# Ambolt, free call a day, GET /v1/us-business-entities: Business verification API

> Look up US companies in official state business registers (Colorado, Connecticut, New York) or list newly formed entities by date: legal name, entity type, status, formation date, state of formation and city, with the source dataset. Official open data, one schema. Company level only: no registered agents, owners, officers, e-mail addresses or street addresses, trade names and sole proprietorships are excluded.

Ambolt's Free call a day plan for the business verification API costs $0.00 per 1,000 companies. Ambolt's docs list 5 of the 11 fields on our checklist: Registered name, Entity type, Status, Formation date, Principal address.
You get up to 30 calls a month.
We haven't run Ambolt through [our business verification API benchmark](https://datacircle.dev/best-business-verification-api.txt) yet.
This plan is free. We rank 1,165 plans for business verification APIs by price. Half the plans cost $8.182 or less per 1,000 companies. [See the best free business verification API plan.](https://datacircle.dev/best-business-verification-api.txt)
[CharityAPI's $15 monthly plan](https://datacircle.dev/business-verification-apis/charityapi/15-monthly-paid-get-api-organizations-ein/llms.txt) is the cheapest paid plan per 1,000 companies. CharityAPI's plan covers companies in the United States only. CharityAPI's $15 monthly plan charges nothing per call. You get as many companies as CharityAPI's rate limit allows. [ApiZero's CNY 399 yearly plan](https://datacircle.dev/business-verification-apis/apizero/cny-399-yearly-diamond-membership-get-api-company-search/llms.txt) costs the least for 10,000 companies a month: about $4.97.
[Scoris's €19 pack](https://datacircle.dev/business-verification-apis/scoris/19-pack/llms.txt) covers any number of companies in 8 countries only. Scoris's €19 pack costs more up front than CharityAPI's $15 monthly plan.
[GovFiles](https://datacircle.dev/business-verification-apis/govfiles/top-up/llms.txt), [Didit](https://datacircle.dev/business-verification-apis/didit/top-up-from-50/llms.txt) and [CompanyData.com](https://datacircle.dev/business-verification-apis/companydata-com/249-monthly/llms.txt) are the best business verification API providers in the Datacircle benchmark for companies in any country.

- This page: https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-us-business-entities
- [Business verification API: the 13 best providers compared](https://datacircle.dev/best-business-verification-api.txt)
- Get it: https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing
- Request: `GET https://api.ambolt.dev/v1/us-business-entities`
- API key: not needed
- Its API docs: https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing#/paths/~1v1~1us-business-entities
- Sold by: Ambolt (https://ambolt.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 45%
- Registered name: ✓
- Entity type: ✓
- Status: ✓
- Formation date: ✓
- Principal address: ✓ town or region

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Look up US companies in official state business registers (Colorado, Connecticut, New York) or list newly formed entities by date: legal name, entity type, status, formation date, state of formation and city, with the source dataset. Official open data, one schema. Company level only: no registered agents, owners, officers, e-mail addresses or street addresses, trade names and sole proprietorships are excluded.

## Data

- Countries: United States
- Keep data: no limit
- Use data: Do not use the services to attack or overload systems, to evade sanctions, or in breach of law. [...] Each developer-tool response names its source and licence. Where a source requires attribution, you must keep it when you reuse the data.

## Plan

- Pay: $0
- Enough for: 30 calls a month

## Rate limit

- Per day: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: nothing required. Optional: states, name, status, entityType, formedSince, formedUntil, limit, free
- Method: GET
- Path: /v1/us-business-entities

## About the plan

- Plan: Free call a day
- Who can get it: anyone, with no account or API key: one free call per tool and IP address per day

## The 7 fields the plan's answer can hold

legal name, entity type, status, formation date, state of formation, city, source dataset

## Ambolt's plans (2)

- [Ambolt, free call a day, GET /v1/us-business-entities](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-us-business-entities/llms.txt): $0.00 per 1,000, 45% complete
- [Ambolt, pay as you go, Pay per call with x402, GET /v1/us-business-entities](https://datacircle.dev/business-verification-apis/ambolt/pay-as-you-go-pay-per-call-with-x402-get-v1-us-business-entities/llms.txt): $20.00 per 1,000, 45% complete

## Ambolt's calls for this API (4)

- `GET /v1/entity-resolve`: [Ambolt, free call a day, GET /v1/entity-resolve](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-entity-resolve/llms.txt)
- `GET /v1/lei-lookup`: [Ambolt, free call a day, GET /v1/lei-lookup](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-lei-lookup/llms.txt)
- `GET /v1/nordic-company-lookup`: [Ambolt, free call a day, GET /v1/nordic-company-lookup](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-nordic-company-lookup/llms.txt)
- `GET /v1/us-business-entities`: [Ambolt, free call a day, GET /v1/us-business-entities](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-us-business-entities/llms.txt)

## Ambolt's APIs (6)

- [Ambolt: tech stack API pricing, 2 plans](https://datacircle.dev/company-technology-apis/ambolt/free/llms.txt)
- [Ambolt: domain WHOIS API pricing, 2 plans](https://datacircle.dev/domain-whois-apis/ambolt/free/llms.txt)
- [Ambolt: email verification API pricing, 2 plans](https://datacircle.dev/validate-email-apis/ambolt/free/llms.txt)
- [Ambolt: web scraping API pricing, 2 plans](https://datacircle.dev/web-scraping-apis/ambolt/free/llms.txt)
- [Ambolt: company enrichment API pricing, 2 plans, GET /v1/brazil-cnpj-lookup](https://datacircle.dev/company-enrichment-apis/ambolt/free-call-a-day-get-v1-brazil-cnpj-lookup/llms.txt)
- [Ambolt: company enrichment API pricing, 2 plans, GET /v1/eu-vat-validate](https://datacircle.dev/company-enrichment-apis/ambolt/free-call-a-day-get-v1-eu-vat-validate/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/us-business-entities](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-us-business-entities/llms.txt)

## Ambolt: business verification API alternatives

- [eucompliance.tools, pay as you go, Pay per call (x402), GET /x402/counterparty](https://datacircle.dev/business-verification-apis/eucompliance-tools/pay-as-you-go-pay-per-call-x402-get-x402-counterparty/llms.txt): $20.00 per 1,000, 0% complete, live
- [Anysite, $200 monthly, Growth, POST /api/dc/companies/search](https://datacircle.dev/business-verification-apis/anysite/200-monthly-growth-post-api-dc-companies-search/llms.txt): $20.00 per 1,000, 64% complete
- [Parse, $100 monthly, Developer, GET /scraper/8ceea6f9-34d2-4d7f-adf1-fc7bdd90b476/search_entities](https://datacircle.dev/business-verification-apis/parse/100-monthly-developer-get-scraper-8ceea6f9-34d2-4d7f-adf1-fc7bdd90b476-search-entities/llms.txt): $20.00 per 1,000, 55% complete, live
- [Aslan Group, pay as you go](https://datacircle.dev/business-verification-apis/aslan-group/pay-as-you-go/llms.txt): $20.00 per 1,000, 36% 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 2026-11-08.

- https://ambolt.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing
- https://ambolt.dev/licences?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing
- https://ambolt.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing
- https://ambolt.dev/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing
- https://ambolt.dev/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing
- https://api.ambolt.dev/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing
- https://api.ambolt.dev/catalog.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing
- https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=business-verification-api-pricing