Sleuth Intel API Key Authentication and Error Codes

Every request to the Sleuth Intel API must include your API key in the Authorization header. Your key is tied to your account tier, so the endpoints and rate limits available to you reflect your current subscription.

Get Your API Key

Sign in at sleuthintel.io.
Open Account Settings.
Copy your API key from the API section.

Your API key is scoped to your account tier. Endpoints and rate limits are determined by the plan associated with your key — not by any per-request parameter.

Pass the Key in Your Request

Include your key as a Bearer token in the Authorization header on every request:

Authorization: Bearer YOUR_API_KEY

Never commit your API key to source control. Treat it like a password — if it is exposed, regenerate it immediately from Account Settings.

Store your key in an environment variable such as SLEUTH_API_KEY and read it at runtime. This keeps it out of your codebase and makes key rotation straightforward.

Code Examples

curl https://api.sleuthintel.io/v1/signals \
  -H "Authorization: Bearer YOUR_API_KEY"

const response = await fetch("https://api.sleuthintel.io/v1/signals", {
  headers: {
    Authorization: `Bearer ${process.env.SLEUTH_API_KEY}`,
  },
});

const data = await response.json();
console.log(data);

import os
import requests

headers = {
    "Authorization": f"Bearer {os.environ['SLEUTH_API_KEY']}"
}

response = requests.get("https://api.sleuthintel.io/v1/signals", headers=headers)
data = response.json()
print(data)

Error Reference

Status Code	Meaning	Resolution
`401 Unauthorized`	API key is missing or invalid	Check that your key is correct and included in every request
`403 Forbidden`	Your tier does not include this endpoint	Upgrade your subscription to unlock higher-tier endpoints
`429 Too Many Requests`	You have exceeded your rate limit	Back off and retry after the window resets; upgrade for higher limits
`500 Internal Server Error`	Unexpected server-side error	Retry with exponential backoff; contact support if it persists

401 — Missing or Invalid Key

{
  "error": "unauthorized",
  "message": "Invalid or missing API key."
}

403 — Tier Restriction

{
  "error": "forbidden",
  "message": "This endpoint is not available on your current plan."
}

429 — Rate Limited

{
  "error": "rate_limit_exceeded",
  "message": "You have exceeded your request limit. Please wait before retrying."
}

API Reference

MCP Integration

Agent Economy

Sleuth Intel API Key Authentication and Error Codes

Get Your API Key

Pass the Key in Your Request

Code Examples

Error Reference

401 — Missing or Invalid Key

403 — Tier Restriction

429 — Rate Limited

​Get Your API Key

​Pass the Key in Your Request

​Code Examples

​Error Reference

​401 — Missing or Invalid Key

​403 — Tier Restriction

​429 — Rate Limited

Get Your API Key

Pass the Key in Your Request

Code Examples

Error Reference

401 — Missing or Invalid Key

403 — Tier Restriction

429 — Rate Limited