---
title: "Get Block Payload by Block ID."
method: GET
path: "/blocks/{id}/payload"
tags: ["Blocks"]
---

# Get Block Payload by Block ID.

`GET /blocks/{id}/payload`

Get a block payload data by the provided block ID.

## Path parameters

- `id` string, hexadecimal, required — A 32-byte unique identifier for an entity.

## Query parameters

- `expand` string[]
- `select` string[]

## Response `200`

OK

- BlockPayload
  - `collection_guarantees` CollectionGuarantee[], required
    - `collection_id` string, hexadecimal, required — A 32-byte unique identifier for an entity.
    - `signer_ids` Identifier[], required
    - `signature` string, byte, required — A variable length signature.
    - `reference_block_id` string, hexadecimal, required — A 32-byte unique identifier for an entity.
    - `cluster_chain_id` string, required
  - `block_seals` BlockSeal[], required
    - `block_id` string, hexadecimal, required — A 32-byte unique identifier for an entity.
    - `result_id` string, hexadecimal, required — A 32-byte unique identifier for an entity.
    - `final_state` string, hexadecimal, required — The root hash of the state tree.
    - `aggregated_approval_signatures` AggregatedSignature[], required
      - `verifier_signatures` Signature[], required
      - `signer_ids` Identifier[], required

## Other responses

- `400` — Bad Request
- `404` — Not Found
- `500` — Internal Server Error

## Changes

- **2025-09-18** `04fb304815f2` — 1 breaking
  - the `collection_guarantees/items/cluster_chain_id` response's property type/format changed from ``/`` to `string`/`` for status `200`
- **2025-07-28** `ff980847e35e` — 1 info
  - the response property `collection_guarantees/items/cluster_chain_id` became required for the status `200`
- **2025-07-28** `7f4afb83f61f` — 1 breaking, 1 info
  - removed the required property `collection_guarantees/items/chain_id` from the response with the `200` status
  - added the optional property `collection_guarantees/items/cluster_chain_id` to the response with the `200` status
- **2025-07-28** `4c0b3c5bd5db` — 2 info
  - added the required property `collection_guarantees/items/chain_id` to the response with the `200` status
  - added the required property `collection_guarantees/items/reference_block_id` to the response with the `200` status
- **2023-09-07** `2830f8479f6b` — 1 info
  - endpoint added

[Full history](https://skmtc.dev/onflow/apis/access-api/changes/blocks/:id/payload/get.md)

---

[API](https://skmtc.dev/onflow/apis/access-api.md) · [All operations](https://skmtc.dev/onflow/apis/access-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/onflow/access-api/revisions/fd121c1fddf8/schema)