# Blend

> Blend is a fixed-unit token basket protocol deployed on Robinhood Chain. Each ERC-20 basket share is backed by specified quantities of its active constituent assets.

Use this file to locate authoritative Blend documentation and contract interfaces. Use llms-full.txt when the complete protocol and integration reference is required.

## Documentation

- [Developer documentation](https://blend.theindex.finance/docs): Protocol architecture, accounting, transactions, fees, failure recovery, contracts, and indexing.
- [Complete LLM context](https://blend.theindex.finance/llms-full.txt): Full text reference intended for model context windows.
- [ABI manifest](https://blend.theindex.finance/abis): Network metadata, deployed addresses, vault discovery, and ABI URLs.

## Contract ABIs

- [BasketFactory ABI](https://blend.theindex.finance/abis/basket-factory.json): Machine-readable contract interface.
- [BasketVault ABI](https://blend.theindex.finance/abis/basket-vault.json): Machine-readable contract interface.
- [BlendHook ABI](https://blend.theindex.finance/abis/blend-hook.json): Machine-readable contract interface.
- [BlendRouter ABI](https://blend.theindex.finance/abis/blend-router.json): Machine-readable contract interface.
- [BlendLens ABI](https://blend.theindex.finance/abis/blend-lens.json): Machine-readable contract interface.

## Network

- Chain: Robinhood Chain mainnet
- Chain ID: 4663
- Factory start block: 55989258
- Explorer: https://robinhoodchain.blockscout.com
- Public RPC: https://rpc.mainnet.chain.robinhood.com

## Important fee distinction

Basket-owner fees and Blend protocol fees are separate onchain charges. The basket owner's fee accrues to that basket's treasury, which holders can receive through accretion until the owner withdraws it. The Blend protocol fee accrues to a separate bucket that anyone may sweep, in full and in kind, to Blend's fixed protocolFeeRecipient(); accretion inside the vault never spends this bucket.