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MCP servers tagged no-signup

5 live MCP servers tagged "no-signup", ranked by trust score. Tags come from package metadata and repository topics, so this list covers servers across every category that work with no-signup.

5
live servers
35
avg trust
1

MarkLayer

Annotate any webpage with drawings, comments, and highlights. Real-time collaboration for Chrome.

39
2

AI Caller

AI voice agent API — give your agent a phone, pay per call with Bitcoin Lightning. No signup, no subscription. MCP-native. Alternative to Vapi, Retell, Bland.

34
3

Book To Audiobook

Book-to-audiobook API — turn any EPUB/PDF/TXT into an audiobook in 600+ languages, with optional translation. Pay per character with Bitcoin Lightning. No signup.

34
4

Fax To Email

Fax-to-email API — open a 24h receive window, get faxes delivered to your inbox with optional OCR. Pay with Bitcoin Lightning, no subscription. MCP-native. Alternative to eFax, My…

34
5

Pay Per Use Fax

Pay-per-fax API — send a fax from a PDF URL or typed text, pay with Bitcoin Lightning. No contract, no monthly fee, no telecom account. MCP-native. Alternative to eFax, Phaxio, Do…

34
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