The Stack · Observability & evals (managed) API

Lunary

Lightweight open-source LLM observability, prompt management and analytics, tuned for chatbots and RAG.

API keyFreemium🔵 agent: self serve instant key

Get API key → instant key, usually no card Docs Website

CategoryObservability & evals (managed)

TypeAPI service

Authapi-key

PricingFreemium

Agent signup🔵 self serve instant key

SDKsPython, TypeScript, REST

Pricing: Free tier ~1,000 daily events; paid from ~$30/mo. Apache-2.0 open-source, self-hostable; cloud is SOC 2 Type II / ISO 27001.

🔵 Agents: self serve instant key

Instant self-serve — free signup gives a key immediately (a human unblocks an agent in under 2 minutes).

Grab a public/project key from the Lunary dashboard after free signup, or self-host with your own keys. No account-provisioning API.

Lunary — Lightweight open-source LLM observability, prompt management and analytics, tuned for chatbots and RAG.
Website: https://lunary.ai/
Docs: https://lunary.ai/docs
Get a key: https://app.lunary.ai
Agent signup: self serve instant key — Grab a public/project key from the Lunary dashboard after free signup, or self-host with your own keys. No account-provisioning API.
Auth: api-key
Pricing: freemium — Free tier ~1,000 daily events; paid from ~$30/mo. Apache-2.0 open-source, self-hostable; cloud is SOC 2 Type II / ISO 27001.
Full record: https://dreaming.press/api/tools/lunary.json

Machine record: /api/tools/lunary.json

Quickstart

# pip install lunary ; export LUNARY_PUBLIC_KEY=...
import lunary
from openai import OpenAI

client = OpenAI()
lunary.monitor(client)   # wraps the client to log every call
client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "tracked by Lunary"}],
)

python · full docs →

Lunary FAQ

What is Lunary?

Lunary is Lightweight open-source LLM observability, prompt management and analytics, tuned for chatbots and RAG. It's in the Observability & evals (managed) category of the dreaming.press tool directory.

Is Lunary free?

Lunary is freemium — free to start, paid plans for scale. Free tier ~1,000 daily events; paid from ~$30/mo. Apache-2.0 open-source, self-hostable; cloud is SOC 2 Type II / ISO 27001..

Can an AI agent sign up for Lunary automatically?

Almost — signup is instant and self-serve (a free key with no sales call), so a human can unblock an agent in under two minutes. Grab a public/project key from the Lunary dashboard after free signup, or self-host with your own keys. No account-provisioning API..

Does Lunary have an MCP server?

Lunary does not publish an official MCP server as of our last check.

Is Lunary open source?

Lunary is a hosted API service, not an open-source project.

What languages does Lunary support?

Lunary offers Python, TypeScript, REST.

Lunary

Quickstart

Lunary FAQ

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