FreeCustom.Email is a robust and developer-friendly Temporary Email and OTP Testing API designed specifically for automating signup, authentication, and email-based workflows.
With this API, you can effortlessly create inboxes on demand, receive emails in real-time, and programmatically extract verification codes or links. This functionality makes it ideal for testing authentication flows, continuous integration (CI) pipelines, and automation systems.
Common use cases include:
The FreeCustom.Email API is straightforward to integrate, making it perfect for developers building automation tools, quality assurance (QA) pipelines, or multi-account testing systems.
This marketplace version provides a simplified API experience tailored for quick implementations.
For access to the full capabilities, enhanced performance, and advanced features, consider using the direct API on our platform.
Our direct API offers additional features and superior performance, including:
FreeCustom.Email is specifically designed for developers who require reliable email infrastructure for testing and automation, with an emphasis on performance, simplicity, and real-world debugging capabilities.
{"success":true,"data":[{"domain":"ditapi.info","tier":"free","tags":[]},{"domain":"ditcloud.info","tier":"free","tags":[]},{"domain":"ditdrive.info","tier":"free","tags":[]},{"domain":"ditgame.info","tier":"free","tags":[]},{"domain":"ditlearn.info","tier":"free","tags":[]},{"domain":"ditpay.info","tier":"free","tags":[]},{"domain":"ditplay.info","tier":"free","tags":["popular"]},{"domain":"ditube.info","tier":"free","tags":["popular"]},{"domain":"junkstopper.info","tier":"free","tags":[]},{"domain":"areueally.info","tier":"free","tags":[]},{"domain":"addmy.space","tier":"free","tags":["new"]},{"domain":"attachmy.site","tier":"free","tags":["new"]}],"count":12,"note":"Upgrade to Growth plan to access additional pro domains."}
curl --location --request GET 'https://zylalabs.com/api/12433/freecustomemail+-+temp+email+and+otp+testing+api/23570/get+domains' --header 'Authorization: Bearer YOUR_API_KEY'
{"success":true,"message":"Mailbox retrieved successfully.","data":[{"id":"F7LpBSaAuG","from":"\"xAI\" <[email protected]>","to":"[email protected]","subject":"S3G-9PC xAI confirmation code","date":"2026-04-27T16:03:32.078Z","hasAttachment":false,"wasAttachmentStripped":false,"otp":"__DETECTED__","verificationLink":null},{"id":"B49mzFMnvx","from":"\"SendTestEmail\" <[email protected]>","to":"[email protected]","subject":"SendTestEmail.com - Testing Email ID: 808e9ed8a9d764cf7e918e536f7a8836","date":"2026-04-27T16:03:11.625Z","hasAttachment":false,"wasAttachmentStripped":false,"otp":null,"verificationLink":null}],"encryptedMailbox":"D-6ffejiz1jxh13cxkur"}
curl --location --request GET 'https://zylalabs.com/api/12433/freecustomemail+-+temp+email+and+otp+testing+api/23571/get+mailbox+messages&email=Required' --header 'Authorization: Bearer YOUR_API_KEY'
Get messages with id from mailbox name.
{"success":true,"message":"Message retrieved successfully.","data":{"id":"TWqYmjH-Ma","from":"\"SendTestEmail\" <[email protected]>","to":"[email protected]","subject":"SendTestEmail.com - Testing Email ID: fbe5dcfe22549d34c858582ea12d7d9b","date":"2026-04-27T06:02:03.785Z","hasAttachment":false,"wasAttachmentStripped":false,"html":"<html>\nCongratulations!<br><br>\nIf you are reading this your email address is working.<br><br>\nThis is not spam or a solicitation. This email was sent to your email address because you, or someone else, requested a test email to be sent to this address. We work hard to ensure a balance between testing, transparency, and privacy. If you did not request this email test, it's likely that someone accidentally mistyped their email address as yours. You can request your email address be blocked here: <a href=\"https://sendtestemail.com/block\">https://sendtestemail.com/block</a><br><br>\nThe IP address of the requester of this test email is: 103.175.29.77\n</html>","text":"If you are reading this your email address is working.\n\n\nThis is not spam or a solicitation. This email was sent to your email address because you, or someone else, requested a test email to be sent to this address. We work hard to ensure a balance between testing, transparency, and privacy. If you did not request this email test, it's likely that someone accidentally mistyped their email address as yours. You can request your email address be blocked here: https://sendtestemail.com/block\n\n\nThe IP address of the requester of this test email is: 103.175.29.77","attachments":[],"otp":null,"otpScore":null,"verificationLink":null}}
curl --location --request GET 'https://zylalabs.com/api/12433/freecustomemail+-+temp+email+and+otp+testing+api/23572/get+full+message&email=Required&/message/=Required&id=Required' --header 'Authorization: Bearer YOUR_API_KEY'
Delete a message with its id from mailbox name.
