firma Pago

by Vextorium in Onchain & crypto

x402 APIFailing, checked 32 min ago

Translates a 4-byte function selector (e.g. 0xa9059cbb) or a 32-byte event topic into its human-readable signature (e.g. transfer(address,uint256)). Essential for an agent reading or verifying transactions. Live from 4byte.directory.

POST
https://api.vextorium.com/decodificar-firma-pago
Price
$0.003
per call in USDC
Uptime
0.0%
last 30 days
Response time
-
no timed checks yet
Last check
Failed
32 min ago, next in 24 min

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 32 min 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/decodificar-firma-pago

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/decodificar-firma-pago
content-type: application/json

{
  "firma": "0xa9059cbb"
}

Parameters

ParameterTypeRequiredDescription
firmastringYesFunction selector (0x + 8 hex) or event topic (0x + 64 hex)

Example response

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

{
  "codigo": "0xa9059cbb",
  "firmas": [
    "transfer(address,uint256)",
    "many_msg_babbage(bytes1)",
    "transfer(bytes4[9],bytes5[6],int48[11])",
    "func_2093253501(bytes)",
    "join_tg_invmru_haha_fd06787(address,bool)",
    "workMyDirefulOwner(uint256,uint256)"
  ],
  "fuente": "4byte.directory",
  "nota": "Un mismo código puede casar con varias firmas (colisiones); la más antigua suele ser la real. Fuente: 4byte.directory.",
  "posibles": 6,
  "tipo": "funcion"
}

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/decodificar-firma-pago' \
  -H 'content-type: application/json' \
  --data-raw '{"firma":"0xa9059cbb"}'

# 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/decodificar-firma-pago' \
  -H 'content-type: application/json' \
  --data-raw '{"firma":"0xa9059cbb"}' \
  | 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%2Fdecodificar-firma-pago&method=POST
const res = await pay("https://api.vextorium.com/decodificar-firma-pago", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "firma": "0xa9059cbb"
  }),
});
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/decodificar-firma-pago",
        json={
            "firma": "0xa9059cbb",
        },
    )
    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
32 min agoAmount "0.003" is not in atomic token units402261 ms$0.003
5 h agoAmount "0.003" is not in atomic token units402287 ms$0.003
10 h agoAmount "0.003" is not in atomic token units402317 ms$0.003
15 h agoAmount "0.003" is not in atomic token units40285 ms$0.003
19 h agoAmount "0.003" is not in atomic token units40276 ms$0.003
Show 10 older checks
24 h agoAmount "0.003" is not in atomic token units402245 ms$0.003
29 h agoAmount "0.003" is not in atomic token units402308 ms$0.003
33 h agoAmount "0.003" is not in atomic token units402167 ms$0.003
38 h agoAmount "0.003" is not in atomic token units40276 ms$0.003
42 h agoAmount "0.003" is not in atomic token units40274 ms$0.003
46 h agoAmount "0.003" is not in atomic token units402137 ms$0.003
2 days agoAmount "0.003" is not in atomic token units40290 ms$0.003
2 days agoAmount "0.003" is not in atomic token units40294 ms$0.003
2 days agoAmount "0.003" is not in atomic token units402165 ms$0.003
3 days agoAmount "0.003" is not in atomic token units40272 ms$0.003