So I have a wallet with thousands of addresses, I want to know how can I check the blockchain whether or not a transaction has been made to one(or another) of the addresses?

2 Answers 2


There are several API services that allow bulk address queries.

For example smartbit's API takes up to 1,000 addresses with their v1/blockchain/addresses endpoint which will return details about each address sorting by the highest balance first.

Example GET request:

Link to API docs: https://www.smartbit.com.au/api

EDIT: Smartbit API is permanently offline

EDIT 2: Blockcypher offers a similar API service.


  • I think you mean .../address/<addr1>,<addr2> since .../addresses/ just returns the richest people no matter any parameters.
    – Luc
    Commented Jun 20, 2021 at 22:40

You have two options :

  1. Request on one of block explorer platforms which will let you query on blockchain on their server. Check : https://blockexplorer.com/api-ref

Example request :

$ curl https://blockexplorer.com/api/addr/19SokJG7fgk8iTjemJ2obfMj14FM16nqzj
  1. If you dont want to rely on any 3rd party services; install bitcoind (or similar bitcoin client), import your addresses in watch-only mode and query using provided RPC calls. http://chainquery.com/bitcoin-api/listtransactions

First option is simpler as you dont need to download GBytes of chain data. Second option is better as you dont rely on some platform.

  • 1: are block explorers free to use? 2. Can you point me to one that meets my needs? Commented Jun 9, 2018 at 12:34
  • yes. mosty such services charge you when you want to make transaction. i've updated my answer.
    – Kerem atam
    Commented Jun 9, 2018 at 14:54

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