---
title: "Provide beacon node with registrations for the given validators to the external builder network."
method: POST
path: "/eth/v1/validator/register_validator"
tags: ["Validator"]
---

# Provide beacon node with registrations for the given validators to the external builder network.

`POST /eth/v1/validator/register_validator`

## Request

- Base URL: `eth2-beacon-mainnet.nodereal.io/v1/api_key` (relative, and the document’s source URL is not known)
- URL: `eth2-beacon-mainnet.nodereal.io/v1/api_key/eth/v1/validator/register_validator`
- Auth: none declared

Prepares the beacon node for engaging with external builders. The
information will be sent by the beacon node to the builder network. It is
expected that the validator client will send this information periodically
to ensure the beacon node has correct and timely registration information
to provide to builders. The validator client should not sign blinded beacon
blocks that do not adhere to their latest fee recipient and gas limit
preferences.

Note that requests containing currently inactive or unknown validator
pubkeys will be accepted, as they may become active at a later epoch.

## Request body

- object[]
  - `message` object: The `ValidatorRegistration` object from the Builder API specification.
    - `fee_recipient` string: An address on the execution (Ethereum 1) network.
    - `gas_limit` string: Preferred gas limit of validator.
    - `timestamp` string: Unix timestamp of registration.
    - `pubkey` string: The validator's BLS public key, uniquely identifying them. _48-bytes, hex encoded with 0x prefix, case insensitive._
  - `signature` string

## Response `200`

Registration information has been received.

## Other responses

- `400`: Invalid request syntax.
- `500`: Beacon node internal error.

---

[API](https://skmtc.dev/nodereal/apis/eth-beacon-node-api.md) - [All operations](https://skmtc.dev/nodereal/apis/eth-beacon-node-api/llms.txt) - [OpenAPI document](https://skmtc.dev/nodereal/apis/eth-beacon-node-api/revisions/1878ea8657a1?raw)