# Vealth Kelly Sizer — Half-Kelly Position Sizing

> Vealth Kelly Sizer — Half-Kelly Position Sizing is a paid API for AI agents from vealth.net, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Computes Half-Kelly optimal position size given edge, bankroll, and confidence across 12+ strategy normalizers

## Facts

- Endpoint: POST https://vealth.net/.well-known/vealth/cdp/kelly-sizer
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vealth-kelly-sizer-half-kelly-position-sizing-00692fd5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NbUPOuJd0GWpHW4dX_9Rt

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 vealth-kelly-sizer-half-kelly-position-sizing-00692fd5 -d '<json body>'
```

Example prompt: I have a $50,000 bankroll, my edge on this trade is 0.08, and I'm 75% confident in my estimate — use half-Kelly position sizing to tell me how much to allocate.

## When to prefer this

Choose this endpoint when you need a principled, Half-Kelly-normalized position size that accounts for both raw edge and confidence uncertainty, especially across diverse strategy types. Prefer it over a plain Kelly calculator when managing a multi-strategy portfolio or when you want built-in normalization across 12+ strategy archetypes.

## Known failure modes

- Missing required field (edge, bankroll, or confidence) returns a 400-level error
- Edge value outside valid range (e.g. negative or >1) may return validation error
- Payment not processed or insufficient USDC balance causes x402 payment failure
- Confidence value out of [0,1] range may cause normalization error

## How this service works

kelly-sizer (CDP-settled mirror) — Half-Kelly position sizing with 12+ strategy normalizers

## Output

Returns a Half-Kelly-adjusted position size recommendation, normalized across 12+ strategy types, indicating the optimal fraction or dollar amount to deploy given the supplied edge, bankroll, and confidence level.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "edge": {
   "type": "number"
  },
  "bankroll": {
   "type": "number"
  },
  "confidence": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vealth-kelly-sizer-half-kelly-position-sizing-00692fd5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vealth.net](https://www.zero.xyz/host/vealth.net/llms.txt)