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Delta Signal MCP Server

by daxfoundation-signal Your server? Claim it
not responding

Delta Signal is listed as active in the registry but did not answer our last check. It exposes 5 tools.

Audio steganography & watermarking. Encode/decode hidden messages that survive YouTube re-encoding.

Uptime history 11 days of history · worst day 0%
11 days agonow
0.0%
Uptime 24h
0 of 91 checks
5
Tools
read from the server
310 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 4

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 29 October 2026. No other catalogue keeps this.

1 Nov a tool description was rewritten describe_engine
1 Nov a tool changed the parameters it asks for render_signature
29 Oct a tool description was rewritten decode_audio
29 Oct a tool changed the parameters it asks for decode_audio

Delta Signal does not always answer

Over the last week it answered 49.5% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

run in your terminal
claude mcp add delta-signal --transport http https://signal.daxfoundation.org/mcp
Settings → Connectors → Add custom connector, then paste this address
https://signal.daxfoundation.org/mcp
~/.codex/config.toml
[mcp_servers.delta-signal]
url = "https://signal.daxfoundation.org/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "delta-signal": {
      "url": "https://signal.daxfoundation.org/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "delta-signal": {
      "type": "http",
      "url": "https://signal.daxfoundation.org/mcp"
    }
  }
}

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

decode
decode_audio
Decode every Delta Signal layer from a WAV, MP3 or M4A (AAC) file at an https URL: heartbeat cipher, spectral glyph, prime count, watermark (needs the seed used to render), ggwave, modem text and SSTV pictures (returned as PNG).
describe
describe_engine
Free. Describe Delta Signal: layers, stings, defaults, limits, presets and prices.
preview
preview_card
Free. Render the SSTV signature card image for a message (PNG) so you can see what the picture sting will carry.
render
render_signature
Render a Delta Signal audio signature (WAV, 48 kHz) that hides your message: in the heartbeat rhythm, as text in the spectrogram, as an inaudible watermark, and optionally as an SSTV picture, a ggwave data chirp or modem tones. Returns a download link (kept 7 days) and a manifest. Survives YouTube-grade AAC/Opus.
verify
verify_signature
Verify a Delta Signal audio signature at an https WAV URL: returns which hidden layers are present (found_layers) and whether the audio matches an expected message (matches: true/false, or null if no expected_message given). Cheaper than full decode — use it when you only need to confirm presence or identity.

Endpoints

URLTransportStateLatencyChecked
https://signal.daxfoundation.org/mcp streamable-http answering 310 ms 12 min ago

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Delta Signal — questions

Answers built from our own checks of this server.

What can Delta Signal do?
It exposes 5 tools, read directly from the server on our last check. Among them: decode_audio, describe_engine, preview_card, render_signature, verify_signature. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Delta Signal working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 310 ms. The bar chart above shows every period we have measured.
The registry lists Delta Signal as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect Delta Signal?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Delta Signal need an API key?
No. Delta Signal completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.