402Signal

blockers

402signal.com

Fail-closed x402 router. Authorize $0.003 USDC; live eligible routes settle, normal misses cost $0.

https://402signal.com/mcp/v0.3.1WebsiteUnknownMCP 2025-06-18v0.5.0last checked 12 Oct 2026spoke MCP on 63.3% of 90 checks (30 days)initialize in 233 ms

How to authenticate

Checked against the endpoint by our probe on 12 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	Unknown
Protected-resource metadata	✕Not found Without it a client has to guess where the authorization server lives.
Anonymous access	Refused — credentials required

What the probe found

blockerCould not reach the endpoint

error sending request for url (https://402signal.com/mcp/v0.3.1)

Tools

checkpreviewvalidate

Contract history

30 Sep 2026v0.5.01 breaking

Breaking: check

17 Sep 2026v0.5.03 breaking

Breaking: check, preview, validate

14 Sep 2026v0.5.02 compatible

14 Sep 2026v0.5.04 breakinginstructions rewritten

Breaking: check, preview, route, validate

Instructions rewritten: check, preview, validate. The description an agent follows changed; the callable contract may not have.

13 Sep 2026v0.5.03 breaking1 compatibleinstructions rewritten

Breaking: preview, route, validate

Instructions rewritten: route. The description an agent follows changed; the callable contract may not have.

13 Sep 2026v0.5.03 cosmeticinstructions rewritten

Instructions rewritten: preview, route, validate. The description an agent follows changed; the callable contract may not have.

12 Sep 2026v0.5.03 breakinginstructions rewritten

Breaking: preview, route, validate

Instructions rewritten: preview, route, validate. The description an agent follows changed; the callable contract may not have.

9 Sep 2026v0.5.02 cosmetic

8 Sep 2026v0.5.03 cosmeticinstructions rewritten

Instructions rewritten: preview, route, validate. The description an agent follows changed; the callable contract may not have.

7 Sep 2026v0.5.03 breaking

Breaking: preview, route, validate

6 Sep 2026v0.5.0no contract changes

5 Sep 2026v0.5.01 cosmeticinstructions rewritten

Instructions rewritten: route. The description an agent follows changed; the callable contract may not have.

5 Sep 2026v0.5.0first recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/io-github-402signalhq-402signal/badge.svg)](https://mcpi.app/servers/io-github-402signalhq-402signal)