# Fiber AI, free, Cardless API trial: Similar companies API

> Start an AI lookalike run: give it companies you like (by domain), and it finds and grades similar companies, grouped by the patterns in your list.

Fiber AI's similar companies API on its Cardless API trial plan. It costs $0.00 per 1,000 companies. It returns 2 of the 13 key fields we check: Match, Domain.
We rank 120 plans by price. [PublicWWW's $499 monthly plan](https://datacircle.dev/similar-company-apis/publicwww/499-monthly/llms.txt) costs the least per 1,000 companies: $0.000055. PublicWWW charges for each page of results. We count 1,000,000 companies on each page to get the $0.000055 price.
[ZoomInfo's $45 pack](https://datacircle.dev/similar-company-apis/zoominfo/45-pack/llms.txt) covers any number of companies. ZoomInfo's $45 pack costs less up front than PublicWWW's $499 monthly plan.
[LeadMagic](https://datacircle.dev/similar-company-apis/leadmagic/499-monthly-professional-post-v3-companies-lookalike/llms.txt), [Tomba](https://datacircle.dev/similar-company-apis/tomba/449-monthly/llms.txt) and [Social Fetch](https://datacircle.dev/similar-company-apis/social-fetch/14-pack/llms.txt) are the best similar companies API providers in our benchmark.

- This page: https://datacircle.dev/similar-company-apis/fiber-ai/free-cardless-api-trial
- [Best similar companies API in 2026: providers compared](https://datacircle.dev/best-similar-companies-api.txt)
- Get it: https://www.fiber.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Request: `POST https://api.fiber.ai/v1/lookalikes/trigger`
- API key: with the plan, on https://www.fiber.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Its API docs: https://api.fiber.ai/ai-docs/lookalikesTrigger.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Sold by: Fiber AI (https://www.fiber.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing)
- Checked: 2026-11-01

## In the answer

- Completeness: 15%
- Match: ✓
- Domain: ✓

## Price

- $ per 1,000 companies: $0.00
- Per: result
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: Export audience companies to CSV · Export audience prospects to CSV · from the same budget: Work email reveal · Personal email reveal · Phone number reveal · Live company fetch · Live fetch (batch start) · Company search result · People search result · Job posting search · Company count · People count · Job posting count · Agentic / natural-language search · Google Maps / local business · Investor search · Combined search · Audience build · Audience enrichment · Tracker entity check · Full reverse email lookup · Lite reverse email lookup · Kitchen Sink resolution · Hashed email lookup · Hotel search page · Hotel property lookup

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Start an AI lookalike run: give it companies you like (by domain), and it finds and grades similar companies, grouped by the patterns in your list.

## 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: 500 results, once
- Expires: when the 7 days pass without a card, the trial ends

## Rate limit

- Per second: 0.17

## Speed

- Answer: by polling

## The call

- You send: companies[].domain. Optional: companies[].importanceOutOf10, maxBuckets, companyExclusionListIDs, filters
- Method: POST
- Path: /v1/lookalikes/trigger

## 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 13 fields the plan's answer can hold

name, domain, similarity score, opportunity score, match confidence, rationale, bucket name, bucket description, member company names, overall summary, run ID, status, unresolved domains

## Fiber AI's plans (9)

- [Fiber AI, free, Cardless API trial](https://datacircle.dev/similar-company-apis/fiber-ai/free-cardless-api-trial/llms.txt): $0.00 per 1,000, 15% complete
- [Fiber AI, free, 7-day free trial](https://datacircle.dev/similar-company-apis/fiber-ai/free-7-day-free-trial/llms.txt): $0.00 per 1,000, 15% complete
- [Fiber AI, top-up from $3](https://datacircle.dev/similar-company-apis/fiber-ai/top-up-from-3/llms.txt): $6.00 per 1,000, 15% complete
- [Fiber AI, $300 monthly](https://datacircle.dev/similar-company-apis/fiber-ai/300-monthly/llms.txt): $4.00 per 1,000, 15% complete
- [Fiber AI, $900 monthly](https://datacircle.dev/similar-company-apis/fiber-ai/900-monthly/llms.txt): $3.60 per 1,000, 15% complete
- [Fiber AI, $2,400 monthly](https://datacircle.dev/similar-company-apis/fiber-ai/2400-monthly/llms.txt): $3.20 per 1,000, 15% complete
- [Fiber AI, $3,000 yearly](https://datacircle.dev/similar-company-apis/fiber-ai/3000-yearly/llms.txt): $3.333 per 1,000, 15% complete
- [Fiber AI, $9,000 yearly](https://datacircle.dev/similar-company-apis/fiber-ai/9000-yearly/llms.txt): $3.00 per 1,000, 15% complete
- [Fiber AI, $24,000 yearly](https://datacircle.dev/similar-company-apis/fiber-ai/24000-yearly/llms.txt): $2.667 per 1,000, 15% complete

