Email validation API

Fiber AI, free, Cardless API trial

Fiber AI's site llms.txt

$0.00per 1,000 emails

Plan: Cardless API trial one of Fiber AI's 10 plans

Call: POST /v1/validate-email/single Fiber AI's only call

POST /v1/validate-email/singleFree, Cardless API trial$0.00 per 1,000

About this item

Live. The call checks the email when you make it.
Nothing to pay. You get 100 credits, enough for 100 calls, once. Unused credits expire: when the 7 days pass without a card, the trial ends.
One call. You send email to POST /v1/validate-email/single. The call returns whether the address takes mail.
Who can get it: with conditions. Keep data: with conditions. Use data: with conditions.

Compare with similar plans

Other providers' plans with the closest prices per 1,000. Like this plan, each is live.

	This planFiber AI, free, Cardless API trial	Airscale, free	Anymail Finder, free	BetterEnrich, free, 100 credits free, POST /api/v1/verify-catch-all-email	Bouncer, free, 100 free credits, POST /v1.1/email/verify/batch
$ per 1,000	$0.00	$0.00	$0.00	$0.00	$0.00
Billing	free	free	free	free	free
Pay	$0	$0	$0	$0	$0
Enough for	100 calls, once	not published	500 calls, once	500 calls, once	100 results, once
Freshness	live	live	live	live	live
Who can get it	anyone with a work email, one trial per company domain, to use only in the United States	anyone 18 or over	businesses only, once per person, on picking a monthly plan with a card checked but not charged, subject to fraud checks	anyone, for lawful business purposes only	anyone 18 or over with a work email, a private one (Gmail, Hotmail) only after writing to Bouncer first

Sources

From each provider's own pricing page and docs. We read this row from these pages on 2026-10-17.

Product details

We list each column of this plan's row on the sheet that has a value.

Price
$ per 1,000	$0.00
Billing	free

Charges
Per	call

Not found
$ per 1,000	$0.00

Catch-all
$ per 1,000	$0.00

In their words
Their pitch	Email validation tells you whether an address will bounce before you send to it. Send one email, we return a verdict, a deliverability score out of 100, and flags for catch-all, role-based, disposable, and consumer addresses.

Data
Freshness	live
Keep data	a limited, non-exclusive, non-transferable, non-sublicensable right to (A) view and store the Prospect Data [...] Prospect Data and Usage Data are Confidential Information of Fiber AI. [...] After any expiration or termination of these Terms, or at any time upon request from Fiber AI, Customer will immediately return or destroy (at Fiber AI's sole direction) all materials or media containing any Confidential Information
Use data	solely for purposes of conducting business-to-business sales, marketing, or business development activities and for Customer's other internal business purposes (the "Permitted Uses"). Customer may not resell, transfer, assign, or sublicense Customer's rights under these Terms to any third party or use the Services to run an outsourcing business or provide services for the benefit of any third party. [...] Customer (A) will not, and will ensure that Customer Personnel do not, incorporate any Prospect Data into Customer's products or services or otherwise resell, sublicense, or distribute any Prospect Data, (B) will not [...] present the Prospect Data so that it appears to be made available by any third party, (C) will process all Prospect Data in accordance with Laws, including Privacy and Data Laws [...] (F) not use the Services, including Prospect Data, to determine a consumer’s eligibility for (i) credit or insurance for personal, family or household purposes, (ii) employment or (iii) a government license or benefit or (iv) any other purpose governed by the Fair Credit Reporting Act [...] Customer will not [...] (h) develop any scripts or software applications that interact with or integrate with the Services unless first authorized in writing by Fiber AI [...] The Services are currently authorized to be used only in the United States to facilitate business-to-business sales, marketing, or business development communications with individuals in the United States

Plan
Pay	$0
You get	100 credits
Enough for	100 calls, once
Expires	when the 7 days pass without a card, the trial ends

Rate limit
Per second	5
Batch	1

Speed
Answer	in the call

The call
You send	email
Method	POST
Path	/v1/validate-email/single

About the plan
Plan	Cardless API trial
Who can get it	anyone with a work email, one trial per company domain, to use only in the United States

The 18 fields in the plan's answer

email, verdict, deliverability score, catch-all, role-based, disposable, consumer, email provider, charge method, credits charged, credits refunded, charge message, credits remaining, low credit message, get more credits URL, warning field, warning message, advice