Crypto
Cryptocurrency prices and market data
Alchemy API
Alchemy gives node access to Ethereum and other blockchains through JSON-RPC, for example to read the latest block or a balance without running a node. Requests are POST calls with a JSON body and JSON answers. Free with a free ...
Binance Market Data API
The Binance Market Data API gives public spot prices, order books, trades and candles, for example to chart a trading pair. Requests are GET calls to data-api.binance.vision with JSON answers, and data-stream.binance.vision ...
BlockCypher API
The BlockCypher API reads blocks, addresses and transactions on Bitcoin and other chains, and can post events to a webhook, for example to watch an address for payments. Requests are GET calls with JSON answers. Free, no key ...
Blockscout API
The Blockscout API reads blocks, addresses, tokens and transactions on Ethereum and other EVM chains, for example to show a wallet's token transfers. It has REST, JSON-RPC and GraphQL endpoints with JSON answers. Free with a free ...
Coin Boss API
Coin Boss is a free public REST API for real-time crypto derivatives market data. Developers call the documented endpoints (anonymous use needs no key) and get JSON for liquidations, open interest, funding rates, long/short ...
CoinGecko API
The CoinGecko API gives prices, market capitalisation, volume and price history for thousands of cryptocurrencies, plus data on exchanges, categories, trending coins and NFTs. It is widely used for crypto price widgets, portfolio ...
CoinLore API
The CoinLore API gives prices, market data, exchanges and daily candles for cryptocurrencies, for example to list the top coins on a page. Requests are GET calls with JSON answers, with up to 100 coins per ticker request. Free, ...
CoinPaprika API
The CoinPaprika API gives prices, market caps and volumes for cryptocurrencies, for example to show a coin's price in a portfolio app. Requests are GET calls with JSON answers. Free, no key needed, for personal use, up to 20,000 ...
Crypto Fear and Greed Index API
The Crypto Fear and Greed Index API from Alternative.me gives a daily market sentiment score from 0 to 100 with its history, for example to show the mood of the market on a dashboard. Requests are GET calls that answer in JSON or ...
DefiLlama API
The DefiLlama API gives total value locked per blockchain and DeFi protocol, plus token prices, for example to chart how much is deposited on a network. Requests are GET calls with JSON answers. Free, no key needed for the public ...
DEX Screener API
The DEX Screener API gives pairs, prices, liquidity and volumes from decentralised exchanges on many chains, for example to find the trading pairs of a token. Requests are GET calls with JSON answers. Free, no key needed, with ...
Etherscan API
The Etherscan API reads balances, transactions, contracts and token data on Ethereum and other chains, for example to list the transfers of an address. Requests are GET calls with JSON answers. Free with a free API key for ...
Kraken Spot REST API (public market data)
The Kraken Spot REST API gives public market data from the Kraken cryptocurrency exchange: ticker prices with ask, bid, last trade, volume, high and low for each trading pair, plus OHLC candles, order books and recent trades. Use ...
mempool.space API
The mempool.space API gives Bitcoin data: recommended fees, blocks, transactions, addresses, mining and the Lightning network, for example to suggest a fee before sending a payment. Requests are GET calls with JSON answers. Free, ...
Compare the crypto APIs
| Service | API key | Formats | Free use |
|---|---|---|---|
| Alchemy API | Needed, free | JSON | Free with a free API key for 30 million compute units a month and 15 requests a second. |
| Binance Market Data API | Not needed | JSON | Free, no key needed, for public market data only. |
| BlockCypher API | Not needed | JSON | Free, no key needed for read-only calls, up to 3 requests a second and 100 an hour. |
| Blockscout API | Needed, free | JSON | Free with a free API key. |
| Coin Boss API | Not needed | JSON | The documented endpoints are currently free to use. |
| CoinGecko API | Not needed | JSON | The free Demo plan needs a free API key and has a monthly call limit; paid plans offer more calls and data. |
| CoinLore API | Not needed | JSON | Free, no key needed, with about one request per second recommended. |
| CoinPaprika API | Not needed | JSON | Free, no key needed, for personal use, up to 20,000 calls a month per IP address. |
| Crypto Fear and Greed Index API | Not needed | JSON, CSV | Free, no key needed. |
| DefiLlama API | Not needed | JSON | Free, no key needed for the public endpoints; a paid Pro key adds more endpoints. |
| DEX Screener API | Not needed | JSON | Free, no key needed, with limits per endpoint such as 60 requests a minute. |
| Etherscan API | Needed, free | JSON | Free with a free API key for personal and research use, up to 3 calls a second and 100,000 a day on selected chains. |
| Kraken Spot REST API (public market data) | Not needed | JSON | Free, no key needed for the public market data endpoints, within Kraken's rate limits. |
| mempool.space API | Not needed | JSON | Free, no key needed, with rate limits that answer HTTP 429 when exceeded. |
Questions
Which free crypto APIs work without an API key?
Binance Market Data API, BlockCypher API, Coin Boss API, CoinGecko API, CoinLore API, CoinPaprika API, Crypto Fear and Greed Index API, DefiLlama API, DEX Screener API, Kraken Spot REST API (public market data) and mempool.space API work without a key, according to their documentation. Most keyless services ask you to keep the number of requests reasonable, and some ask for a User-Agent that names your app.
Are these crypto APIs really free?
The services here can be used without paying, at least on a free plan or free tier, often with limits such as a number of requests per day or non-commercial use only. The table above quotes what each service says about its free use; check the provider's own terms before you rely on it.
How up to date is this list?
The address of every service is checked about once a week, and services that stop working or stop being free are removed. This list last changed on November 9th, 2026.