---
title: "Produce a sync committee contribution"
method: GET
path: "/eth/v1/validator/sync_committee_contribution"
tags: ["ValidatorRequiredApi", "Validator"]
---

# Produce a sync committee contribution

`GET /eth/v1/validator/sync_committee_contribution`

## 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/sync_committee_contribution`
- Auth: none declared

Requests that the beacon node produce a sync committee contribution.

## Query parameters

- `slot` string, required
- `subcommittee_index` string, required
- `beacon_block_root` string, required

## Response `200`

Success response

- object
  - `data` object
    - `slot` string: The slot at which the validator is providing a sync committee contribution.
    - `beacon_block_root` string: Block root for this contribution.
    - `subcommittee_index` string: The index of the subcommittee that the contribution pertains to.
    - `aggregation_bits` string: A bit is set if a signature from the validator at the corresponding index in the subcommittee is present in the aggregate `signature`.
    - `signature` string: Signature by the validator(s) over the block root of `slot`

## Other responses

- `400`: Invalid request syntax.
- `404`: Not found
- `500`: Beacon node internal error.
- `503`: Beacon node is currently syncing, try again later.

---

[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)