# ToolCall, pay as you go: Email verification API

> Email verification and deliverability check without sending anything: syntax, MX records, disposable-domain detection (121k+ known domains), role-account and free-provider flags. JSON verdict with a bounce/deliverability risk level.

ToolCall's x402 pay per call plan for the email verification API costs $4.00 per 1,000 emails. We check each provider's docs for 6 fields. ToolCall's docs list 2: Address, Deliverability.
We haven't run ToolCall through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
We rank 4,337 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. This plan costs less per 1,000 emails than 28% of the 4,337 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. [StableEnrich's pay-as-you-go plan](https://datacircle.dev/validate-email-apis/stableenrich/pay-as-you-go-pay-per-request-with-x402-or-mpp-post-api-minerva-validate-emails/llms.txt) costs the least for 10,000 emails a month: $0.05.
[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), [Validemail.co](https://datacircle.dev/validate-email-apis/validemail-co/9-90-monthly-9-90-month-get-api-v1-validate/llms.txt) and [looot](https://datacircle.dev/validate-email-apis/looot/top-up/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/toolcall/pay-as-you-go
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://toolcall.click/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `GET https://toolcall.click/t/email/validate`
- API key: not needed
- Its API docs: https://toolcall.click/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#/paths/~1t~1email~1validate
- Sold by: ToolCall (https://toolcall.click?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 33%
- Address: ✓
- Deliverability: ✓

## Price

- $ per 1,000 emails: $4.00
- Per: call
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Email verification and deliverability check without sending anything: syntax, MX records, disposable-domain detection (121k+ known domains), role-account and free-provider flags. JSON verdict with a bounce/deliverability risk level.

## Data

- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: per call

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: GET
- Path: /t/email/validate

## About the plan

- Plan: x402 pay per call
- Who can get it: anyone with a wallet paying each call in USDC on Base (x402), with no account or API key

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

email address, syntax valid, MX record, disposable, role, free provider, risk level, reasons

## ToolCall's plans (1)

- [ToolCall, pay as you go](https://datacircle.dev/validate-email-apis/toolcall/pay-as-you-go/llms.txt): $4.00 per 1,000, 33% complete

## ToolCall's calls for this API (1)

- `GET /t/email/validate`: [ToolCall, pay as you go](https://datacircle.dev/validate-email-apis/toolcall/pay-as-you-go/llms.txt)

## ToolCall's APIs (7)

- [ToolCall: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: job postings API pricing, 1 plan](https://datacircle.dev/job-posting-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: local business search API pricing, 1 plan](https://datacircle.dev/local-business-search-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: news API pricing, 1 plan](https://datacircle.dev/news-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/toolcall/pay-as-you-go/llms.txt)
- [ToolCall: web search API pricing, 1 plan](https://datacircle.dev/web-search-apis/toolcall/pay-as-you-go/llms.txt)

## ToolCall: email verification API alternatives

- [Verimail, $4 pack](https://datacircle.dev/validate-email-apis/verimail/4-pack/llms.txt): $4.00 per 1,000, 50% complete, live
- [MailValid, $8 pack, Pay-as-you-go 2,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/8-pack-pay-as-you-go-2000-credits-post-api-v1-verify-bulk/llms.txt): $4.00 per 1,000, 67% complete, 30 days
- [Easy Email Verification, $200 pack, Pay-as-you-go, 50,000 emails, POST /bulk/upload](https://datacircle.dev/validate-email-apis/easy-email-verification/200-pack-pay-as-you-go-50000-emails-post-bulk-upload/llms.txt): $4.00 per 1,000, 50% complete, live
- [QuickEmailVerification, $200 pack, Persistent Credits, 50,000 credits, GET /v1/verify](https://datacircle.dev/validate-email-apis/quickemailverification/200-pack/llms.txt): $4.00 per 1,000, 50% complete, live
- [Reply.io, $20 monthly](https://datacircle.dev/validate-email-apis/reply-io/20-monthly/llms.txt): $4.00 per 1,000, 0% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-09.

- https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://toolcall.click?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://toolcall.click/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://toolcall.click/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://toolcall.click/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing