# Canonical, free, POST /api/v1/search: Company discovery API

> Same engine as GET, plus structured mode: post a JSON body with description and/or typed filters to skip natural-language interpretation entirely.

Canonical's company discovery API on its Free plan. It costs $0.00 per 1,000 companies. Canonical's docs list 8 of the 13 fields on our checklist: Description, Industry, Type and status, Technologies, Employees, Headquarters, Funding, Revenue and budgets.
We haven't run Canonical through [our company discovery API benchmark](https://datacircle.dev/best-company-discovery-api.txt) yet.
This plan is free. We rank 899 plans for company discovery APIs by price. Half the plans cost $1.00 per 1,000 companies or less. [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.
[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/canonical/free-post-api-v1-search
- [Company discovery API: the best of 80+ providers compared](https://datacircle.dev/best-company-discovery-api.txt)
- Get it: https://trycanonical.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- Request: `POST https://trycanonical.ai/api/v1/search`
- API key: with the plan, on https://trycanonical.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- Its API docs: https://trycanonical.ai/documentation/reference?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing#tag/search/POST/api/v1/search
- Sold by: Canonical (https://trycanonical.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing)
- Checked: 2026-11-07

## In the answer

- Completeness: 62%
- Description: ✓
- Industry: ✓
- Type and status: ✓
- Technologies: ✓
- Employees: ✓
- Headquarters: ✓
- Funding: ✓ 1 day
- Revenue and budgets: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Search companies (natural language) · Look up companies by name · Find similar companies · Get company details · Find people · Look up people by name

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Same engine as GET, plus structured mode: post a JSON body with description and/or typed filters to skip natural-language interpretation entirely.

## Data

- Freshness: stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- Keep data: during the Subscription Term
- Use data: licence "to access and use the Service and Content solely for your internal personal or business use as expressly permitted by the Service". "You agree that you will not, and will not permit any third party to: copy, reproduce, modify, translate, adapt, create derivative works of, publicly display, publish, distribute, sell, sublicense or otherwise exploit any portion of the Service or the Content, except as expressly permitted by these Terms, redistribute, resell, lease, share, host or otherwise make available the Service or any Content (in original or derivative form) to or for the benefit of any third party, including by way of any service bureau, data feed, white-label or syndication arrangement, use the Service or Content to train, fine-tune, evaluate, benchmark or otherwise develop any artificial intelligence, machine learning or large language model, or to create any product or service that is competitive with the Service, scrape, crawl, harvest, index, mine or otherwise extract data or Content from the Service by automated or manual means, except via interfaces and to the extent expressly authorised by us in writing, [...] circumvent, disable, interfere with or attempt to bypass any security, authentication, rate-limiting, billing, usage tracking or access-control feature of the Service, [...] remove, obscure or alter any proprietary notice, attribution or branding contained in the Service or the Content"

## Plan

- Pay: $0
- You get: 250 credits
- Enough for: 250 results

## Rate limit

- Per day: 1,000
- Per second: 0.33
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: one of q, description or filters. Optional: top_k, intent, include_partials, exclude_company_domain, cursor, filters.location.cities, filters.location.states, filters.location.countries, filters.employee_count_min, filters.employee_count_max, filters.funding_series, filters.funding_min_usd, filters.funding_max_usd, filters.funding_post_money_min_usd, filters.funding_post_money_max_usd, filters.funded_after, filters.funded_before, filters.funding_investor, filters.people.has_repeat_founder, filters.people.has_technical_cofounder, filters.people.founder_prior_categories, filters.people.founder_prior_companies, filters.people.person.roles, filters.people.person.title_contains, filters.people.person.previously_at, filters.people.person.previous_title_contains, filters.jobs.hiring, filters.jobs.cities, filters.jobs.states, filters.jobs.countries, filters.jobs.departments, filters.jobs.levels, filters.exclude_company_domains, filters.exclude.description, filters.exclude.location.cities, filters.exclude.location.states, filters.exclude.location.countries, filters.exclude.funding_series, filters.exclude.funding_investor, filters.founding_year_min, filters.founding_year_max, filters.founding_year_exclude_min, filters.founding_year_exclude_max, filters.is_public
- Method: POST
- Path: /api/v1/search

