# entropy.rip Cryptographic Entropy API

> entropy.rip Cryptographic Entropy API is a paid API for AI agents from entropy.rip, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns a specified number of high-quality cryptographically secure random bytes for use in nonce generation, key material, and secure randomness applications.

## Facts

- Endpoint: GET https://entropy.rip/api/entropy/whisper
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/entropy-rip-774c66d0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MrBBSAEDmQs1S1SeW_316

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 entropy-rip-774c66d0
```

Example prompt: Give me 32 bytes of cryptographic entropy from entropy.rip for nonce generation.

## When to prefer this

Prefer this endpoint when your application requires externally sourced, high-quality cryptographic entropy — especially when you distrust local PRNG seeding, need a verifiable remote entropy source, or are building applications where auditability of randomness matters. Ideal for nonce generation, key bootstrapping, or lottery-style applications requiring unpredictable randomness. Note this is a paid endpoint ($0.01 USDC per call via x402).

## Known failure modes

- Payment not provided or insufficient — 402 Payment Required, endpoint requires $0.01 USDC per call via x402 protocol
- Invalid or non-integer value for bytes parameter — likely 400 Bad Request
- bytes value out of supported range — server may reject with 400 or 422
- Network or server error — 500 Internal Server Error, retry after backoff

## How this service works

Generate cryptographic random bytes

## Output

Returns a payload containing the requested number of cryptographically secure random bytes (default 32), suitable for use as nonces, key material, or any application requiring high-quality entropy.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "bytes": 32
  }
 }
}
```

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http",
     "description": "type"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string",
     "description": "method"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "bytes": {
       "type": "integer",
       "default": 32,
       "description": "bytes"
      }
     },
     "description": "queryParams"
    }
   },
   "description": "input",
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "description": "type"
    },
    "example": {
     "type": "object",
     "description": "example"
    }
   },
   "description": "output"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "entropy": "a1b2c3d4..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/entropy-rip-774c66d0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from entropy.rip](https://www.zero.xyz/host/entropy.rip/llms.txt)