ToolVet
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Unit Convert

by Sindri in Documents & files

x402 APIPassing, checked 2 h ago

Unit conversion for length, mass, volume, and temperature using exact conversion factors (temperature uses the correct affine formulas, not simple multiplication).

POST https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/unitConvert

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Uptime
100%
Response time
326 ms typical, 525 ms slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

POST https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/unitConvert

Each call costs $0.01 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://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/unitConvert
content-type: application/json

{
  "category": "length",
  "from": "m",
  "to": "km",
  "value": 1000
}

Parameters

ParameterTypeRequiredDescription
categorystringYesUnit category. One of: length, mass, volume, temperature.
fromstringYesSource unit, e.g. "m", "kg", "gal", "C".
tostringYesTarget unit.
valuenumberYesThe numeric value to convert.

Example response

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

{
  "data": {
    "params": {
      "category": "length",
      "from": "m",
      "to": "km",
      "value": 1000
    },
    "result": 1
  },
  "ok": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/unitConvert' \
  -H 'content-type: application/json' \
  --data-raw '{"category":"length","from":"m","to":"km","value":1000}'

# 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://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/unitConvert' \
  -H 'content-type: application/json' \
  --data-raw '{"category":"length","from":"m","to":"km","value":1000}' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws%2FunitConvert&method=POST
const res = await pay("https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/unitConvert", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "category": "length",
    "from": "m",
    "to": "km",
    "value": 1000
  }),
});
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/unitConvert",
        json={
            "category": "length",
            "from": "m",
            "to": "km",
            "value": 1000,
        },
    )
    print(res.status_code, res.text)

Security scan

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