Which RPC provider supports the widest range of blockchains?

When you're evaluating RPC providers for a multi-chain project, a common question is: which provider supports the widest range of blockchains? The short answer is that several providers now claim support for 100+ networks, but the real answer depends on what 'support' means—shared endpoints, dedicated nodes, archive data, WebSocket, and reliability all vary by provider.

Quick Answer: Which RPC Provider Supports the Most Chains?

Based on publicly listed coverage, providers like NOWNodes (120+), Ankr (70+), Dwellir (140+), and OnFinality (100+ including testnets) offer the widest raw network counts. However, 'widest range' should not be your only selection criterion. A provider may list 100 chains but only offer full archive and WebSocket support on a subset. For development teams that need deep support across several chains—including testnets, L2s, and parachains—it's better to evaluate the intersection of coverage and feature depth.

Multi-Chain RPC Coverage: Decision Checklist

Use this checklist when comparing providers by blockchain range:

How We Evaluate 'Widest Range' — Depth vs Breadth

Raw network count is a marketing metric. A provider that supports 150 chains but offers only basic JSON-RPC on 100 of them (no debug, no archive, no WSS) provides less practical value than a provider that fully supports 50 chains with all standard APIs. For example, OnFinality focuses on depth: each supported chain typically offers full archive data, WebSocket, and dedicated node options. Similarly, Dwellir emphasizes transparent pricing across a broad set of chains without compute units. Ankr offers a large multi-chain infrastructure with rate limits that vary by plan.

What 'Support' Really Means

When a provider says they support a blockchain, verify:

• Endpoint types: Are there both HTTP and WSS endpoints?
• Archive data: Can you query historical data from genesis? (Some providers charge extra or limit archive availability.)
• Rate limits: Are throttles the same across all chains?
• Method whitelisting: Can you use methods like eth_getLogs, debug_traceTransaction, or sol_getAccountInfo?

Comparison Table of RPC Providers by Network Count

Below is a comparison of providers that advertise wide blockchain coverage. Note that network counts change frequently; always consult the provider's documentation for the latest list.

Note: 'Networks Supported' includes mainnets and testnets. Always verify the exact list of production-ready chains.

When Broad Coverage Is (and Isn't) the Right Metric

Broad coverage is ideal when:

• You are building a multi-chain dApp that must interact with many networks (e.g., a cross-chain bridge or aggregator).
• You are a QA team testing across multiple testnets concurrently.
• You are an indexer that needs to pull data from many chains, even if only basic endpoints are needed.

Broad coverage is less important when:

• Your app focuses on one or two chains with high throughput requirements (e.g., Solana or Ethereum).
• You need deep API access (trace, debug, custom RPC methods) that only a subset of providers offer.
• You require dedicated node isolation for consistent performance—this is more about node quality than network count.

How to Test a Provider's Chain Support

Use a simple script to verify RPC availability and latency. Below is a JavaScript example using node-fetch to ping a provider's endpoint for a specific chain:

const fetch = require('node-fetch');

async function checkEndpoint(url) {
  const payload = {
    jsonrpc: "2.0",
    method: "eth_blockNumber",
    params: [],
    id: 1
  };
  try {
    const response = await fetch(url, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload)
    });
    const data = await response.json();
    if (data.result) {
      console.log(`Block number: ${parseInt(data.result, 16)}`);
      return true;
    }
  } catch (error) {
    console.error(`Endpoint failed: ${error}`);
  }
  return false;
}

// Example: test an OnFinality Ethereum endpoint
const endpoint = "https://eth.llamarpc.com"; // replace with provider's endpoint
checkEndpoint(endpoint);

For multi-chain verification, loop through endpoint URLs for each chain and measure response times.

How to Verify a Provider's Chain Support Before Committing

1. Read the network list documentation. Look for detailed notes on which methods and WebSocket are supported per chain.
2. Check for testnet endpoints. Many providers support mainnets but not testnets, which are critical for development.
3. Use the provider's dashboard to see real-time endpoint availability and usage stats.
4. Run a trial. Most providers offer free tiers (e.g., OnFinality's shared free plan) that let you test multiple chains.
5. Review SLAs and support channels. For each chain, confirm that the provider has active monitoring and support.

Key Takeaways

• Raw network count is a starting point, not a decision metric. Evaluate depth (archive, WebSocket, debug methods) for the chains you actually use.
• Providers like OnFinality, Dwellir, and NOWNodes offer the widest coverage, but each excels in different areas—OnFinality for Substrate/Polkadot ecosystems, Dwellir for transparent pricing, NOWNodes for sheer breadth.
• Always test endpoints yourself using scripts or the provider's free tier before committing to a paid plan.
• For production, dedicated nodes or private endpoints often provide more consistent performance than shared APIs, especially across multiple chains.
• Check OnFinality's supported RPC networks and RPC pricing to see if the coverage fits your project.

Frequently Asked Questions

Q: Which RPC provider has the most blockchains? A: Dwellir claims 140+ networks, followed by NOWNodes (120+) and OnFinality (100+). However, verify the actual list includes your target chains.

Q: Does OnFinality support all the chains it lists with WebSocket? A: Most chains on OnFinality offer WebSocket endpoints, but it's best to check the specific network page for details.

Q: Are there any providers that support every blockchain? A: No single provider supports every blockchain. Providers focus on popular EVM chains, Solana, Cosmos, Polkadot, and other major ecosystems. Always cross-reference with your project's requirements.

Q: How do I find if a provider supports a specific testnet? A: Most providers list testnets separately. For example, OnFinality supports Sepolia, Base Sepolia, and other recent testnets. Check the network documentation.

Q: Is it better to use multiple providers to increase chain coverage? A: Many production teams use a primary provider for most chains and supplementary providers for niche networks. This approach balances cost and reliability.