SimpleSwap API vs SwapSpace API: which crypto exchange API fits your platform?

A crypto exchange API can add swaps to a wallet, fintech app, media product, Telegram app, or DeFi platform. A successful offer request is only the tip of the iceberg. The harder question is what your product will depend on after launch: the breadth of liquidity sources, the range of available assets and routes, predictable exchange limits, reliable status data, and commercial terms that fit your expected volume.

SimpleSwap API and SwapSpace API both embed crypto exchange functionality. Both also aggregate liquidity rather than operate as a single exchange venue. The practical difference is how each API exposes that aggregation. SimpleSwap returns one route backed by its provider network. SwapSpace can return offers from multiple providers or select the best rate across them.

This comparison is for teams evaluating crypto swap APIs for their products. It covers architecture, asset and network coverage, documentation, transaction flow, partner economics, reliability, and support.

How we prepared the material

This comparison is based on the official API documentation and partner materials published by SimpleSwap and SwapSpace. We reviewed their API guides, documentation, and affiliate pages to compare routing architecture, supported assets and networks, rate modes, endpoint coverage, limits, authentication, partner rewards, reliability, and support.

The sources and public figures were reviewed on September 16, 2026. Because supported assets, routes, rates, and other API data can change, the figures in this article reflect the information available at the time of review.

SimpleSwap API and SwapSpace API at a glance

SimpleSwap exposes an affiliate API for crypto and fiat exchanges, with a separate DeFi API for same-network token swaps. SwapSpace exposes an aggregation API built around provider offers and route selection. The table summarizes what their public materials show on September 16, 2026.

Figures reflect official pages reviewed on September 16, 2026 and may change. Coverage, pairs, providers, rate modes, limits, and fiat routes vary by request.

Architecture: single provider vs exchange aggregator

SimpleSwap operates as a multi-source swap aggregator, combining liquidity from 20+ CEX and DEX providers with its own liquidity. The integration connects to a single API, while SimpleSwap handles the underlying routing and returns the quote. Provider selection remains within the SimpleSwap flow, so the integrating product does not need to manage individual liquidity providers.

SwapSpace aggregates offers from 40+ liquidity providers, including CEXs, DEXs, and private liquidity partners, and makes them available through a single API. The all-offers endpoint returns available options for a selected swap and can filter them by provider, rate type, direction, or routing type. The best-offer endpoint can return the offer with the highest output amount for the same request. This means the integrating product can work with multiple provider offers or select a specific provider instead of relying on a single routed quote.

Key difference: SimpleSwap keeps provider selection behind one branded quote. SwapSpace supports that one-result flow. It also preserves provider identity and route metadata when the product needs them. This distinction matters when provider visibility, KYC profile, rate type, or expected duration shapes the user flow.

Supported assets, networks, and pairs

SimpleSwap supports 2,050+ crypto assets across 280+ networks, including Bitcoin, Ethereum, Tether, Solana, XRP, Cardano, Monero, TRON, Arbitrum, NEAR Protocol, Polygon, and BNB Chain. Its API treats each asset and network as separate values, with networkFrom and networkTo defining the source and destination networks for a swap. This allows products to build cross-chain routes between supported assets and networks.

SwapSpace lists 3,600+ assets across 675+ networks. Its catalog covers native assets, including BTC, TRX, and XMR, RWA tokens, with PAXG among them, privacy coins, including ZEC and ZANO, plus memecoins like DOGE and PEPE, DeFi tokens like AAVE and UNI, stablecoins, and other asset categories. Its currency response provides asset and network codes, network names, contract addresses, deposit and withdrawal availability, memo requirements, and supported routing types. SwapSpace also enables cross-chain swaps, including routes involving native BTC, TRON, and Monero.

Key differences: SwapSpace lists a broader range of assets and networks, while the two APIs differ in how they expose routing information. SimpleSwap specifies the source and destination networks directly through networkFrom and networkTo, whereas SwapSpace returns available offers based on the selected assets and networks, with provider-level routing information included in the response.

💡If your product relies on specific assets or networks, the total number of supported assets is only part of the picture. Coverage can vary by route, amount, and provider availability, so it is worth comparing the assets and networks that matter most to your users.

Integration and documentation

SimpleSwap uses a conventional REST flow. Partners create separate crypto and fiat API keys in the affiliate account and send the relevant key in the x-api-key header. Its public materials cover currency and pair discovery, estimates, ranges, exchange checks, creation, history, and status lookup. A separate DeFi API, based on 1inch, handles supported same-network token swaps.

SwapSpace issues an API key during partner onboarding and expects it in the Authorization header. Its API v2 documentation covers currencies, partners, all offers, best offer, exchange creation, history, and status. Offer and partner responses carry provider, rate, routing, duration, limit, KYC, country, refund, and availability data. SwapSpace also offers a widget, button, link, and banners through its affiliate program. These are alternatives to a custom API integration, not part of the API workflow itself.

Key difference: SimpleSwap’s flow is more linear: discover a pair, obtain an estimate, validate the range, and create the exchange. SwapSpace builds provider and offer selection into the API model, which gives the integrating product more route data and more control over selection.

Transaction flow, rates, and limits

SimpleSwap loads currencies and pairs, requests an estimate, retrieves the permitted range, checks the exchange, and submits it. The fixed parameter distinguishes fixed-rate from floating-rate requests, while the ranges endpoint returns minimum and maximum amounts. After creation, the status endpoint reports the exchange state under the same API key.

SwapSpace requests all matching offers or the best offer, then creates the exchange with the selected provider. Fixed-rate offers include a rate ID. Floating-rate exchanges have no rate lock. Each offer carries its own minimum and maximum. The same API exposes exchange status, including waiting, confirming, exchanging, sending, finished, failed, refunded, verifying, and expired.

