<p>There are several API services that allow bulk address queries.</p>
<p>For example smartbit's API takes up to 1,000 addresses with their <code>v1/blockchain/addresses</code> endpoint which will return details about each address sorting by the highest balance first.</p>
<p>Example GET request:<br />
<a href="https://api.smartbit.com.au/v1/blockchain/addresses/1DuMuchPBGNoi5b9JmpreZ2L5EpuMiJdyc,1N75aWck3TFPorTvSgdzLUttY8uddqTAFZ,161UqtBktXJMzcg2zxBGMiHgnVrtH78Amx,19eK34996XoXPgpranrUVSPLmkxzowt8ox" rel="nofollow noreferrer">https://api.smartbit.com.au/v1/blockchain/addresses/1DuMuchPBGNoi5b9JmpreZ2L5EpuMiJdyc,1N75aWck3TFPorTvSgdzLUttY8uddqTAFZ,161UqtBktXJMzcg2zxBGMiHgnVrtH78Amx,19eK34996XoXPgpranrUVSPLmkxzowt8ox</a></p>
<p>Link to API docs: <a href="https://www.smartbit.com.au/api" rel="nofollow noreferrer">https://www.smartbit.com.au/api</a></p>
<p>EDIT: Smartbit API is permanently offline</p>
<p>EDIT 2: Blockcypher offers a similar API service.</p>
<p><a href="https://www.blockcypher.com/dev/bitcoin/#address-balance-endpoint" rel="nofollow noreferrer">https://www.blockcypher.com/dev/bitcoin/#address-balance-endpoint</a></p>

CC BY-SA 4.0
2021-06-20T22:40:06.353Z
I think you mean `.../address/<addr1>,<addr2>` since `.../addresses/` just returns the richest people no matter any parameters.
Luc
CC BY-SA 4.0
2018-06-09T14:57:15.827Z
2021-09-24T13:44:22.503Z
2021-09-24T13:44:22.503Z
m1xolyd1an
<p>You have two options :</p>

<ol>
<li>Request on one of block explorer platforms which will let you query on blockchain on their server. Check : <a href="https://blockexplorer.com/api-ref" rel="nofollow noreferrer">https://blockexplorer.com/api-ref</a></li>
</ol>

<p>Example request :</p>

<pre><code>$ curl https://blockexplorer.com/api/addr/19SokJG7fgk8iTjemJ2obfMj14FM16nqzj
{"addrStr":"19SokJG7fgk8iTjemJ2obfMj14FM16nqzj","balance":0,"balanceSat":0,"totalReceived":112.91089695,"totalReceivedSat":11291089695,"totalSent":112.91089695,"totalSentSat":11291089695,"unconfirmedBalance":0,"unconfirmedBalanceSat":0,"unconfirmedTxApperances":0,"txApperances":364,"transactions":["a2afb522edeba67ae593c683154da45b231d59ffccd18806cec38ecd21994a2d","28ccc7fe617451a4d15b8cea64a6ac222600e2877073ba543d83225a354975ac","950239654cd47d2b53f98bdf250cfbf516e1a9eaf87944ee8afac603a9cb61fc","4daa82997cb86b6f75089ad19eddf518b77a4d88a72920efbab6439914a2183b","27b6dc933a9eee548d5b40574c16e9e29a907e9a85a51c2545a60a0833a0f441","cacc6ded99959ff8310b18e1052e05a4aa9fe8c4c7f9651318fbbe3fcd5a16ab",...}
</code></pre>

<ol start="2">
<li>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. <a href="http://chainquery.com/bitcoin-api/listtransactions" rel="nofollow noreferrer">http://chainquery.com/bitcoin-api/listtransactions</a></li>
</ol>

<p>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.</p>

CC BY-SA 4.0
2018-06-09T12:34:26.457Z
1: are block explorers free to use?

2. Can you point me to one that meets my needs?
Romano Streel
CC BY-SA 4.0
2018-06-09T14:54:30.590Z
yes. mosty such services charge you when you want to make transaction. i've updated my answer.
Kerem atam
CC BY-SA 4.0
2018-06-09T11:51:32.820Z
2018-06-09T14:52:50.013Z
2018-06-09T14:52:50.013Z
Kerem atam
<p>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?</p>

<transactions><address><api>
Simple Address check via API
Romano Streel
# Simple Address check via API

(Asked by: username_0 on 2018-06-09)

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?

**Tags:** transactions, address, api


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## 2 answers

### Answer by username_1 on 2018-06-09. Score: 3

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:  
<https://api.smartbit.com.au/v1/blockchain/addresses/1DuMuchPBGNoi5b9JmpreZ2L5EpuMiJdyc,1N75aWck3TFPorTvSgdzLUttY8uddqTAFZ,161UqtBktXJMzcg2zxBGMiHgnVrtH78Amx,19eK34996XoXPgpranrUVSPLmkxzowt8ox>

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

EDIT: Smartbit API is permanently offline

EDIT 2: Blockcypher offers a similar API service.

<https://www.blockcypher.com/dev/bitcoin/#address-balance-endpoint>

> **Comments:**
> **username_2**: I think you mean `.../address/<addr1>,<addr2>` since `.../addresses/` just returns the richest people no matter any parameters.  

---

### Answer by username_3 on 2018-06-09. Score: 0

You have two options :

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
{"addrStr":"19SokJG7fgk8iTjemJ2obfMj14FM16nqzj","balance":0,"balanceSat":0,"totalReceived":112.91089695,"totalReceivedSat":11291089695,"totalSent":112.91089695,"totalSentSat":11291089695,"unconfirmedBalance":0,"unconfirmedBalanceSat":0,"unconfirmedTxApperances":0,"txApperances":364,"transactions":["a2afb522edeba67ae593c683154da45b231d59ffccd18806cec38ecd21994a2d","28ccc7fe617451a4d15b8cea64a6ac222600e2877073ba543d83225a354975ac","950239654cd47d2b53f98bdf250cfbf516e1a9eaf87944ee8afac603a9cb61fc","4daa82997cb86b6f75089ad19eddf518b77a4d88a72920efbab6439914a2183b","27b6dc933a9eee548d5b40574c16e9e29a907e9a85a51c2545a60a0833a0f441","cacc6ded99959ff8310b18e1052e05a4aa9fe8c4c7f9651318fbbe3fcd5a16ab",...}


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.

> **Comments:**
> **username_0**: 1: are block explorers free to use?  2. Can you point me to one that meets my needs?  
> **username_3**: yes. mosty such services charge you when you want to make transaction. i've updated my answer.  

---

