Web3 businesses seeking to incorporate exchange functionality without building the complete technical stack in-house often rely on external crypto exchange APIs. These integration tools enable applications to embed token swaps, cross-chain transfers, and fiat on- and off-ramps directly into their user interfaces. Several prominent API providers offer distinct functionalities, asset coverage, and commission models to support business integrations.
ChangeNOW API
ChangeNOW functions as a non-custodial API designed to let Web3 businesses embed swap features directly into their products. The plug-and-play layer routes liquidity and handles execution while users remain on the host application. The service supports fixed-rate and floating-rate swaps, boasts a 350 ms response time, and maintains 99.99% reliability with 24/7 support.
- Asset Coverage: Over 1,500 crypto assets, 2 million trading pairs, 110 networks, and an optional fiat on/off-ramp supporting more than 70 fiat currencies.
- Commission: Flexible partner commission models starting from 0.4% per transaction, customizable by asset, pair, or swap size, with payouts available in both fiat and crypto.
1inch API
Operating more as an infrastructure suite than a simple swap endpoint, the 1inch API collection connects businesses to decentralized exchange (DEX) aggregation capabilities. It provides access to market data, price feeds, and swap functions suitable for cross-chain applications, portfolio dashboards, and trading interfaces.
- Asset Coverage: Optimized swap routing for thousands of ERC-20 tokens, stablecoins, wrapped assets, and real-world assets across 13 or more chains.
- Commission: Integrator fee settings allow businesses to add a small fee in basis points to swaps executed via their interface, which is deducted from output tokens and routed to a designated wallet.
0x API
The 0x swap API serves as a liquidity aggregator utilizing a smart order routing system to distribute transactions across multiple liquidity sources, aiming to minimize slippage. Featuring an uptime of 99.92% and sub-250 ms response times, the service targets Web3 platforms requiring precise control over on-chain execution.
- Asset Coverage: Access to over 9 million tokens drawn from more than 370 liquidity sources across 16+ chains, tapping directly into active token markets.
- Commission: Monetization options include an integrator fee model and a trade surplus model, where businesses retain positive slippage generated when execution improves upon the quoted price.
SimpleSwap API
SimpleSwap provides a lightweight exchange API tailored for applications requiring straightforward swap functionality. Businesses can select specific API keys restricted to crypto-to-crypto, fiat-to-crypto, or all exchange types, enabling users to execute swaps without leaving the host platform.
- Asset Coverage: More than 2,000 crypto assets across 280+ networks alongside over 40 fiat currency options.
- Commission: An affiliate-based model allowing businesses to customize rewards from 0.4% to 2% per completed exchange based on token, volume, or user segment, with earnings paid in USDT.
Fireblocks Wallet-as-a-Service
Fireblocks differs from the other providers by focusing on institutional custody and treasury management rather than swap aggregation. Its Wallet-as-a-Service (WaaS) API enables businesses to generate, secure, and manage user wallets, automate transaction flows, and receive activity webhooks.
- Asset Coverage: Over 1,500 assets with native support for 150+ blockchains, alongside raw signing capabilities for unsupported chains.
- Commission: Enterprise contract-based pricing calculated based on outgoing transaction volume, cold storage usage, platform user counts, and the total number of wallet addresses.
