Resumable real-time event stream (SSE)
Server-Sent Events stream of the live feed envelopes the platform already broadcasts (whale-trade pulses and other public/Pro feed events). Forwards the same backend-owned envelope shape as the internal feed; no provider data is recomputed. Authenticated via the oxi_sk Bearer key like every other /api/v1 endpoint, and limited to a small number of concurrent connections per API key and a cluster-wide ceiling across all keys (HTTP 429 with Retry-After when either cap is exceeded; HTTP 503 with Retry-After if the admission backend is briefly unavailable). Each delivered frame carries an SSE id equal to the envelope sequence; reconnect with the Last-Event-ID header (or the last_event_id / seq query fallback) to replay the missed window before resuming live. When the requested resume point predates the retained window the stream emits one resync marker event (event: resync) instead of silently skipping frames. Idle connections receive periodic ': keep-alive' comment lines. This is a long-lived response: keep the connection open and read frames as they arrive.
Query parameters
Query-string fallback for the Last-Event-ID resume cursor when the client cannot set the request header. Numeric sequence id; non-numeric or absent attaches live with no replay.
Alias for last_event_id. Numeric sequence id to resume after; non-numeric or absent attaches live with no replay.
Optional per-connection subscribe-time filter. Comma-separated list of frame wire types (the SSE 'type' discriminator, e.g. WhaleTradesInserted,wallet_grade_changed); a frame passes only when its type is in the set. An unknown token returns HTTP 400 naming the offending value. An empty/all-whitespace value is treated as absent (no constraint). Applied to BOTH the replay window and live frames, and always AFTER the per-subscriber privacy gate, so it can never widen visibility beyond what the key may already see. Combines with condition_id and min_grade as a logical AND; an absent param adds no constraint.
Optional per-connection subscribe-time filter. Raw provider condition_id or mkt_-prefixed market id (normalized the same way the other v1 market endpoints normalize). A frame passes only when it carries a matching condition_id field; frames that carry no condition_id (e.g. whale-pulse events) are EXCLUDED while this is set. An empty value after normalization returns HTTP 400. Combines with event and min_grade as a logical AND; an absent param adds no constraint.
Optional per-connection subscribe-time filter. A frame passes only when it carries a grade field whose grade is better-or-equal to this minimum (S is best). Frames that carry no grade field (every frame except wallet_grade_changed) are EXCLUDED while this is set. An invalid grade returns HTTP 400. Combines with event and condition_id as a logical AND; an absent param adds no constraint.
Headers
Sequence id of the last frame the client successfully processed. The stream replays the strictly-newer window before resuming live. Browser EventSource clients send this automatically on reconnect. Omit to attach live from now.
Response
Open Server-Sent Events stream. The body is an unbounded text/event-stream of frames; each data frame is a JSON feed envelope (with seq, published_at, type, and event-specific fields) and carries an SSE id equal to seq. resync marker frames use event: resync.