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BTC 
ETH Function launches the FBTC Agent SDK to reshape Bitcoin's role in DeFi
Function, a Bitcoin focused DeFi infrastructure entity, has released the FBTC Agent software development kit. The toolkit aims to transform Bitcoin into programmable capital, marking that Function is moving beyond cross-chain liquidity and encapsulated assets. According to Function's official press release, the toolkit allows AI agents to read positions, prepare transfers and evaluate the market environment. In this way, the SDK allows Bitcoin liquidity to flow into different lending markets while maintaining user control over final execution.
Bitcoin is becoming programmable capital. Function launches the FBTC Agent SDK-provides developers with native tools to bring FBTC to the DeFi ecosystem on Ethereum and Mantle networks. The toolkit is built for developers using the Vercel AI SDK, custom proxy loops, or Coinbase AgentKit.
FBTC Agent SDK launches, revolutionizing Bitcoin's role in DeFi
Function launches the FBTC Agent SDK, marking a key development in redefining Bitcoin as an active asset that can be used in the DeFi network and accessible by agents. In addition, the SDK provides agent-native tools that allow developers to seamlessly integrate with entities such as the Vercel AI SDK, custom proxy loops, and Coinbase AgentKit.
In addition, it also disclosed FBTC metadata, FBTC transfer flows, and details of the lending market on Aave V3 (Mantle and Ethereum). Developers can now build workflows that allow AI agents to query balances, prepare loan transfers, and check reserves, while ensuring deterministic verification and execution. This approach meets the growing market demand for proprietary, programmable BTCFi tools that combine user-controlled security and automation.
At the same time, Function officially released two packages with specific execution boundaries. Among them, the "@functionfbtc/sdk-agent" package has nothing to do with the framework and focuses on conservative transfer preparation and generates transfer parameters for user review, thereby ensuring that the agent will never directly submit or sign the transfer. The "@functionfbtc/sdk-agentkit" package extends the Coinbase AgentKit to register Aave V3 and FBTC operations; this version also performs authorization and provisioning through a configured wallet and returns transfer receipts to improve transparency.
Transform Bitcoin into programmable capital
According to Function, the SDK supports Aave V3-based FBTC borrowing positions on Mantle and Ethereum. As a result, agents can seamlessly observe health factors, query balances, and manage withdrawal, supply, repayment, and borrowing operations, including stablecoins such as USDe, USDT, and USDC. It is worth noting that the SDK implements network prompts to ensure that Mantle and Ethereum contexts remain recognizable.
Overall, this release highlights a broader market trend: Bitcoin is no longer just digital gold, and is transforming into programmable capital that can be integrated into the next generation DeFi stack.
