# Optix402 Category-Based Marketplace Intelligence API

> Optix402 Category-Based Marketplace Intelligence API is a paid API for AI agents from optinx402.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Retrieves real-time marketplace listings and analytics for a specified category within the x402 ecosystem

## Facts

- Endpoint: GET https://optinx402.vercel.app/api/category/%7Bcategory%7D
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/optix402-category-based-marketplace-intelligence-api-204dadbe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MVC07DPSyvXPbwTBxXm2X

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 optix402-category-based-marketplace-intelligence-api-204dadbe
```

Example prompt: Pull up the x402 marketplace listings for the 'ai' category — I want to see what APIs and services are available in that space right now.

## When to prefer this

Use this endpoint when you need to browse or analyze x402 ecosystem marketplace listings organized by category, particularly for competitive intelligence, market discovery, or ecosystem health monitoring within a specific domain like 'ai', 'finance', or 'data'. Prefer this over general web search when you want structured, real-time x402-native data.

## Known failure modes

- Invalid or unrecognized category string returns empty items array
- Category path parameter not URL-encoded may result in 404 or malformed response
- Service unavailable on Vercel cold start leads to timeout
- Payment not processed (x402 flow failure) results in 402 response before data is returned
- Empty category results in items:[] with no error indication

## How this service works

Real-time analytics for the x402 ecosystem. 30 endpoints covering market intelligence, buyer analytics, competitive analysis, revenue tracking, and ecosystem health.

## Output

Returns a JSON object containing a list of marketplace items and their details filtered to the requested category (e.g. {items: [...], category: 'ai'}), representing real-time x402 ecosystem data for that category.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "items": [],
  "category": "ai"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/optix402-category-based-marketplace-intelligence-api-204dadbe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from optinx402.vercel.app](https://www.zero.xyz/host/optinx402.vercel.app/llms.txt)