# CoAP

**Canonical:** https://apis.io/apis/realtime/coap/  
**Provider:** Realtime — https://apis.io/providers/realtime/  
**Documentation:** https://datatracker.ietf.org/doc/html/rfc7252

CoAP is one of 26 APIs that [Realtime](https://apis.io/providers/realtime/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include CoAP, IoT, Constrained Devices, Protocol, and Standard.

The Constrained Application Protocol, defined in IETF RFC 7252, is a RESTful protocol for constrained devices over UDP, with an Observe extension (RFC 7641) that provides realtime resource notification. CoAP is used in industrial IoT and LPWAN deployments where MQTT's TCP overhead is undesirable.

## Machine-readable artifacts (2)

- **Specification** — https://datatracker.ietf.org/doc/html/rfc7252
- **Specification** — https://datatracker.ietf.org/doc/html/rfc7641

## Other Realtime APIs (12)

- [WebSocket](https://apis.io/apis/realtime/websocket/)
- [Server-Sent Events (SSE)](https://apis.io/apis/realtime/server-sent-events/)
- [WebRTC](https://apis.io/apis/realtime/webrtc/)
- [MQTT](https://apis.io/apis/realtime/mqtt/)
- [gRPC Streaming](https://apis.io/apis/realtime/grpc-streaming/)
- [GraphQL Subscriptions](https://apis.io/apis/realtime/graphql-subscriptions/)
- [WebTransport](https://apis.io/apis/realtime/webtransport/)
- [Ably](https://apis.io/apis/realtime/ably/)
- [PubNub](https://apis.io/apis/realtime/pubnub/)
- [Pusher](https://apis.io/apis/realtime/pusher/)
- [LiveKit](https://apis.io/apis/realtime/livekit/)
- [Daily](https://apis.io/apis/realtime/daily/)

## Tags

CoAP, IoT, Constrained Devices, Protocol, Standard

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/realtime/coap/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/realtime/.