# Karma.Domains Karma Metric Checker

> Karma.Domains Karma Metric Checker is a paid API for AI agents from api.karma.domains, paid per call via x402, $1.5/call, status unknown (last checked 2026-09-14).

Returns the proprietary Karma Metric score for a given domain name, reflecting its overall quality and authority

## Facts

- Endpoint: GET https://api.karma.domains/v1/domains/checker/karma_metric
- Price: $1.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/karma-domains-karma-metric-checker-dc2d55d2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gCSyZP-qX_v0tTr2o6Erp

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 karma-domains-karma-metric-checker-dc2d55d2
```

Example prompt: What's the Karma Metric score for brandablewidgets.com? I want to know how good this domain is before I bid on it.

## When to prefer this

Use this endpoint when you need a single proprietary quality/authority score for a domain name — particularly when evaluating domains in auctions, expired lists, or buy-now markets. Prefer this over generic SEO tools when you specifically want Karma.Domains' own composite 'Karma Metric' score rather than third-party DA/PA metrics.

## Known failure modes

- Missing or invalid domain query parameter returns 400 Bad Request
- Unauthenticated request returns HTTP 402 with PAYMENT-REQUIRED header requiring x402 payment retry
- Exceeding 60 requests/minute returns HTTP 429 with Retry-After header
- Exceeding 50,000 daily row quota returns quota-exceeded error
- Rate-limit storage unavailable returns HTTP 503
- Domain not found or unscored may return score of 0 with null period

## How this service works

Public API for Karma.Domains: programmatic access to domain intelligence — reports across auctions, expired, backorder, and buy-now inventories, SEO and authority metrics, Wayback history, availability checks, and Karma Metric. Use it to search, filter, and automate the same data workflows as the Karma.Domains web app.

**Authentication:** `Authorization: Bearer <api_key>` (Pro subscription or agent credits).
**Agent credits (x402):** HTTP 402 + `PAYMENT-REQUIRED` when unauthenticated; retry same URL with `PAYMENT-SIGNATURE` and optional `X-Karma-Plan-Id`.

**Rate limits:** 60 requests per minute per API key (all endpoints share one counter). Response headers: `X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Reset`. On exceed: HTTP 429 with `Retry-After`. If rate-limit storage is unavailable: HTTP 503.

**Row quota:** 50,000 list rows per day per account (UTC reset). List responses include `X-Quota-Limit`, `X-Quota-Remaining`, `X-Quota-Reset`. Pagination: `page_size` 1–100 (Public API); `page × page_size ≤ 5000`.

## Output

Returns a JSON object with the domain name, its numerical Karma Metric score (0-based), and an optional period field indicating the scoring window. The score reflects the domain's overall quality, authority, and desirability as assessed by Karma.Domains' proprietary algorithm.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "example": "example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "score": 0,
  "domain": "example.com",
  "period": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/karma-domains-karma-metric-checker-dc2d55d2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.karma.domains](https://www.zero.xyz/host/api.karma.domains/llms.txt)