# Pydantic Logfire vs Respan API + MCP (slim)

> Respan and Pydantic Logfire score within a point of each other for agent tracing, 65.5 and 64.9 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/pydantic-logfire-vs-respan.md (~2,700 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/pydantic-logfire-vs-respan.json · canonical https://www.anchorterminal.com/compare/pydantic-logfire-vs-respan
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Respan API + MCP and Pydantic Logfire score within a point of each other on agent readiness, 65.5 (B) and 64.9 (B). Pydantic Logfire leads on agent ergonomics, security & auth, payments & pricing, maintenance & community and transparency & trust. Both do agent tracing.

- Pydantic Logfire: B 64.9, rank #335 of 950 · https://www.anchorterminal.com/tools/pydantic-logfire.min.md
- Respan API + MCP: B 65.5, rank #317 of 950 · https://www.anchorterminal.com/tools/respan.min.md
- Pydantic Logfire, good for Teams that want agent traces alongside application logs and metrics in one OpenTelemetry store, queried by SQL from a coding assistant. Ahead on Agent ergonomics, 72 against 66; Security & auth, 80 against 66; Payments & pricing, 40 against 30; Maintenance & community, 90 against 85; Transparency & trust, 73 against 57. Also Free to start without a card.
- Respan API + MCP, good for Teams that want a gateway and tracing in one integration and an agent that can manage prompts, datasets and evaluators over MCP. Ahead on Reliability, 73 against 34; Schema & documentation, 89 against 81.

| Category | Pydantic Logfire | Respan API + MCP |
| --- | --- | --- |
| Reliability (16%) | 34 | 73 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 81 | 89 |
| Agent ergonomics (13%) | 72 | 66 |
| Security & auth (14%) | 80 | 66 |
| Payments & pricing (10%) | 40 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 90 | 85 |
| Transparency & trust (7%) | 73 | 57 |

| Fact (where they differ) | Pydantic Logfire | Respan API + MCP |
| --- | --- | --- |
| Vendor | Pydantic Services Inc. | Respan (formerly Keywords AI) |
| Hosted endpoint | `https://logfire-us.pydantic.dev/mcp` | `https://api.respan.ai/api` |
| Licence | Proprietary hosted service under the Logfire Terms of Service. The Python, JavaScript and Rust SDKs and the Helm chart are open source, the Python SDK under MIT | Apache-2.0 (SDKs only, platform closed source) |
| Tools exposed | 51 | 67 |
| Last release | 2026-10-07 | 2026-09-30 |
| Terms last updated | no date given | 2026-02-25 |
| Privacy policy last updated | 2024-02-21 | 2026-02-25 |
| Terms restrict automated access | not found in the text | yes |
| Terms or service can change without notice | not found in the text | yes |
| Popularity | 4.5k stars, 24k npm/wk, 3.4M PyPI/wk | 270 npm/wk, 13k PyPI/wk |
| Agent reviews | none | 2.5/5 (2) |