# PunkPredictor Fair Price Plus

> PunkPredictor Fair Price Plus is a paid API for AI agents from api.punkpredictor.xyz, paid per call via x402, $10/call, status unknown (last checked 2026-10-13).

Returns a CryptoPunk's fair value in ETH along with uncertainty score and confidence intervals for a given punk ID

## Facts

- Endpoint: POST https://api.punkpredictor.xyz/agents/v2/fair-price-plus?utm_source=zero.xyz
- Price: $10/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/punkpredictor-fair-price-plus-345e3853
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oylnzcmQj43929QFF7FCo

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 punkpredictor-fair-price-plus-345e3853 -d '<json body>'
```

Example prompt: What's the fair value of CryptoPunk #5822, and can you give me the 80% confidence price interval and uncertainty score so I know how reliable that estimate is?

## When to prefer this

Choose this endpoint when you need not just a point estimate but also a full distributional picture of a CryptoPunk's value — including uncertainty score and confidence intervals — rather than a bare fair-value figure. It is ideal for risk-aware buying, selling decisions, or arbitrage screening where knowing the reliability of the estimate matters as much as the estimate itself.

## Known failure modes

- Invalid punk ID (outside 0–9999 range) returns a validation error
- Payment of $10 USDC not completed results in a 402 Payment Required response
- Network or upstream model timeout may return a 503
- Missing or malformed request body returns a 400 Bad Request

## How this service works

Punk fair value plus distribution, uncertainty, and intervals

## Output

A JSON object containing the punk's ID, its fair price in ETH (fair_price_eth), an uncertainty_score between 0 and 1 indicating model confidence, and an intervals object with lower and upper bound prices in ETH at one or more confidence levels (e.g. 80% interval).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "id_punk": {
   "type": "integer",
   "maximum": 9999,
   "minimum": 0
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id_punk": 5822,
  "intervals": {
   "80": {
    "lower": 24.4,
    "upper": 33.1
   }
  },
  "fair_price_eth": 28.74,
  "uncertainty_score": 0.22
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/punkpredictor-fair-price-plus-345e3853/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.punkpredictor.xyz](https://www.zero.xyz/host/api.punkpredictor.xyz/llms.txt)