Blockchain start-up Halliday lands $20m Series A led by Andreessen Horowitz
Halliday, a US-based start-up assisting financial developers in building blockchain applications without smart contracts, has raised $20 million in a Series A funding round led by Andreessen Horowitz (a16z crypto).

Halliday raises $20m Series A funding
The round was supported by SV Angel, Credibly Neutral, and the Avalanche Blizzard Fund. Angels including Coinbase’s Viktor Bunin, Celestia’s Ekram Ahmed, Story Protocol’s Jason Zhao, and Nikil Viswanathan and Joe Lau from Alchemy also participated.
Halliday has now raised over $26 million in total funding following its $6 million seed round in 2022, which was also led by a16z crypto.
With the funds, the company says it plans to “accelerate the development of our Workflow Protocol”. This protocol has been designed to offer a unified programming model enabling developers to automate workflows and simplify blockchain processes.
Halliday claims its technology eliminates the need for developers to write and maintain complex smart contracts, reducing development time from months to hours. The company adds that its Workflow Protocol will enable safer AI integration into blockchain applications by enforcing strict, on-chain guardrails.
The start-up also intends to use the funds from its Series A to expedite the development of its first-party product, Halliday Payments.
Currently used by over 35 clients, Halliday Payments acts as an end-to-end payments suite enabling transactions across layer 1, layer 2, and layer 3 networks. Built on Halliday’s Workflow Protocol, it allows businesses to integrate digital asset payments, stablecoin subscriptions, and treasury management without writing smart contracts.