## Fiber AI's calls for this API (1)

- `POST /v1/lookalikes/trigger`: [Fiber AI, free, Cardless API trial](https://datacircle.dev/similar-company-apis/fiber-ai/free-cardless-api-trial/llms.txt)

## Fiber AI's APIs (11)

- [Fiber AI: similar companies API pricing, 9 plans](https://datacircle.dev/similar-company-apis/fiber-ai/free-cardless-api-trial/llms.txt)
- [Fiber AI: email verification API pricing, 9 plans](https://datacircle.dev/validate-email-apis/fiber-ai/free-cardless-api-trial/llms.txt)
- [Fiber AI: GitHub profile API pricing, 9 plans](https://datacircle.dev/github-profile-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, basic-work-email](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-basic-work-email/llms.txt)
- [Fiber AI: email finder API pricing, 9 plans, lite](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-lite/llms.txt)
- [Fiber AI: email finder API pricing, 9 plans, single, Reveal contact details (standard)](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-single/llms.txt)
- [Fiber AI: email finder API pricing, 9 plans, 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)
- [Fiber AI: email finder API pricing, 9 plans, reveal, Reveal contact details (time-budgeted)](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-reveal-reveal-contact-details-time-budgeted/llms.txt)
- [Fiber AI: email finder API pricing, 9 plans, reveal, Reveal contact details (time-budgeted), full](https://datacircle.dev/find-email-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-reveal-reveal-contact-details-time-budgeted-full/llms.txt)
- [Fiber AI: email finder API pricing, 9 plans, 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)
- [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: email finder API pricing, 9 plans, 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)
- [Fiber AI: email finder API pricing, 9 plans, 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)
- [Fiber AI: email finder API pricing, 9 plans, 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)
- [Fiber AI: email finder API pricing, 9 plans, 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: 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/reveal](https://datacircle.dev/find-phone-apis/fiber-ai/free-cardless-api-trial-post-v1-contact-details-reveal/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: similar companies API alternatives

- [Derrick, €47.50 monthly](https://datacircle.dev/similar-company-apis/derrick/47-50-monthly/llms.txt): $2.138 per 1,000, 31% complete
- [Implisense, €49 pack, 500 Implicents, GET /v2/companies/{id}/peers](https://datacircle.dev/similar-company-apis/implisense/49-pack-500-implicents-get-v2-companies-id-peers/llms.txt): $2.206 per 1,000, 15% complete, 1 day
- [Edges, $81,950 monthly](https://datacircle.dev/similar-company-apis/edges/81950-monthly/llms.txt): $2.46 per 1,000, 15% complete, live
- [Pubrio, $125 monthly](https://datacircle.dev/similar-company-apis/pubrio/125-monthly/llms.txt): $2.50 per 1,000, 62% complete, 1 day
- [DiscoLike, $950 yearly](https://datacircle.dev/similar-company-apis/discolike/950-yearly/llms.txt): $2.799 per 1,000, 69% complete, 30 days

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-01.

- https://api.fiber.ai/ai-docs/lookalikesTrigger.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://docs.fiber.ai/billing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://docs.fiber.ai/billing/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://docs.fiber.ai/build/rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://docs.fiber.ai/linkedin/live-fetch?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://www.fiber.ai/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://www.fiber.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://www.fiber.ai/pricing.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://www.fiber.ai/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing