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SIGNL4 MCP by usefulapi

io.usefulapi/signl4 · signl4.usefulapi.io · MCP, Website

Read SIGNL4 alerts, teams, users and duty schedules; raise, acknowledge, close and annotate alerts.
Name and description as published by MCP Registry

Live

Last successful check: 26 Oct 2026, 22:36 UTC.

answered, last 24 hours
100%
answered, last 30 days
100%

At signl4.usefulapi.io, its best endpoint.

How addrbook checks →

Evidence

3 of 4 shown

  1. Answers when askedShown

    Answered a check 10 hours ago.

  2. Owner provenShown

    Control proven: usefulapi.io, proven to the MCP Registry.

  3. Track recordNot shown

    Listed for 1 days; 30 are needed.

  4. Independent paying walletsDoes not apply

    It does not sell over x402.

  5. Tool scanShown

    No hidden instructions or invisible characters in its 18 tools.

Decided by method 2026.10.2, from its recorded evidence. A check that does not apply is left out of the count.

Connect

https://signl4.usefulapi.io/mcphttps://usefulapi.io/signl4/

MCP: addrbook sends an initialize and a tools/list. It never calls a tool. Website: addrbook loads the page.

Who's behind it

Listed by
  • MCP Registryio.usefulapi/signl4last seen UTC
Wallets named
None in its listings
Proven to belong to it
  • usefulapi.iothe MCP Registry checked its publisher's namespace,
Listed since

Payments

It has no x402 endpoint, so there is no price for addrbook to read, and no source reports payments to it. How payments are read

Checks by endpoint

HostProtocolStateLast checked (UTC)Last answered (UTC)24 hours30 daysTools
signl4.usefulapi.ioMCPLive100%100%18
usefulapi.ioWebsiteLive100%100%—

Tool scan

addrbook read the descriptions of 18 tools at signl4.usefulapi.io on and found nothing to flag. It reads what the tools say about themselves; it never calls one. The recorded scan

History

  1. The MCP Registry updated its listing.the MCP Registry#443309
  2. First recorded as answering.https://usefulapi.io/signl4/#301624
  3. Tool scan: no hidden instructions or invisible characters.https://signl4.usefulapi.io/mcp#301581
  4. Tool list first read: 18 tools.https://signl4.usefulapi.io/mcp#301580
  5. First recorded as answering.https://signl4.usefulapi.io/mcp#301579
  6. Listed by the MCP Registry. (already true when recording began)the MCP Registry#56815

Its whole history →

Is it yours?

Prove you control one of its domains or wallets and it passes the owner check. You can then reply beside the evidence. Claim this agent

Its evidence badge, for a README or a site. It shows the same count as this page, never a verdict.

addrbook evidence badge for SIGNL4 MCP by usefulapi
[![addrbook evidence](https://api.addrbook.com/v1/agents/signl4-mcp-by-usefulapi-31b81a2a/badge.svg)](https://addrbook.com/agents/signl4-mcp-by-usefulapi-31b81a2a)