# Fiber AI, free, Cardless API trial, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full: Email finder API

> Fastest synchronous contact reveal — optimized for speed at a higher credit cost. Uses a premium enrichment stack for the lowest possible latency. For a cheaper option with slightly longer response times, use the standard /contact-details/single endpoint. For maximum coverage (async, slower), use the /contact-details/exhaustive/start endpoint.

Fiber AI's email finder API on its Cardless API trial plan. It costs $0.00 per 1,000 emails. It returns 4 of the 10 key fields we check: Verification, Personal email, Name, LinkedIn URL.
We rank 1,285 plans by price. [ClearBounce's $3.20 monthly plan](https://datacircle.dev/find-email-apis/clearbounce/3-20-monthly/llms.txt) costs the least per 1,000 emails: as little as $0.00074. ClearBounce's $3.20 monthly plan covers up to 4,320,000 emails a month at no extra cost.
[ClearBounce's $4 pack](https://datacircle.dev/find-email-apis/clearbounce/4-pack/llms.txt) covers any number of emails. ClearBounce's $4 pack costs more to start than ClearBounce's $3.20 monthly plan.
[GetProspect](https://datacircle.dev/find-email-apis/getprospect/399-monthly-growth-50k-post-v2-email-find/llms.txt), [OrbiSearch](https://datacircle.dev/find-email-apis/orbisearch/207-pack-enterprise-post-v1-email-lookup/llms.txt) and [DataForB2B](https://datacircle.dev/find-email-apis/dataforb2b/499-monthly-growth-post-enrich-profile-5000000-results-a-month/llms.txt) are the best email finder API providers in our benchmark.

- This page: https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full
- [Best email finder API in 2026](https://datacircle.dev/best-email-finder-api.txt)
- Get it: https://www.fiber.ai/pricing
- Request: `POST https://api.fiber.ai/v1/contact-details/turbo/sync`, Reveal contact details (turbo), full
- API key: with the plan, on https://www.fiber.ai/pricing
- Its API docs: https://api.fiber.ai/ai-docs/syncTurboContactEnrichment.md
- Sold by: Fiber AI (https://www.fiber.ai)
- Checked: 2026-10-23

## In the answer

- Completeness: 40%
- Verification: ✓
- Personal email: ✓
- Name: ✓
- LinkedIn URL: ✓

## Price

- $ per 1,000 emails: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Fastest synchronous contact reveal — optimized for speed at a higher credit cost. Uses a premium enrichment stack for the lowest possible latency. For a cheaper option with slightly longer response times, use the standard /contact-details/single endpoint. For maximum coverage (async, slower), use the /contact-details/exhaustive/start endpoint.

## Data

- 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: about 14 calls, once
- Expires: when the 7 days pass without a card, the trial ends

## Rate limit

- Per second: 2
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: linkedinUrl. Optional: enrichmentType.getWorkEmails, enrichmentType.getPersonalEmails "true", enrichmentType.getPhoneNumbers "true", patience, company.identifier, company.value
- Method: POST
- Path: /v1/contact-details/turbo/sync

## 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 11 fields the plan's answer can hold

full name, email, email type, email status, unmatched work email, unmatched work email type, unmatched work email status, LinkedIn URL, personal email, phone number, phone type

## Fiber AI's plans (9)

- [Fiber AI, free, Cardless API trial, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $0.00 per 1,000, 40% complete
- [Fiber AI, free, 7-day free trial, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/free-7-day-free-trial-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $0.00 per 1,000, 40% complete
- [Fiber AI, top-up from $3, Pay-as-you-go, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/top-up-from-3-pay-as-you-go-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $210.00 per 1,000, 40% complete
- [Fiber AI, $300 monthly, Prospector, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/300-monthly-prospector-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $140.00 per 1,000, 40% complete
- [Fiber AI, $900 monthly, Growth, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/900-monthly-growth-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $126.00 per 1,000, 40% complete
- [Fiber AI, $2,400 monthly, Enterprise, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/2400-monthly-enterprise-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $112.00 per 1,000, 40% complete
- [Fiber AI, $3,000 yearly, Prospector, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/3000-yearly-prospector-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $116.667 per 1,000, 40% complete
- [Fiber AI, $9,000 yearly, Growth, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/9000-yearly-growth-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $105.00 per 1,000, 40% complete
- [Fiber AI, $24,000 yearly, Enterprise, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/24000-yearly-enterprise-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt): $93.333 per 1,000, 40% complete

