RPC Response Caching Layer Configurator

WHAT IT DOES

RPC Response Caching Layer Configurator helps you reduce latency and RPC costs by generating configuration files for caching layers placed between your application and EVM nodes. You provide your upstream RPC URL, choose a cache backend (Redis, Memcached, Varnish, or Cloudflare Workers KV), and define caching rules per RPC method with custom TTLs and key patterns. The tool generates ready-to-use configuration files for your chosen cache backend, including connection settings, default TTLs, and method-specific rules. This is essential for developers running high-volume applications, indexers, or any service that makes frequent RPC calls where response caching can dramatically reduce costs and improve performance.

HOW TO USE

Select your cache backend from the dropdown. Enter your upstream RPC URL, cache host, and cache port. Set a default TTL (time-to-live) in seconds for all methods. Define caching rules—one per line—in the format "method | ttl_seconds | key_pattern". For example: "eth_getBalance | 30 | balance_{address}_{block}" or "eth_call | 120 | call_{to}_{data}_{block}". The key_pattern supports placeholders like {address}, {block}, {data}, {topics}, {from}, and {to}. Click "Generate Cache Configuration." The tool builds a complete configuration file tailored to your selected backend, displays a summary of your rules, and provides a copy button to save the configuration. You can then deploy this configuration with your chosen caching service.

THE REAL MECHANISM

The tool uses a pure JavaScript template engine that operates entirely client-side. It selects a configuration template based on the selected cache backend: Redis generates a .env-style file with connection settings and rule definitions; Memcached generates a similar file with memjs-compatible syntax; Varnish generates a VCL (Varnish Configuration Language) file with backend definition and caching rules embedded in the vcl_recv subroutine; Cloudflare Workers KV generates a configuration file with KV binding instructions and rule definitions. For each rule, the tool validates the method name and extracts the TTL and key pattern. Placeholders in key patterns are preserved for runtime interpolation by the caching layer. All processing is done in the browser—no data is sent to external servers.

WHAT IT CANNOT SEE

This tool cannot automatically determine optimal TTL values for different RPC methods—you must choose appropriate values based on your application's needs. It cannot detect if the caching layer is actually running or if the configuration is valid for your environment. It cannot validate that the generated configuration will work with your specific setup, operating system, or Docker configuration. It cannot generate configurations for non-EVM RPCs. It cannot deploy the caching layer automatically—you must start the caching service yourself. It cannot test cache hit/miss rates or measure performance improvements. The tool does not verify that the upstream RPC URL is reachable.

PLEASE NOTE

RPC Response Caching Layer Configurator works for any EVM-compatible RPC endpoint and does not require a blockchain connection to function, though the network selector is provided for context. It is a configuration tool for developers, not an execution tool. It reads data only and does not send any information to external servers. The tool is free to use and does not require authentication. For best results, choose TTL values that balance freshness with cache efficiency for your specific use case.