# RootData, free: Company discovery API

> Search for project/institution brief information by project/institution name, token, introduction, unlimited number of times

RootData's Basic plan for the company discovery API costs $0.00 per 1,000 companies. We check each provider's docs for 13 fields. RootData's docs list 3: Description, Type and status, Images.
We haven't run RootData through [our company discovery API benchmark](https://datacircle.dev/best-company-discovery-api.txt) yet.
This plan is free. We rank 1,252 plans for company discovery APIs by price. Half the plans cost $0.40 or less per 1,000 companies. [See the best free company discovery API plan.](https://datacircle.dev/best-company-discovery-api.txt)
[StackScan's $189 monthly plan](https://datacircle.dev/company-discovery-apis/stackscan/189-monthly-enterprise-post-v1-tech-lookup-lists/llms.txt) is the cheapest paid plan per 1,000 companies. StackScan's $189 monthly plan charges nothing per call. You get as many companies as StackScan's rate limit allows. [Seltz's pay-as-you-go plan](https://datacircle.dev/company-discovery-apis/seltz/pay-as-you-go-pay-as-you-go-post-v1-search-search-base/llms.txt) costs the least for 10,000 companies a month: $0.03.
[PeopleSearch.im's $5 pack](https://datacircle.dev/company-discovery-apis/peoplesearch-im/5-pack/llms.txt) covers any number of companies. PeopleSearch.im's $5 pack costs less up front than StackScan's $189 monthly plan.
[GetProspect](https://datacircle.dev/company-discovery-apis/getprospect/49-monthly/llms.txt), [Hunter](https://datacircle.dev/company-discovery-apis/hunter/49-monthly-starter-post-discover/llms.txt) and [PeopleSearch.im](https://datacircle.dev/company-discovery-apis/peoplesearch-im/5-pack/llms.txt) are the best company discovery API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/company-discovery-apis/rootdata/free
- [Company discovery API in 2026: the best of 100+ compared](https://datacircle.dev/best-company-discovery-api.txt)
- Get it: https://www.rootdata.com/Api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- Request: `POST https://api.rootdata.com/open/ser_inv`
- API key: with the plan, on https://www.rootdata.com/Api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- Its API docs: https://www.rootdata.com/Api/Doc?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- Sold by: RootData (https://www.rootdata.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 23%
- Description: ✓
- Type and status: ✓
- Images: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Query Project · Query VC

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Search for project/institution brief information by project/institution name, token, introduction, unlimited number of times

## Data

- Keep data: no API terms
- Use data: comply with the relevant terms of use and restrictions when using the API, and provide appropriate attribution and references where appropriate

## Plan

- Pay: $0
- You get: 1,000 credits a month

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: query. Optional: language
- Method: POST
- Path: /ser_inv

## About the plan

- Plan: Basic
- Who can get it: anyone who applies for a key

## The 6 fields the plan's answer can hold

ID, type, name, logo, description, RootData URL

## RootData's plans (6)

- [RootData, free](https://datacircle.dev/company-discovery-apis/rootdata/free/llms.txt): $0.00 per 1,000, 23% complete
- [RootData, $128 monthly](https://datacircle.dev/company-discovery-apis/rootdata/128-monthly/llms.txt): 23% complete
- [RootData, $328 monthly](https://datacircle.dev/company-discovery-apis/rootdata/328-monthly/llms.txt): 23% complete
- [RootData, $1,200 yearly](https://datacircle.dev/company-discovery-apis/rootdata/1200-yearly/llms.txt): 23% complete
- [RootData, $3,600 yearly](https://datacircle.dev/company-discovery-apis/rootdata/3600-yearly/llms.txt): 23% complete
- [RootData, contact us](https://datacircle.dev/company-discovery-apis/rootdata/contact-us/llms.txt): 23% complete

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

- `POST /ser_inv`: [RootData, free](https://datacircle.dev/company-discovery-apis/rootdata/free/llms.txt)

## RootData's APIs (3)

- [RootData: company discovery API pricing, 6 plans](https://datacircle.dev/company-discovery-apis/rootdata/free/llms.txt)
- [RootData: company enrichment API pricing, 6 plans, POST /get_item](https://datacircle.dev/company-enrichment-apis/rootdata/free-basic-post-get-item/llms.txt)
- [RootData: company enrichment API pricing, 6 plans, POST /get_org](https://datacircle.dev/company-enrichment-apis/rootdata/free-basic-post-get-org/llms.txt)
- [RootData: company funding API pricing, 5 plans](https://datacircle.dev/company-funding-apis/rootdata/128-monthly/llms.txt)

## RootData: company discovery API alternatives

- [GetProspect, free](https://datacircle.dev/company-discovery-apis/getprospect/free/llms.txt): $0.00 per 1,000, 62% complete, stored
- [Hunter, free, POST /discover](https://datacircle.dev/company-discovery-apis/hunter/free-post-discover/llms.txt): $0.00 per 1,000, 54% complete, stored
- [PeopleSearch.im, free](https://datacircle.dev/company-discovery-apis/peoplesearch-im/free/llms.txt): $0.00 per 1,000, 38% complete, stored
- [AnVendor, free, POST /v1/leads/search](https://datacircle.dev/company-discovery-apis/anvendor/free-post-v1-leads-search/llms.txt): $0.00 per 1,000, 23% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-08.

- https://web.archive.org/web/20241001140156/https://www.rootdata.com/Api/Doc?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- https://web.archive.org/web/20251214201415/https://www.rootdata.com/Api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- https://web.archive.org/web/20251215063543/http://www.rootdata.com/disclaimer?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing