We looked through thousands of Blockchain APIs and put together a list of the most popular & cheapest ones available.

CoinAPI is a platform which provides fast, reliable and unified data APIs to cryptocurrency markets.

Here are some of the key features of CoinAPI:

- **Integration provider**
We are a high-quality, one-stop-solution market data provider for cryptocurrency markets.
All CoinAPI data is standardized. Market symbol details and asset codes are double-checked by real humans to ensure maximum quality

- **Data delivery**
Our data is delivered to you on-demand using well-documented and simple HTTP RESTful API in JSON, XML or CSV formats.
For more demanding integrations requiring real-time market data streaming, we have access through WebSocket and FIX protocols.

CoinAPI

The Blockchain Receive Payments API V2 is the quickest and easiest way to begin accepting automated bitcoin payments. 

**Receive Payments API V2**

- Accept bitcoin payments seamlessly
- You provide an extended public key (xPub) and we generate a unique, unused corresponding address for your customers to send payment to. We notify you of payments to that address instantly using a callback URL of your choosing.

- The Blockchain Receive Payments API V2 is the quickest and easiest way to begin accepting automated bitcoin payments. Consisting of just a simple HTTP GET request, you can be up and running in minutes.
- One of the difficulties involved with receiving bitcoin payments is the need to generate a unique address for each new user or invoice. These addresses need to monitored and stored securely. The blockchain receive payments API takes care of the generation and monitoring of addresses. We will notify your server using a simple callback whenever a payment is received.

Blockchain Receive Payments API V2

NOWNodes is a Blockchain-as-a-Service that provides access to Full Nodes and Explorers and 50+ blockchain networks  

**Full Nodes and Block Explorers**
_Get your crypto API for instant access to 40+ blockchain networks including BTC, ETH, and BSC which is over 1000 coins and tokens_

NOWNodes is a Blockchain-as-a-Service that provides access to Full Nodes and Explorers via API. 50+ blockchain networks supported. Choose a node that you need, use available methods and connect. Focus on building wallets, exchanges, dApss and everything else — we will do the rest.

The full list of Block Explorers and Full Nodes available on NOWNodes is presented here. NOWNodes provides access to over 40 most popular blockchain networks including BTC, ETH, DOGE, and BSC, which is almost every single coin and token from TOP100 CoinMarketCap.

**ONE API — LOTS OF SOLUTIONS**

- **Shared nodes**
The most affordable way to start and scale up your crypto ecosystem.
- **Dedicated node**
Your fully managed private nodes for the best crypto experience.
- **Block Explorers**
Always stay updated of your transactions.
- **Testnets**
For starting developing crypto system free and smoothly.
- **Websocket Connections**
The most advanced and safest technologies are here for your crypto business.

The full list of cryptocurrencies supported by NOWNodes includes Bitcoin (BTC), Ethereum (ETH), DigiByte (DGB), Dogecoin (DOGE), Verge (XVG), Groestlcoin (GRS), ZCoin (ZXC), Bitcoin SV (BSV), and Dash (DASH). The service’s accounts can be found on most popular social media and blogging platforms (Facebook, Twitter, Reddit, Discord, Medium), the SMM management being active and helpful, always ready for feedback. While the platform hasn’t gotten much development yet, it is important to remember it is relatively new — moreover, it has already gained a few positive reviews in the blockchain enthusiast community.

NOWNodes 

Bitcoin and Cryptocurrency Price API that powers your Crypto and Blockchain apps

Bitcoin and Cryptocurrency Price API that powers your Crypto and Blockchain apps

 **What you can build**
_4 successful projects you can build using our Bitcoin price API_

- Crypto mobile apps
Get reliable and up-to-date price feed for 1000+ cryptocurrency markets for your wallet, portfolio or notifier iOS and Android apps.

- Realtime analysis via Websockets
Analyse the price movement in real time and notice trends before everyone else.

- History analysis
Use our history data to analyse the price movements in the past and derive insights.

- Custom endpoints
Looking to expand your existing product in the crypto space? Get custom endpoint built that fits right into your existing products. 

 **Key benefits and features**
_Reliability and ease of use are of upmost importance to our users._

- Trusted
The world's longest operating bitcoin price index, used by many of the industry's leading businesses.

- High Availability
Enterprise grade cloud infrastructure providing approximately 100% uptime.

- Exchange Independent
Remove reliance on a single exchange, our index averages over 50 and is not effected by their downtime.

- Simple Integration
Detailed documentation and code snippets provided in various languages and hosted on github.

 Bitcoin Price API

Etherscan is the leading blockchain explorer, search, API and analytics platform for Ethereum, a decentralized smart contracts platform.

**Etherscan  API**
_Build Precise & Reliable Apps with Etherscan APIs_

**Access Ethereum Data**
We understand the data needs of Ethereum applications. From hackathon entries to enterprise solutions, our APIs are made for you.

- Scalable
Scale your application with the API plan that's appropriate for it.

- Reliable
Etherscan's API infrastructure ensures reliable delivery of up-to-date data.

- Integration
Provide and display blockchain data within your applications easily.

Etherscan  is the leading blockchain explorer, search, API and analytics platform for Ethereum, a decentralized smart contracts platform.
As a means to provide equitable access to blockchain data, we've developed the Etherscan Ethereum Developer APIs to empower developers with direct access to Etherscan's block explorer data and services via GET/POST requests.


Etherscan API

Adding real-time crypto prices to your app is now surprisingly simple.

**The simplest API for crypto prices**
_Adding real-time crypto prices to your app is now surprisingly simple._

- **Real-time prices**
Add real-time prices of coins like BTC, DOGE and thousands more to your application or website through our websocket streaming service

- **Rich metadata**
For all coins listed you get circulating supplies, social links, logos, block explorers, sparklines, and more. We’ve got it all

- **High availability**
With high availability and redundancy, optimal operational performance is ensured, even when Bitcoin spikes and FOMO is at the highest.

- **Low latency**
Our network will automatically connect you to one of our 90+ global edge locations, to give you the fastest response times.

Add real-time prices of cryptocurrencies, like Bitcoin, Ethereum, and Dogecoin to your app or website. Get metadata on every coin we have listed, such as circulating supply, block explorers, trading pairs, logos, and much more.


The Top 5 Blockchain Apis for Developers