How to use expand API for retrieving and writing transactions?

Whether a seasoned blockchain developer or just starting a coding adventure, users will definitely need an API for retrieving and writing transactions. That’s where expand API comes into the scene. With the expand API users can unlock the full potential of blockchain and interact with various blockchains like Ethereum, Binance Smart Chain, and more. This feels like having an exclusive backstage pass to the world of decentralized applications and transactions! So, let's explore how to harness the power of expand API.

Understanding How to Use API

With API users can retrieve transactions using expand API by following a few simple steps. Let’s retrieve and write transactions step by step.


First things first, register on the’s platform and user will receive an API key that acts as the golden ticket to accessing blockchain data.

Harness the API key and formulate the HTTP requests, specifying the blockchain the user is interested in. supports a wide range of networks - Ethereum, BSC, Polygon, Solana, and many more.

How to Use API to Query


To query, the user needs to send the required data in the query parameter which can include the sender’s public address, token address, etc.


Once the user sends the request, API will send the data according to the request; like block details, transaction details, and much more.

How to Use API to Transact


To transact, the user needs to send the required data in the body parameter which can include the sender’s public address, token address, token amounts etc. Once user send this request, they will receive the prepared transaction.


Once the user has the prepared transaction, the user needs to sign it using their private key. This can be done using the SDK; through which the user can sign the transaction on their local device.


Once the user signs the transaction, they can send their transaction to the blockchain, using’s endpoint.


After sending the transaction, it enters the network's mempool and awaits confirmation. provides API to monitor the transaction's status and receive notifications when it's confirmed.

Whether building a decentralized finance (DeFi) application, a non-fungible token (NFT) marketplace, or a supply chain solution, expand API allows one to retrieve and write transactions on the blockchain. Also with SDK developers can harness the power of multiple blockchains. Start the journey into blockchain with trusted API.