Financial services
APIs for payments, banking data, market quotes, and forex — the building blocks of fintech apps and embedded finance.
1Forge Finance APIs
1Forge Finance API provides real-time stock / forex / crypto quotes — targeting traders and financial app developers.
Account and Transaction API Specification
UK Open Banking Account Information API (AIS) lets authenticated third parties read user bank account balance, transactions, and metadata with user consent.
Binance API
Binance API is the official API of the world's largest crypto exchange — spot/futures/options trading, account management, WebSocket real-time market streams.
Bitfinex API
Bitfinex API is the programmatic interface of veteran crypto exchange Bitfinex — spot, margin trading, derivatives, and unique funding (lending market) feature.
Blockchain.com API
Blockchain.com (formerly Blockchain.info) API provides Bitcoin block explorer data — BTC address balance, transactions, blocks, market quotes, Wallet API.
Bybit API
Bybit API is the programmatic trading interface for Bybit crypto exchange, known for derivatives (perpetuals, options) and deep liquidity.
Coinbase Exchange API
Coinbase Exchange API (formerly Pro / Advanced Trade API) provides programmatic trading on Coinbase's US-compliant exchange — spot, order book, account management.
CoinGecko API
CoinGecko API provides real-time price, market cap, volume, and historical data for 13000+ cryptocurrencies — the most popular free crypto data API.
CoinMarketCap API
CoinMarketCap (CMC) API provides cryptocurrency and exchange market data — one of crypto's most authoritative sources (Binance-acquired since 2020).
Confirmation of Funds API Specification
UK Open Banking Confirmation of Funds API (CBPII) lets third parties query if a user account has sufficient funds — returns only yes/no, not the actual amount.
Crypto.com Exchange API
Crypto.com Exchange API provides programmatic trading on Crypto.com's global exchange — spot, derivatives, margin trading; famous for NBA Lakers arena sponsorship.
CryptoCompare API
CryptoCompare API provides aggregated crypto market data — multi-exchange prices, historical candles, social media sentiment, news, ICO data.
dYdX API
dYdX is a decentralized derivatives exchange (perpetuals DEX) API — runs on StarkEx Layer 2, offering low-fee + on-chain settlement derivatives trading.
Event Notification API Specification - TPP Endpoints
UK Open Banking Event Notifications API lets TPPs (third parties) subscribe to bank event streams — async notifications for account changes, consent revocations, customer status changes.
ExchangeRate-API
ExchangeRate-API provides real-time and historical exchange rates for 160+ currencies — free tier without API key, conversion calculations supported.
Glassnode API
Glassnode API provides crypto on-chain data and market metrics — BTC/ETH holder distribution, exchange inflows/outflows, miner behavior, derivatives funding rates.
Klarna Payments API V1
Klarna Payments API is Europe's leading Buy Now Pay Later (BNPL) service — installments, pay-in-30-days, flexible payment options that improve consumer conversion.
Kraken API
Kraken Exchange API provides programmatic access to Kraken crypto exchange — spot, futures, margin trading; known for stability (no hack since 2011 founding).
KuCoin API
KuCoin API is KuCoin exchange's programmatic interface, known for rich altcoin listings — particularly friendly to emerging small-cap coin trading.
Messari API
Messari API provides crypto research-grade data — project fundamentals, tokenomics, on-chain metrics, research reports; preferred by institutional crypto research.
OKX API
OKX API (formerly OKEx) is OKX crypto exchange's programmatic interface — spot, derivatives, options, DeFi, NFT, with complete Web3 wallet integration.
Open Data API
UK Open Banking API is the UK's statutory banking API standard — third parties access user account data and initiate payments with user consent (PSD2 compliance).
Payment Initiation API
UK Open Banking Payment Initiation API (PIS) lets authenticated third parties initiate transfers from user bank accounts with user consent (A2A payments).
PayPal API
PayPal API provides integration of the world's most recognized payment method — one-time payments, subscriptions, payouts, merchant tools, Venmo (US).