Who it is for
- Individual developers or organizations with the technical capacity to build SDK tooling
- Must not be subject to US sanctions
Open Payments SDK
Funding the developer tools that make Open Payments easier to build with
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.
In 2026, the Interledger Foundation sought 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
- Grant cycle is now closed for 2026.
Themes and Funding in 2026
- Support for RFC 9635 Grant Negotiation and Authorization Protocol (GNAP) as a security scheme in the OpenAPI Specification.
- Support for GNAP in the Kiota SDK generator.
- Support for the Ruby languages in the Kiota SDK generator.
- Support for Arazzo Specification in the Kiota SDK generator.
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.
Our Approach to Grantmaking
Check out our Grantmaking FAQs to know our approach and expectations across all our grants. For additional clarification, reach out to programteam@interledger.org.