## Fiber AI's calls for this API (10)

- `POST /v1/contact-details/basic-work-email`: [Fiber AI, free, Cardless API trial, POST /v1/contact-details/basic-work-email](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-basic-work-email/llms.txt)
- `POST /v1/contact-details/lite`: [Fiber AI, free, Cardless API trial, POST /v1/contact-details/lite](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-lite/llms.txt)
- `POST /v1/contact-details/single`, Reveal contact details (standard): [Fiber AI, free, Cardless API trial, POST /v1/contact-details/single, Reveal contact details (standard)](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-single/llms.txt)
- `POST /v1/contact-details/single`, Reveal contact details (standard), full: [Fiber AI, free, Cardless API trial, POST /v1/contact-details/single, Reveal contact details (standard), full](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-single-reveal-contact-details-standard-full/llms.txt)
- `POST /v1/contact-details/turbo/sync`, Reveal contact details (turbo): [Fiber AI, free, Cardless API trial, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo)](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-turbo-sync/llms.txt)
- `POST /v1/contact-details/turbo/sync`, Reveal contact details (turbo), full: [Fiber AI, free, Cardless API trial, POST /v1/contact-details/turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt)
- `POST /v1/contact-details/batch/start`, Start batch contact details: [Fiber AI, free, Cardless API trial, POST /v1/contact-details/batch/start, Start batch contact details](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-batch-start/llms.txt)
- `POST /v1/contact-details/batch/start`, Start batch contact details, full: [Fiber AI, free, Cardless API trial, POST /v1/contact-details/batch/start, Start batch contact details, full](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-batch-start-start-batch-contact-details-full/llms.txt)
- `POST /v1/contact-details/exhaustive/start`, Start exhaustive contact details reveal: [Fiber AI, free, Cardless API trial, POST /v1/contact-details/exhaustive/start, Start exhaustive contact details reveal](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-exhaustive-start/llms.txt)
- `POST /v1/contact-details/exhaustive/start`, Start exhaustive contact details reveal, full: [Fiber AI, free, Cardless API trial, POST /v1/contact-details/exhaustive/start, Start exhaustive contact details reveal, full](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-exhaustive-start-start-exhaustive-contact-details-reveal-full/llms.txt)

