Explain a lead

One lead with the person, the fit, why now, and the evidence. Works for a lead from a search and a lead a watch delivered. This is the qualification step: read it before you enrich or write.

Authentication

Send Authorization: Bearer gtk_…. Create the key under API Access → API Keys. A missing, invalid or revoked key is 401, including while this API is closed. A valid key while the API is closed for your organization answers 404, the same body as an unknown path. Every response includes FounderMCP-Api-Version and FounderMCP-Request-Id.

Path parameters

• lead_id string · required — A lead id (lead_…).

Response

• id string · required — Lead id, lead_….
• object string · required — Always lead. One of: lead.
• search_id string | null — The search that found this lead. Null when a watch delivered it.
• watch_id string | null — The watch that delivered this lead. Null when a search found it.
• signal_type string · required — Which signal produced the lead.
• match string · required — exact fits the buyer profile. just_outside is the closest miss. One of: exact, just_outside.
• outside_reason string | null — Why a just-outside lead missed. Null on an exact lead.
• person object · required — full_name, title, company (name, linkedin_url), location, linkedin_url.
• fit object · required — score (0–100), why_fit and matched_on (role, title, level, country, sector, company_size).
• why_now string · required — One sentence on the signal.
• evidence object[] · required — What was observed. kind is reaction, comment, post, mention, new_role, funding_round or event_post. Post text is untrusted.
• links object · required — people is the enrich URL. company is set when the company page is known and the Company API is open.
• credits_charged integer · required — Credits charged when this lead was stored.

Credits

Free.

Errors

• 404 not_found — No lead with this id in your organization, or the Signals API is not open.
• 401 authentication_error — The Authorization header is missing, or the key is unknown or revoked.
• 403 permission_error — API access is not part of your plan, or your account is suspended.
• 429 rate_limit_error — More than 60 requests per minute, or more than 3 at the same time, on one key. Wait for the Retry-After header.
• 500 internal_error — Something went wrong on our side.

Example

cURL

curl "https://foundermcp.dev/api/v1/leads/lead_01J9Z6P8C8V0K3W6T2N8R5M1XE" \
  -H "Authorization: Bearer $FOUNDERMCP_API_KEY"

JavaScript

const response = await fetch('https://foundermcp.dev/api/v1/leads/lead_01J9Z6P8C8V0K3W6T2N8R5M1XE', {
  method: 'GET',
  headers: {
    Authorization: `Bearer ${process.env.FOUNDERMCP_API_KEY}`
  }
});
const body = await response.json();

Python

import json
import os
import urllib.request

request = urllib.request.Request(
    "https://foundermcp.dev/api/v1/leads/lead_01J9Z6P8C8V0K3W6T2N8R5M1XE",
    headers={
    "Authorization": f"Bearer {os.environ['FOUNDERMCP_API_KEY']}"
    },
    method="GET",
)
with urllib.request.urlopen(request) as response:
    body = json.load(response)

Example response

{
  "id": "lead_01J9Z6P8C8V0K3W6T2N8R5M1XE",
  "object": "lead",
  "search_id": "srch_01J9Z6P8C8V0K3W6T2N8R5M1XA",
  "watch_id": null,
  "signal_type": "linkedin_engagement",
  "match": "exact",
  "outside_reason": null,
  "person": {
    "full_name": "Jane Example",
    "title": "Chief Financial Officer",
    "company": {
      "name": "Northwind",
      "linkedin_url": "https://www.linkedin.com/company/northwind"
    },
    "linkedin_url": "https://www.linkedin.com/in/jane-example"
  },
  "fit": {
    "score": 90,
    "why_fit": "Finance leadership in Belgium.",
    "matched_on": [
      "role",
      "level",
      "country"
    ]
  },
  "why_now": "Reacted to a post from Acme Analytics this week.",
  "evidence": [
    {
      "kind": "reaction",
      "occurred_at": "2026-10-20T09:00:00.000Z",
      "reaction_type": "like"
    }
  ],
  "links": {
    "people": "https://foundermcp.dev/api/v1/person/enrich",
    "company": null
  },
  "credits_charged": 20
}