Extract Schema

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://gpt.558686.xyz/v1/extract/schema' \
  -H 'content-type: application/json' \
  --data-raw '{"content":"Invoice #INV-2024-118 from Acme Corp, dated 2026-09-15, total $1,240.00, contact [email protected]","instructions":"Normalize the total to a number without currency symbols.","schema":{"properties":{"contactEmail":{"type":"string"},"date":{"type":"string"},"invoiceNumber":{"type":"string"},"total":{"type":"number"},"vendor":{"type":"string"}},"required":["invoiceNumber","vendor","total"],"type":"object"}}'

# 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://gpt.558686.xyz/v1/extract/schema' \
  -H 'content-type: application/json' \
  --data-raw '{"content":"Invoice #INV-2024-118 from Acme Corp, dated 2026-09-15, total $1,240.00, contact [email protected]","instructions":"Normalize the total to a number without currency symbols.","schema":{"properties":{"contactEmail":{"type":"string"},"date":{"type":"string"},"invoiceNumber":{"type":"string"},"total":{"type":"number"},"vendor":{"type":"string"}},"required":["invoiceNumber","vendor","total"],"type":"object"}}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.5 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.5" });
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 $0.5 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fgpt.558686.xyz%2Fv1%2Fextract%2Fschema&method=POST
const res = await pay("https://gpt.558686.xyz/v1/extract/schema", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "content": "Invoice #INV-2024-118 from Acme Corp, dated 2026-09-15, total $1,240.00, contact [email protected]",
    "instructions": "Normalize the total to a number without currency symbols.",
    "schema": {
      "properties": {
        "contactEmail": {
          "type": "string"
        },
        "date": {
          "type": "string"
        },
        "invoiceNumber": {
          "type": "string"
        },
        "total": {
          "type": "number"
        },
        "vendor": {
          "type": "string"
        }
      },
      "required": [
        "invoiceNumber",
        "vendor",
        "total"
      ],
      "type": "object"
    }
  }),
});
console.log(res.status, await res.text());

# 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 $0.5 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.5"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://gpt.558686.xyz/v1/extract/schema",
        json={
            "content": "Invoice #INV-2024-118 from Acme Corp, dated 2026-09-15, total $1,240.00, contact [email protected]",
            "instructions": "Normalize the total to a number without currency symbols.",
            "schema": {
                "properties": {
                    "contactEmail": {
                        "type": "string",
                    },
                    "date": {
                        "type": "string",
                    },
                    "invoiceNumber": {
                        "type": "string",
                    },
                    "total": {
                        "type": "number",
                    },
                    "vendor": {
                        "type": "string",
                    },
                },
                "required": [
                    "invoiceNumber",
                    "vendor",
                    "total",
                ],
                "type": "object",
            },
        },
    )
    print(res.status_code, res.text)