Open Positions

Create buy orders to open YES or NO positions in Jupiter Prediction Markets.

BETA

The Prediction Market API is currently in beta and subject to breaking changes as we continue to improve the product. If you have any feedback, please reach out in Discord.

This doc walks through creating a buy order to open a position in a prediction market. You’ll learn how to construct the order request, sign the returned transaction, and submit it to the Solana network.

Prerequisite

Before opening a position, ensure you have:

• An API key from the Jupiter Portal
• A Solana wallet with funds (JupUSD or USDC)
• Identified a market to trade (see Events & Markets)
• Requires signing and transaction submission, install @solana/web3.js npm library

API REFERENCE

For the complete endpoint specification, see the Create Order API Reference.

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Create Buy Order

Use POST /orders to create a buy order for YES or NO contracts.

Parameter	Type	Required	Description
ownerPubkey	string	Yes	Your wallet’s public key
marketId	string	Yes	The market identifier
isYes	boolean	Yes	true for YES contracts, false for NO
isBuy	boolean	Yes	true for buy orders
contracts	string	No	Number of contracts to purchase
depositAmount	string	Yes	Amount to deposit (in native token units of JupUSD or USDC)
depositMint	string	Yes	Token mint for deposit (JupUSD or USDC)

Example: Create a buy order for 2 USD worth of contracts

const response = await fetch('https://api.jup.ag/prediction/v1/orders', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'your-api-key'
  },
  body: JSON.stringify({
    ownerPubkey: wallet.publicKey.toString(),
    depositAmount: '2000000',
    depositMint: 'JuprjznTrTSp2UFa3ZBUFgwdAmtZCq4MQCwysN55USD',
    marketId: marketId,
    isYes: true,
    isBuy: true,
  })
});

const orderResponse = await response.json();
console.log(orderResponse);

Understanding the Response

Field	Description
transaction	Base64-encoded Solana transaction to sign and submit
order.pubkey	The order’s on-chain account address
order.positionPubkey	The position’s on-chain account address
order.contracts	The number of contracts being purchased

Sign and Submit the Transaction

After receiving the order response, you need to:

1. Deserialize the base64 transaction
2. Sign it with your wallet
3. Submit to the Solana network

Full Code Example

// Step 1: Create order
const orderResponse = await fetch('https://api.jup.ag/prediction/v1/orders', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'your-api-key'
  },
  body: JSON.stringify({
    ownerPubkey: wallet.publicKey.toString(),
    depositAmount: '2000000',
    depositMint: 'JuprjznTrTSp2UFa3ZBUFgwdAmtZCq4MQCwysN55USD',
    marketId: marketId, // Get from events and markets guide
    isYes: true,
    isBuy: true,
  })
}).then(r => r.json());

// Step 2: Deserialize and sign transaction
const transaction = VersionedTransaction.deserialize(
  Buffer.from(orderResponse.transaction, 'base64')
);
transaction.sign([wallet]);

const transactionBinary = transaction.serialize();
const blockhashInfo = await connection.getLatestBlockhashAndContext({ commitment: "confirmed" });

// Step 3: Send the transaction and await status
const signature = await connection.sendRawTransaction(transactionBinary, {
  maxRetries: 0,
  skipPreflight: true,
  preflightCommitment: "confirmed",
});

console.log(`Transaction sent: https://solscan.io/tx/${signature}`);
  
try {
  const confirmation = await connection.confirmTransaction({
    signature,
    blockhash: blockhashInfo.value.blockhash,
    lastValidBlockHeight: blockhashInfo.value.lastValidBlockHeight,
  }, "confirmed");

  if (confirmation.value.err) {
    console.error(`Transaction failed: ${JSON.stringify(confirmation.value.err)}`);
    console.log(`Examine the failed transaction: https://solscan.io/tx/${signature}`);
  } else {
    console.log(`Transaction successful: https://solscan.io/tx/${signature}`);
  }
} catch (error) {
  console.error(`Error confirming transaction: ${error}`);
  console.log(`Examine the transaction status: https://solscan.io/tx/${signature}`);
}

Checking Order Status

After submitting, the order enters the keeper network for matching and execution. Use GET /orders/status/{orderPubkey} to check the fill status.

Order Flow

1. Create Order: You sign a transaction that creates an order account on-chain - this transaction only opens an order account and does not guarantee that the order will be filled.
2. Keeper Fills: Jupiter’s keeper network matches your order with the underlying prediction market
3. Position Updated: Once filled, your position account reflects the new contracts
4. Order Closed: The order account is closed after completion

Polling immediately after submitting the transaction might return a pending status or a no order history found error. Wait for a few slots before polling again.

Status	Description
pending	Order submitted, waiting to be filled
filled	Order fully executed
failed	Order could not be filled

const orderPubkey = orderResponse.order.pubkey;

const statusResponse = await fetch(
  `https://api.jup.ag/prediction/v1/orders/status/${orderPubkey}`,
  {
    headers: {
      'x-api-key': 'your-api-key'
    }
  }
);

const status = await statusResponse.json();
console.log(status);

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Fee Calculation

To understand how fees work, refer to the Fees page.

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What’s Next

Once you have open positions, learn how to manage them - view your holdings, sell contracts, or cancel pending orders.

Manage Positions

View, sell, and manage your positions

Position Data & History

Query positions, orders, and transaction history