The public Heimdall endpoints:
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https://heimdall-api.polygon.technology (mainnet)
are operated on a best-effort basis. There is no SLA attached to them — no uptime target, no latency guarantee, and no support or response-time commitment. They exist as a convenience for exploration, debugging, and light integration work, not as production infrastructure.
Concretely, that means:
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availability, latency, and rate limits can change without notice
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the endpoints may be throttled, restricted, or taken offline — planned or otherwise — without an announcement
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degradation is not tracked or escalated as an incident
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historical and archival query support is not guaranteed
If you have a production dependency on Heimdall data, please don’t build on these endpoints. Two supported paths:
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Run your own Heimdall node. This is the recommended option if you need reliability, consistent latency, or archival queries: full node setup guide (https://docs.polygon.technology/pos/how-to/full-node/full-node-binaries)
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Use a commercial RPC provider that serves Polygon PoS consensus data under its own SLA.
If you’re not sure whether your integration depends on these endpoints, check for calls to heimdall-api.polygon.technology in your logs, then open a ticket at support.polygon.technology for further discussion.