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Account & Quota
Free Plan
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100
Validation Credits
10 RPS
Rate Limit
<30ms
Edge Latency
API Key Management
Pass header X-API-Key: cs_live_... or query parameter ?key=... in API requests.
cs_live_default
Live Validation Simulator
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Quick Integration (<30ms)
curl -X POST https://api.checksignup.com/validate \
-H "Content-Type: application/json" \
-H "X-API-Key: cs_live_default" \
-d '{"email": "customer@example.com"}'
⚡ Returns JSON response with Canonical Normalization, dots/alias stripping, 75k+ disposable domain check, and DoH MX records.