Developer Tools
ProtocolProbe
Free directory of MCP server facts with checked information from public records
- 0community votes
- 0DR by Ahrefs no change since last check
Ahrefs Domain Rating listed 6 Nov 2026, relisted 3 Nov 2026.
Free, read-only JSON API providing checked facts about servers in the official MCP Registry, with no authentication required and CC BY 4.0 licensing.
What it is
ProtocolProbe: the homepage
ProtocolProbe is a free directory and API that publishes facts about every server in the official MCP Registry. It reads public records and checks information on a schedule, presenting dated facts with their sources. The site, API, data and self-test command are all free to use. ProtocolProbe is run by Team Sultan, an independent team. The service includes server listings, comparisons, rankings by downloads and GitHub stars, and tools for publishers to test their own servers.
Listed capabilities
- Free JSON API with no authentication required
- Server search and filtering by name and description
- Rankings by downloads, stars and record checks
- Server comparison and topic filtering
- Self-test command for your own server
- Record checks with badge for README
- Corrections log tracking fact updates
- CC BY 4.0 licensed data export
- Change tracking for registry updates
- Allowlist export for company filtering
Pricing
Pricing model: Free
Follow ProtocolProbe for an email about each milestone, update and new product they post, in a daily summary.
ProtocolProbe metrics
| Metric | Value |
|---|---|
| Domain Rating | 0 no change since last check |
| Trust Flow | 3 no change since last check |
| Citation Flow | 22 no change since last check |
| Referring domains | 7 no change since last check |
| External backlinks | 22 no change since last check |
Ahrefs Domain Rating listed 6 Nov 2026, relisted 3 Nov 2026. Listed under topic: Arts/Online Writing (3). Majestic listed 3 Nov 2026, relisted 3 Nov 2026. Link data listed by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
ProtocolProbe domain listing data
Show the listing data
| Domain age | 1 month |
|---|---|
| Registered | |
| Expires | |
| Registrar | NameCheap, Inc. |
| DNSSEC | Not signed |
ProtocolProbe launch receipt entry
| Measure | At launch, then latest |
|---|---|
| Domain Rating (Ahrefs) | 0 to 0 no change since launch 3 Nov 2026, then 5 Nov 2026 |
| Trust Flow (Majestic) | 3 first measured 3 Nov 2026 |
| Referring domains (Majestic) | 7 first measured 3 Nov 2026 |
Day 2 since launch. Next receipt: day 30, 3 Dec 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
Before you launch
The playbook on SaaS Directory List lists what to prepare, what to post on launch day and where else to list your product.
Compare and explore
Quick answers
What does the API provide?
The ProtocolProbe API provides free, read-only JSON access to facts about every server in the official MCP Registry. It requires no authentication key and includes endpoints for individual servers, all servers paginated, metadata, badges, and change records.
How often are facts re-checked?
The official MCP registry only checks entries when new versions are published, but ProtocolProbe re-checks facts on a schedule to provide developers with up-to-date information. Specific check frequencies vary by fact type, such as daily for new entries and monthly for others.
What makes ProtocolProbe neutral?
ProtocolProbe uses no ads, sponsors, or paid placements. Payment never changes listings, record checks, or rankings. All rankings come from public numbers using the same methodology for every server. Any mistakes are logged in the corrections log.
Can I use the data and API data commercially?
Yes. The data is licensed under CC BY 4.0, which allows reuse with attribution. The API response includes license details and requires you to provide the notice and credit line when reusing the data.
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ProtocolProbe 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)
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