Fulcrum API

curl -X POST https://api.fulcrumgo.com/api/v1/enrich-lead \
  -H "Authorization: Bearer mcpsk_<your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{
  "domain": "",
  "model": "claude-haiku-4-5-20251001"
}'

Add this server to Claude Desktop's claude_desktop_config.json. The endpoint becomes a callable tool inside Claude. See the MCP setup guide for the full walk-through.

{
  "mcpServers": {
    "this-api": {
      "url": "https://api.fulcrumgo.com/mcp",
      "transport": "http",
      "auth": {
        "type": "bearer",
        "token": "mcpsk_<your_api_key>"
      }
    }
  }
}

Inside Claude this endpoint surfaces as the tool enrich-lead.

Standard requests — no custom SDK needed. pip install requests first.

import requests

r = requests.post(
    "https://api.fulcrumgo.com/api/v1/enrich-lead",
    headers={"Authorization": "Bearer mcpsk_<your_api_key>"},
    json={
  "domain": "",
  "model": "claude-haiku-4-5-20251001"
},
)
r.raise_for_status()
print(r.json())

Plain fetch. Works in Node 18+, Deno, Bun, and any modern browser.

const r = await fetch("https://api.fulcrumgo.com/api/v1/enrich-lead", {
  method: "POST",
  headers: {
    "Authorization": "Bearer mcpsk_<your_api_key>",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
  "domain": "",
  "model": "claude-haiku-4-5-20251001"
}),
});
if (!r.ok) throw new Error(`HTTP ${r.status}`);
console.log(await r.json());

Input

Field	Type	Required	Default	Description
domain	string	required	—	Bare store domain, e.g. 'examplestore.com'. No scheme, no path. maxLength=253
model	string	optional	claude-haiku-4-5-20251001	Anthropic model slug. Haiku is the tuned default. maxLength=100

Output

Field	Type	Required	Default	Description
domain	string	required	—
icebreaker	string	required	—
subject	string	required	—
homepage_found	boolean	required	—	False when the homepage could not be read. The pair is still written from the domain alone, so treat it as lower confidence.

Try it

Fires a real POST /api/v1/enrich-lead from your browser. Charges 1 credit per call against your account.