Best Ethereum Data APIs for Developers in 2026

Ethereum

API

DeFi

Developer Tools

• August 25, 2026

The short answer

Ethereum has more API providers than any other chain, and they fall into four groups that solve different problems:

RPC node providers — Alchemy, Infura, QuickNode. You need one to read contract state and send transactions.
Indexed data platforms — Bitquery, Covalent. Decoded transfers, DEX trades, balances, holders and traces, queryable without processing blocks yourself.
Explorer APIs — Etherscan. Convenient for verified source, ABIs and simple address lookups.
Custom indexers — The Graph. You write a subgraph when your data model is specific to contracts you deployed.

If you are building a dApp, start with an RPC provider. If you are building analytics, a dashboard, a trading product or a compliance tool, start with an indexed data platform — deriving DEX trades from raw RPC logs is weeks of work that someone has already done.

What to look for in an Ethereum API

Read-write or read-only. Transaction submission is an RPC job. Analytics is not, and paying RPC prices for analytical queries is a common way to overspend.
Decoded or raw. Logs are not trades. Turning Swap events across Uniswap v2, v3, v4, Curve, Balancer and hundreds of other venues into normalised trades with USD prices is the work you are buying.
Archive access. Historical state and full history matter for backfills, accounting and research. Archive nodes are expensive; bulk file delivery is usually cheaper.
Internal transactions and traces. Value moved by contracts does not appear in the top-level transaction list. If you are doing compliance or forensics, traces are non-negotiable.
Real-time delivery. Polling an RPC endpoint is not a streaming architecture. Look for WebSocket, Kafka or gRPC if you need push.

The best Ethereum APIs

1. Bitquery — best for decoded Ethereum data and analytics

Bitquery indexes Ethereum into a decoded GraphQL schema shared with 40+ other chains: DEX trades across 300+ venues, transfers, balances, token holders (real-time and historical), contract events, internal calls and full execution traces. It also streams pre-confirmation transactions from the Ethereum mempool, plus decoded MEV — sandwiches, arbitrage and liquidations.

Delivery spans GraphQL, WebSocket, Kafka with offset replay at under 500ms p95, an MCP server for AI agents, and bulk Parquet into S3 or your warehouse.

Best for: analytics, trading products, MEV research, compliance and forensics, multi-chain products that want one schema.

Limitations: no RPC endpoints and no transaction broadcasting. Pair it with an RPC provider if your app writes to the chain.

DEX API · Mempool API · Docs

2. Alchemy — best all-round Ethereum developer platform

Alchemy combines reliable RPC with enhanced APIs, webhooks, SDKs and account-abstraction infrastructure. For teams building consumer dApps it is the most complete toolkit in the category.

Best for: dApps, wallets, anything that submits transactions or needs embedded wallet tooling.

Limitations: decoded market data — OHLCV, holder distribution over time, realized PnL — is not the product. You build that layer.

3. Infura — best for stability and ubiquity

Infura is the longest-standing Ethereum RPC provider and remains a default choice, particularly for teams that value predictability over feature breadth.

Best for: straightforward RPC access with a well-understood operational profile.

Limitations: RPC and adjacent services; not an analytics layer.

4. QuickNode — best for global RPC performance

QuickNode runs a geographically distributed node network with streaming and serverless functions on top, plus an add-on marketplace.

Best for: latency-sensitive RPC across many chains from one vendor.

Limitations: you write your own decoding and aggregation.

5. Etherscan API — best for verified contracts and quick lookups

The Etherscan API is the fastest route to verified source code, ABIs, and simple balance or transaction-list lookups. Nearly every Ethereum developer uses it for something.

Best for: contract metadata, ABI retrieval, light address queries.

Limitations: built around explorer use cases rather than high-volume analytical workloads or streaming.

6. The Graph — best for protocol-specific indexing

If your data model is unique to contracts you deployed, a subgraph gives you exactly the entities you define. Substreams narrow the latency gap that traditional subgraphs left open.

Best for: protocol teams indexing their own contracts.

Limitations: you write, deploy, sync and maintain the subgraph — and re-sync it whenever the schema changes.

7. Covalent (GoldRush) — best for normalised multi-chain wallet data

Covalent normalises balances, transactions and NFT holdings across a very large number of chains behind one REST shape.

Best for: wallets and portfolio trackers that need breadth and a low integration cost.

Limitations: limited DEX depth and no streaming transports.

Ethereum API comparison

Provider	Category	Sends transactions	Decoded DEX trades	Traces & internal calls	Streaming
Bitquery	Indexed data	No	Yes, 300+ DEXs	Yes	WebSocket, Kafka, gRPC
Alchemy	RPC + tooling	Yes	Not a focus	Partial	WebSocket, webhooks
Infura	RPC	Yes	No	Partial	WebSocket
QuickNode	RPC	Yes	You decode it	Partial	Streams product
Etherscan	Explorer API	No	No	Limited	No
The Graph	Custom indexer	No	What you index	What you index	Query-based
Covalent	Unified REST	No	Limited	Limited	No

Which Ethereum API should you choose?

Building a dApp or wallet that transacts? Alchemy, Infura or QuickNode.
Building analytics, a screener or a trading product? Bitquery.
Indexing your own protocol's entities? The Graph.
Need ABIs and verified source? Etherscan.
Need pre-confirmation visibility or MEV data? Bitquery's mempool streams — Ethereum is one of the two chains where Bitquery offers them.

FAQ

What is the best free Ethereum API?

Most providers offer a free tier. Etherscan's API is free at modest rate limits and excellent for contract metadata. Public RPC endpoints work for prototypes. Bitquery includes a 7-day trial with live WebSocket streaming and no card, with paid plans from $49/month.

Can I get Ethereum DEX trade data from an RPC provider?

Only by building it. RPC gives you logs; turning those into trades means decoding each protocol, resolving token metadata and computing prices. Indexed platforms like Bitquery ship that already decoded across 300+ DEXs.

What is the difference between an Ethereum RPC and an Ethereum data API?

RPC talks to a node — current state, contract calls, transaction submission. A data API serves an index built from historical and live chain data — trades, transfers, holders, prices — with querying and aggregation the node cannot do.

How do I get Ethereum mempool data?

You need a provider connected to many nodes, since any single node sees only part of the network. Bitquery streams pre-confirmation transactions on Ethereum and BNB Chain, along with detected MEV.

Which Ethereum API is best for compliance and forensics?

One with internal calls and full execution traces, since contract-moved value never appears in top-level transactions. Bitquery exposes the full execution tree plus address labelling and money-flow tracing.