Bankless Onchain

Queries ERC20 token balances for specified addresses and retrieves token metadata (name, symbol, decimals, total supply) by integrating with blockchain RPC endpoints. Implements standardized ERC20 ABI calls to read contract state without requiring transaction execution, enabling fast metadata lookups and balance checks across multiple chains.

Fetches historical transactions for a given address from blockchain explorers or RPC providers, supporting filtering by token, date range, transaction type, and status. Implements pagination and result caching to handle large transaction histories efficiently without overwhelming RPC endpoints or explorer APIs.

Reads arbitrary smart contract state variables and decodes function outputs using contract ABIs, enabling inspection of contract storage without executing transactions. Supports both standard ABIs and custom contract interfaces, with automatic type conversion for complex data structures like arrays, mappings, and structs.

Resolves Ethereum Name Service (ENS) names to addresses and vice versa, with support for cross-chain address lookups and normalization. Handles address validation, checksum verification, and chain-specific address formats (e.g., Solana addresses) to ensure consistent address handling across different blockchain ecosystems.

Estimates current gas prices (base fee, priority fee) from blockchain state and calculates total transaction costs based on gas limit and current network conditions. Integrates with EIP-1559 fee markets to provide dynamic fee recommendations that balance transaction speed and cost.

Tracks ERC20 token transfers and approval events by parsing transaction logs and decoding Transfer/Approval events from contract ABIs. Enables filtering by token, sender, recipient, or amount to build comprehensive transfer histories and detect approval patterns.

Analyzes wallet transaction history and on-chain behavior to generate activity summaries and risk scores, identifying patterns like frequent trading, large transfers, contract interactions, and approval grants. Uses heuristics and statistical analysis to flag suspicious activity or high-risk behaviors.

Provides specialized tools for querying protocol-specific data like Uniswap pool reserves and swap rates, Aave lending rates and collateral factors, or other DeFi protocol state. Implements protocol-specific ABIs and data structures to abstract away protocol complexity and expose high-level queries.