Who it is for
- Individual developers or organisations with the technical capacity to build SDK tooling
- Must not be subject to US sanctions
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Open Payments SDK
Funding the developer tools that make Open Payments easier to build with Applications from April 1st - reviewed on ongoing basis
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Open Payments is Only as Usable as its Tooling
Software development kits (SDKs) reduce the time and effort required to integrate an API like Open Payments into an app. However, creating bespoke SDKs in many programming languages requires broad expertise and duplicative maintenance effort. Tools exist to automate the creation and maintenance of SDKs, but do not yet support the latest security features used by Open Payments.
The Interledger Foundation seeks to improve the developer experience of Open Payments by funding proposals under a number of themes.
At a Glance
What it supports
Development of the OP API, including:
- SDK tooling
- Security scheme support
- HTTP Message Signatures libraries
- Arazzo Specification documentation
How it works
- Rolling review from April 1, 2026.
- Proposals should define a work scope with a 3–12 month timeline
- Budget proportional to the maximum amounts stated below.
- Open until budget is fully awarded.
Themes and Funding
- Support for RFC 9635 Grant Negotiation and Authorization Protocol (GNAP) as a security scheme in the OpenAPI Specification (up to $25,000)
- Support for GNAP in the Kiota SDK generator for TypeScript, PHP, Python, and Go (up to $10,000 per language)
- Support for Rust and Ruby languages in the Kiota SDK generator (up to $25,000 per language)
- Software libraries for RFC 9421 HTTP Message Signatures (up to $5,000 per language)
- Documenting Open Payments flows in Arazzo Specification (up to $1,000)
- Support for Arazzo Specification in the Kiota SDK generator (up to $25,000)
- Support for RFC 9635 in curl (up to $10,000)
About Open Payments
Open Payments is a universal HTTP API for initiating and authorizing a payment on any payment network. Any financial service provider can implement the Open Payments API to enable its customers to use Open Payments. Websites and apps then integrate Open Payments as API clients to facilitate payments on behalf of their customers.
Open Payments SDK FAQ
Who is eligible to apply?
Any individual or organization not subject to US sanctions.
TODO: link to https://ofac.treasury.gov/sanctions-programs-and-country-information
What is the timeline for this program?
Proposals will be evaluated on an ongoing basis. The call for proposals will remain open until the grant program budget has been fully awarded.
How do I budget my proposal?
Proposals should define a work scope with a plausible, 3–12 month timeline and proportional budget in line with the maximum quantities stated above.
Where can I get more information?
Ask in GitHub Discussions or in the #cfp-sdk channel in our community Slack workspace
TODO: link https://github.com/interledger/Grants/discussions
https://communityinviter.com/apps/interledger/interledger-working-groups-slack
TODO Heading
Before applying, check the Grantmaking FAQs to know our approach and expectations. For additional clarifications, reach out to the program team.