ToolVet
75trust / 100

Crc16

by CRC-16 (multiple variants) in Onchain & crypto

x402 APIPassing, checked 11 min ago

CRC-16 over the input payload in one of several standard variants (ccitt-false, xmodem, modbus, ibm; default ccitt-false). Returns the checksum as an unsigned integer and 4-digit hex. Non-cryptographic.

POST
https://checksum.openverbs.com/v1/crc16
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
564 ms
629 ms slowest 5%
Last check
Passed
11 min ago, next in 16 min

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://checksum.openverbs.com/v1/crc16

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://checksum.openverbs.com/v1/crc16
content-type: application/json

{
  "data": "example",
  "encoding": "utf8",
  "variant": "ccitt-false"
}

Parameters

ParameterTypeRequiredDescription
datastringYesInput payload.
encodingstringNoHow to decode `data`. Default utf8. One of: utf8, hex, base64.
variantstringNoCRC-16 variant. Default ccitt-false. One of: ccitt-false, xmodem, modbus, ibm.

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://checksum.openverbs.com/v1/crc16' \
  -H 'content-type: application/json' \
  --data-raw '{"data":"example","encoding":"utf8","variant":"ccitt-false"}'

# 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://checksum.openverbs.com/v1/crc16' \
  -H 'content-type: application/json' \
  --data-raw '{"data":"example","encoding":"utf8","variant":"ccitt-false"}' \
  | 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%2Fchecksum.openverbs.com%2Fv1%2Fcrc16&method=POST
const res = await pay("https://checksum.openverbs.com/v1/crc16", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "data": "example",
    "encoding": "utf8",
    "variant": "ccitt-false"
  }),
});
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://checksum.openverbs.com/v1/crc16",
        json={
            "data": "example",
            "encoding": "utf8",
            "variant": "ccitt-false",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
11 min agoPassed402621 ms$0.002
5 h agoPassed402565 ms$0.002
11 h agoPassed402597 ms$0.002
16 h agoPassed402595 ms$0.002
21 h agoPassed402559 ms$0.002
Show 10 older checks
26 h agoPassed402558 ms$0.002
30 h agoPassed402607 ms$0.002
35 h agoPassed402629 ms$0.002
40 h agoPassed402581 ms$0.002
44 h agoPassed402559 ms$0.002
2 days agoPassed402561 ms$0.002
2 days agoPassed402561 ms$0.002
2 days agoPassed402559 ms$0.002
3 days agoPassed402587 ms$0.002
3 days agoPassed402613 ms$0.002