Quickstart

1. Get Your API Key

curl -X POST "https://api.arbiterapi.com/v1/auth/signup" \
  -H "Content-Type: application/json" \
  -d '{"email": "you@example.com", "password": "your-password"}'

The response includes your API key:

{
  "developer": { "id": "dev_...", "email": "you@example.com" },
  "api_key": "arb_live_abc123..."
}

Save your API key — it’s only shown once at creation time.

2. Make Your First Request

List the top markets by volume:

curl "https://api.arbiterapi.com/v1/markets?limit=5" \
  -H "X-API-Key: YOUR_API_KEY"

[
  {
    "id": "poly_0x24fb...",
    "question": "Will Israel launch a major ground offensive in Lebanon by March 31?",
    "status": "open",
    "outcomes": [
      { "label": "Yes", "price": 0.998, "price_cents": 100 },
      { "label": "No", "price": 0.002, "price_cents": 0 }
    ],
    "volume_24h": 20870737.0,
    "platforms": [{ "platform": "polymarket", "native_id": "0x24fb..." }]
  }
]

3. Get Market Data

Current Price

curl .../v1/markets/poly_0x24fb.../price \
  -H "X-API-Key: YOUR_API_KEY"

OHLCV Candles

curl ".../v1/markets/poly_0x24fb.../candles?interval=1h&start_ts=1774300000" \
  -H "X-API-Key: YOUR_API_KEY"

Trade History

curl ".../v1/markets/poly_0x24fb.../trades?limit=20" \
  -H "X-API-Key: YOUR_API_KEY"

4. Use an SDK

import { ArbiterClient } from 'arbiterapi';

const client = new ArbiterClient({ apiKey: 'YOUR_API_KEY' });

const markets = await client.markets.list({ limit: 10 });
const trades = await client.markets.trades('poly_0x24fb...', { limit: 20 });
const candles = await client.markets.candles('poly_0x24fb...', { interval: '1h' });

from arbiter import ArbiterClient

client = ArbiterClient(api_key="YOUR_API_KEY")

markets = client.markets.list(limit=10)
trades = client.markets.trades("poly_0x24fb...", limit=20)
candles = client.markets.candles("poly_0x24fb...", interval="1h")

Next Steps

Authentication — learn about API key management
Markets — understand market IDs, statuses, and platforms
API Reference — full endpoint documentation

Getting Started

Core Concepts

SDKs

API Reference

Polymarket

Kalshi

Markets

Market Data

Events

Cross-Platform

Sports

Wallets

Whales

Webhooks

WebSocket

Auth & Keys

1. Get Your API Key

2. Make Your First Request

3. Get Market Data

Current Price

OHLCV Candles

Trade History

4. Use an SDK

Next Steps

​1. Get Your API Key

​2. Make Your First Request

​3. Get Market Data

​Current Price

​OHLCV Candles

​Trade History

​4. Use an SDK

​Next Steps

1. Get Your API Key

2. Make Your First Request

3. Get Market Data

Current Price

OHLCV Candles

Trade History

4. Use an SDK

Next Steps