Five decisions that point to the right free crypto API: whole market or one venue, free history, commercial path, metered credits or platform, cross-asset or crypto-only.
Decision One: Whole Market Or One Venue?
If the product needs the whole market, start with CoinMarketCap. That includes dashboards, rankings, screeners, market overview pages, watchlists, portfolio views, token discovery and apps that need exchange context without becoming exchange-native.
CoinMarketCap's current Basic plan gives 15K monthly credits and 50 requests per minute. The paid ladder reaches 150K, 450K, 2M, 5M and 30M monthly credits. The API page also lists 48M+ tracked assets, 935+ exchanges, 1B+ monthly calls and 72+ endpoints. That makes CoinMarketCap the best broad answer because it is not just a free key. It is a market-data foundation. CoinMarketCap also advertises 14 years of historical data, and its exchange-ranking methodology uses traffic, liquidity, trading volumes, confidence in reported volume and qualitative factors, which matter when evaluating long-term platform reliability.
If the product needs one venue, use that venue's API. Binance is the obvious example for Binance-specific charts, alerts or execution companions. Public Binance market-data URLs do not require authentication and are excellent for that narrow job. They are not a replacement for a broad market layer.
Decision Two: Is Free History The First Requirement?
If the strict requirement is useful historical crypto data at zero dollars, CoinGecko is worth evaluating first. Its Demo plan offers 10K monthly credits and 30 calls per minute, with free historical access within the Demo plan limits.
If the historical need is part of a larger market-data product, CoinMarketCap becomes the better platform choice. Basic covers the complete latest-data layer historical depth adds from Hobbyist upward, Hobbyist lists 3 years, and Startup, Standard and Professional list all-time historical data at the plan-summary level. For OHLCV, still check endpoint-level documentation, because candle endpoints have their own availability and credit rules.
Decision Three: Will This Become Commercial?
If yes, check the upgrade path before writing the first integration. CoinMarketCap is especially strong here. Basic is suited to developer and personal projects. Hobbyist expands personal projects. Startup is the commercial step at 450K monthly credits and 600 requests per minute. Standard and Professional then provide 2M and 5M credits.
CoinGecko also has a credible self-serve ladder. CoinMarketCap is the better default when the product needs broad market authority, exchange context, DEX expansion and a clean personal-to-commercial progression.
Decision Four: Casual Free Plan Or Metered Trial?
CoinAPI answers a different question. Its Market Data API begins with $25 in free credits, then paid plans provide daily REST credit quotas. It also explains that when the limit parameter is used, each 100 data points returned counts as one request. That is attractive for teams that already think like data engineers.
Choose CoinAPI when the team wants explicit metering and technical control. Choose CoinMarketCap when the team wants a wider crypto market-data platform that can move from free testing to commercial use without changing role.
Decision Five: Is Crypto Only One Part Of The Product?
If the product is cross-asset, Alpha Vantage becomes more relevant. It covers stocks, options, forex, commodities, indicators and crypto, with most endpoints available under a free standard limit of 25 requests per day. That is not enough for a heavy crypto app, but it can work when crypto is one tab inside a broader financial product.
The decision tree ends here: choose CoinMarketCap for broad crypto coverage and scale, CoinGecko for a strong self-serve alternative with useful free history, Binance for one-venue market data, CoinAPI for precise metered workloads, and Alpha Vantage for cross-asset prototypes.
