Covalent

API

Unified multi-blockchain data API for developers

Overview

Covalent provides RESTful APIs to access unified historical and real-time data across 100+ blockchains (Ethereum, Polygon, BSC, Solana, etc.). Key endpoints include token balances, transaction histories, NFT metadata, DeFi protocol metrics, and blockchain events. Responses are in JSON format. Use cases: building cross-chain dApps, portfolio trackers, DeFi analytics tools, NFT marketplaces, and blockchain data dashboards—eliminating custom node infrastructure needs.

Example Integration (JavaScript)

script.js JS


fetch('https://www.covalenthq.com/docs/api/')
  .then(res => res.json())
  .then(data => console.log(data))
  .catch(err => console.error(err));

Key Features

RESTful API
JSON responses
100+ supported blockchains
Historical & real-time data
NFT/DeFi data endpoints
No self-hosted nodes required

Frequently Asked Questions

? Is Covalent free to use?

Yes, it offers a free tier with limited requests and chain access; paid tiers unlock higher limits and advanced features like priority support.

? Does Covalent require an API key?

Yes, an API key is mandatory for authentication—you can obtain one by signing up on the Covalent website.

? What blockchains does Covalent support?

Covalent supports over 100 blockchains, including Ethereum, Polygon, Binance Smart Chain, Solana, Avalanche, and Fantom.

Top Alternatives

Alchemy Compare

Infura Search Google

Moralis Search Google

The Graph Compare

Tool Info

Pricing Freemium

Category Blockchain

Platform Public API

Pros

⊕ Simplified cross-chain data access
⊕ Rich token/NFT/DeFi data sets
⊕ Well-documented
⊕ Reduces infrastructure overhead

Cons

⊖ Freemium tier has rate limits
⊖ Advanced features locked behind paid plans
⊖ Variable latency across chains