ChangeNOW API vs SwapSpace API: which crypto swap API is better for your business?

The swap API you choose has a direct impact on your product from day one. It affects which assets your users can exchange, where exchange rates come from, how much liquidity is available, and how easy it will be to scale over time.

If you're building a wallet, exchange, payment app, or another Web3 product, your swap API becomes part of the core user experience. The quality of the integration influences everything from asset coverage and available exchange routes to transaction reliability.

In this comparison, we'll look at the ChangeNOW API and SwapSpace API side by side, focusing on what developers usually care about during integration: liquidity, supported assets, documentation, flexibility, and the overall integration experience.

What is the ChangeNOW API?

The ChangeNOW API enables wallets, exchanges, payment platforms, and other Web3 applications to integrate cryptocurrency swaps without having to build exchange infrastructure from scratch. For faster deployment, ChangeNOW also offers a customizable exchange widget.

Key features include exchange quote generation, swap creation and tracking, affiliate tools, white-label integrations, and an embeddable widget for crypto swaps. White-label solutions can be deployed without ChangeNOW branding.

Alongside crypto-to-crypto swaps, ChangeNOW also supports fiat on-ramp and off-ramp integrations, allowing businesses to enable users to buy and sell cryptocurrency with traditional payment methods within the same ecosystem.

What is the SwapSpace API?

The SwapSpace API enables applications to integrate cryptocurrency swaps through a single connection to 45+ liquidity providers, including ChangeNOW. Instead of relying on one exchange infrastructure, it aggregates offers from multiple providers and returns the available exchange options through a single API.

Developers can retrieve exchange quotes, create and track swaps, access 3,600+ cryptocurrencies and 600,000+ trading pairs, and integrate a customizable swap widget. The API also exposes the provider network, allowing applications to retrieve the list of available partners or request quotes from specific providers when needed.

Fiat on-ramp functionality is available through supported partners. 

For products, the aggregation model reduces integration complexity while providing broader market coverage through a single integration.

ChangeNOW API vs SwapSpace API at a glance

At first glance, ChangeNOW API and SwapSpace API offer many of the same core features. Looking a little deeper, differences start to appear in the liquidity model, asset coverage, routing options, and the way each API is designed to scale. Here's how they compare.

Want to see how the API works? Browse the SwapSpace API documentation to explore the available endpoints, authentication flow, and integration examples before continuing with the comparison.



Liquidity aggregator vs single liquidity provider

Both APIs return exchange quotes. The key difference is how those quotes are generated and where the underlying liquidity comes from.

ChangeNOW API connects applications to ChangeNOW's own exchange infrastructure. From the integration side, everything happens through a single API, while exchange execution relies on the company's liquidity network and routing logic.

SwapSpace API also relies on a single integration, but it pulls exchange offers from a much larger network of providers. When an application requests a quote, the API compares available exchange routes across its partner network and returns multiple options through the same integration. 

Why developers choose a liquidity aggregator

The advantages of an aggregated liquidity model become more noticeable as your product grows. Supporting popular assets like Bitcoin, Ethereum, or USDT is rarely a problem for any major API. The real difference appears when users start swapping less common tokens, newly listed assets, or cryptocurrencies across different blockchain networks.

At the same time, relying on a single exchange infrastructure can have its own advantages. Because routing happens within one ecosystem, the exchange flow is generally more predictable and there are fewer variables for developers to consider.

With an aggregated API, you can:

• Cover more assets without adding new exchange integrations.
• Avoid relying on a single provider, giving your users more options if one provider has limited liquidity or doesn't support a particular swap.
• Scale more easily, since one integration gives you access to multiple liquidity sources instead of having to connect them one by one.

Integration experience

Beyond the available endpoints, developers also evaluate documentation quality, authentication, testing, support, and how predictable the API behaves in production.

Both ChangeNOW API and SwapSpace API offer:

• REST API architecture.
• Endpoints for requesting exchange quotes.
• Exchange creation and transaction status tracking.
• Documentation for integrating wallets, exchanges, payment platforms, and other Web3 applications.

