Nose for Leads — MCP server

Verified local-business leads, built for agents.

Nose for Leads is an MCP server that finds, filters, and verifies local-business leads on demand: agents get back a send-ready list of contacts, not raw scrape data. Every email carries a machine-readable verification receipt (verifier, verdict, timestamp) so an agent can act on it without a human double-checking. Access is credit-based with per-key spend budgets and daily caps, so an agent can be handed a key without a blank check.

• Endpoint: https://api.noseforleads.com/mcp (streamable HTTP; OAuth 2.1 with dynamic client registration, or an X-API-Key header)

• Website: https://www.noseforleads.com/mcp-server-local-business-leads

• Full agent guide: https://www.noseforleads.com/agents.md

• OpenAPI (REST surface): https://api.noseforleads.com/openapi.json

• Sign up (25 free validated leads): https://app.noseforleads.com/signup

This repository holds the public integration docs, the registry manifest (server.json), and example transcripts. The server itself is remote-hosted; there is nothing to install or self-host.

Connect

Claude Code (OAuth, no key to paste)

claude mcp add --transport http nose-for-leads https://api.noseforleads.com/mcp
claude mcp login nose-for-leads

login opens your browser to approve access and set a spending budget. The token persists across sessions and refreshes itself.

Codex CLI

# ~/.codex/config.toml
[mcp_servers.nose-for-leads]
url = "https://api.noseforleads.com/mcp"

codex mcp login nose-for-leads

If OAuth gives you trouble, the API-key header works in Codex too: env_http_headers = { "X-API-Key" = "YOUR_ENV_VAR" } under the same block.

Cursor, Windsurf, other MCP clients

Point your client's HTTP server config at https://api.noseforleads.com/mcp. Cursor's .cursor/mcp.json (and any client that reads the standard shape):

{
  "mcpServers": {
    "nose-for-leads": { "type": "http", "url": "https://api.noseforleads.com/mcp" }
  }
}

API key (scripts, CI, clients without OAuth)

Mint a key at https://app.noseforleads.com/keys and pass it as a header: X-API-Key: <your key> (or Authorization: Bearer <your key>). Keys can carry a total and/or daily credit budget, so a runaway loop stops at the cap with a budget_exhausted error instead of draining the account.

Related MCP server: Prospeo MCP Server

Tools

All 9 tools carry MCP tool annotations (readOnly / destructive / idempotent / openWorld) and require the auth above.

Verification receipts

Rows returned by fetch_results carry a receipt when a live verification exists: verified_by (which verifier), verified_at (when), and verifier_verdict (the result). A receipt proves the email was checked against the live mailbox provider, not merely pattern-matched. See examples/ for real transcript shapes.

Credits and safety semantics

• 1 credit = 1 validated lead; 25 free at signup, prepaid packs from $19.99 for 200.

• A campaign that discovers more leads than the balance covers delivers what the credits cover and ends done_partial instead of failing.

• Per-key budgets are enforced before the account balance, and start_campaign honors idempotency_key, so a retry never double-charges.

• Errors return a plain {code, message} envelope (e.g. payment_required, budget_exhausted, quota_exceeded with retry_after). The full table is in the agent guide.