# Delx Overround Calculator

> Delx Overround Calculator is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Computes the overround (sum of implied probabilities minus 1) from an array of market probabilities

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/overround
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-overround-calculator-d588a2e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JrKw9ow5g1i_Oj94YGUTl

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 delx-overround-calculator-d588a2e4 -d '<json body>'
```

Example prompt: What's the overround on this market? The implied probabilities are [0.55, 0.30, 0.25] — I want to know how much margin the bookmaker is taking.

## When to prefer this

Use this endpoint when you need a fast, cheap ($0.001 USDC) single-call computation of bookmaker or market overround from raw implied probabilities. Prefer it over implementing your own summation logic when operating in an agent pipeline that already uses x402 micropayments, or when you want a consistent schema-versioned result (delx/util-overround/v1) for downstream processing.

## Known failure modes

- Empty or missing probs array returns an error or zero result
- Non-numeric values in the probs array may cause a parsing failure
- Probabilities that individually exceed 1.0 may produce unexpected overround values
- Network or payment authorization failure returns HTTP 402 or 5xx

## How this service works

Overround/vig from a set of mutually exclusive implied probs. Call when measuring book margin before de-vigging. Returns overround and sum of probs as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

## Output

Returns a JSON object containing the count of input probabilities (n), the schema identifier (delx/util-overround/v1), the computed overround as a decimal (e.g. 0.10 means 10% margin), and the raw sum of all input probabilities (sum_probs).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "probs": {
   "type": "array",
   "description": "Input field: probs."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "n": 2,
  "schema": "delx/util-overround/v1",
  "overround": 0.1000000000000001,
  "sum_probs": 1.1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-overround-calculator-d588a2e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)