# true402 Backlink Analysis API

> true402 Backlink Analysis API is a paid API for AI agents from true402.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Returns backlink intelligence for a domain or URL, including authority rank, referring domains, dofollow links, spam score, and link composition breakdown.

## Facts

- Endpoint: POST https://true402.dev/api/v1/backlinks
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/true402-backlink-analysis-api-6965092f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5ejlLox8WI5WO1jPRH_3J

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability true402-backlink-analysis-api-6965092f -d '<json body>'
```

Example prompt: Can you pull up the backlink profile for ahrefs.com — I want to see the authority rank, how many referring domains it has, the dofollow link count, and whether the spam score is high?

## When to prefer this

Choose this endpoint when you need machine-payable, per-call backlink intelligence without API key registration — ideal for AI agents using x402/HTTP 402 micropayment flows. Best for spot-checks on individual domains or URLs where you want authority rank, dofollow link counts, spam score, and geographic/TLD composition in a single call. Prefer it over subscription-based SEO tools when operating in agentic pipelines that handle crypto wallet payments natively.

## Known failure modes

- Domain has no index data — 'observed: false' returned with zeroed metrics
- Invalid or malformed URL/domain in target field — likely 400 error
- Payment not attached or insufficient — HTTP 402 returned, requires x402-compatible wallet
- Rate limits or quota issues on the underlying backlink index
- Recently registered domain with no crawled backlink history yet

## How this service works

The machine-native marketplace. Wallet = identity. Pay per call with HTTP 402.

## Output

Returns a JSON object with: authority rank (0–1000), number of backlinks, number of referring domains, dofollow object with referringDomains and referringPages counts, spam score (0–100), link composition breakdown (TLD, link types, attributes, countries), and an 'observed' boolean indicating whether index data exists for the domain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "target"
 ],
 "properties": {
  "target": {
   "type": "string",
   "description": "Domain, or any URL on it"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rank": {
   "type": "number",
   "description": "Authority rank, 0-1000"
  },
  "target": {
   "type": "string"
  },
  "dofollow": {
   "type": "object",
   "description": "{ referringDomains, referringPages } — the links that carry authority"
  },
  "observed": {
   "type": "boolean",
   "description": "false when the index holds no data for this domain"
  },
  "backlinks": {
   "type": "number"
  },
  "spamScore": {
   "type": "number",
   "description": "0-100"
  },
  "composition": {
   "type": "object",
   "description": "{ tld, linkTypes, attributes, countries }"
  },
  "referringDomains": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/true402-backlink-analysis-api-6965092f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from true402.dev](https://www.zero.xyz/host/true402.dev/llms.txt)