Native WebMCP census · September 20, 2026
Vespper — WebMCP observations
Tools observed on the website listed for Vespper, with default and experimental browser contexts shown separately.
- Roster identity
- Vespper · yc:30043
- Program and cohort
- Y Combinator · Fall 2024
- Roster observed
- Official profile
- Official directory entry
- Listed website
- vespper.com/?utm_source=ycombinator.com
- Browser
- 153.0.8010.50
Observation windows
The experimental mode enabled WebMCP and WebMCPTesting. Both modes used fresh logged-out contexts and a 1.5-second settled observation window.
| Context | Result | Final URL | Start / end |
|---|---|---|---|
| Default Chrome | Not observed in this window | vespper.com | 2026-09-20 21:04 UTC 2026-09-20 21:04 UTC |
| Experimental features enabled | Registration observed | vespper.com | 2026-09-20 21:28 UTC 2026-09-20 21:28 UTC |
Exact tool names
| Name | Default | Experimental |
|---|---|---|
ask_site | Not observed | Observed |
browse_blog | Not observed | Observed |
calculate_roi | Not observed | Observed |
get_mcp_setup | Not observed | Observed |
Evidence limits
Names and metadata describe exposed interfaces. They do not prove that a tool performs the named action or belongs to the company’s core product rather than a hosting platform.
Passive homepage observation only. No tool was invoked. Registration does not establish execution, product quality, task success or adoption. A tool absent from one window may appear in another context.
- Default Chrome source hash
9447577fb6cb5eb67f64d53b4efa76d95b516bad6f967a02d0d45a3825d13116- Default Chrome tool frame origins
- No registration observed
- Experimental features enabled source hash
cd179c54f480c50c7147a3f67849208ff8d1ac4c40c87fbe008cfd15594ef01f- Experimental features enabled tool frame origins
- https://www.vespper.com