# Proc Chance Calculator

> Proc Chance Calculator is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Calculates the cumulative probability that a proc effect triggers at least once over a given number of hits, given a per-hit proc chance.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/proc-chance-calculator?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/proc-chance-calculator-2566851a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wFc4ZTsfCEfgqv3BOn54B

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 proc-chance-calculator-2566851a -d '<json body>'
```

Example prompt: What's the cumulative probability of a proc triggering at least once if I have an 8% chance per hit and I'm landing 12 hits?

## When to prefer this

Use this endpoint when you need to quickly compute cumulative proc probabilities for game design, balancing, or player decision-making contexts. Ideal for agents helping with RPG character builds, game mechanic analysis, or any scenario where repeated-trial binomial probability needs to be explained in plain terms. Best when inputs are a simple hit count and a per-hit percentage.

## Known failure modes

- Invalid or missing hits value — defaults to 12 if omitted
- Invalid or missing chance_per_hit value — defaults to 0.08 if omitted
- chance_per_hit outside valid range (0 to 1) may produce nonsensical results
- hits value of 0 returns 0% probability
- Negative values may cause computation errors

## How this service works

Proc chance calculator: Calculate cumulative probability for an effect over repeated hits.

## Output

Returns the cumulative probability (as a decimal or percentage) that a proc effect triggers at least once across the specified number of hits, given the per-hit chance. This is typically calculated as 1 - (1 - chance_per_hit)^hits.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hits": {
   "type": "number",
   "default": 12
  },
  "chance_per_hit": {
   "type": "number",
   "default": 0.08
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/proc-chance-calculator-2566851a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)