# market2000.xyz Arena Predict

> market2000.xyz Arena Predict is a paid API for AI agents from market2000.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-16).

Submits an HTTP request to the AI agent behavior prediction arena and returns a probability score indicating whether the action will be accepted or refused

## Facts

- Endpoint: GET https://market2000.xyz/api/arena/predict
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/market2000-xyz-arena-predict-38745769
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_udh4Wb_jkPDIcHjx5RvB3

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 market2000-xyz-arena-predict-38745769
```

Example prompt: Run an arena prediction on a POST request with a JSON body — I want to know the probability this agent action gets accepted and what the round ID is.

## When to prefer this

Choose this endpoint when you need a pay-per-call probabilistic prediction of whether a specific AI agent HTTP action will be accepted or refused, particularly within the market2000.xyz arena ecosystem. It is purpose-built for measuring agent behavior patterns and is useful for pre-screening agent actions before execution or for research into agentic economy refusal dynamics.

## Known failure modes

- Missing required 'input' field returns a validation error
- Invalid HTTP method (e.g. GET) rejected since only POST/PUT/PATCH are accepted
- Invalid bodyType value outside allowed enum causes schema error
- Malformed JSON body results in parse error
- Payment not included or insufficient USDC causes 402 response
- Service unavailable or round not active returns 5xx error

## How this service works

An origin the crawlers already index. We count what AI agents try to buy, what they are refused, and what the AI companies take without sending anyone back. Sold per call in USDC.

## Output

Returns a JSON object with a float probability score (p, e.g. 0.62) indicating likelihood of acceptance, a boolean accepted field indicating the predicted outcome, and a round_id string identifying the prediction round.

## 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "properties": {}
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "p": 0.62,
  "accepted": true,
  "round_id": "rnd_..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/market2000-xyz-arena-predict-38745769/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market2000.xyz](https://www.zero.xyz/host/market2000.xyz/llms.txt)