1 Best APIs for 850+ Trading Pairs in Nigeria

ChangeNOW is a non-custodial instant cryptocurrency exchange service that provides an API for embedding crypto-to-crypto swaps directly into wallets, apps, and platforms. Unlike centralized exchanges (Binance, Coinbase) that require user account creation, KYC verification, and custody of funds on the exchange, ChangeNOW operates as a swap service: users provide their source asset and destination wallet address, ChangeNOW executes the exchange across its liquidity network, and the converted asset lands directly in the user's own wallet. The entire swap is non-custodial — ChangeNOW never holds user funds beyond the brief swap execution window. For Nigerian developers building crypto wallets, payment processors, and DeFi applications, ChangeNOW is one of the most practical APIs for providing swap functionality. Nigeria's crypto users frequently need to convert between assets — swapping Bitcoin received from a remittance into USDT for stability, converting accumulated altcoins into BTC for cold storage, or exchanging ETH for BNB to take advantage of lower gas fees. Without a swap API like ChangeNOW, these conversions require users to go to an exchange, which is cumbersome and, for some Nigerian users, inaccessible due to exchange restrictions. The exchange rate estimation endpoint (/exchange/estimated-amount) is the starting point for any swap flow. Given a source currency (e.g., BTC), destination currency (e.g., USDT), and amount, it returns the estimated output amount, the exchange rate, and the estimated completion time. This allows Nigerian applications to show users the exact expected output before they initiate the swap — building trust and transparency in the exchange process. ChangeNOW supports both floating rate and fixed rate exchanges. With floating rates, the final output amount may differ slightly from the estimate due to market movements during the brief swap window — the user gets the market rate at execution time. With fixed rates, ChangeNOW locks in the exchange rate for a short window (typically 30-120 seconds) during which the user must send the source asset — the output is guaranteed at the quoted amount. Fixed rates are more user-friendly for Nigerian users who want certainty about what they will receive. Creating an exchange (/exchange) generates a unique deposit address where the user must send the source asset. The API returns this address, the expected output amount, and an exchange ID for tracking. Once ChangeNOW detects the incoming funds, it executes the swap and sends the converted asset to the user's destination address. The entire process typically completes in 2-15 minutes depending on the blockchain confirmation requirements for the source asset. Transaction status tracking via the /exchange/by-id endpoint allows applications to display real-time swap progress to Nigerian users: waiting for deposit, confirming source blockchain, exchanging, sending to destination, and completed. This status feed is important for user experience — crypto swaps are not instant, and users need reassurance that their funds are being processed correctly. Coverage of 850+ trading pairs means Nigerian users can swap virtually any commonly held cryptocurrency. The coverage includes Bitcoin (BTC), Ethereum (ETH), USDT (on Tron, Ethereum, and BNB Chain), BNB, Solana (SOL), XRP, Dogecoin, and hundreds of altcoins. Minimum amounts vary by pair based on liquidity conditions and blockchain fees; the API provides a minimum amount endpoint so applications can validate user input before attempting a swap. The API is completely free — ChangeNOW earns revenue from the spread between exchange rates, so there are no subscription fees or per-call charges for API usage. A free API key is obtained from changenow.io/api with no credit card required, and no geo-blocking for Nigerian developers has been reported.