generated: '2026-08-14'
method: searched
source: >-
  https://symbl.ai/company/pricing/ (live, HTTP 200) and Symbl.ai's open-sourced documentation
  at https://github.com/symblai/symbl-docs (FAQ, Create Tracker reference, Error Codes).
docs:
- https://symbl.ai/company/pricing/
- https://github.com/symblai/symbl-docs/blob/master/docs/faq.md
- https://github.com/symblai/symbl-docs/blob/master/docs/management-api/trackers/create-tracker.md
- https://github.com/symblai/symbl-docs/blob/master/docs/developer-tools/errors.md
notes: >-
  Symbl.ai governed load by CONCURRENCY, not by requests-per-window: a plan buys a number of
  simultaneous Streaming connections and simultaneous Async jobs, and exceeding it returns 429.
  The per-tier concurrency ceilings are still published on the live pricing page today; the
  per-API concurrency, payload and object ceilings come from the open-sourced docs. NO RUNTIME
  RATE-LIMIT HEADERS were ever documented — no X-RateLimit-*, no RateLimit-*, no Retry-After —
  so a client could not read remaining budget or a back-off hint from a response and had to
  count its own in-flight work. That gap is the finding. All endpoints described here sit on
  api.symbl.ai, which no longer resolves (see lifecycle/symblai-lifecycle.yml).
limit_count: 8
headers:
  documented: false
  ratelimit_headers: []
  retry_after: false
  note: >-
    Searched the full open-sourced documentation set for X-RateLimit, RateLimit and Retry-After;
    no rate-limit response header of any kind is documented. Exhaustion is signalled only by the
    HTTP status code and a message body.
exhaustion:
  status_code: 429
  meaning: Too Many Requests — concurrency ceiling for the API or the account was exceeded.
  body: JSON object with a `message` field.
  remediation: >-
    Wait for in-flight jobs or connections to complete; Symbl directs accounts needing more
    concurrency to support@symbl.ai.
limits:
- id: streaming-concurrency-free
  scope: per-account
  api: Streaming API
  window: concurrent
  limit: 5
  unit: concurrent connections
  plan: Free
  source: https://symbl.ai/company/pricing/
- id: streaming-concurrency-payg
  scope: per-account
  api: Streaming API
  window: concurrent
  limit: 50
  unit: concurrent connections
  plan: PayG
  source: https://symbl.ai/company/pricing/
- id: streaming-concurrency-trial-docs
  scope: per-account
  api: Streaming API
  window: concurrent
  limit: 2
  unit: concurrent connections
  plan: trial (as documented)
  source: https://github.com/symblai/symbl-docs/blob/master/docs/faq.md
  note: >-
    The archived FAQ states 2 concurrent connections on trial and 50 after upgrade; the live
    pricing page states 5 on Free and 50 on PayG. Both published figures are recorded — they
    disagree, and the docs figure is the older of the two.
- id: async-job-concurrency
  scope: per-account
  api: Async API
  window: concurrent
  limit: 50
  unit: concurrent jobs
  plan: paid
  trial_limit: 2
  source: https://github.com/symblai/symbl-docs/blob/master/docs/faq.md
- id: tracker-management-concurrency
  scope: per-endpoint
  api: Management API — Create/Update Tracker
  window: concurrent
  limit: 1
  unit: concurrent request
  status_on_exhaustion: 429
  source: https://github.com/symblai/symbl-docs/blob/master/docs/management-api/trackers/create-tracker.md
- id: tracker-request-body-size
  scope: per-request
  api: Management API — Create/Update Tracker
  limit: 1
  unit: MB request body
  status_on_exhaustion: 413
  source: https://github.com/symblai/symbl-docs/blob/master/docs/management-api/trackers/create-tracker.md
- id: trackers-per-account
  scope: per-account
  api: Management API — Trackers
  limit: 500
  unit: trackers
  source: https://github.com/symblai/symbl-docs/blob/master/docs/faq.md
  note: Raised to 500 per account on 2022-02-08 per the changelog.
- id: async-media-duration
  scope: per-request
  api: Async API
  limit: 4
  unit: hours of media per file
  source: https://github.com/symblai/symbl-docs/blob/master/docs/faq.md
related_ceilings:
- api: Management API — Trackers
  ceiling: 50 vocabulary terms per Tracker (5 recommended minimum)
  source: https://github.com/symblai/symbl-docs/blob/master/docs/faq.md
- api: Subscribe API (Beta)
  ceiling: 10,000 listen-only participants per call
  source: https://github.com/symblai/symbl-docs/blob/master/docs/subscribe-api.md
x-evidence:
  checked: '2026-08-14'
  probes:
  - url: https://symbl.ai/company/pricing/
    http_status: 200
  - url: https://raw.githubusercontent.com/symblai/symbl-docs/master/docs/faq.md
    http_status: 200
  - url: https://api.symbl.ai/
    http_status: 0
    result: NXDOMAIN — no live response could be observed to confirm headers empirically.