Spread Arb

{
  "data": {
    "best_cross": {
      "buy_on": "okx",
      "edge": 0.04999999999999716,
      "edge_bps": 4.12,
      "edge_usd_per_unit": 0.05,
      "sell_on": "bybit"
    },
    "note": "gross edge, pre-fee — perp funding and fees usually eat sub-5bps gaps",
    "symbol": "SOLUSDT",
    "venues": {
      "bybit": {
        "ask": 121.46,
        "bid": 121.45
      },
      "hyperliquid": {
        "ask": 121.45,
        "bid": 121.44
      },
      "okx": {
        "ask": 121.4,
        "bid": 121.39
      }
    }
  },
  "paid": true,
  "tool": "get_spread_arb"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://x402.ochinimus.app/api/spread-arb?symbol=SOLUSDT'

# 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 - 'https://x402.ochinimus.app/api/spread-arb?symbol=SOLUSDT' \
  | 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%2Fx402.ochinimus.app%2Fapi%2Fspread-arb
const res = await pay("https://x402.ochinimus.app/api/spread-arb?symbol=SOLUSDT");
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.get("https://x402.ochinimus.app/api/spread-arb?symbol=SOLUSDT")
    print(res.status_code, res.text)