Send an order

import { ChainId, OrderBuilder, Side } from "@predictdotfun/sdk";
import { Wallet } from "ethers";

const apiKey = "YOUR_API_KEY";
const apiUrl = "https://api.predict.fun";
const jwt = "YOUR_JWT"; // from the Log in how-to
// a market ID, like the ones the Market data example prints.
const marketId = "MARKET_ID";
const wallet = new Wallet(process.env.WALLET_PRIVATE_KEY!);
const headers = {
  "Content-Type": "application/json",
  "x-api-key": apiKey,
  Authorization: `Bearer ${jwt}`,
};

// 1. Read the market: its outcomes, its fee, and which exchange it trades on.
const marketResponse = await fetch(`${apiUrl}/v1/markets/${marketId}`, {
  headers,
});
const market = (await marketResponse.json()).data;

// 2. Build and sign the order with the SDK. Place orders explains each step.
const orderBuilder = await OrderBuilder.make(ChainId.BnbMainnet, wallet);
const { pricePerShare, makerAmount, takerAmount } =
  orderBuilder.getLimitOrderAmounts({
    side: Side.BUY,
    pricePerShareWei: 400000000000000000n, // 0.40 USDT
    quantityWei: 10000000000000000000n, // 10 shares
  });
const order = orderBuilder.buildOrder("LIMIT", {
  side: Side.BUY,
  tokenId: market.outcomes[0].onChainId,
  makerAmount,
  takerAmount,
  feeRateBps: market.feeRateBps,
});
const typedData = orderBuilder.buildTypedData(order, {
  isNegRisk: market.isNegRisk,
  isYieldBearing: market.isYieldBearing,
});
const signedOrder = await orderBuilder.signTypedDataOrder(typedData);
const hash = orderBuilder.buildTypedDataHash(typedData);

// 3. Send it.
const createResponse = await fetch(`${apiUrl}/v1/orders`, {
  method: "POST",
  headers,
  body: JSON.stringify({
    data: {
      order: { ...signedOrder, hash },
      pricePerShare: pricePerShare.toString(),
      strategy: "LIMIT",
    },
  }),
});
const created = await createResponse.json();
if (!createResponse.ok) throw new Error(`${created.error}: ${created.message}`);
console.log(`Order ${created.data.orderId} accepted`);

// 4. Read its status. A new order can briefly return 404, so retry for a
// few seconds.
const statusUrl = `${apiUrl}/v1/orders/${hash}`;
let statusResponse = await fetch(statusUrl, { headers });
for (let retry = 0; retry < 4 && statusResponse.status === 404; retry++) {
  await new Promise((resolve) => setTimeout(resolve, 1000));
  statusResponse = await fetch(statusUrl, { headers });
}
const orderStatus = await statusResponse.json();
if (!statusResponse.ok) {
  throw new Error(`${orderStatus.error}: ${orderStatus.message}`);
}
const { status, amountFilled } = orderStatus.data;
console.log(status, amountFilled);