Spiral Grants

Grants from Block's Spiral for independent developers, designers and researchers working on open-source Bitcoin or open-source AI.

Apply on official site

Time left to apply

UTC

ANY

RollingNo deadline

Applications are reviewed as they arrive. There is no deadline to plan around.

Grant size: Size not published; No published ceiling
Paid in: Not published; Paid in one go
Funding model: Rolling; Apply any time. Reviewed as applications arrive.
Typical decision: 6 weeks; From submission to an answer

Checked Oct 1 against 6 sources. Confirm amounts and dates on spiral.xyz before you apply.

About the program

Spiral is Block's open-source group, founded in 2019 to give back to the Bitcoin community. Besides building projects such as LDK, it runs a grant program for independent developers, designers, product managers and researchers. Past grantees include the BDK Foundation, Payjoin's Dan Gould, BTC Map and the Bitcoin Design Foundation.

In July 2026 Spiral rebranded around open-source Bitcoin and AI after the core developers of goose, Block's open-source AI agent, joined it. Spiral says the goose grant program will become part of its broader grant program, so proposals for open-source AI work are now in scope alongside Bitcoin.

There is no form or deadline. You email a detailed proposal to grants@spiral.xyz. Spiral does not publish grant sizes, review criteria or timelines, but its updates show that many grants are renewed and that grantees join a Signal group of past and current grantees.

What they fund

Open-source Bitcoin software, such as wallets, libraries and Lightning
Bitcoin privacy tools, such as Payjoin and CoinSwap
Bitcoin design and usability
Open-source AI, including goose and its developer kit
Bitcoin and AI together, such as payments between AI agents

Who can apply

Check yourself0 of 4

Independent developers, designers, product managers and researchers
Projects and individual contributors; grantees so far span more than a dozen countries
Work should improve open-source Bitcoin or open-source AI
A detailed proposal sent by email; no other requirements are published

Tick what applies to you. Saved on this device only.

How applying works

Write a proposal
Describe the open-source Bitcoin or AI work you want to do, in detail.
Email Spiral
Send the proposal to grants@spiral.xyz; there is no form or deadline.
Spiral review
The Spiral team reviews proposals; it publishes no criteria or timeline.
Join the crew
Grantees join the Spiral Extended Crew, a Signal group for past and present grantees, and grants can be renewed.

Sources

Checked on Oct 1 against these pages. Programs change often, so confirm the details on spiral.xyz before you apply.

About the program

What they fund

Who can apply

How applying works

Write a proposal

Email Spiral

Spiral review

Join the crew

Sources

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