# Search Aggregator Fast Tier (Serper)

> Search Aggregator Fast Tier (Serper) is a paid API for AI agents from x402-production-d123.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-19).

Performs fast web searches via Serper, returning titles, links, and snippets for up to 20 results at $0.01 USDC per query.

## Facts

- Endpoint: GET https://x402-production-d123.up.railway.app/search/fast
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/search-aggregator-fast-tier-serper-9c93d666
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_S5iDJUSiQwoMwCh6FiKKZ

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 search-aggregator-fast-tier-serper-9c93d666
```

Example prompt: Search the web for 'latest AI regulation news in the EU' and give me the top 10 results with titles and snippets.

## When to prefer this

Choose this fast-tier endpoint when you need quick web search results (titles, links, snippets) at low cost ($0.01 USDC) and low latency. Prefer it over the deep tier when full page content and multi-provider synthesis are not required, or when budget and speed matter more than depth of results.

## Known failure modes

- Invalid or missing query parameter returns an error
- max_results outside 1-20 range may be rejected or clamped
- Payment failure (x402) if USDC balance is insufficient
- Serper upstream outage causes no results or timeout
- Rate limiting if too many requests are made in quick succession

## How this service works

Search Aggregator fast tier: Serper web search (titles, links, snippets), fixed price $0.01 USDC. POST JSON body {query (required), max_results (optional 1-20, default 5)}. Mode is fixed by the path — no mode field needed, the quoted price is always the settled price.

## Output

Returns a JSON object containing the original query, an array of up to 20 result objects (each with URL, title, snippet, content, source_provider, and published_date), an optional synthesized answer string, a list of providers_used (Serper), latency in milliseconds, and any warnings.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "query"
     ],
     "properties": {
      "query": {
       "type": "string",
       "description": "search query"
      },
      "max_results": {
       "type": "number",
       "description": "max results, 1-20 (defaults: fast 5, deep 10)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "query",
      "results",
      "answer",
      "providers_used",
      "latency_ms",
      "warnings"
     ],
     "properties": {
      "query": {
       "type": "string"
      },
      "answer": {
       "type": [
        "string",
        "null"
       ]
      },
      "results": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "url",
         "title",
         "snippet",
         "content",
         "source_provider",
         "published_date"
        ],
        "properties": {
         "url": {
          "type": "string"
         },
         "title": {
          "type": "string"
         },
         "content": {
          "type": [
           "string",
           "null"
          ]
         },
         "snippet": {
          "type": "string"
         },
         "published_date": {
          "type": [
           "string",
           "null"
          ]
         },
         "source_provider": {
          "type": "string"
         }
        }
       }
      },
      "warnings": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "latency_ms": {
       "type": "number"
      },
      "providers_used": {
       "type": "array",
       "items": {
        "type": "string"
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/search-aggregator-fast-tier-serper-9c93d666/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-production-d123.up.railway.app](https://www.zero.xyz/host/x402-production-d123.up.railway.app/llms.txt)