Key difference: SimpleSwap validates and routes the request within its own flow. SwapSpace returns provider-level offers and lets the product show several routes, filter them, or select one automatically. In both APIs, rate and limit data remain specific to the current pair, networks, amount, and rate mode.

Fees and monetization for partners

SimpleSwap pays affiliate rewards in USDT on completed crypto and fiat exchanges. Its Public API Guide lists a default 0.4% reward setting for crypto exchanges and says partners can raise it, which changes the user-facing rate. The same guide states that fiat keys use a fixed 0.4% fee. Partners can track performance in the affiliate account and request a withdrawal after the published threshold is met.

SwapSpace offers a free crypto exchange API with no separate integration fee. Its partner model uses revenue sharing, with affiliate commissions of up to 0.5% per transaction. Payout schedule, currency, calculation, and refund treatment are defined in the partner terms. The API also supports an optional affiliate-fee parameter for providers that allow it, while limits and percentages are configured for each partner. The SwapSpace affiliate program guide explains the monetization model and partner tools in more detail.

Reliability, support, and track record

SimpleSwap has been running since 2018. Its API page lists 99% uptime. This is a vendor claim rather than a public SLA, so contractual availability depends on the onboarding terms. Registered affiliates can use the Help Center and contact a personal manager, while the DeFi API page states that technical support for that product is available 24/7. 

⭐ As of September 2026, SimpleSwap’s Trustpilot profile shows a 4.1/5 TrustScore based on 2,618 reviews.

SwapSpace has been operating since 2019. Its B2B page lists 99.9% availability, a 350 ms response time, and a 10-minute incident-warning figure. These are vendor claims rather than a public SLA. The affiliate program offers 24/7 dashboard support, and onboarding provides a direct contact for integration questions. 

⭐ As of September 2026, SwapSpace’s Trustpilot profile shows a 4.5/5 TrustScore based on 937 reviews.

Key difference: SimpleSwap publishes a lower uptime figure and emphasizes affiliate and product support. SwapSpace publishes more operational metrics, including an incident-warning figure.

Which API fits your platform

The better fit depends on the amount of provider control the product needs, its asset mix, its preferred user interface, and how much routing data the team wants to own. To make these differences easier to compare, we’ve matched each API type with the financial products it is best suited for in the table below.

For products that prefer a managed route, SimpleSwap API can provide one branded quote, separate crypto and fiat keys, adjustable crypto rewards, and a documented sequence of discovery, estimate, range, validation, creation, and status calls. It can also suit teams that want a widget or referral tool before committing to a custom swap interface.

SwapSpace API is a stronger fit when the product needs provider-level offers, selected-provider filters, a best-offer option, KYC and country metadata, or broader stated asset and network coverage. By integrating the SwapSpace API, your product can access 40+ exchange providers, including SimpleSwap, through a single API integration. Review the documentation to assess the request and response model, then contact the partnerships team to confirm commercial terms, rate limits, and the providers enabled for your account.

FAQ

What is the difference between a crypto exchange API and a crypto trading API?

A crypto exchange API embeds a conversion flow between assets. It typically returns a quote or offer, a deposit address, and an exchange status. A crypto trading API connects to venue accounts, balances, order books, and order management. Wallet-to-wallet swaps usually use the first model. Active trading on a specific venue uses the second.

Is there a free crypto exchange API for businesses?

Yes. A provider can offer API access without an integration fee and use revenue sharing instead. SwapSpace describes its API this way. “Free” refers to access and onboarding, not to a fee-free blockchain transaction. The provider quote, network costs, fiat payment costs, and partner settings can still affect the final exchange economics.

What is the difference between an exchange aggregator API and a single-provider exchange API?

An aggregator API draws on more than one liquidity source through one integration. A single-provider API connects a product to one venue or one provider's own liquidity. SimpleSwap and SwapSpace are both multi-source products. SimpleSwap returns a route under the SimpleSwap service, while SwapSpace can expose offers and provider metadata before the exchange is created.

How long does it take to integrate a crypto swap API?

There is no reliable universal estimate. A basic quote request can be implemented quickly, but a production integration also needs asset and network handling, address and memo validation, exchange states, error handling, security review, analytics, and support processes. The timeline depends on the existing backend and the intended interface.

Do SimpleSwap and SwapSpace APIs support fixed-rate exchanges?

Yes. SimpleSwap uses a fixed parameter for pair discovery, estimates, ranges, checks, and exchange creation. SwapSpace can return fixed and floating offers, and a rate ID can lock a supported fixed offer when the exchange is created. Availability remains specific to the pair, provider, amount, and current liquidity.

How do partners receive rewards through SimpleSwap and SwapSpace APIs?

SimpleSwap says partners earn USDT on completed exchanges and manage withdrawals through the affiliate account. SwapSpace uses revenue sharing on completed swaps, with terms and enabled fee settings defined for each partner. Before forecasting revenue, confirm the qualifying status, payout currency, threshold, schedule, and refund treatment in the applicable agreement.

Do users need to complete KYC to swap through these APIs?

Not for every transaction, but neither API supports a blanket promise of no KYC. SimpleSwap can request verification under its AML/KYC policy. SwapSpace exposes a KYC level for each provider, and requirements vary by the selected route, jurisdiction, amount, and risk checks. The product should show the conditions returned for the chosen offer.

Can I use both APIs in the same product?

Yes, if both commercial agreements allow it. A provider-neutral internal model can map currencies, networks, quotes, exchange creation, and statuses from each API. The extra integration adds testing and support work, so it makes sense only when the second source improves coverage, routing control, or resilience for routes that matter to the product.