# Leadbase, free: Phone finder API

> Find work email addresses and direct phone numbers using an identifiable professional profile.

Leadbase's Free plan for the phone finder API costs $0.00 per 1,000 phones. We check each provider's docs for 11 fields. Leadbase's docs list 1: Number.
In [our phone finder API benchmark](https://datacircle.dev/best-phone-finder-api.txt), the best plan from Leadbase scores 43.4 out of 100. Leadbase ranks 12th of 43 providers.
This plan is free. We rank 815 plans for phone finder APIs by price. Half the plans cost $250.00 or less per 1,000 phones. [See the best free phone finder API plan.](https://datacircle.dev/best-phone-finder-api.txt)
[QuickEnrich's $399 monthly plan](https://datacircle.dev/find-phone-apis/quickenrich/399-monthly/llms.txt) costs the least per 1,000 phones. QuickEnrich's $399 monthly plan charges nothing per call. You get as many phones as QuickEnrich's rate limit allows. [StableEnrich's pay-as-you-go plan](https://datacircle.dev/find-phone-apis/stableenrich/pay-as-you-go-pay-per-request-with-x402-or-mpp-post-api-minerva-enrich/llms.txt) costs the least for 10,000 phones a month: $1.00.
[MillionPhones](https://datacircle.dev/find-phone-apis/millionphones/300-monthly-pro-40000-credits-mo-get-phone/llms.txt), [Fiber AI](https://datacircle.dev/find-phone-apis/fiber-ai/top-up-from-3-pay-as-you-go-post-v1-contact-details-single/llms.txt) and [treg](https://datacircle.dev/find-phone-apis/treg/top-up-from-10/llms.txt) are the best phone finder API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/find-phone-apis/leadbase/free
- [Phone finder API in 2026: the best of 40+ providers compared](https://datacircle.dev/best-phone-finder-api.txt)
- Get it: https://www.leadbase.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- Request: `POST https://www.leadbase.io/api/v1/operations/prospects.find_phone`
- API key: with the plan, on https://www.leadbase.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- Its API docs: https://www.leadbase.io/docs/enrichment/contact-data?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- Sold by: Leadbase (https://www.leadbase.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 9%
- Number: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Prospects Company Search · Prospects People Search · Prospects Find Email · Enrichment Start · Sheets Research · Sheets Enrich · Tools Run

## Overage

- Units cap: hard

## Not found

- $ per 1,000 calls that find nothing: $0.00

## In their words

- Their pitch: Find work email addresses and direct phone numbers using an identifiable professional profile.

## Data

- Keep data: no limit
- Use data: Leadbase grants the customer a non-exclusive, non-transferable, revocable right of use for the services and provided data for the term of the contract. This right is limited to the agreed use and the booked service level. Permitted use: Lead generation and prospecting for own business purposes, CRM data enrichment for existing customer databases, Sales and marketing activities in the B2B area, Integration into own business processes and software tools, Forwarding enriched data to employees and authorized service providers. Prohibited use: Resale, rental or commercial transfer of data to third parties, Reverse engineering, decompilation or replication of the platform, Automated mass queries outside the API limits, Use for spam, unwanted advertising or harassment, Data breaches or breaches of opt-out requests, Use for illegal, harmful or discriminatory purposes, Creation of competing products or services. Absolutely prohibited use: Spam, unwanted mass advertising or cold email campaigns without legal basis, Sale, rental or other commercial transfer of data, Use for credit checks, background checks or other SCHUFA-like purposes, Discrimination based on sex, race, religion or other characteristics, Stalking, harassment or other unlawful contact, Generating fake identities or fake company profiles, Use for political campaigns without corresponding licensing, Breach of embargoes or trade restrictions.

## Plan

- Pay: €0
- You get: 200 credits
- Enough for: 40 calls, once
- Expires: never

## Rate limit

- Per second: 10
- Batch: 1

## Speed

- Answer: in the call
- Median: 21.87 s

## The call

- You send: idempotencyKey, identity.kind "linkedin", identity.linkedinUrl. Optional: identity.firstName, identity.lastName, identity.companyDomain, identity.companyName, identity.countryCode, identity.jobTitle
- Method: POST
- Path: /api/v1/operations/prospects.find_phone

## About the plan

- Plan: Free
- Who can get it: business customers only ("Leadbase is intended exclusively for business customers (B2B)")

## The 9 fields the plan's answer can hold

phone, status, group ID, eligible options, compatible options, skipped options, attempts, presence decision, cost in micro-USD

## Leadbase's plans (4)

- [Leadbase, free](https://datacircle.dev/find-phone-apis/leadbase/free/llms.txt): $0.00 per 1,000, 9% complete
- [Leadbase, €390 monthly](https://datacircle.dev/find-phone-apis/leadbase/390-monthly/llms.txt): $450.12 per 1,000, 9% complete
- [Leadbase, €590 monthly](https://datacircle.dev/find-phone-apis/leadbase/590-monthly/llms.txt): $390.545 per 1,000, 9% complete
- [Leadbase, €990 monthly](https://datacircle.dev/find-phone-apis/leadbase/990-monthly/llms.txt): $337.59 per 1,000, 9% complete

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

- `POST /api/v1/operations/prospects.find_phone`: [Leadbase, free](https://datacircle.dev/find-phone-apis/leadbase/free/llms.txt)

## Leadbase's APIs (4)

- [Leadbase: company discovery API pricing, 4 plans](https://datacircle.dev/company-discovery-apis/leadbase/free/llms.txt)
- [Leadbase: email finder API pricing, 4 plans](https://datacircle.dev/find-email-apis/leadbase/free/llms.txt)
- [Leadbase: phone finder API pricing, 4 plans](https://datacircle.dev/find-phone-apis/leadbase/free/llms.txt)
- [Leadbase: people search API pricing, 4 plans](https://datacircle.dev/people-search-apis/leadbase/free/llms.txt)

## Leadbase: phone finder API alternatives

- [Pipecorn, $2,149 monthly, Scale, 192,000 credits a month, POST /contacts/single_enrich, Synchronous Single Contact Enrichment](https://datacircle.dev/find-phone-apis/pipecorn/2149-monthly-scale-192000-credits-a-month-post-contacts-single-enrich-synchronous-single-contact-enrichment/llms.txt): $335.781 per 1,000, 45% complete, live
- [EasyLeadz, ₹143,998.92 yearly](https://datacircle.dev/find-phone-apis/easyleadz/143998-92-yearly/llms.txt): $336.957 per 1,000, 9% complete
- [LeadIQ, $1,174.56 yearly, Pro, 34,800 credits a year, POST /graphql, searchPeople](https://datacircle.dev/find-phone-apis/leadiq/1174-56-yearly-pro-34800-credits-a-year-post-graphql-searchpeople/llms.txt): $337.517 per 1,000, 82% complete, 1 month
- [Listar, top-up from €100,000, Diamond, POST /search/unified](https://datacircle.dev/find-phone-apis/listar/top-up-from-100000-diamond-post-search-unified/llms.txt): $337.59 per 1,000, 73% 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 2026-11-10.

- https://www.leadbase.io/api/v1/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- https://www.leadbase.io/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- https://www.leadbase.io/docs/api/authentication?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- https://www.leadbase.io/docs/enrichment/contact-data?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- https://www.leadbase.io/legal/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- https://www.leadbase.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing