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

# Cancel Block Trade Proposal

`DELETE /communications/block-trade-proposals/{block_trade_proposal_id}`

## 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}`
- Auth: API key in header `KALSHI-ACCESS-KEY` and API key in header `KALSHI-ACCESS-SIGNATURE` and API key in header `KALSHI-ACCESS-TIMESTAMP`
- TypeScript: <https://skmtc.dev/kalshi/apis/kalshi-trade-api-manual-endpoints/docs/communications/block-trade-proposals/:block_trade_proposal_id/delete.ts> (a function with typed inputs; its response is checked against the schema)

Endpoint for cancelling a pending block trade proposal. Only the proposer can cancel it.

## Path parameters

- `block_trade_proposal_id` string, required

## Response `204`

Block trade proposal cancelled successfully

## Other responses

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

## Changes

> 79 revisions in range; 1 not diffed.

- **2026-11-05** `3dfc9a41c6f7`: 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/delete.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/8aa55efce4f9?raw)