# Delx Open Knowledge Search

> Delx Open Knowledge Search is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Search English Wikipedia metadata via the Wikimedia API, returning attributed page links and short snippets for a given query at $0.001 USDC per call.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/open-knowledge-search
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-open-knowledge-search-d65a9b96
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i--1laBCwgqX1eHhfGNns

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 delx-open-knowledge-search-d65a9b96 -d '<json body>'
```

Example prompt: Search Wikipedia for 'Marie Curie' and give me up to 5 article links with short snippets so I can find the right reference.

## When to prefer this

Choose this endpoint when you need quick, attributed, factual reference links and snippets from English Wikipedia — ideal for fact-checking, citation gathering, or background research where source attribution matters. Prefer this over general web search when you specifically want encyclopedia-quality, Wikimedia-sourced results. Not suitable for retrieving full article text, arbitrary web pages, or non-Wikipedia sources.

## Known failure modes

- Query string is empty or exceeds 120 characters — validation error returned
- Wikimedia API upstream timeout if timeout parameter is too low (minimum 2 seconds)
- No matching Wikipedia articles found — empty results array returned
- Payment failure or insufficient USDC balance — x402 payment required error
- Rate limiting or upstream Wikimedia API unavailability — service error returned

## How this service works

Search bounded English Wikipedia metadata for $0.001 USDC through the public Wikimedia API. Returns attributed page links and short snippets only—not general web search, arbitrary URLs, or article bodies.

## Output

Returns up to 10 Wikipedia search results, each containing an attributed page title, a URL link to the Wikipedia article, and a short descriptive snippet extracted from the page metadata. Results come from English Wikipedia only and do not include full article bodies.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "maxLength": 120,
   "minLength": 1
  },
  "timeout": {
   "type": "integer",
   "default": 8,
   "maximum": 8,
   "minimum": 2
  },
  "max_records": {
   "type": "integer",
   "default": 10,
   "maximum": 10,
   "minimum": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "cache": "miss",
   "count": 1,
   "query": "agentic commerce",
   "scope": "open_knowledge",
   "schema": "delx/open-knowledge-search/v1",
   "results": [
    {
     "url": "https://en.wikipedia.org/wiki/Example_topic",
     "title": "Example topic",
     "pageid": 123,
     "snippet": "A short attributed search snippet."
    }
   ],
   "language": "en",
   "provider": "Wikimedia/Wikipedia",
   "attribution": "Search metadata supplied by Wikimedia/Wikipedia; snippets remain under the applicable page licenses. Preserve attribution and the license link.",
   "license_url": "https://creativecommons.org/licenses/by-sa/4.0/",
   "max_records": 3,
   "provider_url": "https://www.wikipedia.org/"
  },
  "tool_name": "search_open_knowledge"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-open-knowledge-search-d65a9b96/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)