Stop signups with disposable emails.
A REST API that flags burner, temporary, and disposable email addresses in under 200ms. Drop into your signup form, your CRM enrichment, or your fraud pipeline.
1,000 requests per month free. No card required.
$ curl -H "X-API-Key: isb_live_…" \ https://api.isburner.com/v1/check/[email protected] { "email": "[email protected]", "verdict": "likely_burner", "burner_score": 92, "disposable": true, "assessment": "Known disposable provider (duck.com).", "rules": ["BLOCKLIST_HIT", "DISPOSABLE_PROVIDER"] }
70,000+
Disposable domains
blocked out of the box
<200ms
p99 response time
EU edge, no cold starts
99.9%
Uptime
live at status.isburner.com
1,000
Free checks / month
no card required
Everything you need to filter the junk.
Fast, transparent, and honest about what it can detect.
Real-time verdict
A single GET returns a verdict, score, and the rules that fired. No queues, no webhooks. Sub-200ms typical.
70k+ disposable domains
A bundled blocklist of known disposable, temporary, and burner providers — updated continuously from public sources.
MX + DNS heuristics
Beyond the blocklist: MX validity, suspicious TLDs, mask-alias patterns, and high-entropy local-parts each feed the score.
EU-hosted infrastructure
Servers in Falkenstein and Helsinki via Hetzner. Your customers' email addresses never leave the EU.
GDPR compliant
Lawful basis declared. Minimal retention. Standard contractual clauses where transfers happen. Read the GDPR statement for details.
Simple REST + JSON
One endpoint, one header, JSON in and out. Quickstart with curl in 30 seconds. SDKs not required.
Simple, predictable pricing.
Start free, upgrade when you need more throughput. Prices shown in USD· detected from US.
Free
$0/mo
1,000 requests / month · 2 API keys
- Core /v1/check endpoint
- Rate limit 30/min
- Email support
Pro
$15/mo
billed monthly
10,000 requests / month · 5 API keys
- Everything in Free
- Rate limit 120/min
- Webhook callbacks (coming soon)
- Priority support
Scale
$35/mo
billed monthly
1,000,000 requests / month · 20 API keys
- Everything in Pro
- Rate limit 600/min
- Deep-check (LLM enrichment)
- Custom webhook retries
Ready to block disposable signups?
1,000 free requests per month. No card required. Drop the API into your signup form in under five minutes.