Open Source Alternatives to Square (now Block)

Shopify provides a leading e-commerce platform that enables businesses of all sizes to create online stores, manage products, process payments, and fulfill orders, simplifying digital sales globally.

Open source

Aemetis is a renewable fuels and biochemicals company focused on low-carbon solutions like RNG and SAF.

Open source · Self-hostable

Real-time finance infrastructure for Web3, enabling per-second value transfer and automated continuous payments.

Open source · Self-hostable

Building the infrastructure for the onchain internet with smart wallets and cross-chain payments.

Open source

Plaid provides a data transfer network powering fintech and digital finance products.

Open source

A leading payment gateway and financial services platform for businesses in India.

Open source

Commerce enablement technology powering billions of transactions for businesses globally.

Open source

Self-custodial key management and white-label wallets for platforms integrating Web3.

Open source

Fintech protocol for universal liquidity, fixing DeFi interoperability by uniting fragmented blockchains and assets.

Open source

AI-driven ledger management solutions for financial technology operations.

Open source

Secure payment solution for AI agents using virtual credit cards and stablecoins.

Open source

eToro is a social investing platform enabling users to trade stocks, crypto, and ETFs, and copy top-performing investors.

Open source

Global fintech-as-a-service platform enabling businesses to accept, send, and manage funds worldwide.

Open source

Online cross-border financial services platform for international workers and migrants.

Open source

Unified platform for managing digital wealth with crypto wallets, debit cards, and banking services.

Open source

High-performance blockchain powering decentralized applications and crypto projects.

Open source

A decentralized protocol for lending and borrowing cryptocurrencies.

Open source

Online payment gateway and financial services provider for businesses in Turkey and emerging markets.

Open source

BitPay is a cryptocurrency payment service provider facilitating transactions for businesses and individuals.

Open source

An open banking payment platform enabling real-time account-to-account payments globally.

Open source

Global payment infrastructure provider enabling businesses to accept and make payments worldwide.

Open source

Mobile-first blockchain platform.

Open source

A payment infrastructure company enabling account-to-account payments.

Open source

Open-source lending protocol for superior capital efficiency in Decentralized Finance (DeFi).

Open source · Self-hostable

Atom is a mobile-first digital bank offering personal and business banking services in the UK.

Open source

A high-performance Layer 1 blockchain network connecting payment systems for efficient, compliant global asset transfers.

Open source

The Compliance OS for Onchain Finance.

Open source

A permissionless, non-custodial lending protocol for decentralized finance, enabling risk-adjusted yield generation.

Open source

ROX Financial provides a platform for small businesses to manage and grow their revenue through flexible financing options.

Open source

Lava Payments is a fintech startup providing a payment orchestration platform for businesses to manage and optimize their payment flows.

Open source

AI-powered platform for financial services.

Open source

Decentralized synthetic dollar protocol providing a censorship-resistant, scalable, and capital-efficient alternative to traditional stablecoins.

Open source

A financial infrastructure platform offering payment processing, banking-as-a-service, and business tools for internet companies.

Open source

Decentralized exchange protocol and liquidity layer for DeFi, enhancing capital efficiency.

Open source

An advanced DeFi management platform for collateralized debt positions and yield optimization.

Open source

Decentralized payment infrastructure and marketplace for AI agents to transact and monetize services.

Open source

A decentralized payment network and stablecoin project launched by Meta (formerly Facebook), aiming to provide a more inclusive global payment system.

Open source

Innovative fintech solutions platform launching soon. Subscribe for updates.

Open source

An open, neutral standard for internet-native payments, enabling programmatic payments directly within HTTP requests.

Open source

Velocitypay offers a payment processing platform for businesses, focusing on seamless integration and efficient transactions.

Open source

Online payment gateway for businesses in Paraguay, offering QR, Tigo Money, and Personal Pay integrations.

Open source

Develops blockchain scaling solutions using STARK technology for Ethereum-secure, fast, and seamless user experiences.

Open source

Stripe, Inc. is an Irish-American multinational financial services and software as a service company dual-headquartered in South San Francisco, California, Unit

Open source

Subscription management and recurring billing platform for SaaS and e-commerce businesses.

Open source

Financial infrastructure platform enabling businesses to accept payments and manage global operations.

Open source

Business banking.

Open source

Web3 infrastructure company building the Sui Layer 1 blockchain for high throughput and low-cost transactions.

Open source

High-performance blockchain for decentralized exchanges.

Open source

Building a high-performance, scalable blockchain with a novel execution environment.

Open source

Buy Now, Pay Later service enabling interest-free installment payments for consumers.

Open source

Interoperability solutions for tokenized assets, enabling secure and regulated digital securities trading.

Open source · Self-hostable

All-in-one revenue engine for AI agents, handling pricing, subscriptions, billing, and renewals.

Open source

A decentralized autonomous organization managing the Dai stablecoin and the Maker Protocol on Ethereum.

Open source

A secure, scalable, and sustainable proof-of-stake blockchain platform for decentralized applications and smart contracts.

Open source · Self-hostable

Blockchain fintech provider for sports and entertainment, powering the Socios.com fan engagement platform.

Open source

Modular interoperability protocol for building crosschain applications and deploying crosschain-native tokens.

Open source

End-to-end cybersecurity solutions for the Web3 ecosystem.

Open source

A leading crypto finance house providing a global exchange, wallet, and institutional services.

Open source

Self-custody Bitcoin security and financial services for institutions.

Open source

A non-custodial mobile platform for the P2P Lightning economy, enabling Bitcoin payments.

Open source