Orderbook
Live orderbook data proxied and normalized from source platforms. Returns the full bid/ask ladder for a given market. Kalshi, Polymarket, Opinion, and Predict.fun are supported. Returns 404 when no orderbook data is available for the market.
/v2/orderbookQuery Parameters
polymarket | kalshi | opinion (required).
Platform-native market ID (required).
Response Schema
Platform-native market ID.
Platform name.
Timestamp of the orderbook snapshot (ISO 8601).
YES outcome orderbook.
Bid levels.
Price level.
Size/quantity at this level.
Ask levels.
Price level.
Size/quantity at this level.
NO outcome orderbook.
Bid levels.
Price level.
Size/quantity at this level.
Ask levels.
Price level.
Size/quantity at this level.
Authentication
API Key
To secure your requests, we strongly recommend passing your API key via the X-API-Key header. This prevents sensitive keys from being exposed in access logs or browser history.
X-API-Key: pmx_test_5e8f...Rate Limits
API rate limits are enforced based on the tier associated with your API key. Limits are tracked on two dimensions: requests per second and requests per month. Each completed request counts toward the global monthly quota. Separate endpoint-group monthly limits (matched markets, arbitrage, EV) only advance when the response body has success: true.
Usage is returned on responses via headers such as:
X-RateLimit-Limit-Second: 10X-RateLimit-Remaining-Second: 9X-RateLimit-Limit-Month: 1000X-RateLimit-Remaining-Month: 842Example (endpoint-group, when applicable)X-RateLimit-Limit-Arb-Month: 500X-RateLimit-Remaining-Arb-Month: 412If you exceed a rate limit, the API returns a 429 status with a Retry-After header indicating when you can resume.
Request
Live API Key
Parameters
Response
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