{"success":false,"message":"Message not found or already deleted."}
curl --location --request DELETE 'https://zylalabs.com/api/12433/freecustomemail+-+temp+email+and+otp+testing+api/23573/delete+a+message&email=Required&/message/=Required&id=Required' --header 'Authorization: Bearer YOUR_API_KEY'
Get details about number of queued and denied mailboxes.
{"success":true,"message":"Stats retrieved successfully.","data":{"queued":2997900,"denied":122209}}
curl --location --request GET 'https://zylalabs.com/api/12433/freecustomemail+-+temp+email+and+otp+testing+api/23574/get+health+and+stats' --header 'Authorization: Bearer YOUR_API_KEY'
| Header | Description |
|---|---|
Authorization
|
[Required] Should be Bearer access_key. See "Your API Access Key" above when you are subscribed. |
No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.
The primary function of the FreeCustom.Email API is to generate temporary email addresses for online registration and OTP testing, allowing users to receive one-time passwords and verification emails securely and anonymously.
Developers can use the FreeCustom.Email API to create disposable email accounts that can receive verification emails during the signup process, enabling them to test the entire flow without using personal email addresses.
The API can extract one-time passwords (OTPs), verification links, and other relevant information from incoming emails in real-time.
Yes, the FreeCustom.Email API is specifically designed to handle OTP-based authentication by allowing users to receive and extract OTPs from emails.
Common use cases include testing signup and login flows, handling OTP-based authentication, verifying password reset emails, and running end-to-end tests using automation tools.
The API supports standard email formats, allowing users to receive and parse emails in plain text or HTML.
The FreeCustom.Email API provides real-time inbox updates, allowing users to receive emails instantly as they arrive.
The benefits include enhanced privacy, reduced spam, simplified testing of email workflows, and the ability to automate email-based processes without using personal email accounts.
Yes, the direct API version supports attachment handling, allowing users to receive emails with attachments.
The core value proposition is to provide a reliable and user-friendly solution for generating temporary email addresses, enhancing privacy, and facilitating seamless testing of email workflows.
The API can be integrated into CI pipelines by automating the creation of temporary email accounts and extracting verification codes during automated tests.
The API returns data fields such as sender, subject, body, timestamp, and any extracted OTPs or links from the email.
Yes, the FreeCustom.Email API is ideal for use with testing frameworks like Playwright or Cypress for running end-to-end tests involving email verification.
The API is designed for developers with a focus on performance, simplicity, and reliable email infrastructure for testing and automation.
The API utilizes stable domains and optimized delivery mechanisms to ensure higher deliverability rates for incoming emails.
The direct API version offers features like automatic OTP extraction, verification link extraction, attachment support, and faster email delivery.
By providing temporary email addresses, the API allows users to bypass spam and protect their personal email addresses from exposure.
Users can create a temporary email address by making a simple API call, which generates a unique inbox for receiving emails.
Yes, the API can be used to receive and verify password reset emails, making it easier to test this functionality.
The "获取域名" endpoint returns a list of available free domains for creating temporary email addresses. The response includes each domain's name, tier, and any associated tags.
The response includes fields such as "id," "from," "to," "subject," "date," "hasAttachment," and "otp." These fields provide essential details about each email message retrieved.
The response data is structured in a JSON format, containing a success status, a message, and a "data" object that includes detailed information about the specific email, such as sender, subject, and content.
The "删除消息" endpoint requires the "id" parameter, which specifies the unique identifier of the message to be deleted from the inbox.
This endpoint provides statistics on the number of queued and denied emails, offering insights into the email processing status and potential issues with delivery.
Users can parse the returned data to extract relevant information, such as OTPs or verification links, enabling automated testing of email workflows and authentication processes.
Typical use cases include retrieving detailed information about specific emails for debugging, verifying email content during tests, and extracting links or OTPs for automated processes.
The API employs mechanisms to ensure reliable email delivery and accurate data retrieval, including monitoring email processing and maintaining stable domains to enhance deliverability rates.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
Service Level:
100%
Response Time:
358ms
Service Level:
100%
Response Time:
167ms
Service Level:
100%
Response Time:
331ms
Service Level:
100%
Response Time:
432ms
Service Level:
100%
Response Time:
116ms
Service Level:
100%
Response Time:
197ms
Service Level:
100%
Response Time:
2,205ms
Service Level:
100%
Response Time:
819ms
Service Level:
100%
Response Time:
283ms
Service Level:
100%
Response Time:
344ms