Operated by Sourcelane✓ verified
Find websites that link to your competitors but not to you. Get a ranked list of link-building prospects with domain rank, spam score and backlink counts.
Backlink Gap Finder identifies websites that link to competitors but not to your site, producing a ranked list of link-building prospects for outreach and SEO research. It computes link intersections across multiple competitor domains to surface referring domains prioritized by site strength and backlink impact; it assigns numeric authority and spam scores (0–100), counts backlinks and dofollow backlinks that each prospect provides to competitors, indicates how many and which competitors a prospect links to versus missing from your site, classifies site platform type (blog, news, ecommerce, forum, organization, etc.), and provides a first-seen timestamp for each prospect. The connector supports configurable intersection depth (e.g., sites linking to all competitors or to a subset), filtering by strength and spam thresholds, and limits on the number of prospects returned, enabling targeted prospect ranking for link outreach and competitive backlink analysis.
Verified Oct 25, 10:11 PM
$0.001
per link prospect
Up to 100 per call. Only pay for results returned; failed calls are refunded.
Link building outreach
Identify sites already linking to several competitors as outreach targets
Competitor backlink analysis
Discover publications, directories and blogs linking to competitors
Digital PR
Find journalists' sites and niche roundups covering your topic
SEO agency prospecting
Generate link-gap reports for clients
Guest post and directory lists
Filter prospects by site type and authority to build target lists
Competitor websites, one per line.
Your own website.
Optional settings
| Window | Uptime | Success rate | p50 | p95 | Calls |
|---|---|---|---|---|---|
| 24h | — | — | — | — | 0 |
| 7d | — | — | — | — | 0 |
| 30d | — | — | — | — | 0 |
Call it through Sourcelane's gateway or MCP server. We run the connector, apply your agent's spend guardrails, and bill only the results returned.
Call it via Sourcelane
curl -X POST https://api.usesourcelane.com/v1/call \
-H "Authorization: Bearer sl_live_your_agent_key" \
-H "Content-Type: application/json" \
-d '{"listing":"backlink-gap-finder","params":{"competitors":["ahrefs.com","semrush.com"],"maxResults":5},"maxResults":10}'Request params
| Field | Type | Required | Description |
|---|---|---|---|
competitors | array | required | Competitor websites, one per line (2 to 20 work best). The connector finds sites linking to these competitors. |
yourDomains | array | optional | Your own website(s). Sites that already link to you are left out, so only new prospects remain. Leave empty to see every shared linking domain. |
match | string | optional | With 3 or more competitors: only sites linking to all of them (fewest, strongest prospects), or sites linking to at least 2 of them (more prospects). |
minDomainRank | integer | optional | Only include linking sites with a domain rank (0-100) at or above this value. 0 includes everything. |
maxSpamScore | integer | optional | Leave out linking sites with a spam score (0-100) above this value. 100 includes everything; 30 is a good cut-off for outreach lists. |
dofollowOnly | boolean | optional | Only include sites that give competitors at least one dofollow link. |
maxResults | integer | optional | Maximum linking domains to return, strongest first. Up to 20,000. Capped at 100 per call. |
Each result contains
| Field | Type | Description |
|---|---|---|
referringDomain | string | Linking Domain |
domainRank | integer | Domain Rank |
spamScore | integer | Spam Score |
competitorsLinked | integer | Competitors Linked |
linksTo | array | Links To |
missingFrom | array | Not Linking To |
backlinksToCompetitors | integer | Backlinks |
dofollowBacklinksToCompetitors | integer | — |
backlinksByCompetitor | object | — |
dofollow | boolean | Dofollow |
platformTypes | array | Site Type |
firstSeen | string | First Seen |
yourDomains | array | — |
url | string | — |
scrapedAt | string | — |
Pick your tool and connect in under a minute. Then just ask — for example: “For these 50 domains, find contact emails and what e-commerce platform they run on.”
Connect Claude
Web, desktop and mobile. One click, then confirm.
Adds the Sourcelane MCP server with your key as a header.
claude mcp add --transport http sourcelane https://api.usesourcelane.com/mcp \
--header "Authorization: Bearer sl_live_your_agent_key"Alternative to the connector URL: add to claude_desktop_config.json, then restart Claude.
{
"mcpServers": {
"sourcelane": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://api.usesourcelane.com/mcp",
"--header",
"Authorization:${AUTH_HEADER}"
],
"env": {
"AUTH_HEADER": "Bearer sl_live_your_agent_key"
}
}
}
}Add to ~/.cursor/mcp.json (or Windsurf's mcp_config.json).
{
"mcpServers": {
"sourcelane": {
"url": "https://api.usesourcelane.com/mcp",
"headers": {
"Authorization": "Bearer sl_live_your_agent_key"
}
}
}
}Save as .vscode/mcp.json. VS Code prompts for your key once.
{
"servers": {
"sourcelane": {
"type": "http",
"url": "https://api.usesourcelane.com/mcp",
"headers": {
"Authorization": "Bearer ${input:sourcelane-key}"
}
}
},
"inputs": [
{
"type": "promptString",
"id": "sourcelane-key",
"description": "Sourcelane agent key",
"password": true
}
]
}Create a GPT → Actions → Import from URL, then Authentication: API Key, Bearer.
https://usesourcelane.com/openapi.jsonOne POST. Pass maxResults to cap cost.
curl -X POST https://api.usesourcelane.com/v1/call \
-H "Authorization: Bearer sl_live_your_agent_key" \
-H "Content-Type: application/json" \
-d '{"listing":"backlink-gap-finder","params":{"competitors":["ahrefs.com","semrush.com"],"maxResults":5},"maxResults":10}'Wrap the REST call as a tool, or point an MCP client at the endpoint.
import requests
res = requests.post(
"https://api.usesourcelane.com/v1/call",
headers={"Authorization": "Bearer sl_live_your_agent_key"},
json={
"listing": "backlink-gap-finder",
"params": {"competitors":["ahrefs.com","semrush.com"],"maxResults":5},
"maxResults": 10,
},
timeout=300,
)
body = res.json()
print(body["receipt"]["chargedMicros"], "micro-USD for", body["receipt"]["results"], "results")
print(body["data"])—
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