Get Mempool Transaction Hashes: API Migration (v3 to v4)

This guide covers the migration from legacy v3 chain-specific Get mempool transaction hashes endpoints to the new unified Blockchains API endpoint Get mempool transaction hashes

Endpoint Change Summary

Component	v3 (Legacy)	v4 (New)
Standard Pattern	`/v3/{chain}/mempool`	`/v4/data/blockchains/mempool`

Deprecated v3 Endpoints

The following chain-specific endpoints have been consolidated:

Old v3 Endpoint	Status
`/v3/bitcoin/mempool`	Deprecated
`/v3/dogecoin/mempool`	Deprecated
`/v3/litecoin/mempool`	Deprecated

Migration Steps

1. Update Your Base URL

Standard endpoints:

- GET /v3/bitcoin/mempool
+ GET /v4/data/blockchains/mempool?chain=bitcoin-mainnet

2. Adjust Chain Identifiers

Ensure you're using the new chain identifier format (e.g., ethereum-mainnet instead of ethereum).

3. Update Response Handling

Review your code for any response schema changes between v3 and v4.

🚧
Attention
Mind potential breaking changes.