Trade Swap

{
  "amountOutSimulated": "37363756124729788",
  "attestation": null,
  "block": 23584000,
  "expiresAt": "2026-10-09T23:55:11.000Z",
  "minAmountOut": "36990118563482490",
  "next": "sign_permit",
  "quoteId": "q_884b5883d6095ae4",
  "recipient": "0x7336cf1062975bd942cc4f1ba33b44bb7f1fbb33",
  "safety": {
    "scope": {
      "block": 23584000,
      "walletProfile": "taker"
    },
    "verdict": "pinned"
  },
  "signatures": [
    {
      "kind": "permit2",
      "typedData": {
        "domain": {
          "chainId": 5042,
          "name": "Permit2",
          "verifyingContract": "0x000000000022D473030F116dDEE9F6B43aC78BA3"
        },
        "message": {
          "details": {
            "amount": "100000000",
            "expiration": "1794182051",
            "nonce": "0",
            "token": "0x3600000000000000000000000000000000000000"
          },
          "sigDeadline": "1791590111",
          "spender": "0x6cf4f7785d479b9ec1c3abe2fb569525380baede"
        },
        "primaryType": "PermitSingle",
        "types": {
          "PermitDetails": [
            {
              "name": "token",
              "type": "address"
            }
          ],
          "PermitSingle": [
            {
              "name": "details",
              "type": "PermitDetails"
            }
          ]
        }
      }
    }
  ],
  "transactions": [
    {
      "data": "0x095ea7b3000000000000000000000000000000000022d473030f116ddee9f6b43ac78ba3ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
      "gas": "72444",
      "purpose": "approve",
      "to": "0x3600000000000000000000000000000000000000",
      "value": "0"
    }
  ],
  "warnings": []
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.arcgate.dev/trade/v1/swap' \
  -H 'content-type: application/json' \
  --data-raw '{"quoteId":"q_884b5883d6095ae4","taker":"0x7336cf1062975bD942cc4f1bA33b44bB7F1FbB33"}'

# 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://api.arcgate.dev/trade/v1/swap' \
  -H 'content-type: application/json' \
  --data-raw '{"quoteId":"q_884b5883d6095ae4","taker":"0x7336cf1062975bD942cc4f1bA33b44bB7F1FbB33"}' \
  | 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 $0.01 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%2Fapi.arcgate.dev%2Ftrade%2Fv1%2Fswap&method=POST
const res = await pay("https://api.arcgate.dev/trade/v1/swap", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "quoteId": "q_884b5883d6095ae4",
    "taker": "0x7336cf1062975bD942cc4f1bA33b44bB7F1FbB33"
  }),
});
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 $0.01 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://api.arcgate.dev/trade/v1/swap",
        json={
            "quoteId": "q_884b5883d6095ae4",
            "taker": "0x7336cf1062975bD942cc4f1bA33b44bB7F1FbB33",
        },
    )
    print(res.status_code, res.text)