audioproxy vs ProtocolProbe
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
audioproxy compared with ProtocolProbe
| Detail | 
audioproxy | 
ProtocolProbe |
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| What it does | Open-source audio transcoding proxy that renders variants on demand from signed URLs
| Free directory of MCP server facts with checked information from public records
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | Not given
| Not given
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| Pricing model | Free
| Free
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| Pricing | Open source and free to self-host
| Not given
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| Key features | - On-demand audio transcoding from signed URLs
- Multiple output formats: MP3, AAC, M4A, Opus, Ogg, FLAC, WAV, and peaks
- Audio trimming, fades, gain and EBU R128 loudness normalization
- Speech cleanup with enhance:voice preset
- Waveform peaks generation compatible with audiowaveform
- Expiring URLs excluded from cache key
- Render stream while encoding with real-time caching
- Range-capable seeking for cached variants
- Immutable cache with long-lived variant URLs
- Audio-only enforcement preventing video processing
| - 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
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| What makes it different | - URL-based API with no request bodies or server-side state
- Options normalize to same cache key regardless of order
- Streams first render to client while caching simultaneously
- Range-seeking on cached variants with CDN-friendly immutable policies
- Open source with Elixir implementation and reference signing algorithms
| - Scheduled re-checking of all facts on a regular basis, unlike the official registry which only checks on publication
- Every fact shown with its source and the date checked
- No ads, sponsors or paid placements; income never changes listings or rankings
- Corrections publicly logged and requests always answered with reasoning
- Open API accessible to everyone without authentication key
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| Free plan | Not given
| Not given
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| Open source | Not given
| Not given
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| Platforms | Not given
| Not given
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| Public API | Not given
| Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 2 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 19 | 3 |
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| Citation Flow (Majestic) | 20 | 22 |
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| Referring domains (Majestic) | 16 | 7 |
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4 details filled in for both companies.
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