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Alpha — This endpoint is part of the Prediction Markets API, currently in early access. May change without notice.

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Request Body

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maker
string
required
Your EOA wallet address. The Safe trading address is derived automatically and returned in safeAddress.
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signer
string
Signer address. For Safe wallets (signatureType 2), this is your EOA address. Defaults to maker if not provided.
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tokenId
string
required
The outcome token ID to trade.
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side
string
required
Order side: BUY or SELL.
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price
number
required
Order price (must be greater than 0 and at most 1).
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size
number
required
Number of tokens to buy or sell. Must be positive.
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isNegRisk
boolean
default:false
Set to true for neg-risk (multi-outcome) markets.
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feeRateBps
number
default:0
Fee rate in basis points (0 = no fee).
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nonce
number
default:0
Order nonce for replay protection.
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expiration
number
default:0
Expiration timestamp in seconds. 0 means no expiration.
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tickSize
number
Tick size for rounding. If omitted, uses market default.
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signatureType
number
default:0
Signature type. Use 0 for EOA signatures, 2 for EIP-1271 (Safe wallet) signatures.

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Response

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data
object
Order typed data and metadata.
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hostname
string
Server node identifier.
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took
number
Request processing time in milliseconds.

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Usage Example

curl -X POST "https://api.mobula.io/api/2/pm/order/build" \
  -H "Content-Type: application/json" \
  -d '{
    "maker": "0xYourWalletAddress",
    "tokenId": "71321045533314185944161150504789982525459828614995786377552078351132518100924",
    "side": "BUY",
    "price": 0.35,
    "size": 100,
    "isNegRisk": false
  }'

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Integration Example

// 1. Build order
const buildRes = await fetch('https://api.mobula.io/api/2/pm/order/build', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    maker: walletAddress,
    tokenId: outcomeTokenId,
    side: 'BUY',
    price: 0.35,
    size: 100
  })
});
const { data: { typedData } } = await buildRes.json();

// 2. Sign the order
const signature = await walletClient.signTypedData(typedData);

// 3. Submit the signed order (see Order Submit)
The makerAmount and takerAmount in the order message are computed from price and size:
  • BUY: makerAmount = price * size (USDC you pay), takerAmount = size (tokens you receive)
  • SELL: makerAmount = size (tokens you give), takerAmount = price * size (USDC you receive)
Both amounts are in 6-decimal fixed-point format (multiplied by 10^6).
Order endpoints currently support Polymarket only. The platform parameter is not required — all orders are routed to Polymarket’s CLOB on Polygon.