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To add Bitcoin payments with the Breez SDK, choose a supported SDK binding, request an API key, install and initialize the current Spark SDK, then build receiving and sending flows around its documented methods. For a send, prepare the payment first, show the returned fee information to the user, and only then submit it. Treat SDK events and errors as inputs to your app’s payment-status display, and make clear when a displayed fee is an estimate rather than a confirmed quote.
This guide follows Breez’s current Spark documentation. Bindings, API details, and access requirements can change, so use the current guide and the documentation for the exact SDK version you integrate. Historical Breez SDK variants may have different setup instructions and APIs; do not assume examples for those variants apply to Spark.
What the Breez SDK adds to an app
Breez describes its SDK as software for integrating Bitcoin and stablecoin transfers into an app or service. The current Spark repository describes a nodeless integration with supported send and receive methods. Breez also describes the SDK as free and open source; that is the vendor’s product description, not an independent assessment of performance, reliability, or operating costs.
The SDK is an integration component, not a ready-made payment screen. Your app still needs to request and initialize the SDK, present payment choices, collect or generate payment details, show fees, display progress and outcomes, and decide how those states fit into your account and support workflows. The SDK’s current documentation is the authority for method names, parameter formats, event types, and version-specific behavior.
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Check the binding and access requirements first
Choose a binding for the app you are building
Breez’s product page lists Swift, Kotlin, JavaScript, React Native, Flutter, Go, Python, C#, and WASM. The current Spark getting-started guide also lists Rust and Kotlin Multiplatform. These lists are not a promise that every binding is available or supported in every SDK release. Confirm that the binding you need appears in the current guide and is compatible with the specific version you plan to ship.
For a native iOS or Android app, start with the corresponding native binding if it suits your architecture. For a cross-platform app, verify the current React Native or Flutter instructions rather than assuming that a native example transfers directly. For browser-based work, distinguish a binding or SDK intended for your production architecture from Breez’s browser demo: the getting-started documentation explicitly says, “The web demo is for demonstration purposes only and not intended for production use.” A demo can help illustrate a flow, but it is not a production integration shortcut.
Request an API key
The Spark getting-started guide says an API key is required and describes requesting one from Breez. Check the current official instructions for the request process and any applicable access requirements before planning a release. Do not assume a key used for one SDK variant, environment, or application automatically applies to another.
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Plan how your app will provide the key to the SDK without embedding it in public source code or exposing it in logs. The precise key-handling mechanism should follow the current SDK instructions and your application’s security architecture; the documentation summarized here does not establish a specific storage mechanism, rotation policy, or separate development and production key scheme.
Plan the integration in a safe sequence
- Confirm the SDK branch and version. Use the current Spark documentation and the matching binding instructions. Do not copy setup code from historical Greenlight or older Liquid/Nodeless material without verifying that it applies to Spark.
- Request access. Obtain the required API key using Breez’s current getting-started instructions, and determine how your app will provide it to the SDK securely.
- Install the binding. Follow the package and platform instructions for the exact language or framework and version you selected. The available facts do not specify package names, version numbers, or installation commands, so take those directly from the current guide rather than adapting a guessed command.
- Exercise the documented development or testing path. The getting-started guide includes testing and development as part of onboarding. Follow its current directions for the environment you are using; do not interpret a browser demo as production-ready.
- Initialize the SDK. Implement the current initialization flow with the required configuration and API key. Use the version-matched API reference for parameter names and required values.
- Connect events and logging. Add the event-listening and logging steps covered by the guide. Feed documented events and errors into your app’s state handling; do not invent event names or infer that an event alone proves a payment has reached a particular finality state.
- Build receiving flows. Select the documented receive method that fits the payer’s payment method and your app’s use case. Include the on-chain address flow if you need to accept an on-chain Bitcoin payment.
- Build sending flows. Implement preparation and fee presentation before the send action. Provide separate input and confirmation paths for the payment methods your app chooses to support.
- Test the complete user experience against the current docs. Validate your app’s handling of preparation results, fee review, user cancellation, errors, SDK events, and refreshed status using the supported development and testing path. Treat the API reference as authoritative for what each result means.
This sequence follows the subjects the official onboarding outline covers: installation, testing and development, initialization, customization, SDK information, event listening, and logging. The exact API surface can change, so a tutorial that hard-codes method signatures without identifying a specific SDK version can become misleading quickly.
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Design payment state around SDK responses and events
A payment screen should distinguish the user’s intent from the state the SDK has actually reported. For example, selecting a recipient or preparing a payment is not the same thing as sending it, and tapping a send button is not by itself evidence that the payment completed. Represent those stages in your own app state and update them using the current SDK’s documented results, events, and errors.
