ToolVet
75trust / 100

Arithmetic

by Fraction arithmetic in Other

x402 APIPassing, checked 3 h ago

Add, subtract, multiply or divide two fractions and return the exact, fully-reduced result. All computation is done in BigInt so there is no floating-point error. Dividing by a zero fraction is a clean 400.

POST
https://fraction.openverbs.com/v1/arithmetic
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
563 ms
611 ms slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow to call it

Reliability

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How to call it

POST https://fraction.openverbs.com/v1/arithmetic

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://fraction.openverbs.com/v1/arithmetic
content-type: application/json

{
  "a": {
    "denominator": 1,
    "numerator": 1
  },
  "b": {
    "denominator": 1,
    "numerator": 1
  },
  "operation": "add"
}

Parameters

ParameterTypeRequiredDescription
aobjectYesFirst fraction.
bobjectYesSecond fraction.
operationstringYesThe operation. One of: add, subtract, multiply, divide.

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://fraction.openverbs.com/v1/arithmetic' \
  -H 'content-type: application/json' \
  --data-raw '{"a":{"denominator":1,"numerator":1},"b":{"denominator":1,"numerator":1},"operation":"add"}'

# 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://fraction.openverbs.com/v1/arithmetic' \
  -H 'content-type: application/json' \
  --data-raw '{"a":{"denominator":1,"numerator":1},"b":{"denominator":1,"numerator":1},"operation":"add"}' \
  | 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%2Ffraction.openverbs.com%2Fv1%2Farithmetic&method=POST
const res = await pay("https://fraction.openverbs.com/v1/arithmetic", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "a": {
      "denominator": 1,
      "numerator": 1
    },
    "b": {
      "denominator": 1,
      "numerator": 1
    },
    "operation": "add"
  }),
});
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://fraction.openverbs.com/v1/arithmetic",
        json={
            "a": {
                "denominator": 1,
                "numerator": 1,
            },
            "b": {
                "denominator": 1,
                "numerator": 1,
            },
            "operation": "add",
        },
    )
    print(res.status_code, res.text)

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