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Developer builds open-source Rust-based instant payment framework inspired by Brazil's Pix

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A developer has launched raio, an open-source instant-payment foundation written in Rust, modeled after Brazil's Pix system, which has enabled 24/7 real-time transfers since 2020. The project aims to provide a reusable, interoperable base layer for building payment rails in any market, rather than serving a single bank or country. Raio-core is designed to be entirely IO-free, making it deterministic and easy to fuzz-test, with all network and storage concerns abstracted behind traits. The framework includes strict currency handling to prevent silent mismatches and ships two QR payment codecs supporting both Brazil's BR Code and the widely used EMVCo standard. The developer is seeking open-source contributors to help expand the project further.

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