ToolVet
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Converters Weight Converter

by AgentTools in Documents & files

x402 APIPassing, checked 39 min ago

Convert between weight and mass units: metric tons, kilograms, grams, milligrams, pounds, ounces and stones with exact international definitions. Use this when an agent needs to kilograms, pounds, ounces and more.

GET https://agentstoolshub.com/api/v1/converters/weight-converter

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
173 ms typical, 400 ms slowest 5%
Last check
39 min ago
Next check
any minute now

How to call it

GET https://agentstoolshub.com/api/v1/converters/weight-converter

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.

GET https://agentstoolshub.com/api/v1/converters/weight-converter?from=t&to=kg&value=1

Parameters

ParameterTypeRequiredDescription
fromstringYesFrom One of: t, kg, g, mg, lb, oz, st.
tostringYesTo One of: t, kg, g, mg, lb, oz, st.
valuenumberYesValue

Example response

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

{
  "result": {
    "answer": "1,000 kg",
    "answerLabel": "1 Metric tons = ? Kilograms",
    "details": [
      {
        "label": "Exact factor",
        "value": "1 t = 1000 kg"
      },
      {
        "label": "Reverse",
        "value": "1 kg = 0.001 t"
      }
    ],
    "steps": [
      "1 t × 1000 = 1,000 kg",
      "1,000 kg ÷ 1 = 1,000 kg"
    ],
    "value": 1000
  },
  "tool": "weight-converter"
}

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 'https://agentstoolshub.com/api/v1/converters/weight-converter?from=t&to=kg&value=1'

# 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 - 'https://agentstoolshub.com/api/v1/converters/weight-converter?from=t&to=kg&value=1' \
  | 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%2Fagentstoolshub.com%2Fapi%2Fv1%2Fconverters%2Fweight-converter
const res = await pay("https://agentstoolshub.com/api/v1/converters/weight-converter?from=t&to=kg&value=1");
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.get("https://agentstoolshub.com/api/v1/converters/weight-converter?from=t&to=kg&value=1")
    print(res.status_code, res.text)

Security scan

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