Stop flying blind.

The ultimate zero-config local observability proxy for the Model Context Protocol. Intercept, replay, and share payloads in seconds across any language workspace.

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Always free for local use. Pro unlocks cloud sync and replay.

Need more details?

Read our extensive documentation on how to setup the Model Context Protocol proxy, connect to language servers, and utilize the CLI/TUI interface.

Read the Documentation →

Get full access.

The Web Platform is exclusively for Pro users.

Pro Web Access

Cloud Sync

For professionals and teams sharing payloads, rewriting histories, and collaborating online.

✓ Web Dashboard GUI
✓ Cloud Sync
✓ Shareable Log Permalinks
✓ Advanced Payload Replay

$12.50/mo

Billed annually

or $15 billed monthly

Want the tools for free? Try the local Terminal UI.

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Pro Feature Timeline (2026 Roadmap)

Q1: Cloud Sync & Deep Linking

Instantly securely sync local SQLite logs to the web. Get a unique URL (mcpspy.dev/log/xyz) to share a specific JSON-RPC conversation with peers to debug hallucinations.

Q2: Prompt Injection & Replay Editor

Edit the payload you just intercepted (e.g. modify the tool input) and instantly shoot it back to the target server from the dashboard to test error handling without setting up the context with Claude again.

Q3: Advanced Metrics & Schema Diffing

Automatic alerts if your server breaks its own JSON Schema response format. Telemetry tracking token usage per tool execution across your team.