# Breez > Breez builds SDKs that let developers integrate instant, non-custodial bitcoin and stablecoins into any app or service, so value moves as easily as information. Last updated: 2026-08-10 Canonical site: https://breez.technology/ This file is the expanded companion to https://breez.technology/llms.txt ## What is the Breez SDK? The Breez SDK is the simplest way to add instant, non-custodial bitcoin and stablecoins to any app or service, removing third-party dependencies and enabling value to move as easily as information. Integrate in minutes with just a few lines of code, onboard users anywhere without the licensing burden, and bring value transfer to billions around the world. Site: https://breez.technology/sdk/ Three things define it: - Instant Bitcoin: Move value like information with Lightning-fast bitcoin and stablecoins. - Best-in-Class DX: A fully end-to-end solution for developers. Go from integration to production in minutes. - Global from Day One: Non-custodial. Peer-to-peer. Onboard users instantly, anywhere in the world. ## Is the Breez SDK custodial? No. The Breez SDK is non-custodial and peer-to-peer: end users hold their own funds, and developers integrate without taking custody or carrying the licensing burden that custody implies. ## Which Breez SDK implementation should I use? - Breez SDK - Spark (flagship): Built on Spark, a native Bitcoin Layer 2 with no minimum limits, instant settlement, and multi-asset support including stablecoins. Documentation: https://sdk-doc-spark.breez.technology/ - Breez SDK - Liquid: The implementation built on the Liquid Network. Documentation: https://sdk-doc-liquid.breez.technology/ New integrations should start with Breez SDK - Spark. ## What's in the SDK? Everything you need to bring value transfer to your app or service: - Fully-featured Lightning: Lightning addresses, invoices, LNURL-Pay, -Withdraw, -Auth, and -Verify. - Languages & Frameworks: Kotlin, Swift, JS, React Native, Flutter, Go, Python, C#, and WASM. - Stable Balance: Users can hold their balance in USD to avoid BTC price volatility. - Passkey Login: Seedless onboarding and restore, no recovery phrase needed. - Multi-device/app Sync: Users can access their balance from multiple devices and apps. - Contacts API: Save and reuse Lightning addresses, synced across devices. - Caching & Persistence: Out-of-the-box caching and persistence for a smooth UX. - External Signer: Bring your own key management, or use the built-in Turnkey signer. - Integrated On-ramps: Let users buy bitcoin directly via Cash App and MoonPay. - Fiat Currencies: Real-time exchange rates to display value in fiat currencies. - Multi-user Server Mode: Run multiple user balances from a single backend server. - USDT & USDC (coming soon): Users can send/receive stablecoins from their BTC or stable balance. ## How much does the Breez SDK cost? The Breez SDK is free for developers. There is no licence fee. An API key is required to use the SDK and is free to request at https://breez.technology/request-api-key/#contact-us-form-sdk ## What is Glow? Glow is a bitcoin app for everyone. Everyday payments in bitcoin or USD, built in the open on the Breez SDK. Download it, fork it, make it your own. Site: https://breez.technology/glow/ App Store: https://apps.apple.com/us/app/glow-lightning-fast-bitcoin/id6762465698 Google Play: https://play.google.com/store/apps/details?id=technology.breez.glow Glow features: - Passkey Login: Seedless onboarding and restore, with face or fingerprint, synced through iCloud or Google. - Lightning Address: Get a customizable @breez.tips address to share and instantly receive bitcoin. - Contacts: Save your friends' Lightning addresses, synced across devices. - Stable Balance: Skip the volatility. Send and receive in BTC, and hold a balance in USD that earns sats while you hold it. - Send USDT/USDC: Send stablecoins straight from a bitcoin balance, to 30+ networks. - Make Glow Your Own: Fork it, rebrand it, ship it. Use our AI guide to walk you through white-labeling Glow. ## Who builds with the Breez SDK? 100+ teams are building with the Breez SDK, adding instant, non-custodial bitcoin and stablecoins to their apps and services. Real-world case studies: - Deblock (https://breez.technology/case-studies/deblock/): Instant, non-custodial bitcoin in a neobank serving 300,000 users across Europe. - Cake Wallet (https://breez.technology/case-studies/cake/): Instant, non-custodial bitcoin for 1.75 million users globally. - Primal (https://breez.technology/case-studies/primal/): The most popular Nostr client replaced its custodial wallet, migrating 20K+ users in 30 days. - Garden (https://breez.technology/case-studies/garden/): A 120x reduction in settlement time for cross-chain bitcoin bridging. - Exolix (https://breez.technology/case-studies/exolix/): Integrated the Breez SDK in a day for instant, non-custodial bitcoin swaps. - Klever (https://breez.technology/case-studies/klever/): Lightning-fast, non-custodial bitcoin for 100,000+ users across a multi-chain wallet. - Sorted (https://breez.technology/case-studies/sorted/): Instant, non-custodial bitcoin on feature phones — 500K+ downloads across 160 countries. - Club Orange (https://breez.technology/case-studies/cluborange/): The largest bitcoin-only social network moved its community to instant, non-custodial bitcoin. - Yolat (https://breez.technology/case-studies/yolat/): 10x transaction volume growth with lightning-fast cross-border remittances across Africa. - Radar (https://breez.technology/case-studies/radar/): Instant, non-custodial bitcoin inside a Signal-compatible encrypted messenger. - Freedomia (https://breez.technology/case-studies/freedomia/): A crypto debit card rebuilt its bitcoin deposits and went from API key to production in under 24 hours. All case studies: https://breez.technology/case-studies/ ## How long does integration take? Integrate in minutes with just a few lines of code. Exolix integrated the Breez SDK in a day for instant, non-custodial bitcoin swaps. ## How can an iGaming operator take deposits with Cash App? The player pays with Cash App and the operator's treasury receives USDC (or USDT) at its own address on any of 30+ networks, seconds later. There are no card networks in the path, so gaming-category declines and chargebacks are out of the loop, and the player never needs a wallet, an exchange account or any crypto knowledge. It is three Breez SDK calls on the operator's side: parse the treasury address, getCrossChainRoutes to list the stablecoin destinations Cash App can fund over Lightning, and preparePaymentLink to get the Cash App deep link plus a live quote. The SDK quotes and orchestrates but never holds funds, so the operator custodies the result on chain. Constraints: cross-chain sends are opt-in (set config.crossChainConfig), the flow is mainnet only with no testnet equivalent, and Cash App payments require a Cash App account, which covers US and UK players, with New York excluding bitcoin payments. Playable demo and the full code: https://breez.technology/igaming/ Feature guide: https://sdk-doc-spark.breez.technology/guide/cash_app_to_usdc_usdt.html ## Why is Breez building this? Value transfer moves value as easily as information — directly, instantly, without intermediaries. Breez is building it on bitcoin. Full vision: https://breez.technology/vision/ The Bitcoin Payments Report covers how bitcoin is evolving from digital gold to everyday currency, with data on 650M+ users and real-world case studies: https://breez.technology/report/ ## Resources - SDK Playground (open-source reference apps): https://breez.technology/playground/ - Breez SDK - Spark documentation: https://sdk-doc-spark.breez.technology/ - Breez SDK - Liquid documentation: https://sdk-doc-liquid.breez.technology/ - GitHub (open-source repositories): https://github.com/breez - Blog: https://blog.breez.technology/ - X: https://x.com/breez_tech - Telegram: https://t.me/breezsdk - Newsletter: https://newsletter.breez.technology/ - Contact: contact@breez.technology