API

Changelog

Public changes to the API contract. Every entry is something a caller can see.

The contract version is the document's info.version — currently 0.8.1. Entries list only public operations; see Versioning for what can change and how you are told.

0.7.0 — 2026-09-26

GEX reference books. GET /v2/gex/{symbol}/reference returns the exact persisted open or preceding-close book for a session (basis=open or basis=prev_close). An unavailable book is a successful response with captured_at: null and no strikes — never a nearby session substituted.
Options flow for API Pro keys. Grouped large trades, a one-symbol strike cross-section, and persisted end-of-day prints. All are bounded: at most 100 events, and a symbol or minimum premium is required.
The REST and WebSocket protobuf schemas are unchanged.

Earlier

Off-exchange views — activity, concentration, profile and composition — are typed, synthetic session-level views, with protobuf bodies on request.
Public protobuf on the GEX grid, chain and bars reads, with the schemas served at /v2/rest-protocol.proto and /v2/ws-protocol.proto.
Deprecated: GET /gex/{underlying}/strikes, the pre-/v2 per-strike read. Use GET /v2/gex/{symbol}/grid.