Helicone
Lightweight LLM proxy for logging, cost tracking, and caching with zero code changes
Helicone is an LLM observability proxy that sits between your application and model providers. By changing one line of code (the base URL), every LLM call is automatically logged with cost, latency, prompt, and response data. It supports caching to reduce costs, request rate limiting, and custom properties for tagging requests by user or experiment.
Teams that want instant LLM call logging and cost visibility without instrumenting their codebase. The proxy model means zero changes to existing agent code.
Founders and engineers who want fast, low-friction observability. Free tier covers meaningful production volume; paid plans unlock custom dashboards and advanced features.
Agent Architecture Fit
Helicone slots into your blueprint as a transparent logging layer between the orchestration framework and the model API. Unlike SDK-based tracing tools, it requires no framework integration — useful for blueprints using custom orchestration or raw model APIs. It trades depth of trace data (no tool-level spans) for ease of setup. Use it as a first-pass observability layer; graduate to Langfuse when you need structured evaluation.
when you need deep trace-level observability including tool calls, multi-step reasoning spans, and evaluation workflows
Next step
Your agent starts with a blueprint.
A blueprint tells you which tools to use, where they fit, and how they connect — before you write a line of code.
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