username-inspector
https://server.smithery.ai/username-inspector/username-inspector/mcpUsername Inspector gives your AI assistant two read-only tools for people who sell on resale marketplaces. check_username looks up one username or store name on twelve platforms: eBay, eBay Store, Poshmark, Grailed, Vinted, Whatnot, Bonanza, and Chairish are looked up directly (Poshmark, Vinted, and Bonanza most reliably; the others often block automated lookups and come back as unverified with a link), and Depop, Etsy, Mercari, and Ruby Lane return a profile link to open, because those sites block automated checks. Each platform comes back as available, taken, unverified, or error, with a link where one helps. compare_fees takes a sale price and, optionally, shipping charged, item cost, your shipping cost, and an eBay promoted listing rate. It returns fees, what you keep, and profit, margin, and ROI on eBay, Poshmark, Mercari, Depop, Etsy, Grailed, and Vinted, best first, using the same rates as the Username Inspector fee calculator, with the date each rate was last verified. It needs no account or key. It is rate-limited so it stays free for everyone, and results are informational: availability comes from each platform's public profile page, so confirm on the platform before relying on a name.
MCP readiness
Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here C+, 70.0/100), which weighs availability, conformance, p95 speed and descriptor. How the two differ
| Valid MCP handshake | 10/10 | initialize and tools/list both answered. |
| Live MCP endpoint | 25/25 | Endpoint answers the MCP initialize handshake (2330 ms). |
| Protocol revision | 8/10 | Speaks MCP 2025-11-25, 1 revision(s) behind 2026-07-28. |
| Signed descriptor | n/a | No MCP standard defines a signed server descriptor. |
| Uptime (30 days) | 15/15 | 30/30 probes succeeded over 30 days (100%). |
| Tool declaration | 5/10 | Lists 2 tool(s) with descriptions. |
| Verified identity | 5/10 | Publisher declared (repository, package or homepage); claim this listing to verify domain control. |
| Freshness + modern flags | 4/5 | seen in a source within 7 days. |
| Auth declaration | 2/5 | Declares credential scheme: smithery_api_key. |
Compared with peers
Against 53,039 reachable MCP servers in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.
- Readiness
- Higher than 55% of peers
- This listing 82 · peer median 81
- Latency
- Faster than 5% of peers
- This listing 1,472 ms · peer median 326 ms
Where it loses the most points, and how to win them back
- Tool declaration −5
— Declare every tool with a description and input schema.
Now: Lists 2 tool(s) with descriptions.
- Verified identity −5
— Claim the listing and prove control of its domain.
Now: Publisher declared (repository, package or homepage); claim this listing to verify domain control.
- Auth declaration −3
— State how to authenticate (an auth scheme, or that none is needed).
Now: Declares credential scheme: smithery_api_key.
Listed in
Directories this entry was found in.
How to connect
https://server.smithery.ai/username-inspector/username-inspector/mcpcurl -X POST https://server.smithery.ai/username-inspector/username-inspector/mcp \
-H 'Content-Type: application/json' \
-H 'Accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'