---
title: "Get mempool transaction hashes"
method: GET
path: "/v4/data/blockchains/mempool"
tags: ["Blockchains API"]
---

# Get mempool transaction hashes

`GET /v4/data/blockchains/mempool`

/v4/data/blockchains/mempool

**20 credits per API call**

Get mempool (unconfirmed) transaction hashes for a UTXO chain. Supported chains: Bitcoin, Litecoin, Dogecoin, BCH (mainnet and testnet). Response is an array of transaction hashes (strings).

## Query parameters

- `chain` 'bitcoin-mainnet' | 'bitcoin-testnet' | 'litecoin-mainnet' | 'litecoin-testnet' | 'doge-mainnet' | 'dogecoin-testnet' | 'bch-mainnet' | 'bch-testnet', required

## Response `200`

OK

- string[] — Mempool transaction hashes.

## Other responses

- `400` — Bad Request
- `401` — Unauthorized. Not valid or inactive subscription key present in the HTTP Header.
- `403` — Forbidden. The request is authenticated, but it is not possible to perform the operation due to logical error or invalid permissions.
- `500` — Internal server error. There was an error on the server during the processing of the request.

---

[API](https://skmtc.net/tatum/apis/blockchain-data.md) · [All operations](https://skmtc.net/tatum/apis/blockchain-data/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/tatum/blockchain-data/revisions/8622ee4b8fae/schema)