Ratelimitly Documentation

Ratelimitly is a hosted rate-limiting service. This is the documentation hub for the wire protocol and every published client library.

Protocol

• Wire protocol specification — the normative spec: PDUs, TLVs, authentication, guards, and deduplication.

Client libraries

Client	Documentation	Repository
C	docs	rl-c-client
nginx module	docs	rl-nginx
Rust	docs	rl-rust-client
Python	docs	rl-python-client
Java	docs	rl-java-client
Spring	docs	rl-spring
JavaScript	docs	rl-js-client
Express	docs	rl-express

The Java client and the Spring Boot starter require Java 21 or newer. Build both from source while their first Maven Central releases are pending.

Elsewhere

• Ratelimitly portal — sign up, manage API keys, and view usage.
• All repositories — source, setup instructions, and examples for each public client.