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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 2026-10-13).
Verifies a batch of email addresses and returns a send/review/avoid decision with supporting evidence for each address.
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 batch_id, queued status, total item count, amount charged in USD, and a keyless access_token used to poll for results via the x-batch-access-token header. Once processing completes, each email receives a send/review/avoid decision with supporting evidence.
Example use cases
Pre-campaign email list hygiene
“I have a list of 1,500 email addresses I'm about to send a product launch campaign to — can you verify all of them and flag which ones I should send to, which to review, and which to skip entirely?”
Sales outreach list cleanup
“Before my SDR team starts their cold outreach next week, I need to verify these 300 prospect emails and get a clear send-or-avoid decision on each one so we don't burn our domain reputation.”
Automated sign-up validation pipeline
“We just exported 800 new user sign-up emails from the past month — run verification on all of them with strict settings and let me know which are safe to add to our mailing list.”
Technical details
Endpoint
POSThttps://api.inboxpolicy.com/v1/batches/verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need an actionable send/review/avoid decision on email addresses — not just a syntax check — and want evidence-backed results at scale (up to 5000 per call) with no account or API key required. Ideal for pre-campaign list cleaning, cold outreach hygiene, or automated sign-up validation pipelines where pay-per-use at $0.01/address fits better than a subscription.
Side effects
- Invalid or malformed email addresses in input array may cause partial failures or skipped entries
- Batch size exceeding 5000 addresses will be rejected
- Payment failure via x402 will prevent batch from being processed
- Webhook URL misconfiguration may cause silent completion notification failures
- Polling with an incorrect or expired access_token will return unauthorized errors
- Network timeout on large batches requiring extended polling
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emailsrequired | array | Up to 5000 addresses; total price is count x the per-email rate. |
| strictness | string | |
| webhook_url | string | Optional signed completion webhook. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| statusrequired | string | |
| batch_idrequired | string | |
| amount_usd | number | |
| total_itemsrequired | integer | |
| access_tokenrequired | string | Keyless polling credential; send as x-batch-access-token. |
Tags
x402
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