Polygon Says Heimdall Public RPC Endpoints Have No SLA, Not for Production Use

Polygon has issued an official notice stating that its Heimdall public RPC endpoint, heimdall-api.polygon.technology, is operated on a best-effort basis and carries no service-level agreement (SLA). The endpoint offers no uptime target, no latency guarantee, and no commitment to support response times. It is intended only for exploration, debugging, and lightweight integration work, and is not suitable as production infrastructure. Polygon warns that availability, latency, and rate limits on these endpoints may change at any time, and that they may be throttled, restricted, or taken offline without prior notice. Any degradation will not be tracked or escalated as an incident. Developers relying on Heimdall data in production environments are advised not to build on these public endpoints. To determine whether their services depend on the endpoints, developers can check logs for calls containing heimdall-api.polygon.technology. The announcement underscores the distinction between public convenience endpoints and production-grade infrastructure, urging developers to plan accordingly.