# Similarweb SimilarSites API

> Get websites similar to a domain, with affinity score, category and global rank. The date range must span exactly 3 months.

Source: https://www.sandbase.ai/apis/similarweb/similar-sites
API reference: https://www.sandbase.ai/apis/similarweb/similar-sites/docs

## Facts

- Provider: Similarweb
- Type: Data API
- Endpoint: `POST https://api.sandbase.ai/v1/api/similarweb/similar-sites`
- Price: From $0.38 per call
- Capabilities: api, similarweb, web analytics
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

`POST https://api.sandbase.ai/v1/api/similarweb/similar-sites` with `Authorization: Bearer $SANDBASE_API_KEY` and the parameters as a JSON body.

| Parameter | Type | Required | Allowed values |
| --- | --- | --- | --- |
| `domain` | string | yes |  |
| `end_date` | string | yes |  |
| `limit` | integer | yes |  |
| `start_date` | string | yes |  |
| `country` | string | no | ww |
| `granularity` | string | no | monthly |
| `main_domain_only` | boolean | no |  |
| `offset` | integer | no |  |
| `traffic_source` | string | no |  |
| `web_source` | string | no | desktop, mobile_web, total |

## FAQ

### How do I use the Similarweb SimilarSites API?

Send a POST request to https://api.sandbase.ai/v1/api/similarweb/similar-sites with your SandBase API key in the Authorization header (Bearer) and the parameters as a JSON body. You can also try it in the Playground on this page without writing code.

### How much does the Similarweb SimilarSites API cost?

From $0.38 per call, billed from your SandBase balance. You are only charged for calls you make; there is no subscription.

### What parameters does the Similarweb SimilarSites API accept?

Required: domain (string), end_date (string), limit (integer) and start_date (string). Optional: country (one of ww), granularity (one of monthly), main_domain_only (boolean), offset (integer), traffic_source (string) and web_source (one of desktop, mobile_web, total). The Parameters table and the Playground on this page list every field.

### What does the Similarweb SimilarSites API return?

A JSON response returned in the same HTTP request (synchronous).

### Do I need a Similarweb developer account or API key?

No. Similarweb SimilarSites runs through SandBase, so one SandBase API key covers this endpoint and every other API and model in the catalog. You do not need to apply for Similarweb API access separately.

## README

### Similarweb SimilarSites API

Get websites similar to a domain, with affinity score, category and global rank. The date range must span exactly 3 months.

The response is the official Similarweb API response, unchanged.

#### Request

```bash
curl -X POST "https://api.sandbase.ai/v1/run" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "similarweb/similar-sites", "domain": "cnn.com", "start_date": "2026-07", "end_date": "2026-09", "limit": 1}'
```

#### Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `country` | string | No | Worldwide data only; values are case-insensitive. |
| `domain` | string | Yes | domain |
| `end_date` | string | Yes | End month (YYYY-MM). The range must span exactly 3 months, e.g. 2026-07 to 2026-09. |
| `granularity` | string | No | granularity |
| `limit` | integer | Yes | limit |
| `main_domain_only` | boolean | No | main_domain_only |
| `offset` | integer | No | offset |
| `start_date` | string | Yes | Start month (YYYY-MM). The range must span exactly 3 months, e.g. 2026-07 to 2026-09. |
| `traffic_source` | string | No | traffic_source |
| `web_source` | string | No | web_source |

#### Pricing

$0.375 per returned row (5 Similarweb credits), up to 20 rows; billed on rows returned. Failed calls are not charged.