# host.io, free: Domain authority API

> We analysed all the domains in our database, ranked them according to their backlinks, hosting details, domain details and some secret sauce.

host.io's domain authority API on its Free plan. It costs $0.00 per 1,000 domains. It returns none of the 5 key fields we check: Authority score, Spam score, Backlinks, Referring domains and Referring pages.
We haven't run host.io through [our domain authority API benchmark](https://datacircle.dev/best-domain-authority-api.txt) yet.
This plan is free. We rank 129 plans for domain authority APIs by price. Half the plans cost $3.98 per 1,000 domains or less.
[DataForSEO's top-up from $50](https://datacircle.dev/domain-authority-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-backlinks-bulk-ranks-live/llms.txt) is the cheapest paid plan per 1,000 domains: $0.036.
[AnyAPI](https://datacircle.dev/domain-authority-apis/anyapi/top-up-from-10-manual-top-up-post-v1-run-semrush-overview/llms.txt), [SE Ranking](https://datacircle.dev/domain-authority-apis/se-ranking/29-monthly-add-on-monthly-billing-get-v1-backlinks-authority-domain/llms.txt) and [DataForSEO](https://datacircle.dev/domain-authority-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-backlinks-bulk-ranks-live/llms.txt) are the best domain authority API providers in our benchmark.

- This page: https://datacircle.dev/domain-authority-apis/host-io/free
- [Domain authority API: 4 providers compared on price and data](https://datacircle.dev/best-domain-authority-api.txt)
- Get it: https://host.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- Request: `GET https://host.io/api/web/{domain}`
- API key: with the plan, on https://host.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- Its API docs: https://host.io/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- Sold by: host.io (https://host.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing)
- Checked: 2026-11-04

## In the answer

- Completeness: 0%

## Price

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

## Charges

- Also pays for: from the same budget: /api/dns/:domain · /api/related/:domain · /api/full/:domain · /api/domains/:field/:value

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: We analysed all the domains in our database, ranked them according to their backlinks, hosting details, domain details and some secret sauce.

## Data

- Freshness: 1 month
- Keep data: no limit
- Use data: "When using a free version of the Services, this license is strictly limited to your personal, non-commercial use, in the manner permitted by these Terms." "You may not (and you may not permit anyone else to): (i) copy, modify, create a derivative work of, reverse engineer, decompile or otherwise attempt to extract the source code of the Services or any part thereof, unless this is expressly permitted or required by law, or unless you have been specifically told that you may do so by Host.io, in writing (e.g., through an open source software license), or (ii) attempt to disable or circumvent any security mechanisms used by the Services or any applications running on the Services." "You may not engage in any activity that interferes with or disrupts the Services (or the servers and networks which are connected to the Services)." "You may not access the Services in a manner intended to avoid incurring fees or exceeding usage limits or quotas." "You may not access the Services for the purpose of bringing an intellectual property infringement claim against Host.io or for the purpose of creating a product or service competitive with the Services. You may not use any robot, spider, site search/retrieval application or other manual or automatic program or device to retrieve, index, “scrape,” “data mine” or in any way gather Content from the Services. You may not use the Services to assemble email lists for the purposes of sending out mass emails or “spam.” You may not access the Services for the purpose of collecting Content for sale or resale without the express written consent of Host.io." (Terms of Service, host.io/terms)

## Plan

- Pay: $0
- You get: 1,000 requests a month
- Enough for: 1,000 calls a month

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain
- Method: GET
- Path: /api/web/{domain}

## About the plan

- Plan: Free
- Who can get it: anyone over 13 years of age

## The 11 fields the plan's answer can hold

domain, rank, URL, IP address, scraped at, content length, encoding, copyright notice, title, description, linked domains

## host.io's plans (4)

- [host.io, free](https://datacircle.dev/domain-authority-apis/host-io/free/llms.txt): $0.00 per 1,000, 0% complete, 1 month
- [host.io, $99 monthly](https://datacircle.dev/domain-authority-apis/host-io/99-monthly/llms.txt): $9.90 per 1,000, 0% complete, 1 month
- [host.io, $499 monthly](https://datacircle.dev/domain-authority-apis/host-io/499-monthly/llms.txt): $4.99 per 1,000, 0% complete, 1 month
- [host.io, contact us](https://datacircle.dev/domain-authority-apis/host-io/contact-us/llms.txt): $1.998 per 1,000, 0% complete, 1 month

## host.io's calls for this API (1)

- `GET /api/web/{domain}`: [host.io, free](https://datacircle.dev/domain-authority-apis/host-io/free/llms.txt)

## host.io's APIs (2)

- [host.io: backlink API pricing, 4 plans](https://datacircle.dev/backlink-apis/host-io/free/llms.txt)
- [host.io: domain authority API pricing, 4 plans](https://datacircle.dev/domain-authority-apis/host-io/free/llms.txt)

## host.io: domain authority API alternatives

- [Omkar Cloud, $16 monthly, Starter Plan, GET /domains/authority, Domain Authority](https://datacircle.dev/domain-authority-apis/omkar-cloud/16-monthly-starter-plan-get-domains-authority-domain-authority/llms.txt): $0.80 per 1,000, 60% complete, live
- [SE Ranking, top-up from $50, Wallet, GET /v1/backlinks/authority/domain](https://datacircle.dev/domain-authority-apis/se-ranking/top-up-from-50-wallet-get-v1-backlinks-authority-domain/llms.txt): $1.00 per 1,000, 20% complete, 1 month

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-04.

- https://host.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://host.io/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://host.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://host.io/rankings?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://host.io/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://support.host.io/hc/en-us/articles/33021412411922-What-is-the-usage-limit-for-users-on-the-free-plan?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://support.host.io/hc/en-us/articles/33021424371474-What-happens-if-I-exceed-my-rate-limit?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://support.host.io/hc/en-us/articles/33021424850194-How-does-host-io-domain-ranking-works?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://support.host.io/hc/en-us/articles/33021428241810-How-often-do-you-update-your-data?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing