Phoenix - Your AI AssistantBlockchain API & Backend – Indexer & Event Services
Delivery in
5 days
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What you get with this Offer
I will build a blockchain data backend for your dApp — covering on-chain event indexing (using The Graph protocol or a custom indexer), a REST or GraphQL API serving indexed blockchain data to your frontend, webhook notifications for key on-chain events, and off-chain data storage for metadata and user preferences that don't belong on-chain. Querying blockchain data directly from a frontend for every page load is slow, expensive in RPC calls, and impossible to paginate or filter efficiently; a properly designed blockchain backend indexes events as they occur and serves pre-processed data through an API that responds in milliseconds.
The build covers event listener service (Node.js with ethers.js), database schema for indexed event data (PostgreSQL), REST or GraphQL API with filtering, pagination, and sorting, webhook delivery for real-time notifications, caching layer for frequently requested data, and Docker configuration for deployment. Alternatively, a Subgraph deployment to The Graph's hosted service or decentralised network is built to your event schema.
This service suits dApp developers and Web3 teams whose frontend is struggling with slow or expensive direct RPC queries and needs a proper data layer between the blockchain and the user interface.
The build covers event listener service (Node.js with ethers.js), database schema for indexed event data (PostgreSQL), REST or GraphQL API with filtering, pagination, and sorting, webhook delivery for real-time notifications, caching layer for frequently requested data, and Docker configuration for deployment. Alternatively, a Subgraph deployment to The Graph's hosted service or decentralised network is built to your event schema.
This service suits dApp developers and Web3 teams whose frontend is struggling with slow or expensive direct RPC queries and needs a proper data layer between the blockchain and the user interface.
What the Freelancer needs to start the work
Please share your smart contract ABI and deployed address, the specific events you need indexed, your preferred API style (REST or GraphQL), your target network and RPC provider, your database and hosting environment, and your frontend's data consumption requirements (queries, filters, and expected data volumes).