ToolVet
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Hmac

by HMAC data in Developer tools

x402 APIPassing, checked 3 h ago

Compute a keyed HMAC of some data with a secret key — the standard way to sign and verify webhooks (Stripe, GitHub, etc.) and API requests. Data and key may each be utf8/hex/base64/base64url; the tag is returned as hex/base64/base64url.

POST
https://hash.openverbs.com/v1/hmac
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
583 ms
651 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

POST https://hash.openverbs.com/v1/hmac

Each call costs $0.002 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://hash.openverbs.com/v1/hmac
content-type: application/json

{
  "algorithm": "sha256",
  "data": "example",
  "inputEncoding": "utf8",
  "key": "example",
  "keyEncoding": "utf8"
}

Parameters

ParameterTypeRequiredDescription
algorithmstringYesDigest algorithm, one of sha256, sha512, sha384, sha224, sha1, sha3-256, sha3-384, sha3-512, md5, ripemd160, blake2b512, blake2s256. One of: sha256, sha512, sha384, sha224, sha1, sha3-256, sha3-384, sha3-512, md5, ripemd160, blake2b512, blake2s256.
datastringYesThe data to authenticate, in `inputEncoding`.
inputEncodingstringNoHow to interpret the text as bytes (utf8, hex, base64, base64url). Default utf8. One of: utf8, hex, base64, base64url.
keystringYesThe secret key, in `keyEncoding`.
keyEncodingstringNoHow to interpret the key as bytes (utf8, hex, base64, base64url). Default utf8. One of: utf8, hex, base64, base64url.
outputEncodingstringNoHow to render the digest (hex, base64, base64url). Default hex. One of: hex, base64, base64url.

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 $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://hash.openverbs.com/v1/hmac' \
  -H 'content-type: application/json' \
  --data-raw '{"algorithm":"sha256","data":"example","inputEncoding":"utf8","key":"example","keyEncoding":"utf8"}'

# 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://hash.openverbs.com/v1/hmac' \
  -H 'content-type: application/json' \
  --data-raw '{"algorithm":"sha256","data":"example","inputEncoding":"utf8","key":"example","keyEncoding":"utf8"}' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fhash.openverbs.com%2Fv1%2Fhmac&method=POST
const res = await pay("https://hash.openverbs.com/v1/hmac", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "algorithm": "sha256",
    "data": "example",
    "inputEncoding": "utf8",
    "key": "example",
    "keyEncoding": "utf8"
  }),
});
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://hash.openverbs.com/v1/hmac",
        json={
            "algorithm": "sha256",
            "data": "example",
            "inputEncoding": "utf8",
            "key": "example",
            "keyEncoding": "utf8",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

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3 h agoPassed402553 ms$0.002
7 h agoPassed402572 ms$0.002
12 h agoPassed402577 ms$0.002
17 h agoPassed402555 ms$0.002
22 h agoPassed402651 ms$0.002
Show 10 older checks
26 h agoPassed402628 ms$0.002
31 h agoPassed402552 ms$0.002
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43 h agoPassed402588 ms$0.002
47 h agoPassed402555 ms$0.002
2 days agoPassed402614 ms$0.002
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3 days agoPassed402588 ms$0.002
3 days agoPassed402562 ms$0.002