Overview
All orders on Limitless are signed using EIP-712 structured data. The venue’s exchange address is used as the verifyingContract in the signing domain.
If you’re using the Programmatic API with delegated signing, the server handles EIP-712 signing for you via managed wallets. This page is for partners and traders who sign orders with their own private keys. EIP-712 Domain
{
"name": "Limitless CTF Exchange",
"version": "1",
"chainId": 8453,
"verifyingContract": "<venue.exchange address>"
}
The verifyingContract must be fetched from the market’s venue data via GET /markets/:slug. See Venue System. Order Type Definition
{
"Order": [
{ "name": "salt", "type": "uint256" },
{ "name": "maker", "type": "address" },
{ "name": "signer", "type": "address" },
{ "name": "taker", "type": "address" },
{ "name": "tokenId", "type": "uint256" },
{ "name": "makerAmount", "type": "uint256" },
{ "name": "takerAmount", "type": "uint256" },
{ "name": "expiration", "type": "uint256" },
{ "name": "nonce", "type": "uint256" },
{ "name": "feeRateBps", "type": "uint256" },
{ "name": "side", "type": "uint8" },
{ "name": "signatureType", "type": "uint8" }
]
}
Field Reference
| Field | Type | Description |
|---|
salt | uint256 | Unique order identifier (typically timestamp-based) |
maker | address | Checksummed address of the order creator |
signer | address | Same as maker for EOA wallets |
taker | address | 0x000...000 for open orders (any taker) |
tokenId | uint256 | Position ID — YES or NO token from market data |
makerAmount | uint256 | Amount the maker offers, scaled by 1e6 (see Amount Calculation) |
takerAmount | uint256 | Amount the maker wants in return, scaled by 1e6 (always 1 for FOK orders) |
expiration | uint256 | 0 for no expiration |
nonce | uint256 | Order nonce |
feeRateBps | uint256 | Fee rate in basis points |
side | uint8 | 0 = BUY, 1 = SELL |
signatureType | uint8 | 0 = EOA signature |
Order Types
| Type | Description |
|---|
| GTC (Good Till Cancelled) | Remains active until filled or cancelled |
| FOK (Fill or Kill) | Must fill completely or be cancelled |
Amount Calculation
USDC has 6 decimals (1 USDC = 1,000,000 units). Shares are also scaled by 1e6.
GTC (limit orders)
| Side | makerAmount | takerAmount |
|---|
| BUY | price * size * 1e6 (USDC to spend) | size * 1e6 (shares to receive) |
| SELL | size * 1e6 (shares to sell) | price * size * 1e6 (USDC to receive) |
// BUY 10 shares at $0.50
makerAmount = 0.50 * 10 * 1e6 = 5,000,000
takerAmount = 10 * 1e6 = 10,000,000
// SELL 10 shares at $0.50
makerAmount = 10 * 1e6 = 10,000,000
takerAmount = 0.50 * 10 * 1e6 = 5,000,000
FOK (market orders)
| Side | makerAmount | takerAmount |
|---|
| BUY | usdcToSpend * 1e6 | 1 (constant) |
| SELL | sharesToSell * 1e6 | 1 (constant) |
takerAmount = 1 and omit price. The makerAmount represents the raw amount being offered.
The SDKs handle amount scaling automatically — you pass human-readable values (price, size, or makerAmount) and the builder calculates the scaled on-chain amounts.
