RPC Failover Configuration Tool

WHAT IT DOES RPC Failover Configuration Tool is a read-only developer tool that tests multiple RPC endpoints and generates ready-to-use failover configurations for EVM-based applications. It sequentially tests each user-provided endpoint using eth_blockNumber (latency), eth_chainId (network validation), web3_clientVersion (node identification), and eth_gasPrice (network conditions). The tool sorts healthy endpoints by latency, identifies the primary (fastest) endpoint, and generates a configuration with the primary and fallback endpoints in a round-robin load-balancing strategy. The output includes a JavaScript configuration snippet with a getProvider() function, retry logic, and proper error handling—helping developers build resilient applications that automatically failover to backup RPC endpoints when the primary provider fails. HOW TO USE Connect your EVM-compatible wallet via the BGWallet bridge and select the network you are targeting. Enter your RPC endpoints (one per line) in the textarea—include primary and backup providers (e.g., Alchemy, Infura, Ankr, public RPCs). Click "Test & Configure Failover" to run comprehensive health checks on each endpoint. Results include a summary of healthy endpoints, the primary endpoint selection, detailed test results per endpoint (status, latency, block number, chain ID), and a ready-to-use JavaScript configuration snippet. The generated code includes round-robin provider selection, retry logic, and error handling. All analysis is read-only—no signatures or transactions are submitted. TECHNICAL MECHANISM The tool uses ethers.js v5.7.2 to create a JsonRpcProvider for each user-provided endpoint and performs a sequence of RPC calls. For each endpoint, it measures: (1) eth_blockNumber latency (time to first response), (2) eth_chainId to validate the endpoint is on the expected network, (3) web3_clientVersion to identify the node type and version, and (4) eth_gasPrice to verify fee-related RPC functionality. The tool categorizes each endpoint as healthy (latency < 1000ms, correct chain), degraded (latency 1000-3000ms), slow (latency > 3000ms), wrong_chain, or unhealthy (any RPC method fails). Endpoints are sorted by latency and the fastest healthy endpoint is selected as the primary. The tool generates a JavaScript configuration with: (1) an array of endpoint URLs sorted by preference, (2) a round-robin getProvider() function that cycles through endpoints on each call, (3) a queryWithFailover() function that implements retry logic across all endpoints, (4) proper error handling and logging. The configuration is ready to be copied directly into a project. The tool also provides a visual status summary with color-coded health tags and detailed per-endpoint results. WHAT IT CANNOT SEE This tool has fundamental limitations that users must understand. It cannot automatically switch RPC endpoints in the user's application without manual integration—the generated configuration must be manually copied into the codebase. It cannot predict future endpoint failures or performance degradation—the health check is a point-in-time snapshot and does not guarantee future availability. It cannot handle endpoints that require complex authentication beyond URL parameters—API keys in the URL string are supported, but headers, request bodies, or OAuth are not. It cannot test endpoints behind firewalls or with CORS restrictions—the tool runs in the browser and cannot access private networks. It cannot manage API key quotas or rate limits across multiple endpoints—the tool does not track usage or enforce rate limits. It cannot detect endpoints that return stale or inconsistent data—the tool validates chain ID and block number existence but does not verify data correctness. It cannot assess endpoint availability over time without continuous monitoring. It cannot test WebSocket endpoints—only HTTP/HTTPS JSON-RPC URLs are supported. The generated code is a template and may require customization for specific application patterns. PLEASE NOTE This tool only supports EVM-compatible blockchains (Ethereum, Polygon, BSC, Avalanche C-Chain, Optimism, Arbitrum, and their testnets). Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. The tool is free, open-source, requires no API keys, and uses the wallet's native provider for all read operations. Always test failover configurations in a development environment before deploying to production.