---
title: "Submit a microblock (Epoch 2.x)"
method: POST
path: "/v2/microblocks"
tags: ["Blocks", "Microblocks"]
---

# Submit a microblock (Epoch 2.x)

`POST /v2/microblocks`

Submit a microblock to the node for validation and relay.
The body **must** be the SIP-003 binary serialization of a `Microblock`
and sent with `Content-Type: application/octet-stream`.

## Response `200`

Index-block hash of the accepted microblock

- string — 32-byte block-header hash (hex)

## Other responses

- `400` — Bad request
- `404` — Not found
- `500` — Internal Server Error

## Changes

- **2025-07-09** `04a9a0b50aa3` — 1 info
  - endpoint added
- **2025-07-08** `488dd3b80020` — 1 breaking
  - api path removed without deprecation
- **2025-07-08** `170414634c90` — 1 info
  - endpoint added
- **2025-06-26** `2fc5956efe3d` — 1 breaking
  - api path removed without deprecation
- **2025-06-25** `87a7fe30e436` — 1 info
  - the request's body minLength was decreased from `1` to `0`

[Change history](https://skmtc.dev/stacks-network/apis/stacks-3-0-rpc-api/changes/v2/microblocks/post.md)

---

[API](https://skmtc.dev/stacks-network/apis/stacks-3-0-rpc-api.md) · [All operations](https://skmtc.dev/stacks-network/apis/stacks-3-0-rpc-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/stacks-network/stacks-3-0-rpc-api/revisions/5b08eae90eeb/schema)