# InboxPolicy, pay as you go, Pay-per-call (x402), POST /v1/batches/verify: Email verification API

> One API call answers the question your agent is actually asking: send, review, or avoid — with confidence, evidence, and honest unknowns.

InboxPolicy's email verification API on its Pay-per-call (x402) plan. It costs $10.00 per 1,000 emails. It returns 1 of the 6 key fields we check: Deliverability.
In [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt), the best plan from InboxPolicy scores 53.2 out of 100. InboxPolicy ranks 65th of 197 providers.
Half of the 3,886 plans we rank by price cost $1.998 per 1,000 emails or less. This plan costs less per 1,000 emails than 9% of the 3,886 plans.
[treg's top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) is the cheapest paid plan per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $68.365 per 1,000 emails when no provider answers.
[Disify's $9 monthly plan (/email)](https://datacircle.dev/validate-email-apis/disify/9-monthly-starter-post-email/llms.txt) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.
[pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt), [MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt) and [Giggal](https://datacircle.dev/validate-email-apis/giggal/39-pack-50000-credits-post-v1-verify/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-post-v1-batches-verify
- [Email validation API: 190+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://inboxpolicy.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.inboxpolicy.com/v1/batches/verify`
- API key: not needed
- Its API docs: https://inboxpolicy.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#batches
- Sold by: InboxPolicy (https://inboxpolicy.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-05

## In the answer

- Completeness: 17%
- Deliverability: ✓

## Price

- $ per 1,000 emails: $10.00
- Per: result
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $10.00

## Catch-all

- $ per 1,000: $10.00

## In their words

- Their pitch: One API call answers the question your agent is actually asking: send, review, or avoid — with confidence, evidence, and honest unknowns.

## Data

- What it checks: format, mail servers, mailbox
- Keep data: no limit
- Use data: Verify addresses you have a lawful basis to process. You are the data controller for lists you submit, we process them solely to produce your results. Prohibited: using the service to enable unsolicited bulk email in violation of applicable law (CAN-SPAM, GDPR, PECR, etc.), verifying harvested or scraped lists for spam, probing our infrastructure, or reselling raw results.

## Plan

- Pay: per call
- You get: 1 credit
- Enough for: 1 result

## Rate limit

- Batch: 5,000

## Speed

- Answer: by polling or webhook

## The call

- You send: emails. Optional: strictness, webhook_url
- Method: POST
- Path: /v1/batches/verify

## About the plan

- Plan: Pay-per-call (x402)
- Who can get it: anyone

## The 8 fields the plan's answer can hold

batch ID, status, total items, processed items, valid count, invalid count, unknown count, error count

## InboxPolicy's plans (7)

- [InboxPolicy, pay as you go, Pay-per-call (x402), POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-post-v1-batches-verify/llms.txt): $10.00 per 1,000, 17% complete
- [InboxPolicy, pay as you go, Pay-per-call (x402), 20% off after 1,000 units in 30 days, POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-20-off-after-1000-units-in-30-days-post-v1-batches-verify/llms.txt): $8.00 per 1,000, 17% complete
- [InboxPolicy, pay as you go, Pay-per-call (x402), 40% off after 10,000 units in 30 days, POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-40-off-after-10000-units-in-30-days-post-v1-batches-verify/llms.txt): $6.00 per 1,000, 17% complete
- [InboxPolicy, $5 pack, Starter, POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/5-pack-starter-post-v1-batches-verify/llms.txt): $5.00 per 1,000, 17% complete, 72 hours
- [InboxPolicy, $19 pack, Builder, POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/19-pack-builder-post-v1-batches-verify/llms.txt): $3.80 per 1,000, 17% complete, 72 hours
- [InboxPolicy, $79 pack, Growth, POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/79-pack-growth-post-v1-batches-verify/llms.txt): $3.16 per 1,000, 17% complete, 72 hours
- [InboxPolicy, contact us, Volume pricing, POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/contact-us-volume-pricing-post-v1-batches-verify/llms.txt): 17% complete, 72 hours

## InboxPolicy's calls (3)

- `POST /v1/batches/verify`: [InboxPolicy, pay as you go, Pay-per-call (x402), POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-post-v1-batches-verify/llms.txt)
- `POST /v1/decide`: [InboxPolicy, pay as you go, Pay-per-call (x402), POST /v1/decide](https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-post-v1-decide/llms.txt)
- `POST /v1/verify`: [InboxPolicy, pay as you go, Pay-per-call (x402), POST /v1/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-post-v1-verify/llms.txt)

## InboxPolicy's APIs (1)

- [InboxPolicy: email verification API pricing, 7 plans, POST /v1/batches/verify](https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-post-v1-batches-verify/llms.txt)

## InboxPolicy: email verification API alternatives

- [Tuski, pay as you go](https://datacircle.dev/validate-email-apis/tuski/pay-as-you-go/llms.txt): $10.00 per 1,000, 50% complete
- [Catch-all Verifier, $25 pack, 2,500 Credits, POST /api/v1/verify/single](https://datacircle.dev/validate-email-apis/catch-all-verifier/25-pack-2500-credits-post-api-v1-verify-single/llms.txt): $10.00 per 1,000, 33% complete, live
- [Clearout, $1,000 pack, 500,000 credits, POST /email_verify/instant, Instant Verify, full](https://datacircle.dev/validate-email-apis/clearout/1000-pack-500000-credits-post-email-verify-instant-instant-verify-full/llms.txt): $10.00 per 1,000, 50% complete, live
- [SyncGTM, $50 pack](https://datacircle.dev/validate-email-apis/syncgtm/50-pack/llms.txt): $10.00 per 1,000, 33% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-05.

- https://api.inboxpolicy.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://inboxpolicy.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://inboxpolicy.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://inboxpolicy.com/free-plan?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://inboxpolicy.com/guides/bulk-email-verification-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://inboxpolicy.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://inboxpolicy.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://inboxpolicy.com/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://inboxpolicy.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing