# ProspectAPIs, free: Email finder API

> Checks the common company patterns for a person against the mail server, most common first, and returns the first that is valid.

ProspectAPIs's email finder API on its Free plan. It costs $0.00 per 1,000 emails. It returns 2 of the 10 key fields we check: Confidence, Company.
The cheapest of the 743 plans we rank by price is [DataForB2B, $499 monthly, Growth, POST /enrich/profile, 5,000,000 results a month](https://datacircle.dev/find-email-apis/dataforb2b/499-monthly-growth-post-enrich-profile-5000000-results-a-month/llms.txt), at $0.10 per 1,000 emails.

- This page: https://datacircle.dev/find-email-apis/prospectapis/free
- [Best email finder API in 2026](https://datacircle.dev/best-email-finder-api.txt)
- Get it: https://prospectapis.com/pricing
- Its API docs: https://prospectapis.com/docs/reference/email-find
- Sold by: ProspectAPIs (https://prospectapis.com)
- Checked: 2026-10-26

## In the answer

- Completeness: 20%
- Confidence: ✓
- Company: ✓

## Price

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

## Strengths

- Strengths: found live

## Aggregators

- Aggregators: none

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## Bounce

- Bounce refund: the check's price, credited back once when an address reported valid bounces and is reported through POST /v1/email/outcomes within 30 days, up to 10% of the valid checks charged in those 30 days

## In their words

- Their pitch: Checks the common company patterns for a person against the mail server, most common first, and returns the first that is valid.

## Data

- Freshness: live
- Keep data: no limit
- Use data: Check anything that matters before you rely on it, and do not use the service as the only basis for a decision with legal or similar effect on a person. You may use what the API returns inside your own products and workflows. You may not resell or republish the data as a substantially similar dataset or API. [...] Use of the service must follow the acceptable use policy. [...] This policy sets the limits on how the service and its output may be used. [...] Use it for: Researching companies and the people who publicly represent them in a business role. Preparing for sales calls and writing outreach that is relevant to the recipient. Account research, territory planning and enriching business records with funding history. Do not use it to: Profile private individuals, or research anyone outside a business context. Harass, stalk, threaten or discriminate against anyone. Send messages that break anti-spam or marketing consent laws where the recipient is. Make decisions about employment, credit, insurance or housing for an individual. Resell or republish the data as a substantially similar dataset or API. Share API keys between unrelated parties, or create accounts to multiply free records. Probe, overload or work around the rate limits, billing or security of the service. Send the research API inputs you have no right to share, such as confidential third-party data in context.

## Plan

- Pay: $0
- You get: $1
- Enough for: 50 calls, once
- Expires: never

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: in the call
- Median: 2.35 s

## The call

- You send: first_name, domain. Optional: last_name, Idempotency-Key
- Method: POST
- Path: /v1/email/find

## About the plan

- Plan: Free
- Who can get it: anyone, one account per person or company

## The 12 fields the plan's answer can hold

status, email, pattern, best guess, domain, score, recommendation, reason, checked addresses, charged, amount (USD), checked at

## ProspectAPIs's plans (5)

- [ProspectAPIs, free](https://datacircle.dev/find-email-apis/prospectapis/free/llms.txt): $0.00 per 1,000, 20% complete, live
- [ProspectAPIs, top-up from $10](https://datacircle.dev/find-email-apis/prospectapis/top-up-from-10/llms.txt): $20.00 per 1,000, 20% complete, live
- [ProspectAPIs, top-up from $100](https://datacircle.dev/find-email-apis/prospectapis/top-up-from-100/llms.txt): $16.00 per 1,000, 20% complete, live
- [ProspectAPIs, top-up from $500](https://datacircle.dev/find-email-apis/prospectapis/top-up-from-500/llms.txt): $12.50 per 1,000, 20% complete, live
- [ProspectAPIs, top-up from $2,000](https://datacircle.dev/find-email-apis/prospectapis/top-up-from-2000/llms.txt): $9.091 per 1,000, 20% complete, live

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

- `POST /v1/email/find`: [ProspectAPIs, free](https://datacircle.dev/find-email-apis/prospectapis/free/llms.txt)

## ProspectAPIs's APIs (4)

- [ProspectAPIs: company enrichment API pricing, 5 plans](https://datacircle.dev/company-enrichment-apis/prospectapis/free/llms.txt)
- [ProspectAPIs: email finder API pricing, 5 plans](https://datacircle.dev/find-email-apis/prospectapis/free/llms.txt)
- [ProspectAPIs: email verification API pricing, 5 plans, POST /v1/email/clean](https://datacircle.dev/validate-email-apis/prospectapis/free-free-post-v1-email-clean/llms.txt)
- [ProspectAPIs: email verification API pricing, 5 plans, POST /v1/email/verify/jobs](https://datacircle.dev/validate-email-apis/prospectapis/free-free-post-v1-email-verify-jobs/llms.txt)
- [ProspectAPIs: email verification API pricing, 5 plans, POST /v1/email/verify, Verify email addresses](https://datacircle.dev/validate-email-apis/prospectapis/free-free-post-v1-email-verify-verify-email-addresses/llms.txt)
- [ProspectAPIs: email verification API pricing, 5 plans, POST /v1/email/verify, Verify email addresses, quick check](https://datacircle.dev/validate-email-apis/prospectapis/free-free-post-v1-email-verify-verify-email-addresses-quick-check/llms.txt)
- [ProspectAPIs: cached company funding API pricing, 5 plans, POST /v1/watchlists](https://datacircle.dev/cached-company-funding-apis/prospectapis/free-free-post-v1-watchlists/llms.txt)
- [ProspectAPIs: cached company funding API pricing, 5 plans, GET /v1/funding/:id](https://datacircle.dev/cached-company-funding-apis/prospectapis/free-free-get-v1-funding-id/llms.txt)
- [ProspectAPIs: cached company funding API pricing, 5 plans, GET /v1/funding](https://datacircle.dev/cached-company-funding-apis/prospectapis/free-free-get-v1-funding/llms.txt)

## ProspectAPIs: email finder API alternatives

- [HarvestAPI on Apify, $10,788 yearly](https://datacircle.dev/find-email-apis/harvestapi-on-apify/10788-yearly/llms.txt): $8.999 per 1,000, 50% complete, live
- [Sealch, $9 monthly](https://datacircle.dev/find-email-apis/sealch/9-monthly/llms.txt): $9.00 per 1,000, 20% complete, live
- [MyEmailVerifier, $159 monthly, Monthly Subscription, 250,000 emails + 12,500 bonus, POST /leads/search/{apikey}](https://datacircle.dev/find-email-apis/myemailverifier/159-monthly-monthly-subscription-250000-emails-12500-bonus-post-leads-search-apikey/llms.txt): $9.086 per 1,000, 20% complete, live
- [Airscale, $5,490 yearly, Growth 1,200,000 / year, POST /v1/email](https://datacircle.dev/find-email-apis/airscale/5490-yearly-growth-1200000-year-post-v1-email/llms.txt): $9.15 per 1,000, 30% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-26.

- https://prospectapis.com
- https://prospectapis.com/acceptable-use
- https://prospectapis.com/docs/email-verification
- https://prospectapis.com/docs/rate-limits
- https://prospectapis.com/docs/reference/email-find
- https://prospectapis.com/pricing
- https://prospectapis.com/terms