x402 Format Checker MCP Server
com.crewofthecaptain/format-checkerv1.3.0
IBAN, EU VAT, NIP, REGON, PESEL, email checks. Only $0.001 (0.1 cent) per check via x402 on Base
context tax
pending
security
pending
cold start
hosted
freshness
pending
Our reading of x402 Format Checker, from the data
x402 Format Checker is a email MCP server, listed in the official MCP Registry.
We haven't measured its tool list yet, so its token cost is unknown.
It runs as a hosted endpoint, so there is nothing to install.
Install x402 Format Checker MCP server
Install in Claude Code
claude mcp add --transport http format-checker https://validate.crewofthecaptain.com/mcpInstall in Cursor
{
"mcpServers": {
"format-checker": {
"url": "https://validate.crewofthecaptain.com/mcp"
}
}
}Install in Claude Desktop
{
"mcpServers": {
"format-checker": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://validate.crewofthecaptain.com/mcp"
]
}
}
}Or add it as a custom connector under Settings → Connectors. The config above bridges via mcp-remote.
Install in VS Code
{
"servers": {
"format-checker": {
"type": "http",
"url": "https://validate.crewofthecaptain.com/mcp"
}
}
}Install in Windsurf
{
"mcpServers": {
"format-checker": {
"serverUrl": "https://validate.crewofthecaptain.com/mcp"
}
}
}Remote endpoints
- streamable-http
https://validate.crewofthecaptain.com/mcp
Freshness
Not enough public signals yet to judge maintenance.
Last commit (default branch)
no data · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-10-11 · 7d ago · official registry · v1.3.0
How it compares in Email
Against the most-starred email servers we index. Token cost is per model turn, measured from each server's live tool list.
| Server | Stars | Tools | Tokens / turn | Freshness | Runs |
|---|---|---|---|---|---|
| x402 Format Checker (this) | — | — | not measured | — | hosted |
| Inbox Zero | 12,649 | — | not measured | Active | hosted |
| Useplunk | 5,524 | — | not measured | — | local |
| Google Workspace | 3,370 | — | not measured | Active | — |
| OpenOSINT | 1,776 | — | not measured | Active | local |
| emailmd | 1,382 | 3 | 954 | Active | local + hosted |
FAQ
›How do I install the x402 Format Checker MCP server in Claude Code?
Run: claude mcp add --transport http format-checker https://validate.crewofthecaptain.com/mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.
›Does x402 Format Checker require an API key?
No required environment variables are declared in its published metadata.
›Can I use x402 Format Checker as a remote (hosted) MCP server?
Yes. It is a hosted MCP server; connect to its URL with any client that supports remote MCP.
›Is x402 Format Checker in the official MCP registry?
Yes, as com.crewofthecaptain/format-checker.
Sources and method
- Official MCP Registry entry
- updated 2026-10-11
- Last checked against all sources
- 2026-10-19
The description, packages and links come from the maintainer's own published metadata. Token cost, security signals, freshness and the reading above are MCPSkillHub's own measurements; see the methodology. Spot an error? Request a correction or claim the listing.
Alternatives to x402 Format Checker
Other email MCP servers.