# AI Model Comparison Endpoint (x402helper.xyz)

> AI Model Comparison Endpoint (x402helper.xyz) is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.013/call, status unknown (last checked 2026-10-31).

Returns a side-by-side comparison of two to five AI language models, accessible via USDC micropayment.

## Facts

- Endpoint: GET https://x402helper.xyz/89e509/model/compare?utm_source=zero.xyz
- Price: $0.013/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ai-model-comparison-endpoint-x402helper-xyz-df7b9d65
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Z0I0JSM23ip5L90L_KxdS

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 ai-model-comparison-endpoint-x402helper-xyz-df7b9d65
```

Example prompt: Can you compare GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro side by side so I can decide which one to use for my project?

## When to prefer this

Choose this endpoint when an agent needs a quick, structured comparison of two to five named AI models without having to aggregate data from multiple sources manually. It is particularly useful for agents making model-selection decisions on behalf of users, or when a consistent machine-readable comparison format is required. The x402 micropayment model makes it suitable for pay-per-use agent workflows without subscription overhead.

## Known failure modes

- Missing or invalid 'models' query parameter (fewer than two or more than five models)
- Unrecognized model name or alias returns an error or empty comparison
- Payment failure or insufficient USDC balance causes 402 rejection
- Malformed comma-separated model list causes parsing errors
- Network timeout or server unavailability returns no response

## How this service works

X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.

## Output

Returns a JSON object with a 'result' field containing structured comparison data for the specified AI models, and a 'success' boolean indicating whether the request was fulfilled.

## 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": [
      "models"
     ],
     "properties": {
      "models": {
       "type": "string",
       "default": null,
       "description": "Comma separated list of two to five model names or aliases to compare."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {},
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ai-model-comparison-endpoint-x402helper-xyz-df7b9d65/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)