## About the plan

- Plan: Free
- Who can get it: anyone aged 18 or over with the legal capacity to enter a binding contract, no card required

## The 29 fields the plan's answer can hold

name, website, domain, headquarters, employee count, founding year, public company, channel, industry, offering, offering type, revenue model, business model, offering domain, target customer, business category, technology application, total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors, description, match verdict, match verdict reason, interpreted criteria

## Canonical's plans (7)

- [Canonical, free, POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/free-post-api-v1-search/llms.txt): $0.00 per 1,000, 62% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, top-up, Extra credits (Pro), POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/top-up-extra-credits-pro-post-api-v1-search/llms.txt): $8.00 per 1,000, 62% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, top-up, Extra credits (Starter), POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/top-up-extra-credits-starter-post-api-v1-search/llms.txt): $10.00 per 1,000, 62% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, top-up, Extra credits (Lite), POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/top-up-extra-credits-lite-post-api-v1-search/llms.txt): $15.00 per 1,000, 62% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, $10 monthly, Lite, POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/10-monthly-lite-post-api-v1-search/llms.txt): $15.015 per 1,000, 62% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, $20 monthly, Starter, POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/20-monthly-starter-post-api-v1-search/llms.txt): $10.00 per 1,000, 62% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, $100 monthly, Pro, POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/100-monthly-pro-post-api-v1-search/llms.txt): $8.00 per 1,000, 62% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)

## Canonical's calls for this API (3)

- `POST /api/v1/lookup`: [Canonical, free, POST /api/v1/lookup](https://datacircle.dev/company-discovery-apis/canonical/free-post-api-v1-lookup/llms.txt)
- `GET /api/v1/search`: [Canonical, free, GET /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/free-get-api-v1-search/llms.txt)
- `POST /api/v1/search`: [Canonical, free, POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/free-post-api-v1-search/llms.txt)

## Canonical's APIs (5)

- [Canonical: company enrichment API pricing, 7 plans](https://datacircle.dev/company-enrichment-apis/canonical/free/llms.txt)
- [Canonical: company hierarchy API pricing, 7 plans](https://datacircle.dev/company-hierarchy-apis/canonical/free/llms.txt)
- [Canonical: similar companies API pricing, 7 plans](https://datacircle.dev/similar-company-apis/canonical/free/llms.txt)
- [Canonical: people search API pricing, 7 plans, POST /api/v1/people/search](https://datacircle.dev/people-search-apis/canonical/free-post-api-v1-people-search/llms.txt)
- [Canonical: people search API pricing, 7 plans, POST /api/v1/people/lookup](https://datacircle.dev/people-search-apis/canonical/free-post-api-v1-people-lookup/llms.txt)
- [Canonical: company discovery API pricing, 7 plans, POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/free-post-api-v1-search/llms.txt)

## Canonical: company discovery API alternatives

- [Village, $25 pack](https://datacircle.dev/company-discovery-apis/village/25-pack/llms.txt): $7.50 per 1,000, 38% complete, stored
- [Parsers VC, $79 monthly, Growth, GET /funds, List funds, full](https://datacircle.dev/company-discovery-apis/parsers-vc/79-monthly-growth-get-funds-list-funds-full/llms.txt): $7.90 per 1,000, 62% complete, stored
- [StoreInspect, $2,388 yearly](https://datacircle.dev/company-discovery-apis/storeinspect/2388-yearly/llms.txt): $7.96 per 1,000, 15% complete, stored
- [The Swarm, $5,000 yearly, Premium 1000, POST /v3/companies/fetch](https://datacircle.dev/company-discovery-apis/the-swarm/5000-yearly-premium-1000-post-v3-companies-fetch/llms.txt): $8.333 per 1,000, 77% 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 2026-11-07.

- https://trycanonical.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- https://trycanonical.ai/api/v1/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- https://trycanonical.ai/documentation/rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- https://trycanonical.ai/documentation/reference?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- https://trycanonical.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- https://trycanonical.ai/refund-policy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing
- https://trycanonical.ai/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=company-discovery-api-pricing