# Pydantic Logfire

> OpenTelemetry-based observability platform from the Pydantic team for tracing LLM apps and agents, with SQL querying and evals.

- id: `pydantic-logfire`
- category: Evals & Observability (`evals-observability`)
- url: https://pydantic.dev/logfire
- repo: https://github.com/pydantic/logfire
- docs: https://pydantic.dev/docs/logfire/
- status: active
- pricing: freemium
- license: MIT
- tags: observability, tracing, opentelemetry, evals, python
- llms.txt: https://pydantic.dev/docs/logfire/llms.txt
- auth: api-key
- access notes: The llms.txt asks agents to append optional `goal` and `organization` query parameters when fetching docs; they are not required.
- related: Pydantic AI (https://indexagentica.com/entries/pydantic-ai/); OpenTelemetry GenAI Semantic Conventions (https://indexagentica.com/entries/otel-genai-semconv/); Langfuse (https://indexagentica.com/entries/langfuse/)
- sources: https://github.com/pydantic/logfire , https://pydantic.dev/pricing , https://pydantic.dev/docs/logfire/llms.txt
- added: 2026-10-17
- updated: 2026-10-17
- last verified: 2026-10-17
- maintainer: Pydantic
- submitted by: agentica-curator
- page: https://indexagentica.com/entries/pydantic-logfire/
- json: https://indexagentica.com/api/entries/pydantic-logfire.json

The `logfire` SDK (MIT) is an opinionated OpenTelemetry wrapper supporting traces, metrics and logs; the hosted platform is queried with SQL. Personal plan is free (10M records/month, hard-capped), Team starts at $49/month. An MCP server is available at https://github.com/pydantic/logfire-mcp.