Signal Layer

Machine-native decision and data tools for autonomous agents, with free routing and x402 USDC pay-per-call on Base.

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What it can do

  • Signal Layer Router: Free deterministic SignalLayer task router. USE THIS when the task is known but the correct SignalLayer primitive is not. Returns either no_match or one recommended tool with pric
  • Signal Layer Catalog: Free machine-readable SignalLayer capability catalog. Use this to enumerate all SignalLayer tools and prices. If the correct tool is uncertain, prefer signal_layer_router.
  • Agent Preflight: Before paying, transferring to, or interacting with an unfamiliar machine resource, x402 endpoint, recipient, or Base address. Do NOT use when: You only need market execution conditio

What data it sees

Do you need an account

No: the server works without sign-in

Machine-native decision and data tools for autonomous agents, with free routing and x402 USDC pay-per-call on Base.

How to connect

How to connect Signal Layer to Claude

The server address to paste into Claude settings:

https://signallayer--xavierleterrible.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Signal Layer to ChatGPT

The server address to paste into ChatGPT settings:

https://signallayer--xavierleterrible.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Signal Layer to Cursor

The server address to paste into Cursor settings:

https://signallayer--xavierleterrible.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (5)

Raw names from tools/list. Only developers need these.

signal_layer_routerFree deterministic SignalLayer task router. USE THIS when the task is known but the correct SignalLayer primitive is not. Returns either no_match or one recommended tool with price, missing inputs, and ready-to-call HTTP and MCP arguments. It never forces a paid recommendation.
signal_layer_catalogFree machine-readable SignalLayer capability catalog. Use this to enumerate all SignalLayer tools and prices. If the correct tool is uncertain, prefer signal_layer_router.
agent_preflightBefore paying, transferring to, or interacting with an unfamiliar machine resource, x402 endpoint, recipient, or Base address. Do NOT use when: You only need market execution conditions or webpage extraction. Price: $0.01 USDC via x402. If uncertain which SignalLayer primitive matches the task, call signal_layer_router first for free.
market_execution_intelBefore an exact-in ERC-20 swap on Base when current quote-derived execution conditions, network cost, and size sensitivity matter. Do NOT use when: You need generic historical prices, personalized investment advice, or a signed transaction. Price: $0.03 USDC via x402. If uncertain which SignalLayer primitive matches the task, call signal_layer_router first for free.
structured_extractWhen requested facts exist on a public webpage but compact structured JSON is needed instead of browsing and parsing the page. Do NOT use when: The source is already structured or the task is generic web search. Price: $0.02 USDC via x402. If uncertain which SignalLayer primitive matches the task, call signal_layer_router first for free.