Breez’s getting-started guide includes listening for events and adding logging. Implement those parts rather than relying only on the immediate result of a button action. The reviewed documentation summary does not provide event names, payload schemas, ordering guarantees, or persistence behavior, so do not build business logic around assumed names or a presumed event sequence. Verify those details in the reference for your selected SDK version.
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- Display success only when the SDK’s documented response or event supports that conclusion.
- Present failures with enough context for the user to decide whether to correct an input, retry, or stop. Avoid exposing sensitive diagnostic data in user-facing messages.
- Use logging to diagnose integration behavior, but avoid placing API keys, private user information, or payment credentials in logs.
- Make retry behavior explicit. A retry after an uncertain result should be based on the SDK’s documented state and recovery behavior, not a blind repeat of a payment request.
These are application-design recommendations, not claims about a particular event name or SDK guarantee. Confirm which states the SDK exposes and how they should be interpreted before translating them into labels such as “sent,” “paid,” or “failed.”
Implement sending as prepare, review, and send
The current send guide describes a two-step process: prepare the payment, then send it. Preparation validates request details and returns fee information for the user to review. Keep those steps separate in the interface. A user should have an opportunity to see the relevant fee details before the app asks the SDK to proceed with the payment.
- Collect the payment request. Accept the destination and any required amount in the format appropriate to the selected payment method. Validate obvious input issues in the app, but rely on the SDK’s preparation step for the validation it documents.
- Prepare the payment. Call the version-specific preparation operation with the request details. Read its result rather than calculating or substituting a fee in the interface.
- Explain the fee result. Display the fee information returned for that request. If the result indicates an estimate, label it as an estimate and explain that the final quote may be obtained later in the flow.
- Ask the user to confirm. Make the destination, amount, and fee status visible before submission. Let the user cancel without sending if the displayed information is unacceptable.
- Send only after confirmation. Pass the prepared payment through the documented send operation and update the screen from the resulting SDK response, events, and errors.
- Handle an unsuccessful result deliberately. Show an understandable outcome and follow the current SDK documentation for recovery. Do not claim a payment succeeded simply because preparation succeeded.
The documentation’s distinction matters operationally: preparation is where request validation and fee information are returned, while sending is the subsequent action. Combining them into an invisible one-tap operation removes the opportunity to review a fee and makes it harder for users to understand what they are authorizing.
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Which destinations can a send flow support?
The current send guide documents four destination types. Their requirements differ, so present the fields and fee explanation appropriate to the method selected instead of treating every destination as an interchangeable address.
| Destination type | What the current guide establishes | Implementation consideration |
|---|---|---|
| Lightning invoice (BOLT11) | An invoice can optionally take an amount if the invoice itself has no amount. If the invoice specifies an amount, a different amount is not supported. | Read whether the invoice includes an amount before offering an amount entry field. Do not imply that the user can override an invoice-specified amount. |
| Bitcoin address | An amount must be specified. Preparation returns slow, medium, and fast fee quotes. | Show the requested amount and the returned fee options. If a quote is marked as an estimate, label it accordingly and do not present it as final. |
| Spark address | Listed as a supported send destination in the current send guide. | Follow the current reference for the required request details, validation, and fee behavior; those specifics are not established here. |
| Spark invoice | Listed as a supported send destination in the current send guide. | Follow the current reference for amount handling, preparation results, and any method-specific UI; do not assume BOLT11 rules apply. |
The table describes what the current guide establishes, not every parameter or edge case for each method. The exact behavior should be verified against the API reference for the installed version before shipping a flow.
Present fee choices without overstating them
For a Bitcoin-address payment, preparation returns slow, medium, and fast fee quotes. Show the available choices in a way that makes their trade-off understandable, but do not invent a delivery-time guarantee: the documented information here establishes the quote categories, not a specific confirmation time for each one.
When conversion is needed and the user has a zero Bitcoin balance, the guide says the displayed fee can initially be an estimate. The SDK fetches a real quote after conversion. If the final quote exceeds the estimate, the operation fails rather than spending more than the estimate. This means an estimate is an upper bound in the documented scenario, not a confirmed fee. Preserve that distinction in the UI and respond clearly if the flow cannot continue at the final quote.
Explain route-dependent fees accurately
The send guide says preparation may include a Spark transfer fee when a Spark route is available, and that only one fee is paid according to the selected payment route. Do not add the displayed fee components together as though every listed fee is necessarily charged. Present the fee information the SDK returns for the chosen route, and avoid promising that a particular route will always be selected unless the current API documentation says so for your configuration.
