Prompt
Are there any websocket event stream APIs that support archive data and 99.9% uptime?
Latest observation
Yes — but the exact answer depends on what you mean by archive data and whether you need true WebSocket streaming versus streaming + historical backfill.
Common providers that offer WebSocket market/data streams and archived/historical data
- Polygon.io
- WebSocket real-time feeds
- Historical/aggregated data and some event archives
- Strong uptime claims / SLA options on higher tiers
- Intrinio
- WebSocket market data
- Historical datasets available
- Enterprise-focused reliability
- Twelve Data
- WebSocket streaming
- Historical data endpoints
- Uptime/SLA depends on plan
- Finnhub
- WebSocket streams
- Historical data via API
- Generally aimed at broad coverage, not always deep archives
- Tiingo
- Real-time + historical data
- More REST-centric, but useful for archive/backfill workflows
- Alpaca
- WebSocket for trading/data
- Historical data APIs
- Good for equities/crypto depending on coverage
- CoinAPI / Kaiko / CryptoCompare
- For crypto especially
- WebSocket + extensive historical/archive data
- Enterprise options often include reliability commitments
About “99.9% uptime”
- 99.9% uptime is usually only guaranteed via enterprise SLA, not standard self-serve plans.
- Many providers may advertise high reliability, but the formal SLA is often:
- only on enterprise contracts
- only for specific endpoints/regions
- excluding maintenance windows and third-party dependencies
If archive data is critical
You often want a provider that supports:
- WebSocket live stream
- Historical REST backfill
- Bulk archive downloads or full-day dumps
- SLA-backed enterprise support
Practical recommendation
If you need both WebSocket event streaming and archive data with 99.9% uptime, the best path is usually:
- Polygon.io for equities/options/crypto
- Kaiko or CoinAPI for crypto archives
- Intrinio for enterprise market data
- Alpaca if you want trading + data in one stack
If you want, I can also give you a shortlist by asset class:
- stocks
- crypto
- forex
- options
- news/events
and include which ones actually offer formal SLA/99.9% guarantees.
Observation history
How did Obsurfable measure this prompt?
Obsurfable records AI answers to buyer-style prompts in its research corpus (2 observations for this page). Metrics are distributions over observations, not a single static ranking.
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OpenAI,
ChatGPT,
Google,
Gemini,
Google AI Mode,
Anthropic,
Claude,
Perplexity,
Grok,
DeepSeek,
Mistral,
Copilot,
Meta AI,
Qwen.
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