Commerce Quantity Preflight

Last 30 days

Uptime

100%

Response time

46 ms typical, 214 ms slowest 5%

Last check

1 h ago

Next check

any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/commerce/quantity-preflight" \
  -H "content-type: application/json" \
  -d '{"quantity":8,"url":"https://shop.example/products/widget","variant_id":"123"}'

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fhttp--forest-gas-station-mainnet--lcjl27p8lmjs.code.run%2Fcommerce%2Fquantity-preflight
const res = await pay("https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/commerce/quantity-preflight", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"quantity":8,"url":"https://shop.example/products/widget","variant_id":"123"}),
});
console.log(await res.json());

Example input

{
  "quantity": 8,
  "url": "https://shop.example/products/widget",
  "variant_id": "123"
}

Example output

{
  "capability": "commerce.quantity-preflight",
  "data": {
    "allowed": false,
    "available_quantity": 1,
    "blockers": [],
    "increment": 1,
    "max": 1,
    "min": 1,
    "requested_quantity": 1,
    "stock_known": false
  },
  "meta": {
    "cache": "miss",
    "checked_at": "2026-01-01T00:00:00.000Z",
    "duration_ms": 0,
    "provider": "shopify-ajax"
  },
  "ok": true,
  "version": "1"
}

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