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CSPRNG Random Number & Bytes API
x402
CSPRNG Random Number & Bytes API is a paid API for AI agents from x402.donnyautomation.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Generates cryptographically secure random integers in a specified range or random bytes (hex/base64) server-side for deterministic or sandboxed AI agents
Price / call$0.01
Success—
StatusUnknown
How this service works
Cryptographically secure randomness for agents that are deterministic or sandboxed. Two modes: raw bytes (?bytes=1..1024, default 32, clamped) returning hex and base64url; or uniform integers (?min= and ?max= together, optional ?count=1..1000) rejection-sampled so there is no modulo bias. Errors: 400 bad_bytes for a non-integer, bad_range when max is not greater than min, range_too_large. