# Google Scholar Author API

Give an author_id, get their articles, h-index, and citation history.

- endpoint: `GET https://marketplaceforaiagents.com/api/public/v1/google-scholar-author`
- category: academic
- price: $0.005 USDC per call (5000 atomic, 6 decimals)
- free tier: 3 calls per agent identity, shared across all endpoints (unknown/generic clients draw from a site-wide 100 successful free calls per UTC day; crawlers get none)
- settlement: USDC on Base mainnet `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`, payee `0x05e82e03753c7bc99fb24d10a876cce53f24b7b7`, scheme `exact`
- sandbox: append `?network=base-sepolia` for testnet USDC + mock data
- results key: `articles`
- html: https://marketplaceforaiagents.com/listings/google-scholar-author

## What it returns

Full publication list and citation metrics for a specific Scholar author ID.

## Use cases

- Assess an expert's credibility
- Track a lab's publication output

## Parameters

| param | type | required | default | description |
| --- | --- | --- | --- | --- |
| `author_id` | string | yes | — | Google Scholar author ID |
| `hl` | string | no | en | UI/interface language code |

## Example call

```bash
curl -s "https://marketplaceforaiagents.com/api/public/v1/google-scholar-author?author_id=example"
```

## Response shape

```json
{
  "search_metadata": {
    "id": "search_...",
    "status": "Success",
    "created_at": "2026-06-18T12:00:00Z"
  },
  "search_parameters": {
    "engine": "google_scholar_author",
    "author_id": "example"
  },
  "articles": [
    {
      "position": 1,
      "title": "Example result",
      "link": "https://example.com/1",
      "snippet": "Structured JSON result."
    }
  ]
}
```

## Payment

1. Call without `X-PAYMENT`. The first 3 calls per identity (across all endpoints) return 200 with an `X-Free-Calls-Remaining` header.
2. After that the response is `402` with an `accepts[]` requirement.
3. Sign the EIP-3009 USDC authorization, base64 the x402 payload, resend as `X-PAYMENT`.
4. Settlement receipt returns in the `X-PAYMENT-RESPONSE` header.