# Similar Domains Finder DomainScope (`domainscope/domainscope-similar-domains-finder`) Actor

Find similar/competitor domains for a list of anchor domains using DomainScope's embedding-based nearest-neighbour search.

- **URL**: https://apify.com/domainscope/domainscope-similar-domains-finder.md
- **Developed by:** [Florin Badita](https://apify.com/domainscope) (community)
- **Categories:** Lead generation
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

$3.00 / 1,000 similar domain returneds

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-event

## What's an Apify Actor?

Actors are web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
- **Agentic workflows and local Actor development** — [Agent Skills](https://apify.com/.well-known/agent-skills/index.json) with the [Apify CLI](https://docs.apify.com/cli/docs.md): `npm install -g apify-cli`, then `apify login`.
- **JavaScript/TypeScript projects** — the official [JS/TS client](https://docs.apify.com/api/client/js/docs.md): `npm install apify-client`.
- **Python projects** — the official [Python client](https://docs.apify.com/api/client/python/docs.md): `pip install apify-client`.
- **Any other language** — the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).

# README

## DomainScope Similar Domains Finder — Apify Actor

Find similar/competitor domains for a list of anchor domains, via
`GET /api/v1/domains/{url}/similar` — public, no DomainScope account or
API key required. Uses HNSW/cosine nearest-neighbour search over
DomainScope's stored domain embeddings.

### Coverage caveat — embeddings are not computed for every domain

Embedding coverage across the ~12M-domain corpus is **partial**: it's
populated per-domain only when explicitly triggered (via
`POST /search/update-embedding` or an internal backfill job), not
automatically on categorization. An anchor with no embedding on file
returns `anchor_not_embedded` rather than a 500, so this Actor reports it
as a clean per-anchor `error` ("No similar domains found...") instead of
failing the whole run — but expect some anchors, especially newer or less
mainstream domains, to come back empty.

### Input

See [`.actor/input_schema.json`](.actor/input_schema.json):

- **`domains`** (required) — anchor domains to find neighbours for.
- **`k`** — max neighbours per anchor (default 20, ceiling 100).
- **`minScore`** — cosine similarity floor, 0–1 (default 0, no floor).

### Output

One dataset row per `(anchor, similar domain)` pair: `anchor`, `url`,
`score`, `industry`, `country`, `business_model`, `category`,
`shared_signals`. Anchors with no results get a single row with an
`error` field instead, and are not charged.

### Billing

Charges one `similar-domain-returned` event per neighbour delivered (not
per anchor) — the value delivered is the result rows. `Actor.charge()` is
a documented no-op outside a pay-per-event-enabled run, so local
development works without any billing setup.

### Local development

```bash
npm install
echo '{"domains": ["asana.com"], "k": 10}' \
  > storage/key_value_stores/default/INPUT.json
npm run start:dev
```

Or: `apify run --input '{"domains": ["asana.com"]}'`

### Deploying

```bash
apify login
apify push
```

# Actor input Schema

## `domains` (type: `array`):

Domains to find neighbours for, e.g. "stripe.com". Each anchor must already have a computed embedding on DomainScope — coverage is partial across the corpus, so some anchors may return no results (see "No similar domains found" in the error field).

## `k` (type: `integer`):

Max similar domains to return per anchor.

## `minScore` (type: `number`):

Cosine similarity floor, 0 to 1. 0 means no floor.

## `apiKey` (type: `string`):

Not required — GET /domains/{url}/similar is public. Provide a key only if you have one and want calls attributed to your DomainScope account.

## `apiBaseUrl` (type: `string`):

Base URL of the DomainScope API, including the /api/v1 path. Change only for staging/testing.

## Actor input object example

```json
{
  "domains": [
    "asana.com"
  ],
  "k": 20,
  "minScore": 0,
  "apiBaseUrl": "https://domainscope.scrapetheworld.org/api/v1"
}
```

# Actor output Schema

## `similarDomains` (type: `string`):

No description

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "domains": [
        "asana.com"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("domainscope/domainscope-similar-domains-finder").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "domains": ["asana.com"] }

# Run the Actor and wait for it to finish
run = client.actor("domainscope/domainscope-similar-domains-finder").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "domains": [
    "asana.com"
  ]
}' |
apify call domainscope/domainscope-similar-domains-finder --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,domainscope/domainscope-similar-domains-finder"
        }
    }
}

```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/S0TiGt01SsQJ6cNb5/builds/OyUwlN7MEeGp3XN6b/openapi.json