The integration flow is similar on both platforms: 

1. 1. Developers request a quote, 
2. 2. Create an exchange, 
3. 3. Monitor its status until completion.

The main difference appears before the quote request. SwapSpace also provides endpoints for retrieving supported currencies and available exchange partners, allowing applications to:

• Display available providers before a swap is created.
• Filter offers by partner or rate type.
• Build richer exchange interfaces with more information for users.

ChangeNOW keeps the flow more streamlined by automatically handling provider selection behind the scenes, reducing the amount of routing logic developers need to implement.

Testing before production

ChangeNOW does not provide a dedicated sandbox environment. Their documentation suggests using small real transactions for testing and even mentions the XRP → XLM pair as a low-cost option. 

SwapSpace offers a separate dedicated Sandbox environment for test transactions.

Both APIs provide developer documentation, allowing teams to test and integrate the service before moving into production.

SwapSpace documentation recommends implementing endpoints in this order:

1. 1. Currencies
2. 2. Partners
3. 3. Estimated exchange amount
4. 4. Create exchange

SwapSpace authenticates through the standard Authorization header using an API key. 

ChangeNOW has both public and private API keys depending on functionality. The private key is only used for specific endpoints.

ChangeNOW offers a white-label mode that allows partners to keep the exchange experience under their own branding.

As with any third-party API, ongoing support matters after launch as well. Both platforms provide support for developers, though the level of assistance ultimately depends on the complexity of the integration.

Customization & developer control

Beyond the core swap functionality, both APIs provide options for adapting the integration to a product's own workflow.

ChangeNOW focuses on branding and integration with internal systems. Partners can use custom fields such as userId and payload to attach application-specific data to exchanges, making it easier to associate transactions with internal records. The API also supports white-label integrations, allowing businesses to offer swap functionality without displaying ChangeNOW branding.

SwapSpace exposes more controls over the exchange flow itself. Developers can request quotes from individual providers, retrieve only fixed-rate or floating-rate offers, configure an affiliate fee, and pass a customer ID for internal tracking. The API also returns partner-specific information, allowing applications to display or filter offers based on factors such as KYC requirements, estimated processing time, and liquidity source.

Overall, ChangeNOW focuses on branding flexibility and custom metadata, while SwapSpace provides more integration parameters for tailoring how exchange offers are selected and presented.

Quote generation & provider selection

Quote generation is one of the main architectural differences between the two APIs.

With ChangeNOW, the request returns an exchange estimate generated by ChangeNOW's infrastructure.

With SwapSpace, the same request can return multiple offers for the requested pair, each coming from a different exchange partner. These offers may differ in exchange rate, estimated processing time, rate type, or KYC requirements. Behind the scenes, SwapSpace aggregates liquidity from major CEXs (such as Bybit, KuCoin, and MEXC), DEX infrastructure (including Chainflip and NEAR Intents), and privacy-focused exchange providers, giving applications access to a broader range of exchange routes through a single API.

For products that automatically choose the best available option, or let users compare offers inside the interface, that additional information can be useful without requiring extra integrations.

Provider transparency

SwapSpace takes a more transparent approach by exposing information about each available exchange partner:

• supported exchange types (fixed or floating)
• KYC requirements
• refund requirements
• estimated processing information

ChangeNOW also aggregates liquidity from both centralized and decentralized exchanges, but the process is abstracted from the developer. Rather than exposing individual providers or multiple routing options, the API automatically selects an exchange route and returns a single quote for the requested swap. This simplifies integration for teams that prefer not to manage provider selection themselves.

Operational visibility

Once a swap has been created, both APIs provide status endpoints to synchronize transaction status with the application UI.

ChangeNOW and SwapSpace both expose exchange statuses such as waiting, confirming, exchanging, sending, finished, refunded, and failed, making it straightforward to build progress tracking inside wallets, exchanges, or other Web3 products.

SwapSpace exposes additional information before an exchange begins. Developers can retrieve partner-specific details, including supported rate types, KYC level, refund requirements, prohibited countries, and other provider metadata. This information can be used to filter offers or build custom selection logic.

