Helicone

Helicone is an LLM observability platform with built-in caching, rate limiting, and cost tracking.

Features

• Request logging - Log all LLM requests and responses
• Caching - Cache responses to reduce costs
• Rate limiting - Control request rates per user
• Cost tracking - Monitor spending across models
• User analytics - Track usage by user or session
• Prompt templates - Manage and version prompts

Configuration

Helicone works as a proxy. Configure agentgateway to route through Helicone:

# yaml-language-server: $schema=https://agentgateway.dev/schema/config
binds:
- port: 3000
  listeners:
  - routes:
    - policies:
        urlRewrite:
          authority:
            full: oai.helicone.ai
        backendTLS: {}
        requestHeaderModifier:
          add:
            Helicone-Auth: "Bearer $HELICONE_API_KEY"
      backends:
      - ai:
          name: openai
          hostOverride: oai.helicone.ai:443
          provider:
            openAI:
              model: gpt-4o-mini
      policies:
        backendAuth:
          key: "$OPENAI_API_KEY"

Benefits with agentgateway

Using agentgateway with Helicone provides:

Learn more

• Helicone Documentation
• LLM Gateway