---
title: "PostValidatorSyncCommitteeSelections"
method: POST
path: "/{apiKey}/eth/v1/validator/sync_committee_selections"
---

# PostValidatorSyncCommitteeSelections

`POST /{apiKey}/eth/v1/validator/sync_committee_selections`

Determine if a distributed validator has been selected to make a sync committee contribution.

Submit sync committee selections to a DVT middleware client. It returns the threshold aggregated sync 
committee selection. This endpoint should be used by a validator client running as part of a distributed 
validator cluster, and is implemented by a distributed validator middleware client. This endpoint is 
used to exchange partial selection proofs (slot signatures) for combined/aggregated selection proofs to 
allow a validator client to correctly determine if any of its validators has been selected to perform a 
sync committee contribution (sync aggregation) duty in a slot. Validator clients running in a distributed validator cluster must query this endpoint
at the start of each slot for all validators that are included in the current sync committee. Consensus
clients need not support this endpoint and may return a 501.

## Path parameters

- `apiKey` string, required — <style> .custom-style { color: #048FF4; } </style> For higher throughput, please <span class="custom-style"><a href="../docs/quick-start-guide#-creating-your-api-key-on-the-zan-platform" target="_blank">create your own API key</a></span>.

## Request body

- object[]
  - `validator_index` string, required — Index of the validator
  - `slot` string, required — The slot at which validator is assigned to produce a sync committee contribution
  - `subcommittee_index` string, required — SubcommitteeIndex to which the validator is assigned
  - `selection_proof` string, hex, required — The `slot_signature` calculated by the validator for the upcoming sync committee slot

## Response `200`

Successful response

- object
  - `data` object[], required
    - `validator_index` string, required — Index of the validator
    - `slot` string, required — The slot at which validator is assigned to produce a sync committee contribution
    - `subcommittee_index` string, required — SubcommitteeIndex to which the validator is assigned
    - `selection_proof` string, hex, required — The `slot_signature` calculated by the validator for the upcoming sync committee slot

---

[API](https://skmtc.dev/zan/apis/zan-getnftmetadata.md) · [All operations](https://skmtc.dev/zan/apis/zan-getnftmetadata/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/zan/zan-getnftmetadata/revisions/be8fa2338895/schema)