Order signing

import { Wallet, randomBytes, hexlify } from "ethers";

const wallet = new Wallet(process.env.SX_PRIVATE_KEY);

const { data: meta } = await fetch("https://api.sx.bet/metadata/obv3").then((r) =>
  r.json()
);
const domain = meta.domain; // { name, version, chainId, verifyingContract }

const types = {
  Order: [
    { name: "marketHash", type: "bytes32" },
    { name: "baseToken", type: "address" },
    { name: "totalBetSize", type: "uint256" },
    { name: "percentageOdds", type: "uint256" },
    { name: "salt", type: "uint256" },
    { name: "expiry", type: "uint256" },
    { name: "maker", type: "address" },
    { name: "isMakerBettingOutcomeOne", type: "bool" },
  ],
};

const value = {
  marketHash: "0x…", // 32-byte market hash
  baseToken: meta.activeAsset.baseToken,
  totalBetSize: "1000000", // 1 USDC, base units
  percentageOdds: "50000000000000000000", // 50% on the 1e20 scale
  salt: hexlify(randomBytes(32)),
  expiry: 0, // 0 = never expires
  maker: wallet.address,
  isMakerBettingOutcomeOne: true,
};

const orderSignature = await wallet.signTypedData(domain, types, value);

import os
import secrets
import requests
from eth_account import Account
from eth_account.messages import encode_typed_data

account = Account.from_key(os.environ["SX_PRIVATE_KEY"])
meta = requests.get("https://api.sx.bet/metadata/obv3").json()["data"]

structured_data = {
    "types": {
        "EIP712Domain": [
            {"name": "name", "type": "string"},
            {"name": "version", "type": "string"},
            {"name": "chainId", "type": "uint256"},
            {"name": "verifyingContract", "type": "address"},
        ],
        "Order": [
            {"name": "marketHash", "type": "bytes32"},
            {"name": "baseToken", "type": "address"},
            {"name": "totalBetSize", "type": "uint256"},
            {"name": "percentageOdds", "type": "uint256"},
            {"name": "salt", "type": "uint256"},
            {"name": "expiry", "type": "uint256"},
            {"name": "maker", "type": "address"},
            {"name": "isMakerBettingOutcomeOne", "type": "bool"},
        ],
    },
    "primaryType": "Order",
    "domain": meta["domain"],
    "message": {
        "marketHash": "0x…",
        "baseToken": meta["activeAsset"]["baseToken"],
        "totalBetSize": 1000000,
        "percentageOdds": 50000000000000000000,
        "salt": int("0x" + secrets.token_hex(32), 16),
        "expiry": 0,
        "maker": account.address,
        "isMakerBettingOutcomeOne": True,
    },
}

signed = Account.sign_message(
    encode_typed_data(full_message=structured_data),
    private_key=os.environ["SX_PRIVATE_KEY"],
)
order_signature = signed.signature.to_0x_hex()