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Build receive flows around the payer’s method
The current receive guide documents multiple receiving methods, including generating a Bitcoin deposit address for on-chain payments. Choose the methods your app needs and make the selected method obvious to the person paying. A payer who is sending on-chain Bitcoin needs an on-chain deposit address; a method intended for another payment path should not be represented as interchangeable with it.
- Choose the receive method. Use the current receive guide to select a method supported by the app’s binding and the payer’s intended payment path.
- Generate the payment details. For an on-chain payment, the documented flow includes generating a Bitcoin deposit address. Use the SDK’s current API rather than constructing or modifying a payment destination yourself.
- Show the details in a usable form. Make the address or other generated payment details easy to copy or scan as appropriate to the method, and label the payment type so the payer understands what to use.
- Show status using documented feedback. Connect the receive screen to the SDK’s documented event and state behavior. Do not claim that creating or displaying a deposit address means funds have arrived.
- Handle errors and stale screens. If the SDK reports an error or the user leaves the screen, follow the current reference for the relevant state and recovery behavior. Do not invent address reuse, expiration, or persistence rules.
The receive guide contains details beyond the on-chain address flow, but the available documentation summary does not identify each other method or its parameters. Consult that guide for the supported methods and use only those appropriate to the binding and version you ship.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Understand stable-balance conversion and estimates
The stable-balance guide describes an option for configuring conversion when there is not enough Bitcoin to pay. In that situation, stable-balance settings can affect payment preparation. The relevant user-facing point is that a send may involve more than the Bitcoin balance and a single fee figure: conversion options and on-chain fees can change what the app needs to show.
For a Bitcoin-address payment with a zero Bitcoin balance, the documented flow can initially display an estimated fee based on current on-chain rates. A real quote is fetched after conversion; the estimate is an upper bound, and payment fails rather than exceeding it. Keep the estimate label attached to the number anywhere the user sees it, including confirmation screens or summaries. Once the SDK returns a real quote, display that result according to the current API’s meaning.
- Do not turn an estimated quote into a fixed-price promise.
- Do not hide the estimate status when the user moves from preparation to confirmation.
- Do not add a made-up conversion fee or exchange rate; show only the amounts and fee information the SDK documents and returns.
- If the SDK cannot proceed because the final quote exceeds the estimate, explain that the payment did not proceed and let the user make a fresh decision using the updated information.
These details are documented for the described stable-balance and Bitcoin-address scenario. Do not assume the same estimate behavior applies to every destination type or every balance condition.
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What to verify before release
SDK integrations depend on version-specific behavior. Use a release checklist that checks both the API implementation and the payment screen a customer will actually see.
- Version and binding: Confirm the current Spark branch, package or binding, supported platform, and version-specific examples.
- Access: Confirm the current API-key requirement and how your application supplies the key.
- Initialization: Verify the exact required configuration and initialization result against the current guide.
- Events and errors: Confirm event names, payloads, ordering expectations, and error meanings in the version-matched reference before mapping them to app states.
- Send preparation: Confirm which fields are required for each destination, what preparation validates, and how the result expresses fees and estimates.
- Confirmation: Check that the destination, amount, applicable fee information, and estimate status remain visible before the send action.
- Receive methods: Verify the method-specific generation and status behavior, including on-chain deposit-address handling where relevant.
- Stable balance: Confirm the supported configuration and the exact behavior for the payment method and balance state you intend to support.
- Logging and support: Ensure logs help diagnose SDK issues without disclosing secrets or unnecessary personal information.
- Development versus production: Use documented development and testing instructions, and do not deploy Breez’s web demo as though it were a production integration.
What the available documentation does not establish
The official materials described here are useful implementation references, but they do not provide independent benchmark comparisons for speed, uptime, fees versus competitors, or SDK reliability. They also do not establish a universal custody model, persistence guarantee, or exact event lifecycle for every binding. Treat those as questions to resolve in the current technical documentation and in your own architecture review, not as assumptions to carry over from a different product or SDK generation.
Breez’s product page has reported that more than 100 teams have integrated the SDK. That is a vendor-reported adoption figure; the page does not state a year for the figure, so it should not be treated as an independently verified or dated market statistic. Adoption alone does not answer whether a particular binding, payment method, or operational model fits your app.
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Practical integration decision
The Breez SDK Spark path is a reasonable candidate to evaluate when your app needs the send and receive methods documented for the binding you plan to use, and you are prepared to build the application-side UI, status handling, logging, and fee-confirmation experience. Its most important integration constraint for payment UX is straightforward: prepare first, communicate the actual fee result—including whether it is an estimate—and send only after the user has had a chance to review it.
Before committing to a platform or implementation plan, confirm the current binding, API-key process, exact SDK version, and method-specific API behavior in Breez’s live documentation. The documentation evolves, and the current Spark flow should not be conflated with older Breez SDK variants.
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