Implementation of API Key requirements starting from February 15th, 2020 onwards.

Implementation of API Key requirements starting from February 15th, 2020 onwards.

The Etherscan Developer APIs are designed to provide the Ethereum community with accessible and consistent Ethereum data. The APIs are provided as a community service with a maximum rate limit of up to 5 calls per sec/IP.

As the APIs provided are open and unrestricted, developers can easily utilize them together with a free API key token (generated from the client portal). The API key acts as both a unique identifier and a secret token for authentication, and generally specify a set of access that is specific to the identity associated with it. The API key also allows developers to monitor and to prevent malicious use, abuse and attacks on our end.

While our usage instructions and documentation have long advocated the required use of an API key for all requests (as per, this was not enforced for more than a year to allow developers time to make the necessary changes.

Starting from February 15th, 2020 all developers are required to use a valid API key to access the API services provided by Etherscan. If you are already using a valid API key together will your call request, then you are good to go. However, if you have not please register for a free API key at our website. Failure to register and use an API will result in the return of an error stating “Invalid API Key.”

To register for an API key, developers must first register for an Etherscan account. If you do not have an etherscan account, you can sign up using instruction detailed in our knowledgebase. A single Etherscan account allows the creation of 3 API key.

On the Etherscan user dashboard, you can select “API-KEYs” from the left-hand side column.

A pop up as below will appear when you click on “Create a new API-KEY token”. You can assign a name to the particular API key you intended to create.

An API key is successfully created will be shown as below:

You can now utilize the newly created API key for your applications.

If you face any issue creating an API key or using our API, kindly reach out to Etherscan Support

Published at Wed, 15 Jan 2020 03:14:38 +0000


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