generated: '2026-08-14' method: probed source: >- Live DNS/HTTP probes of every Symbl.ai host on 2026-08-14, plus Symbl.ai's own acquisition announcement and its open-sourced documentation repository. summary: >- Symbl.ai's standalone developer platform is DECOMMISSIONED. Symbl.ai was acquired by Invoca (announced 2025-05-28) and every host that carried the developer program — the API itself, the documentation site, the platform console, the Nebula playground and the integrations directory — has since been removed from DNS. The marketing site, the pricing page, the compliance page, the blog, the public Postman workspaces and the client SDKs on npm / PyPI / pkg.go.dev are all still live, so the company still markets the product while no documented endpoint is reachable and no account can be created. status: decommissioned acquisition: acquirer: Invoca announced: '2025-05-28' announcement: https://symbl.ai/developers/blog/symbl-ai-is-joining-invoca/ acquirer_post: https://www.invoca.com/blog/the-future-of-ai-powered-buying-journeys-invocas-acquisition-of-symbl-ai note: >- Neither announcement states a sunset date for the developer platform, and no deprecation notice, migration guide or Sunset/Deprecation header policy was found on any live Symbl.ai page. The platform's removal is observable only by probing the hosts. # What the developer platform WAS, recorded from Symbl.ai's own open-sourced documentation. # None of these surfaces is reachable today. historical_surface: api_base: https://api.symbl.ai products: - name: Async API description: Upload audio, video, text or a URL for asynchronous conversation processing. - name: Streaming API description: WebSocket real-time speech-to-text and insights. - name: Telephony API description: PSTN / SIP dial-in for live conversation intelligence. - name: Conversation API description: Read topics, action items, questions, follow-ups, entities, sentiment, transcript. - name: Management API description: CRUD for Trackers and Conversation Groups. - name: Subscribe API (Beta) description: Listen-only WebSocket subscription to an existing conversation. - name: Experience API / Pre-built UI description: Hosted summary and trackers-and-analytics UI. - name: Nebula LLM description: Symbl.ai's conversation-tuned LLM and embeddings. authentication: style: token-exchange token_endpoint: https://api.symbl.ai/oauth2/token:generate credentials: appId + appSecret exchanged for a bearer accessToken token_lifetime_seconds: 86400 docs: https://github.com/symblai/symbl-docs/blob/master/docs/developer-tools/authentication.md note: >- Documented as "OAuth 2.0" by Symbl but implemented as a bespoke JSON credential exchange at a non-standard path, not an RFC 6749 grant. Recorded here rather than as a standalone authentication artifact because the endpoint host no longer resolves. event_surface: websocket: - wss://api.symbl.ai/v1/realtime/insights/{connectionId} - wss://api.symbl.ai/v1/subscribe/{connectionId} webhooks: style: per-request callback parameter: webhookUrl description: >- Async API jobs accept an optional webhookUrl; Symbl POSTs jobId + status on every job status change. No subscription registry, no signature scheme and no event catalog were published, so no AsyncAPI or Webhooks artifact is emitted. docs: https://github.com/symblai/symbl-docs/blob/master/docs/async-api/overview/audio/post-audio-url.md # Every developer-facing host, probed 2026-08-14. host_probes: - host: symbl.ai url: https://symbl.ai/ status: 200 state: live role: marketing site (WordPress) - host: www.symbl.ai url: https://www.symbl.ai/ status: 200 state: live - host: api.symbl.ai url: https://api.symbl.ai/ status: 0 dns: NXDOMAIN state: gone role: API base for every documented endpoint - host: docs.symbl.ai url: https://docs.symbl.ai/ status: 0 dns: NXDOMAIN state: gone role: developer documentation and API reference - host: platform.symbl.ai url: https://platform.symbl.ai/#/signup status: 0 dns: NXDOMAIN state: gone role: account console and credential issuance (still linked from the live pricing page) - host: nebula.symbl.ai url: https://nebula.symbl.ai/ status: 0 dns: NXDOMAIN state: gone role: Nebula LLM playground (still linked from the live site footer) - host: integrations.symbl.ai url: https://integrations.symbl.ai/ status: 0 dns: NXDOMAIN state: gone role: integrations directory (still linked from /developers/) - host: status.symbl.ai url: https://status.symbl.ai/ status: 0 dns: NXDOMAIN state: never-published-or-gone role: probed for a status page; does not resolve status_page: published: false probed: - url: https://status.symbl.ai/ result: NXDOMAIN note: No status page was found on any live Symbl.ai surface. No StatusPage pointer is emitted. deprecation_policy: published: false sunset_header: unknown deprecation_header: unknown note: >- No versioning or deprecation policy, and no RFC 8594 Sunset/Deprecation header documentation, exists on any live or archived Symbl.ai page. No Deprecation pointer is emitted. The platform was withdrawn without a published notice. sla: published: false note: >- "Enterprise support & SLAs" is named as an Enterprise-tier benefit on the live pricing page, but no SLA document is published. # What is still genuinely live and public. surviving_artifacts: - kind: documentation url: https://github.com/symblai/symbl-docs state: live frozen: '2022-07-19' note: >- Symbl.ai deliberately open-sourced its Docusaurus documentation. The repository is public and readable and is now the only surviving API reference; last push 2022-07-19, and its every internal link points at the dead docs.symbl.ai host. - kind: code-samples url: https://github.com/symblai/getting-started-samples state: live last_commit: '2023-04-03' - kind: sdks url: packages/symblai-packages.yml state: live note: Last SDK releases are September–November 2024, all predating the platform's removal. - kind: postman url: https://www.postman.com/symbldotai/workspace/symbl-ai/overview state: live note: First-party public workspaces under the verified publisher handle symbldotai. - kind: pricing url: https://symbl.ai/company/pricing/ state: live note: Still sells Free / PayG / Enterprise tiers and links Sign-up to the dead console. - kind: compliance url: https://symbl.ai/platform/security/overview/ state: live x-evidence: checked: '2026-08-14' method: >- curl -sSL -o /dev/null -w '%{http_code}' per host and dig +short per subdomain; a status of 0 with dns NXDOMAIN means the name did not resolve at all.