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MCPJam
Test, debug, and evaluate MCP servers across every major AI client
MCPJam is an open-source platform for testing and debugging MCP servers with OAuth flow testing, LLM-powered evaluations, and CI/CD integration.
Overview
MCPJam provides comprehensive testing and debugging tools for MCP (Model Context Protocol) servers. The platform includes an interactive inspector for exploring server behavior, OAuth and authentication debugging, cross-client testing capabilities, and LLM-powered evaluations that score tool choice and goal completion. Users can test how external AI clients use their MCP servers across 16+ major clients like ChatGPT, Claude, and Cursor. The core is open source and free, with additional features for teams including CI/CD integration, swarm testing with simulated users, and hosted user testing environments. All testing runs locally or in your own infrastructure, never accessing live traffic.
Pricing
Pricing model: Freemium
Free: $0/mo with 200 credits/day and 500 free eval iterations. Pro: $24/mo (billed annually at $288/year) with 5,000 credits/mo. Team: $199/mo (billed annually at $2,388/year) with 50,000 credits/mo. Enterprise: Custom pricing. Additional credits: $10 per 1,000 credits (Pro), $9 per 1,000 credits (T
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MCPJam specifications
| Section | Developer Tools |
|---|---|
| Origin | San Francisco, United States |
| Website | mcpjam.com |
| Votes2 | 0 |
MCPJam metrics
| Metric | Value |
|---|---|
| Domain Rating | 63 +1 (up) since last check |
| Trust Flow | 20 no change since last check |
| Citation Flow | 42 no change since last check |
| Referring domains | 399 no change since last check |
| External backlinks | 2,162 no change since last check |
Fact: Ahrefs Domain Rating checked 12 Nov 2026, fact changed 10 Nov 2026. Fact: top topic Computers/Internet/E-mail (17). Fact: Majestic checked 1 Nov 2026, fact changed 1 Nov 2026. Link facts from Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
MCPJam domain fact sheet
Open the fact sheet
| Domain age | 1 year |
|---|---|
| Registered | |
| Expires | |
| Registrar | Squarespace Domains LLC |
| DNSSEC | Signed |
MCPJam launch receipt sheet
What we have measured for MCPJam since it went live on SaaS Directory Info on 1 November 2026.
- 63 Domain Rating (Ahrefs) +1 (up) since launch
at launch: 62 (1 Nov 2026); latest: 12 Nov 2026 - 20 Trust Flow (Majestic)
first measured 1 Nov 2026 - 399 Referring domains (Majestic)
first measured 1 Nov 2026
Day 10 since launch. Next receipt: day 30, 1 Dec 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.
Got a launch coming up?
Step-by-step tips for before, during and after your launch, free to read on SaaS Directory Info.
- Prepare
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Frequently looked up
- Q1Do I have to keep up with every AI client myself?
- No. MCPJam maintains each client's current behavior so your tests reflect what users experience today.
- Q2How is MCPJam different from Datadog, Braintrust, or LangSmith?
- Those products evaluate an agent you control. MCPJam tests how external AI clients use your MCP server.
- Q3Is MCPJam really free?
- Yes. MCPJam is open source and free forever. You can start testing with 200 daily credits and 500 eval iterations by opening MCPJam in the web app, installing the desktop app, or running locally with npx @mcpjam/inspector@latest.
- Q4Do I need a credit card to start?
- No. Free doesn't require a credit card.
- Q5How do you test something non-deterministic?
- With evaluation, not brittle assertions. MCPJam scores tool choice, arguments, and goal completion across repeated runs, then shows why the score changed.
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MCPJam has a free listing. The owner can unlock the full profile with a paid launch for $5:
- Founder story (locked)
- Milestones (locked)
- Demo video (locked)
- Dofollow website link (locked)
See also
| Product | Origin | DR1 | Votes2 |
|---|---|---|---|
| liquid-technologiesXML code generator for C# and Visual Basic .Net that creates strongly typed object models from XML schemas | United Kingdom | 70 | 0 votes. Log in to vote for liquid-technologies in the file |
 APIGitGit-native platform for building, publishing, sharing, and securing APIs | United States | 36 | 0 votes. Log in to vote for APIGit in the file |
 eryxWebAssembly sandbox for running untrusted Python safely | not stated | 0 | 0 votes. Log in to vote for eryx in the file |
 TestFlows MachineRun your programs deterministically. Record, replay, and branch your runs. | not stated | 2 | 0 votes. Log in to vote for TestFlows Machine in the file |