Live OHLCV bars (SSE, up to 10 symbols per connection)

A Server-Sent Events (text/event-stream) feed of live OHLCV bars for up to 10 symbols at one resolution. Authenticate with the Authorization header like every other endpoint; keys are never accepted in the URL.

Availability. Streaming is enabled per account. Until it is, the endpoint answers 403 stream_not_enabled and charges nothing.

Credits. 1 credit per symbol to connect, then 1 credit per symbol for each further minute the stream is open (a 3-symbol stream costs 3 to open and 3 per minute). Every refusal (4xx/5xx before the stream starts) is free. A stream whose connected event never reached the client is refunded.

Events

Event	id:	Payload
connected	no	{symbols, resolution, creditsRemaining, creditsPerMinute, maxDurationSeconds}
bar	yes	{symbol, resolution, t, o, h, l, c, v, bv, sv, uv, coalesced}. On connect: the two latest bars per symbol; then every new bar and every change to the latest one.
stale	no	{symbol, reason: "upstream_unavailable" | "snapshot_failed" | "missed_updates", message}: this server cannot confirm the symbol's bars are current (its live feed connection is down, the initial snapshot could not be read, or updates stopped arriving). Bar events resume after fresh.
fresh	no	{symbol}: the symbol is current again after stale.
symbol_unavailable	no	{symbol, reason: "no_live_bars", message}: no bars yet in the symbol's current session (for example before the pre-market open).
gap	no	{symbol, from, to, message}: on resume, bars in [from, to) are not replayed; fetch them from /v1/history.
credits	no	{remaining, charged} after each per-minute debit.
closed	no	{reason}; the stream ends. insufficient_credits, monthly_cap_reached, account_suspended, key_revoked (an API key on the account was revoked after this stream opened), credit_check_failed, api_paused, account_blocked, stream_disabled (streaming was turned off for the account), stream_error.
reconnect	yes	{reason: "max_duration" | "server_shutdown"}; the stream ends. Reconnect with Last-Event-ID.
: ping	no	SSE comment every 15 s so idle proxies keep the connection.

Bars. t is the bar's open time (Unix seconds, UTC), aligned to resolution like /v1/history. A bar is re-sent whenever it changes; a bar is final once a bar with a later t has been sent for that symbol. Bars are the extended-hours session (the live feed has no regular-hours filter). Freshness: the stream follows the same live bar feed as the Skylit app's charts. The in-progress bar updates about once a second while the symbol trades, and each minute's final values follow when it closes.

Backpressure. A client that reads slower than bars change is never queued behind: it receives the symbol's newest state, and coalesced says how many updates it skipped since its previous bar for that symbol (usually 0). A client that reads nothing for 30 seconds is disconnected.

Resume. Each bar and reconnect carries an id: that is the connection's position in every symbol: SYMBOL:t pairs separated by commas (SPY:1790000000,QQQ:1790000060). Per symbol it never decreases. Reconnect with header Last-Event-ID: <last id> (EventSource does this automatically) or ?lastEventId=, and the same resolution: bars from that time on are replayed from the current session (the bar at exactly that time is re-sent). Bars before the current session, or more than 500 per symbol, get a gap event instead.

Limits. At most 10 symbols per stream. Concurrent streams per account are limited per server (429 stream_limit_reached with Retry-After). Streams last at most 60 minutes, then get reconnect.