Halliday is a San Francisco blockchain infrastructure company building the Agentic Workflow Protocol, a system that lets developers create onchain financial applications without writing smart contracts. Its flagship product, Halliday Payments, gives developers a single interface for fiat onramps, cross-chain bridging, swaps, and offramps. Backed by a16z crypto across both its seed and Series A rounds, Halliday has raised $26 million total and works with teams including DeFi Kingdoms, Avalanche, ApeCoin, Story Protocol, and Metis.

Griffin Dunaif is the co-founder and CEO of Halliday, a San Francisco blockchain startup building the first agentic workflow protocol - infrastructure that lets developers ship onchain applications without writing smart contracts. A Stanford computer science graduate (2023) who left to build, Dunaif started Halliday in 2022 as a buy-now-pay-later tool for gamers, then pivoted to the broader bet that workflows, not contracts, are how AI agents will safely operate onchain. The company has raised $26 million total, including a $20 million Series A led by a16z crypto in March 2025.