# Optix402 Compare Endpoint — x402 Marketplace Intelligence API

> Optix402 Compare Endpoint — x402 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 and compares x402 ecosystem services, enabling competitive analysis and market intelligence across registered x402 API offerings.

## Facts

- Endpoint: GET https://optinx402.vercel.app/api/compare
- 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-compare-endpoint-x402-marketplace-intelligence-api-cb81b7f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f1Q5rYtx_82vy4mLpVF6L

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-compare-endpoint-x402-marketplace-intelligence-api-cb81b7f6
```

Example prompt: Pull up a comparison of x402 marketplace services right now — I want to see how different APIs in the ecosystem stack up against each other in terms of offerings and market presence.

## When to prefer this

Use this endpoint when you need to compare and benchmark services within the x402 payment ecosystem specifically, or when doing competitive analysis across x402-enabled APIs. Prefer this over general API directories when the focus is specifically on x402 protocol marketplace intelligence.

## Known failure modes

- Empty services array returned when no comparison data is available
- Payment required (402) if USDC micropayment of $0.02 is not provided
- Invalid query parameters result in malformed or empty response
- Service unavailable if the Vercel deployment is down or cold-starting

## 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 with a 'services' array containing x402 marketplace service comparison data, including competitive metrics and ecosystem intelligence about registered x402 API offerings.

## 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",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "services": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/optix402-compare-endpoint-x402-marketplace-intelligence-api-cb81b7f6/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)