Brian

Brian is a Web3 AI intent engine that converts plain-English instructions into ready-to-sign blockchain transactions. Users type what they want to do — "swap 10 USDC for ETH" or "send 2 SOL to wallet.sol" — and Brian interprets the intent, selects the correct protocol and route, and returns a pre-built, unsigned transaction that the user can review and sign in their connected wallet. Brian never holds assets or executes transactions on the user's behalf.

Origins

Brian was built at ETHPrague in June 2023 as a hackathon project and won five first-place prizes across different tracks at the event. It launched publicly after the hackathon, growing its supported network and chain coverage as the product matured.

How It Works

Brian interprets user intent through a fine-tuned AI model called Brian-8B, based on Llama 3.1 8B trained specifically on Web3 transactions, protocol documentation, and DeFi interaction patterns. This fine-tuned model understands Web3-specific vocabulary, token symbols, and protocol names more reliably than general-purpose LLMs, which tend to hallucinate protocol details.

When a user submits a plain-English instruction:

1. Brian-8B parses the intent and identifies the appropriate protocol or action.
2. Brian's backend queries the relevant protocol APIs to construct the transaction calldata.
3. The frontend returns an unsigned transaction object to the user's wallet (MetaMask, Phantom, Backpack, etc.).
4. The user reviews and signs — nothing is sent to any blockchain until the user explicitly approves.

Brian does not require custody of private keys or wallet seed phrases. It functions as a transaction builder, not an executor.

Solana Support

Solana support was added in December 2024 via Jupiter aggregator integration. Brian supports Solana token swaps, SOL and SPL token transfers, and balance queries on Solana. Jupiter handles the routing layer for Solana swaps, selecting the best liquidity path across Solana DEXs.

Multi-Chain Coverage

Brian supports 14 EVM chains (including Ethereum, Base, Arbitrum, Optimism, and others), Solana, and Starknet. Users can switch context between chains in the same conversation. Chain selection is automatic when the intent is unambiguous (the user mentions a chain-specific token or protocol) and prompted when the intent could apply to multiple chains.

Pricing

Brian uses a freemium model. The free tier provides limited monthly API calls. Paid tiers begin at $99 per month, targeting developers who want to integrate Brian's intent engine into their own applications. An API is available for developers building AI-powered DeFi interfaces that use Brian as the transaction-building backend.

Security

Brian's design is non-custodial by construction. The transaction builder returns pre-built transaction objects to the user's wallet for signing; Brian's servers do not hold signing keys. No public third-party security audit of Brian's backend infrastructure or smart contract interactions has been disclosed in available sources.

Solana Ecosystem Fit

Brian's Solana integration via Jupiter makes it a natural onboarding tool for users who prefer conversational interaction over navigating DEX interfaces. Its primary appeal is for users who know what they want to do with crypto but are unfamiliar with which protocol to use or how to configure swap parameters. Within the Solana ecosystem, Brian addresses the same usability gap that abstract wallet interfaces and DeFi dashboards try to solve, but through an AI-native conversational layer rather than a visual interface redesign.