lighthouse/book/src/http.md

HTTP API

A Lighthouse beacon node can be configured to expose a HTTP server by supplying the --http flag. The default listen address is localhost:5052.

The following CLI flags control the HTTP server:

• --http: enable the HTTP server (required even if the following flags are provided).
• --http-port: specify the listen port of the server.
• --http-address: specify the listen address of the server.

The API is logically divided into several core endpoints, each documented in detail:

Endpoint	Description
/node	General information about the beacon node.
/beacon	General information about the beacon chain.
/validator	Provides functionality to validator clients.
/consensus	Proof-of-stake voting statistics.
/network	Information about the p2p network.
/spec	Information about the specs that the client is running.
/advanced	Provides endpoints for advanced inspection of Lighthouse specific objects.
/lighthouse	Provides lighthouse specific endpoints.

Please note: The OpenAPI format at SwaggerHub: Lighthouse REST API has been deprecated. This documentation is now the source of truth for the REST API.

Troubleshooting

HTTP API is unavailable or refusing connections

Ensure the --http flag has been supplied at the CLI.

You can quickly check that the HTTP endpoint is up using curl:

curl "localhost:5052/beacon/head"

{"slot":37934,"block_root":"0x4d3ae7ebe8c6ef042db05958ec76e8f7be9d412a67a0defa6420a677249afdc7","state_root":"0x1c86b13ffc70a41e410eccce20d33f1fe59d148585ea27c2afb4060f75fe6be2","finalized_slot":37856,"finalized_block_root":"0xbdae152b62acef1e5c332697567d2b89e358628790b8273729096da670b23e86","justified_slot":37888,"justified_block_root":"0x01c2f516a407d8fdda23cad4ed4381e4ab8913d638f935a2fe9bd00d6ced5ec4","previous_justified_slot":37856,"previous_justified_block_root":"0xbdae152b62acef1e5c332697567d2b89e358628790b8273729096da670b23e86"}