API ReferenceQuant Signals
Stream decisions
/api/v3/stream/decisions- Plan
- Starter and up
- Price
- 3 credits per connection
- MCP tool
- REST only (stream)
SSE stream of decision-lifecycle events. While the decision producer is not running the connect answers 503 upstream_unavailable (error_code producer_unavailable) instead of an empty stream. ready=true is the transport only; the ready frame's producer_live / producers say whether the decision producer is running.
Parameters
Query
symbolsstringOptionalResponse
A 200 opens a Server-Sent Events stream (text/event-stream) and keeps it open: frames of event: and data: <JSON> lines, with heartbeats while the feed is quiet. Real-Time Streaming describes every event and when each feed carries data.
The connection is billed once, when it opens, and stays billed if it then closes on an error event, so reconnect with backoff. Streams are REST only: MCP cannot relay a stream.
Errors
No error is billed. The body is { "ok": false, "error", "detail", "request_; read the code from error.
| Error | Meaning |
|---|---|
400 invalid_ticker | The request is malformed, for example a ticker that is not a symbol: invalid_ticker, refused before any credit is reserved, with param naming the parameter. Not billed. |
401 unauthorized | Missing or invalid API key. |
402 plan_required | Your plan does not include this tool, you are out of credits, or your workspace's spend cap paused its keys. plan_required names the plan that unlocks the tool; usage_exceeded means the credit balance is spent; spend_cap_reached means the key is paused until the cap resets or is raised: detail names the cap and the reset, cap_usd and resets_at (ISO 8601) carry them, and doc_url links pricing and credits. Not billed. |
403 scope_denied | This API key is limited to some products and this tool is not one of them. product names the tool's product and scopes the key's products. An upgrade does not change it: use a key whose scopes include the product, or change this key's scopes. Not billed. |
404 not_found | No such resource. Not billed. |
422 validation | A parameter is missing, out of range or the wrong type; param names it. Not billed. |
429 rate_limited | Your plan's rate limit is spent for this window. Retry after Retry-After seconds. Not billed. |
503 paid_ | The data could not be served completely right now; retry later. Not billed. |
504 request_timeout | The request ran past the server's time budget; retry. Not billed. |
This table lists what the spec declares for this route. Error responses lists every code FIRM sends, with when to retry.
Guides
Read the Real-Time Streaming guide for this endpoint's fields and examples.