Is that email real?

A single API call tells you if an email is disposable, temporary, or from a spam domain. Built for SaaS sign-ups, fraud prevention, and AI agents.

curl

      // One call. One answer.

      GET https://api.isburner.com/v1/check/[email protected]

→ Response · 12ms

{
  "email": "[email protected]",
  "disposable": true,
  "spam_score": 0.91,
  "domain_age_days": 14,
  "mx_valid": false,
  "reason": "known_disposable + no_mx"
}

⚡

Sub-20ms Response

In-memory blocklist with 30k+ domains. No database round-trips. Edge-deployed for speed.

🔬

Deep Spam Analysis

Beyond blocklists — checks MX records, domain age, catch-all detection, and local-part entropy scoring.

🤖

AI Agent Ready

OpenAPI spec + MCP server endpoint. Works natively with OpenClaw, LangChain, and any agent framework.

🔑

Dead Simple Auth

One API key. One endpoint. No SDKs required. Works with curl, fetch, or any HTTP client.

Generous free tier. Predictable pricing.

10,000 checks/month free — then simple per-check pricing with no surprises.