fednow

A Python package (on PYPI) to create or parse ISO20022 messages.

Open-source middleware connecting legacy core banking systems to U.S. instant payment rails — FedNow and RTP.

The FedNow ISO 20022 specifications

A comprehensive, high-performance, open-source Rust library for parsing, generating, validating, and transforming ISO 20022 (MX) financial messages.

FRB Services Status Checker

Correct, idempotent, concurrency-safe double-entry ledger with ISO 20022 payment processing (pain.001 → pacs.008 → pacs.002) and a reconciliation engine. Proves exactly-once under duplicate/concurrent payments.

An open-source, high-performance payment message processing runtime built on top of the mx20022 message library. This is the transaction processing engine — the layer that turns a parsing library into a payment platform.

Open, machine-readable dataset of payment-rail capabilities (limits, cut-offs, settlement, identifiers) across UK/EU/US/CA, with typed accessors. Every fact is sourced and dated.

Nivelo is a New York City fintech that operates a payments risk and money-movement platform for the payroll industry, serving payment service providers (PSPs) and professional employer organizations (PEOs).

Cross River is a regulated bank (FDIC member, Fort Lee, NJ) that delivers embedded finance and Banking-as-a-Service (BaaS) through its Cross River Operating System (COS) - a collection of REST APIs for deposit accounts, ACH, wires, instant payments (RTP, FedNow, CRNow), card issuing and processing, lending, and KYC/customer onboarding.

Dwolla is a Des Moines-based fintech providing an account-to-account (A2A) payments platform that lets businesses programmatically move money across the U.S. banking system. Its v2 REST API — a JSON-HAL hypermedia API secured with OAuth 2.0 client-credentials — supports ACH (standard and Same-Day), instant/real-time payments over the RTP Network…

Narmi is a digital banking platform for community banks and credit unions in the United States. The Narmi One platform unifies consumer and business digital banking, omnichannel account opening (Narmi Grow), instant payments over FedNow (Narmi Now), fraud prevention (Narmi Guard), lending (Narmi Lend), a digital back-office (Narmi Command), an…

Cross River Bank is an FDIC-insured chartered bank that operates as a sponsor bank and banking-as-a-service (BaaS) provider for fintech companies, embedded-finance platforms, and crypto / stablecoin issuers.