ToolVet
77trust / 100

Decode

by chain.openverbs.com in Onchain & crypto

x402 APIPassing, checked 2 h ago

Turn a 4-byte function selector or full calldata into its human-readable function signature, and (when calldata is present) the decoded argument values. Supply an `abi` for a fully deterministic offline decode, or omit it to look the selector up in public signature registries. Reads with automatic fallback.

POST
https://chain.openverbs.com/v1/decode
Price
$0.004
per call in USDC
Uptime
100%
last 30 days
Response time
550 ms
610 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

How to call it

POST https://chain.openverbs.com/v1/decode

Each call costs $0.004 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://chain.openverbs.com/v1/decode
content-type: application/json

{
  "selector": "0xa9059cbb"
}

Parameters

ParameterTypeRequiredDescription
abiarray or stringNoOptional human-readable signatures, e.g. ["function transfer(address,uint256)"], for an exact offline decode.
datastringNoFull calldata hex (selector + arguments).
selectorstringNo4-byte function selector, e.g. 0xa9059cbb.

Example response

The listing has no example response.

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.004.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://chain.openverbs.com/v1/decode' \
  -H 'content-type: application/json' \
  --data-raw '{"selector":"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://chain.openverbs.com/v1/decode' \
  -H 'content-type: application/json' \
  --data-raw '{"selector":"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 $0.004 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.004" });
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 $0.004 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fchain.openverbs.com%2Fv1%2Fdecode&method=POST
const res = await pay("https://chain.openverbs.com/v1/decode", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "selector": "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 $0.004 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.004"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://chain.openverbs.com/v1/decode",
        json={
            "selector": "0xa9059cbb",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
2 h agoPassed402166 ms$0.004
6 h agoPassed402168 ms$0.004
10 h agoPassed402577 ms$0.004
14 h agoPassed402591 ms$0.004
18 h agoPassed402601 ms$0.004
Show 10 older checks
22 h agoPassed402760 ms$0.004
26 h agoPassed402568 ms$0.004
30 h agoPassed402559 ms$0.004
34 h agoPassed402597 ms$0.004
37 h agoPassed402496 ms$0.004
41 h agoPassed402610 ms$0.004
44 h agoPassed402571 ms$0.004
2 days agoPassed402550 ms$0.004
2 days agoPassed402164 ms$0.004
2 days agoPassed402172 ms$0.004