ChangeNOW keeps these implementation details behind its own infrastructure. Developers interact with a single crypto exchange API rather than individual providers, resulting in a simpler integration with fewer provider-specific parameters to manage.

Which API is better for different use cases?

The right API depends on the product you're building. A wallet supporting thousands of assets doesn't have the same requirements as a startup launching a simple exchange feature, and an application processing large trading volumes may prioritize liquidity differently than a mobile app focused on user experience.

Instead of asking which API is "better," it's more useful to ask which one fits your product and long-term plans.

The right choice depends on the type of product you're building.

SwapSpace API is well suited to products that need broad asset coverage and greater control over the exchange flow. Wallets, exchange services, payment platforms, and Web3 applications can access offers from 45+ liquidity providers through a single integration instead of connecting to each provider individually. This is particularly useful for products that want to optimize exchanges based on price, processing time, rate type, KYC requirements, or available liquidity.

ChangeNOW API may be a better fit for businesses looking for a broader crypto infrastructure solution. Alongside crypto swaps, it offers fiat on- and off-ramp services (available for business integrations), as well as products such as node infrastructure, custody solutions, crypto cards, and other services that allow teams to build additional functionality without integrating multiple vendors.

Final verdict

Both ChangeNOW API and SwapSpace API make it possible to add crypto swaps without building exchange infrastructure from scratch. They support REST integration, provide transaction tracking, and give developers the tools needed to launch exchange functionality inside wallets, exchanges, payment platforms, and other Web3 products.

The main differences lie in liquidity aggregation, provider visibility, asset coverage, and the level of developer control offered by each platform.

If you just need to add crypto swaps to your product, either API is a solid choice. But if you plan to optimize pricing, expand asset coverage, or continuously improve the exchange experience as your product grows, SwapSpace gives you more flexibility without adding extra integrations.

Ready to integrate SwapSpace API?

If you're looking for a crypto swap API that gives your product access to 45+ liquidity providers through a single integration, SwapSpace API is built for exactly that.

With one integration, you can:

• connect to 45+ liquidity providers;
• support 3,250+ cryptocurrencies and 600,000+ trading pairs;
• retrieve quotes from multiple providers;
• integrate an exchange widget or build your own interface;
• get technical support throughout the integration process.

Explore the API documentation or contact the team to discuss your integration.



FAQ

What is a crypto exchange API?

A crypto exchange API lets wallets, exchanges, and other applications add cryptocurrency swap functionality without building their own exchange infrastructure. It connects your product to liquidity providers through a single integration.

Which API supports more cryptocurrencies?

SwapSpace currently supports over 3,600 cryptocurrencies across 675+ blockchain networks, while ChangeNOW supports 900+ cryptocurrencies. If broad asset coverage is a priority, SwapSpace offers a larger selection.

Can I integrate fiat purchases through these APIs?

Yes, but the scope differs. ChangeNOW offers fiat on-ramp and off-ramp services for business integrations. SwapSpace supports fiat purchases through its integrated partners, while crypto-to-crypto swaps remain its primary focus.

Which API gives developers more control?

It depends on your needs. ChangeNOW keeps routing simple by selecting the exchange path automatically. SwapSpace exposes more integration parameters, allowing developers to compare multiple providers, filter offers, choose fixed or floating rates, and configure affiliate fees.

Do both APIs support revenue sharing?

Yes. Both ChangeNOW and SwapSpace offer revenue-sharing programmes for partners. SwapSpace also allows partners to set their own affiliate commission through the API, while ChangeNOW provides configurable commissions and ready-to-use widgets for monetisation.

Which API is better for scaling a crypto product?

Both APIs can support growing products. SwapSpace is generally better suited for projects that expect to expand asset coverage, liquidity options, or exchange routes over time, while ChangeNOW focuses on a simpler integration with a broader ecosystem of additional crypto services.

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This article is provided for informational purposes only and reflects information available at the time of writing. Platform features, fees, supported assets, and policies may change. SwapSpace does not guarantee the accuracy of third-party information, including data about ChangeNOW. This content does not constitute financial, investment, or legal advice. Crypto assets are highly volatile and trading involves risk. Always conduct your own research before using any platform or making financial decisions.