---
title: "Accept Block Trade Proposal"
method: POST
path: "/communications/block-trade-proposals/{block_trade_proposal_id}/accept"
tags: ["communications"]
---

# Accept Block Trade Proposal

`POST /communications/block-trade-proposals/{block_trade_proposal_id}/accept`

## Request

- Base URL: `https://external-api.kalshi.com/trade-api/v2`
- URL: `https://external-api.kalshi.com/trade-api/v2/communications/block-trade-proposals/{block_trade_proposal_id}/accept`
- Auth: API key in header `KALSHI-ACCESS-KEY` and API key in header `KALSHI-ACCESS-SIGNATURE` and API key in header `KALSHI-ACCESS-TIMESTAMP`

Endpoint for accepting a block trade proposal.

## Path parameters

- `block_trade_proposal_id` string, required

## Request body

- AcceptBlockTradeProposalRequest
  - `subtrader_id` string: Subtrader ID to accept as. Provide either this or subaccount, not both.
  - `subaccount` integer: User-managed subaccount number to accept as (0 for primary, 1-63 for numbered subaccounts). Provide either this or subtrader_id, not both.

## Response `204`

Block trade proposal accepted successfully

## Other responses

- `400`: Bad request - invalid input
- `401`: Unauthorized - authentication required
- `404`: Resource not found
- `500`: Internal server error

## Changes

- **2026-07-31** `a07481be8bf9`: 4 warning
  - removed the optional property `service` from the response with the `400` status
  - removed the optional property `service` from the response with the `401` status
  - removed the optional property `service` from the response with the `404` status
  - removed the optional property `service` from the response with the `500` status
- **2026-06-17** `5dacc8874900`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/kalshi/apis/kalshi-trade-api-manual-endpoints/changes/communications/block-trade-proposals/:block_trade_proposal_id/accept/post.md)

---

[API](https://skmtc.dev/kalshi/apis/kalshi-trade-api-manual-endpoints.md) - [All operations](https://skmtc.dev/kalshi/apis/kalshi-trade-api-manual-endpoints/llms.txt) - [OpenAPI document](https://skmtc.dev/kalshi/apis/kalshi-trade-api-manual-endpoints/revisions/e6691cdd1915?raw)