# ProspectAPIs, free: Company enrichment API

> The prospect research API returns a structured brief on one prospect from a single identifier, such as a domain, an email or a LinkedIn URL, for account research, a sales call or outreach.

ProspectAPIs's company enrichment API on its Free plan. It costs $0.00 per 1,000 companies. It returns 5 of the 13 key fields we check: Description, Employees, Social profiles, Headquarters, Funding.
The cheapest of the 273 plans we rank by price is [treg, top-up from $200](https://datacircle.dev/company-enrichment-apis/treg/top-up-from-200/llms.txt). treg asks one provider after another until one answers. treg costs $0.496 per 1,000 companies on average. You pay $59.565 per 1,000 companies when no provider answers.

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

## In the answer

- Completeness: 38%
- Description: ✓
- Employees: ✓
- Social profiles: ✓
- Headquarters: ✓
- Funding: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Search funding rounds · Read one funding round · Create a watchlist · Verify email addresses · Clean a list · Start a verification job · Find an email address

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: The prospect research API returns a structured brief on one prospect from a single identifier, such as a domain, an email or a LinkedIn URL, for account research, a sales call or outreach.

## 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: about 6 calls, once
- Expires: never

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: by polling
- Median: 29.47 s

## The call

- You send: one of domain, website_url, company_name, company_linkedin_url, email, linkedin_url or person_name with company_name. Optional: context, purpose
- Method: POST
- Path: /v1/research

## About the plan

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

## The 36 fields the plan's answer can hold

research ID, status, created at, completed at, company description, headquarters, size signals, company social profiles, funding rounds, lead investors, total raised, named customers, pricing signals, hiring signals, competitors, competitor differences, news, X handle, X followers, X bio, X posting cadence, X recent topics, X notable posts, Reddit mention count (90 days), Reddit top threads, Reddit communities, Reddit tone, founders and leaders, risks, fit angles, likely objections, discovery questions, outreach hooks, regions, sources, confidence score

## ProspectAPIs's plans (5)

- [ProspectAPIs, free](https://datacircle.dev/company-enrichment-apis/prospectapis/free/llms.txt): $0.00 per 1,000, 38% complete, live
- [ProspectAPIs, top-up from $10](https://datacircle.dev/company-enrichment-apis/prospectapis/top-up-from-10/llms.txt): $150.00 per 1,000, 38% complete, live
- [ProspectAPIs, top-up from $100](https://datacircle.dev/company-enrichment-apis/prospectapis/top-up-from-100/llms.txt): $120.00 per 1,000, 38% complete, live
- [ProspectAPIs, top-up from $500](https://datacircle.dev/company-enrichment-apis/prospectapis/top-up-from-500/llms.txt): $93.75 per 1,000, 38% complete, live
- [ProspectAPIs, top-up from $2,000](https://datacircle.dev/company-enrichment-apis/prospectapis/top-up-from-2000/llms.txt): $68.182 per 1,000, 38% complete, live

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

- `POST /v1/research`: [ProspectAPIs, free](https://datacircle.dev/company-enrichment-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: company enrichment API alternatives

- [Context.dev, $20 monthly, Developer, POST /v1/brand/retrieve, Lookup by ticker](https://datacircle.dev/company-enrichment-apis/context-dev/20-monthly-developer-post-v1-brand-retrieve-lookup-by-ticker/llms.txt): $20.00 per 1,000, 62% complete, live
- [Interzoid, $30,000 yearly, 1 Million Credits (annual), GET /getbusinessinfo](https://datacircle.dev/company-enrichment-apis/interzoid/30000-yearly/llms.txt): $62.50 per 1,000, 38% complete, live
- [NinjaPear, $1,000 pack](https://datacircle.dev/company-enrichment-apis/ninjapear/1000-pack/llms.txt): $64.799 per 1,000, 77% complete, live
- [Anysite, $49 monthly](https://datacircle.dev/company-enrichment-apis/anysite/49-monthly/llms.txt): $65.333 per 1,000, 92% 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/rate-limits
- https://prospectapis.com/docs/reference/get-research
- https://prospectapis.com/docs/reference/submit-research
- https://prospectapis.com/docs/research
- https://prospectapis.com/pricing
- https://prospectapis.com/terms