Blockchain Events

Blockchain Events

Subscribe for a certain event, that could happen on any Blockchain, and we will notify your verified endpoint with all details when the event occurs. Event types can include a new block, new transaction, new token transfer, new internal transaction, and more. The delay between event time and sending our callback is less than 100 ms.

Blockchain Events


  • Top Blockchain Protocols have different data structures. Integrating them requires the allocation of development resources separately for everyone.
  • The nodes of different blockchain protocols are huge. In addition to the needed time for syncing there is a huge monthly hosting bill.
  • Being able to process every single block and fetch data for your transactions when you have millions of addresses to monitor is a huge technical challenge.


  • Pay only when there is a demand, no need to host nodes and pay for servers when you can get a callback notification when a certain event happens.
  • There is no need to queue nodes or check constantly balances when you can sit and wait for a callback notification every time the event you would like to monitor occurs. This saves all a lot of resources and saves you huge costs and headaches.
  • We monitor hundreds of millions of addresses and our callback delay is less than 100 ms. There is no need to reinvent the wheel.
  • Wesley Wen

    Wesley Wen

    Technical Director


    Choosing Crypto APIs has helped us to not only accelerate the progress of developing new features for our CoolWallet product but also while providing great stability. Their services are valuable to us and their products are offered at a fair price.

  • Angus Goldman

    Angus Goldman

    Co-founder & CTO


    The Crypto APIs team helped us with our development and scaling challenges by utilizing their Blockchain products. Unlike previous providers, we advantaged from their seamless integration providing us blockchain data, transaction notifications, accurate exchange rates, and more by using just one SDK and all with just one subscription from the same provider.

  • Xavier Hendrickx

    Xavier Hendrickx

    Co-founder & CTO


    After trying multiple different platforms, we were impressed by Crypto API's quality support and robust uptime. Crypto API is now our number one choice for blockchain gateway.

  • Narek Gevorgyan

    Narek Gevorgyan



    Crypto APIs have been a great help for us to enable accessing hardware wallet data of our customers, which significantly increased our value proposition. Their support and willingness to help their customer is amazing. Highly recommended if you're looking for any kind of crypto API.

  • Jenny Hsu

    Jenny Hsu

    Market Director


    If you want to integrate cryptocurrency with your service or product, we recommend using Crypto APIs. Accessing the hardware wallet data of our customers, which definitely advanced our products' development, was a great help from Crypto APIs. Crypto APIs provides good services that help us accelerate the development of new features.

  • Sharan Nair

    Sharan Nair



    Crypto APIs has an outstanding team that helped us successfully integrate their Blockchain products. We can now take advantage of the best crypto API available and our business has been scaling faster than before. Crypto APIs is without a doubt a leading company in their field that provides its products at a fair price.

  • Rod Hsu

    Rod Hsu



    Businesses like ours can easily get frustrated when the search for a third-party provider proves fruitless. Crypto APIs were like a breath of fresh air - they have the best support team I have ever seen, provide a great variety of products to get access to blockchain and market data, set up notifications, and more, all with an easy integration that doesn’t take more than a day.

  • Obasi Francis Ifegwu

    Obasi Francis Ifegwu

    Founder and CEO

    Lead Wallet

    By using Crypto APIs we overcame a vicious cycle where we constantly had issues with hosting, support, and nodes, where we constantly paid other providers to use better features but that never happened. Now we use the functionality we actually need without compromising our security and saved a lot of costs. I Highly recommend Crypto APIs!

  • Christian Jombo

    Christian Jombo



    We were facing issues with huge developments and uncomfortably high infrastructure costs, which at the time seemed like they would never end. Making the decision to switch our provider to Crypto APIs has been one of the best business moves I’ve made in my career. Now we get blockchain data, transaction notifications, accurate exchange rates, and more by using just one SDK and one subscription from the same service provider.

  • Michael Benisti

    Michael Benisti

    Head of Data


    Crypto APIs Blockchain Data is a reliable and fast provider. By using their APIs we can now easily and in a matter of milliseconds access any Blockchain data from top Blockchain protocols.

  • Trayan Nikolov

    Trayan Nikolov

    Chief Product and Operating Officer


    We were very pleased when we discovered Crypto APIs. Now we have a trusted provider whose products proved to be reliable, effective and fast. Our business runs smoother with the help of Crypto APIs and our customers are extremely happy.

  • Raymond Idu

    Raymond Idu



    Crypto APIs do a really good job! It's really great how quick and effective their APIs are. With their help, we have accelerated and improved our development and scaling processes. Their support was excellent and really helpful to our growth.


  • Unified Requests

    One of the biggest benefits here is that we provide 100% unified requests, which means no matter of the blockchain or network, you can always use EXACTLY the same request to create a subscription. You have to integrate it only once no matter of the supported blockchain protocol number.

  • Unified Callbacks

    The Callback structure depends on the event time. Still, no matter of the blockchain and network you will always receive exactly the same callback structure for the same event type.

  • Multiple Events Types

    You can create subscriptions for different events such as: new block, new confirmed transaction, new unconfirmed transaction, new tokens transfer, new internal transaction, changes in fees, a transaction with an amount higher than another certain amount, etc.

  • Secured Callbacks using Signature

    You can add "callbackSecretKey" to your request which will indicate to our team that you want us to add a signature to our callbacks. It's a much needed feature to ensure your application that the callback really comes from Crypto APIs 2.0, and not from somewhere else. We use "HMAC_SHA256" to create a signature, which is set in our post header as "X-Signature".

  • Verified Domains & Retry Logic

    We don't allow users to create a subscription before they verify their domain. Once approved, you can then use it in the callbackURL parameter. However, in case we post our request to the callbackURL and you don't accept it properly (there is no 200 status code as a response), we will try to resend it again up to 5 times.

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Why customers choose Crypto APIs

Build at the fraction of time using our Open API 3.0 specifications and multiprogramming language SDKs.

With Crypto APIs you can integrate in hours, go to market in days and save from your development and large infrastructure bills.

Save from your development and large monthly bills by using Crypto APIs instead of running your own infrastructure, all without compromising security.

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