---
title: "Legacy broadcast transaction using the request body."
method: POST
path: "/api/v1/sendtx/"
tags: ["Legacy"]
---

# Legacy broadcast transaction using the request body.

`POST /api/v1/sendtx/`

Bitcore Insight-compatible V1 broadcast route for Bitcoin-type coins.

Load estimate: High; validates and forwards to the backend, with cost
growing with transaction size and backend mempool policy checks.

## Response `200`

Broadcast result.

- SendTransactionResponse
  - `result` string, required — Broadcast transaction id/hash.

## Other responses

- `default` — Public API error. Public validation errors are HTTP 400; internal errors are HTTP 500.

## Changes

- **2026-05-25** `46ece0263a48` — 1 info
  - endpoint added
- **2026-05-25** `4fca91df0bb0` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/trezor/apis/blockbook-api/changes/api/v1/sendtx/post.md)

---

[API](https://skmtc.dev/trezor/apis/blockbook-api.md) · [All operations](https://skmtc.dev/trezor/apis/blockbook-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/trezor/blockbook-api/revisions/01c375da86bc/schema)