ToolVet
71trust / 100

Vat Determine

by usaref.dev in Markets & finance

x402 APIPassing, checked 3 h ago

Cross-border VAT treatment for a digital-services sale: place of supply, who accounts, rate basis, registration trigger — the applied rule cited to the statute (EU, UK & South Africa; defined supply pairs)

POST
https://usaref.dev/v1/vat/determine
Price
$0.1
per call in USDC
Uptime
100%
last 30 days
Response time
858 ms
937 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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Status and outage history · Atom feed

How to call it

POST https://usaref.dev/v1/vat/determine

Each call costs $0.1 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://usaref.dev/v1/vat/determine
content-type: application/json

{
  "buyer_country": "de",
  "buyer_type": "unknown",
  "seller_country": "us"
}

Parameters

ParameterTypeRequiredDescription
buyer_countrystringYesBuyer's country, ISO 3166-1 alpha-2
buyer_typestringNounknown (default) = buyer identified only by wallet address — treated as B2C under default rules and explicitly flagged in the response One of: B2B, B2C, unknown.
receiptbooleanNoOptional. true adds an Ed25519 answer receipt on a paid 200, incluedd in this price. Not a certified extract.
seller_countrystringYesSeller's country, ISO 3166-1 alpha-2 (EL accepted for Greece, UK for United Kingdom)

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 $0.1.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://usaref.dev/v1/vat/determine' \
  -H 'content-type: application/json' \
  --data-raw '{"buyer_country":"de","buyer_type":"unknown","seller_country":"us"}'

# 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://usaref.dev/v1/vat/determine' \
  -H 'content-type: application/json' \
  --data-raw '{"buyer_country":"de","buyer_type":"unknown","seller_country":"us"}' \
  | 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 $0.1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.1" });
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 $0.1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fusaref.dev%2Fv1%2Fvat%2Fdetermine&method=POST
const res = await pay("https://usaref.dev/v1/vat/determine", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "buyer_country": "de",
    "buyer_type": "unknown",
    "seller_country": "us"
  }),
});
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 $0.1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.1"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://usaref.dev/v1/vat/determine",
        json={
            "buyer_country": "de",
            "buyer_type": "unknown",
            "seller_country": "us",
        },
    )
    print(res.status_code, res.text)

Security scan

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