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InboxPolicy Send-Decision Email Verification API
x402
InboxPolicy Send-Decision Email Verification API is a paid API for AI agents from api.inboxpolicy.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).
Verifies an email address and returns an actionable send decision (send, review, or avoid) with confidence score and deliverability signals
Price / call$0.01
Success—
StatusUnknown
How this service works
Email verification API that returns a decision — send, review, or avoid — with evidence. $0.01/call via x402, no account. Free 72h re-verification.
Output
Returns a JSON object with an 'action' enum (send, send_with_caution, review, retry_later, or avoid), a confidence score (0–100), a validity status (valid, invalid, unknown, temporary_unavailable, syntax_error), a human-readable reason, boolean signals (disposable, catch_all, free, role_account), a cache flag, and a unique request ID. Billing metadata indicates whether the call was charged.
Example use cases
Pre-send list hygiene check
“Before I send this newsletter, verify whether sarah.johnson@acmecorp.com is safe to contact — give me the send decision and flag if it's a disposable or catch-all address.”
New user signup email screening
“A user just signed up with the email temp123@mailinator.com — can you run it through InboxPolicy and tell me if I should allow the account or mark it for review?”
Force-refresh stale verification
“We checked dev-team@bigclient.org last week but I want a fresh verification today — bypass the cache and tell me the current send decision and confidence score.”
Technical details
Endpoint
POSThttps://api.inboxpolicy.com/v1/decide?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need an actionable send/avoid decision rather than just a syntactic validity check — it performs live SMTP and domain checks with disposable, catch-all, and role-account signals. Ideal for pre-send list hygiene, signup screening, or CRM enrichment where a binary valid/invalid result is insufficient. The $0.01/call micropayment via x402 requires no account signup, making it suitable for agent workflows that need on-demand verification without API key management. The 72-hour cache keeps repeated checks free.
Side effects
- Invalid or malformed email syntax returns status 'syntax_error' with action 'avoid'
- Temporary DNS or SMTP lookup failures return status 'temporary_unavailable' with action 'retry_later'
- Payment failure via x402 results in a 402 response before verification is attempted
- Rate limiting or network errors return HTTP 4xx/5xx without a verification result
- Unknown domains with catch-all servers may return low-confidence results with action 'review'
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emailrequired | string | Address to evaluate. |
| strictness | string | |
| force_refresh | boolean | Bypass the 72h verification cache. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| cost | object | |
| actionrequired | string | |
| reason | string | |
| statusrequired | string | |
| signals | object | |
| confidencerequired | integer | |
| from_cache | boolean | |
| request_id | string |
Tags
x402
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