> For the complete documentation index, see [llms.txt](https://docs.chainupcloud.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chainupcloud.com/resources/faq/blockchain-api.md). # Blockchain API ## :gear:General ### What is a Blockchain API? A Blockchain API provides easy access to Web3 networks, empowering developers to create decentralized applications and enhance efficiency using reliable infrastructure. ### Why should I use ChainUp Cloud's Blockchain API? Interfacing with a blockchain node is expensive and time consuming. Also, you need to pay extra attention to communicated with a trusted node. ChainUp Cloud's API is free, reliable and trustworthy. ### What blockchains are available on ChainUp Cloud? We now support Ethereum, Filecoin, Bitcoin, Litecoin, Polkadot, Polygon, Binance Smart Chain, Aptos, Sui, Starknet, Harmony, Fantom, Avalanche, Solana, Near, Tron and more. More chains coming soon. ### What is the difference between API and RPC endpoint? We call any programmable interface an API (Application Programming Interface). It is a general concept. For Web3 development, we have JSON RPC (Remote Procedure Calls) as the interface for the block chain calls. Almost all the APIs we provide are RPC endpoints. Just be consistent when you discuss the topic with others. ### What is an API key? An API Key is the credential to query all services. When you create an App in your dashboard, an API key will be generated with your ChainUp Cloud App. Please note, you should never share your API key to others to prevent others from using your account. ## :rocket:Onboarding ### How to create a ChainUp Cloud account? You can use any email account to sign up for ChainUp Cloud easily. With ChainUp Cloud account, you can get access to a variety of services such as Blockchain API, Validator Nodes and more. To do this, go to ## :moneybag:Pricing ### Is it free to use ChainUp Cloud's services? Yes. All users may use our free plan with no charges. ### What are the current Pricing Plans? You can start your testing with a free plan, which is suitable for individual developers. For small teams, we suggest developer plan, and you can choose team plan when your team grows. ### Do I need a credit card to start using the ChainUp Cloud's service? No, unlike other vendors, you do NOT need a credit card to sign up. Just login, that is it. ### Can I ask for additional Blockchain API usage? Yes. If you’re interested in higher levels of usage, please contact --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.chainupcloud.com/resources/faq/blockchain-api.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.