# SignalSumo, $99 monthly: Domain authority API

> Returns a domain's backlink profile: a summary overview, distribution insights, and an enriched list of individual backlinks.

SignalSumo's "Pro — monthly" plan for the domain authority API costs $4,950.00 per 1,000 domains. We check each provider's docs for 5 fields. SignalSumo's docs list all 5: Authority score, Spam score, Backlinks, Referring domains, Referring pages.
We haven't run SignalSumo through [our domain authority API benchmark](https://datacircle.dev/best-domain-authority-api.txt) yet.
We rank 252 plans for domain authority APIs by price. Half the plans cost $4.95 or less per 1,000 domains. This plan has the highest price per 1,000 domains of the 252 plans.
[Morningscore's $69 monthly plan](https://datacircle.dev/domain-authority-apis/morningscore/69-monthly/llms.txt) is the cheapest paid plan per 1,000 domains. Morningscore's domain authority API costs nothing beyond the plan price. [Pixel Tools' ₽99 pack](https://datacircle.dev/domain-authority-apis/pixel-tools/99-pack/llms.txt) costs the least for 10,000 domains a month: about $1.18.
[BacklinkMCP's $19 monthly plan](https://datacircle.dev/domain-authority-apis/backlinkmcp/19-monthly/llms.txt) covers any number of domains, and costs less up front than Morningscore's $69 monthly plan.
[AnyAPI](https://datacircle.dev/domain-authority-apis/anyapi/top-up-from-10-manual-top-up-post-v1-run-semrush-overview/llms.txt), [host.io](https://datacircle.dev/domain-authority-apis/host-io/99-monthly/llms.txt) and [SearcherLite](https://datacircle.dev/domain-authority-apis/searcherlite/297-pack/llms.txt) are the best domain authority API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-authority-apis/signalsumo/99-monthly
- [Domain authority API: domain rank providers compared](https://datacircle.dev/best-domain-authority-api.txt)
- Get it: https://signalsumo.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- Request: `GET https://signalsumo.com/api/v1/backlinks`
- API key: with the plan, on https://signalsumo.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- Its API docs: https://signalsumo.com/api-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- Sold by: SignalSumo (https://signalsumo.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing)
- Checked: 2026-11-12

## In the answer

- Completeness: 100%
- Authority score: ✓
- Spam score: ✓
- Backlinks: ✓
- Referring domains: ✓
- Referring pages: ✓

## Price

- $ per 1,000 domains: $4,950.00
- Per: call
- Billing: monthly
- $ a month: $99

## Charges

- Also pays for: from the same budget: GET Usage · POST Keywords · POST Site Audit · GET Jobs · GET Tracked Keywords · GET Rank History · GET GSC Properties · GET GSC Queries · GET AI Projects · GET Share of Voice · GET Locations

## Overage

- Units cap: hard

## Not found

- $ per 1,000 calls that find nothing: $4,950.00

## In their words

- Their pitch: Returns a domain's backlink profile: a summary overview, distribution insights, and an enriched list of individual backlinks.

## Data

- Freshness: 2 days
- Keep data: no limit
- Use data: The reports, analysis outputs, and data exports generated by the Platform for your account are yours to use for your own business purposes. You may not resell or redistribute Platform outputs as a standalone data product without our express written consent. [...] You must not: [...] Share account credentials with third parties or resell access to the Platform without authorisation. [...] Use any output from the Platform to engage in spam, phishing, or other deceptive practices.

## Plan

- Pay: $99
- You get: 20 requests a month
- Enough for: 20 calls a month
- Expires: 1st of each month

## Rate limit

- Per second: 0.33 (20 a minute)
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain. Optional: page, limit
- Method: GET
- Path: /backlinks

## About the plan

- Plan: Pro — monthly
- Who can get it: anyone at least 18 years old and able to form a binding contract

## The 20 fields the plan's answer can hold

domain, domain rank, total backlinks, referring domains, referring domains nofollow, referring main domains, referring pages, referring IP addresses, referring subnets, dofollow backlinks, broken backlinks, broken pages, spam score, first seen, lost date, referring link types, referring link attributes, referring link platform types, referring link TLDs, referring link countries

## SignalSumo's plans (4)

- [SignalSumo, $99 monthly](https://datacircle.dev/domain-authority-apis/signalsumo/99-monthly/llms.txt): $4,950.00 per 1,000, 100% complete, 2 days
- [SignalSumo, $249 monthly](https://datacircle.dev/domain-authority-apis/signalsumo/249-monthly/llms.txt): $2,490.00 per 1,000, 100% complete, 7 days
- [SignalSumo, $990 yearly](https://datacircle.dev/domain-authority-apis/signalsumo/990-yearly/llms.txt): $4,125.00 per 1,000, 100% complete, 2 days
- [SignalSumo, $2,499 yearly](https://datacircle.dev/domain-authority-apis/signalsumo/2499-yearly/llms.txt): $2,082.50 per 1,000, 100% complete, 7 days

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

- `GET /backlinks`: [SignalSumo, $99 monthly](https://datacircle.dev/domain-authority-apis/signalsumo/99-monthly/llms.txt)

## SignalSumo's APIs (4)

- [SignalSumo Backlink API pricing, 4 plans](https://datacircle.dev/backlink-apis/signalsumo/99-monthly/llms.txt)
- [SignalSumo Domain authority API pricing, 4 plans](https://datacircle.dev/domain-authority-apis/signalsumo/99-monthly/llms.txt)
- [SignalSumo Keyword research API pricing, 4 plans](https://datacircle.dev/keyword-research-apis/signalsumo/99-monthly/llms.txt)
- [SignalSumo Related keywords API pricing, 4 plans](https://datacircle.dev/related-keywords-apis/signalsumo/99-monthly/llms.txt)

## SignalSumo: domain authority API alternatives

[SignalSumo alternatives: other domain authority API providers by price](https://datacircle.dev/signalsumo-alternatives.txt)

We list other providers' plans closest to this plan in price per 1,000 domains. Each plan in the list gives live data or data at most a week old.

- [UnblockingAPI, €10 pack](https://datacircle.dev/domain-authority-apis/unblockingapi/10-pack/llms.txt): $1.125 per 1,000, 60% complete, live
- [ScrapeWhale, $9.90 pack](https://datacircle.dev/domain-authority-apis/scrapewhale/9-90-pack/llms.txt): $9.90 per 1,000, 20% complete, 24 hours
- [DR Checker, $15 monthly, Pro, POST /api/tools/authority-score](https://datacircle.dev/domain-authority-apis/dr-checker/15-monthly-pro-post-api-tools-authority-score/llms.txt): $75.00 per 1,000, 40% complete, 7 days
- [Local SEO Data, top-up from $5](https://datacircle.dev/domain-authority-apis/local-seo-data/top-up-from-5/llms.txt): $115.00 per 1,000, 80% complete, 7 days

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-12.

- https://signalsumo.com/api-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://signalsumo.com/page/terms-of-use?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing
- https://signalsumo.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-authority-api-pricing