Base L2/On-chain prediction markets

Limitless API SDK for
Python & TypeScript

Trade binary and NegRisk multi-outcome markets on Limitless — the on-chain prediction market on Base. Three lines to connect, zero transaction boilerplate.

Read the docsGitHub
pip install pmxt|npm i pmxtjs

→ Get your API key at pmxt.dev/dashboard

import pmxt

# Read Limitless via PMXT's hosted catalog — no Base wallet needed
client = pmxt.Limitless(pmxt_api_key="pmxt_live_...")

# Fetch live markets and prices
events = client.fetch_events(query="BTC above 100k")
market = events[0].markets[0]

print(f"{market.title}: Yes {market.yes.price}¢ / No {market.no.price}¢")

Without pmxt

8 on-chain steps before your first trade

Limitless settles trades on-chain on Base L2. Every order requires wallet management, EIP-712 signing, gas estimation, and transaction submission. pmxt handles all of it.

  1. 1Configure Base L2 RPC endpoint
  2. 2Load wallet & manage private key
  3. 3Construct EIP-712 typed data for signing
  4. 4Build contract call data for the CLOB
  5. 5Estimate gas & set gas price on Base
  6. 6Sign and submit transaction on-chain
  7. 7Wait for block confirmation
  8. 8Parse on-chain event logs & decode response

With pmxt: read via hosted catalog, trade via self-hosted SDK.

client = pmxt.Limitless(pmxt_api_key="pmxt_live_...") # reads
exchange = pmxt.Limitless(private_key="0x...") # trades

Trading path: /docs/guides/self-hosted

How Limitless works

On-chain prediction markets on Coinbase's Base L2

L2

Base L2 settlement

All trades settle on Base, Coinbase's Ethereum L2. Gas costs are a few cents per transaction. Collateral is held in USDC — every Yes + No pair is backed by $1.00.

NR

NegRisk multi-outcome

Unique to Limitless: category markets where outcomes are mutually exclusive. "Who wins the election?" with 5+ candidates, each with its own orderbook, and linked No shares for arbitrage.

30m

Hourly markets

30-minute and 60-minute markets on crypto prices, stocks, and commodities with instant on-chain resolution. Built for short-term strategies that no other platform offers.

How it compares

Limitless vs Polymarket vs Kalshi

Limitless
PolymarketKalshi
BlockchainBase (Coinbase L2)PolygonNone (centralized)
SettlementUSDC on-chainUSDC on-chainUSD (fiat)
Auth modelAPI key + EIP-712EIP-712 + CLOB headersRSA-PSS signing
Market typesBinary + NegRisk multi-outcomeBinary + multi-outcomeBinary event contracts
Hourly markets30 & 60 min resolutionNoNo
Trading modelCLOB (on-chain settlement)CLOB (hybrid)Orderbook (centralized)
Native tokenLMTS (fee discounts, governance)NoneNone
US accessUnrestrictedLimited betaMost states

pmxt supports all three exchanges with a single unified API. Switch between them by changing one line.

Why pmxt

One SDK for every prediction market

Zero on-chain boilerplate

Base RPC, wallet management, EIP-712 signing, gas estimation — all handled. You call create_order(), pmxt submits the transaction.

Multi-exchange

Switch from Limitless to Polymarket or Kalshi by changing one line. Same methods, same types, different exchange.

Type-safe

Full TypeScript definitions and Pydantic models in Python. NegRisk markets, hourly markets, and standard binaries all have dedicated types.

WebSocket streaming

Subscribe to Limitless price changes and orderbook updates in real-time via wss://ws.limitless.exchange.

Same fetch_events() across every exchange

PolymarketKalshiLimitless

Limitless API FAQ

Common questions about using pmxt with Limitless Exchange.

Start building with Limitless

Connect to Base L2 and place your first on-chain trade in under a minute.

Get startedView source