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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "email-preflight": {
      "type": "http",
      "url": "https://email-preflight-mcp.onrender.com/mcp"
    }
  }
}

claude mcp add --transport http email-preflight https://email-preflight-mcp.onrender.com/mcp

[mcp_servers.email-preflight]
url = "https://email-preflight-mcp.onrender.com/mcp"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "email-preflight": {
      "type": "remote",
      "url": "https://email-preflight-mcp.onrender.com/mcp",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "email-preflight": {
      "type": "http",
      "url": "https://email-preflight-mcp.onrender.com/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=email-preflight&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vZW1haWwtcHJlZmxpZ2h0LW1jcC5vbnJlbmRlci5jb20vbWNwIn0%3D"
}

{
  "servers": {
    "email-preflight": {
      "type": "http",
      "url": "https://email-preflight-mcp.onrender.com/mcp"
    }
  }
}

{
  "mcpServers": {
    "email-preflight": {
      "httpUrl": "https://email-preflight-mcp.onrender.com/mcp"
    }
  }
}

extensions:
  "email-preflight":
    enabled: true
    name: "email-preflight"
    type: streamable_http
    uri: "https://email-preflight-mcp.onrender.com/mcp"
    timeout: 300

Quality 73 / 100needs work

protocol88 · weight 25

pass
protocol.modernsupports 2026-07-28 (server/discover)
pass
protocol.statelessanswers without a session
pass
protocol.transportstreamable HTTP
warn
protocol.list_ttltools/list declares ttlMs 0, so clients re-fetch it on every use

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene71 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
fail
tools.annotationsno tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: email_check_mini (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); url_preflight (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); email_preflight (readOnlyHint, destructiveHint, idempotentHint, openWorldHint)
pass
tools.token_costabout 491 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability50 · weight 15

pass
stability.changes4 tool changes in 30 days
fail
stability.rug_pull1 tools kept their name but changed most of their description in 30 days; review before trusting them

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

3 tools, about 491 tokens to load them all · tool set 05de3fd6760c · tools last changed 2026-10-16 · checked 2026-10-20 14:54 UTC

Tool changes

2026-10-16url_preflightadded
Inspect public HTTP/HTTPS URL response metadata through the existing safe URL API. $0.001 USDC on Base mainnet. Unpaid calls return x402 v2 requirements. A compatible client may repeat the identical url argument with its own signed PaymentPayload in params._meta["x402/payment"]. This bridge does not fetch that URL directly, sign payments, or settle independently.
2026-10-16email_check_miniadded
Check email syntax, MX and local domain classes with the existing API. $0.001 USDC on Base mainnet. MX does not prove mailbox existence. Unpaid calls return x402 v2 requirements for this request. A compatible client may repeat identical arguments with its own PaymentPayload in params._meta["x402/payment"]. The adapter does not sign or settle independently.
2026-10-16email_preflightchangeddescription
before
Use before sending or processing an email when you need current preflight facts about the address. For $0.001 USDC on Base mainnet, the existing Email Preflight API checks six facts: syntax validity, domain availability, MX availability, disposable-email detection, role-account detection, and free-provider detection. Example paid result shape: { email: "[email protected]", syntax: "valid", domain: "exists", mx: "found", disposable: "not_listed", role_based: "not_detected", free_provider: "not_detected" }. MX records do not prove that a mailbox exists. Unpaid requests return the original upstream HTTP 402 challenge. This adapter never signs or pays.
after · 79% of words in common
Use before sending or processing an email when you need current preflight facts about the address. For $0.001 USDC on Base mainnet, the existing Email Preflight API checks six facts: syntax validity, domain availability, MX availability, disposable-email detection, role-account detection, and free-provider detection. Example paid result shape: { email: "[email protected]", syntax: "valid", domain: "exists", mx: "found", disposable: "not_listed", role_based: "not_detected", free_provider: "not_detected" }. MX records do not prove that a mailbox exists. Unpaid requests return the original upstream HTTP 402 challenge. A compatible x402 client may retry with its own signed PaymentPayload in params._meta["x402/payment"]. This adapter never signs, owns a wallet, or settles independently.
2026-10-02email_preflightchangeddescriptionmeaning changed
before
Connects to the existing Email Preflight API. Unpaid requests return the original upstream HTTP 402 body and PAYMENT-REQUIRED header. This adapter never signs or pays.
after · 25% of words in common
Use before sending or processing an email when you need current preflight facts about the address. For $0.001 USDC on Base mainnet, the existing Email Preflight API checks six facts: syntax validity, domain availability, MX availability, disposable-email detection, role-account detection, and free-provider detection. Example paid result shape: { email: "[email protected]", syntax: "valid", domain: "exists", mx: "found", disposable: "not_listed", role_based: "not_detected", free_provider: "not_detected" }. MX records do not prove that a mailbox exists. Unpaid requests return the original upstream HTTP 402 challenge. This adapter never signs or pays.

Full history: list_changes · trend: quality JSON.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 49 / 100

no-repositoryunreachable

provenance35

liveness8

freshness100

hygiene80

-unreachable(3 failures) +updated-4d-ago -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://email-preflight-mcp.onrender.com/mcp` streamable-http	none	no (3 failures)	94%	430 ms	2026-07-28, 2025-11-25, 2025-06-18, 2025-03-26	2026-10-17

Tools (3)

`email_check_mini`	Check email syntax, MX and local domain classes with the existing API. $0.001 USDC on Base mainnet. MX does not prove mailbox existence. Unpaid calls return x402 v2 requirements for this request. A compatible client may repeat identical arguments with its own PaymentPayload in params._meta["x402/payment"]. The adapter does not sign or settle independently.
`email_preflight`	Use before sending or processing an email when you need current preflight facts about the address. For $0.001 USDC on Base mainnet, the existing Email Preflight API checks six facts: syntax validity, domain availability, MX availability, disposable-email detection, role-account detection, and free-provider detection. Example paid result shape: { email: "[email protected]", syntax: "valid", domain: "exists", mx: "found", disposable: "not_listed", role_based: "not_detected", free_provider: "not_detected" }. MX records do not prove that a mailbox exists. Unpaid requests return the original upstream HTTP 402 challenge. A compatible x402 client may retry with its own signed PaymentPayload in params._meta["x402/payment"]. This adapter never signs, owns a wallet, or settles independently.
`url_preflight`	Inspect public HTTP/HTTPS URL response metadata through the existing safe URL API. $0.001 USDC on Base mainnet. Unpaid calls return x402 v2 requirements. A compatible client may repeat the identical url argument with its own signed PaymentPayload in params._meta["x402/payment"]. This bridge does not fetch that URL directly, sign payments, or settle independently.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "io.github.tasuyoapp-ctrl/email-preflight",
  "title": "Email Preflight",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://email-preflight-mcp.onrender.com/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "0.3.0",
  "description": "x402 v2 payment requests; relays compatible clients' signed payments to the existing product API."
}