Best Practices for Securely Using API Keys

Published on: 11.02.2023

API stands for “Application Programming Interface”. It is a set of protocols, routines, and tools on how software components should interact, allowing for communication between different systems and applications. In simple terms, an API acts as an intermediary that allows one software application to access and make use of the features or data of another application.

API is widely used in the cryptocurrency industry to allow developers to access data and interact with cryptocurrency exchanges, wallets, and other financial services. API also can be used to access data stored on the blockchain, such as the history of transactions for a specific address or the current state of a smart contract.

Aside from the API, there is also something known as an API key. API defines the rules for how two systems should communicate and exchange data, while the API key provides authentication and authorization for access to the resources associated with the API.

What is an API key and How Does It Work?

An API key is a unique string of characters that is passed in by a computer program to identify the calling program and provide access to the resources associated with an API.

When a developer wants to use an API, they first request an API key from the API provider. The API provider then generates a unique API key for the developer and provides it to the developer. The developer includes the API key in the requests made to the API.

When a request is made to the API, the API key is included in the request header. The API then checks the API key to determine if it is valid. If the API key is valid, the API returns the requested resources to the calling application. If the API key is invalid or has been revoked, the API will reject the request and return an error message.

Why and When to Use API Keys?

There are several reasons and scenarios why and when API keys are used:

  1. Security: API keys provide an added layer of security for an API by ensuring that only authorized users or applications have access to the resources and services provided by the API.
  2. Access control: API keys can be used to restrict access to an API to specific users or applications, and to limit the number of requests that can be made to the API.
  3. Metrics and analytics: API keys can be used to track usage of an API, such as the number of requests made, the types of requests made, and the users or applications making the requests.
  4. Billing: API keys can be used to charge for access to an API based on usage, such as the number of requests made or the amount of data used.

It’s important to note that API keys should be kept secret, as they provide access to sensitive resources and data. API keys should not be included in client-side code or shared publicly, as they can be easily exploited if they fall into the wrong hands.

What are API Keys Risks?

One major risk is that API keys can be easily leaked or stolen if they are included in publicly accessible files. This can give unauthorized access to sensitive data and resources, and can potentially result in malicious actors using the API for malicious purposes.

Another risk is that API keys can be misused if they are not properly secured or rotated. For example, if a user with malicious intent gains access to an API key, they can potentially use it to execute actions on behalf of the associated account.

To ensure the security of API keys, it is important to follow best practices for securely storing and using them. 

Best Practices to Securely Store and Using API Keys

Storing and using API keys is an important consideration to ensure the protection of sensitive information and resources. Here are some best practices for securely storing and using API keys:

  1. Encryption: Encrypt the API keys before storing them, and ensure that the encryption keys are stored securely and separately from the encrypted data.
  2. Server-side storage: Store the API keys on a secure server, rather than in client-side code. This makes it more difficult for an attacker to access the keys.
  3. Access controls: Implement access controls to limit who has access to the API keys, and use a secure authentication mechanism such as multi-factor authentication to prevent unauthorized access.
  4. Regular audits: Regularly review and audit your API key storage system to ensure that it remains secure and that no unauthorized access has occurred.
  5. Use of secrets management tools: Consider using secrets management tools, such as AWS Secrets Manager or Hashicorp Vault, which are specifically designed to securely store secrets like API keys.
  6. Rotate keys regularly: Regularly rotate API keys to reduce the risk of a compromised key being used to access sensitive resources.
  7. Limit key permissions: Assign the minimum permissions required for an API key to function, and restrict the IP addresses that can use the key.
  8. Monitor usage: Monitor the usage of API keys, and be alert for signs of abuse or unauthorized access.


Finally, it is important to monitor the use of API keys and to be alert to any suspicious activity, such as unusual usage patterns or unauthorized access attempts. This can help to quickly detect and mitigate potential security incidents.

Overall, securely storing API keys requires a multi-layered approach that involves implementing proper access controls, using encryption, monitoring usage, and being proactive about security.

Market Stats:
BTC Dominance: 52.53%(-0.22%/24h)
ETH Dominance: 17.91%(-0.10%/24h)
Defi Market Cap: $104.32B(+3.36%/24h)
Total Market Cap: $2557.23B(-2.03%/24h)
Total Trading Volume 24h: $97.33B(+22.40%/24h)
ETH Market Cap: $458.52B
Defi to ETH Ratio: 22.75%
Defi Dominance: 3.86%
Altcoin Market Cap: $1213.98B
Altcoin Volume 24h: $64.37B
Total Cryptocurrencies: 29928
Active Cryptocurrencies: 10067
Active Market Pairs: 83326
Active Exchanges: 772
Total Exchanges: 8609
BTC: 68134.46$(0.41%/1H)
ETH: 3808.75$(-0.62%/1H)
AVAX: 36.9$(-0.4%/1H)
BNB: 599.44$(-0.01%/1H)
MATIC: 0.73$(-0.24%/1H)
FTM: 0.82$(-0.11%/1H)
ADA: 0.46$(-0.33%/1H)
DOT: 7.38$(-0.18%/1H)
UNI: 11.04$(-0.47%/1H)
CAKE: 2.95$(-0.2%/1H)
SUSHI: 1.24$(0.22%/1H)
ONE: 0.02$(0.02%/1H)