## Fiber AI's APIs (9)

- [Fiber AI: email verification API pricing, 9 plans](https://datacircle.dev/validate-email-apis/fiber-ai/free-cardless-api-trial/llms.txt)
- [Fiber AI: LinkedIn company search API pricing, 13 plans](https://datacircle.dev/linkedin-company-search-apis/fiber-ai/free-cardless-api-trial/llms.txt)
- [Fiber AI: LinkedIn people search API pricing, 13 plans](https://datacircle.dev/linkedin-people-search-apis/fiber-ai/free-cardless-api-trial/llms.txt)
- [Fiber AI: LinkedIn job search API pricing, 13 plans](https://datacircle.dev/linkedin-job-search-apis/fiber-ai/free-cardless-api-trial/llms.txt)
- [Fiber AI: reverse email lookup API pricing, 9 plans, POST /v1/email-to-person/single/lite](https://datacircle.dev/reverse-email-lookup-apis/fiber-ai/free-cardless-api-trial-post-v1-email-to-person-single-lite/llms.txt)
- [Fiber AI: reverse email lookup API pricing, 9 plans, POST /v1/email-to-person/single](https://datacircle.dev/reverse-email-lookup-apis/fiber-ai/free-cardless-api-trial-post-v1-email-to-person-single/llms.txt)
- [Fiber AI: email finder API pricing, 9 plans, turbo/sync, Reveal contact details (turbo), full](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-turbo-sync-reveal-contact-details-turbo-full/llms.txt)
- [Fiber AI: LinkedIn company data API pricing, 12 plans, POST /v1/kitchen-sink/company](https://datacircle.dev/linkedin-company-profile-apis/fiber-ai/free-cardless-api-trial-post-v1-kitchen-sink-company/llms.txt)
- [Fiber AI: LinkedIn company data API pricing, 12 plans, POST /v1/linkedin-live-fetch/company/single](https://datacircle.dev/linkedin-company-profile-apis/fiber-ai/free-cardless-api-trial-post-v1-linkedin-live-fetch-company-single/llms.txt)
- [Fiber AI: LinkedIn company data API pricing, 12 plans, POST /v1/linkedin-live-fetch/batch/start](https://datacircle.dev/linkedin-company-profile-apis/fiber-ai/free-cardless-api-trial-post-v1-linkedin-live-fetch-batch-start/llms.txt)
- [Fiber AI: LinkedIn profile API pricing, 12 plans, kitchen-sink/person, Kitchen sink person lookup](https://datacircle.dev/linkedin-profile-apis/fiber-ai/free-cardless-api-trial-post-v1-kitchen-sink-person-kitchen-sink-person-lookup/llms.txt)
- [Fiber AI: LinkedIn profile API pricing, 12 plans, kitchen-sink/person, Kitchen sink person lookup with liveFetch](https://datacircle.dev/linkedin-profile-apis/fiber-ai/free-cardless-api-trial-post-v1-kitchen-sink-person/llms.txt)
- [Fiber AI: LinkedIn profile API pricing, 12 plans, linkedin-live-fetch/profile/single](https://datacircle.dev/linkedin-profile-apis/fiber-ai/free-cardless-api-trial/llms.txt)
- [Fiber AI: LinkedIn profile API pricing, 12 plans, linkedin-live-fetch/batch/start](https://datacircle.dev/linkedin-profile-apis/fiber-ai/free-cardless-api-trial-post-v1-linkedin-live-fetch-batch-start/llms.txt)
- [Fiber AI: phone finder API pricing, 9 plans, POST /v1/contact-details/premium-phone/sync](https://datacircle.dev/find-phone-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-premium-phone-sync/llms.txt)
- [Fiber AI: phone finder API pricing, 9 plans, POST /v1/contact-details/lite](https://datacircle.dev/find-phone-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-lite/llms.txt)
- [Fiber AI: phone finder API pricing, 9 plans, POST /v1/contact-details/single](https://datacircle.dev/find-phone-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-single/llms.txt)
- [Fiber AI: phone finder API pricing, 9 plans, POST /v1/contact-details/turbo/sync](https://datacircle.dev/find-phone-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-turbo-sync/llms.txt)
- [Fiber AI: phone finder API pricing, 9 plans, POST /v1/contact-details/batch/start](https://datacircle.dev/find-phone-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-batch-start/llms.txt)
- [Fiber AI: phone finder API pricing, 9 plans, POST /v1/contact-details/exhaustive/start](https://datacircle.dev/find-phone-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-exhaustive-start/llms.txt)

## Fiber AI: email finder API alternatives

- [Lix, $229 monthly](https://datacircle.dev/find-email-apis/lix/229-monthly/llms.txt): $91.60 per 1,000, 10% complete, live
- [BetterEnrich, $470 pack, One-time Payment, 20K credits, POST /api/v1/find-personal-email](https://datacircle.dev/find-email-apis/betterenrich/470-pack-one-time-payment-20k-credits-post-api-v1-find-personal-email/llms.txt): $94.00 per 1,000, 20% complete, live
- [Forager, $100 monthly, Growth, POST /api/v2/{account_id}/datastorage/person_contacts_lookup/work_emails/bulk/](https://datacircle.dev/find-email-apis/forager/100-monthly-growth-post-api-v2-account-id-datastorage-person-contacts-lookup-work-emails-bulk/llms.txt): $95.238 per 1,000, 10% complete
- [1Lookup, $799 monthly, Professional, POST /bulk/jobs, Create a bulk job (type linkedin_email_finder)](https://datacircle.dev/find-email-apis/1lookup/799-monthly-professional-post-bulk-jobs-create-a-bulk-job-type-linkedin-email-finder/llms.txt): $95.88 per 1,000, 50% 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 2026-10-23.

- https://api.fiber.ai/ai-docs/syncTurboContactEnrichment.md
- https://api.fiber.ai/llms-full.txt
- https://docs.fiber.ai/billing
- https://docs.fiber.ai/billing/pricing
- https://docs.fiber.ai/build/rate-limits
- https://docs.fiber.ai/enrichment/contact-reveal
- https://docs.fiber.ai/linkedin/live-fetch
- https://www.fiber.ai/llms.txt
- https://www.fiber.ai/pricing
- https://www.fiber.ai/pricing.md
- https://www.fiber.ai/terms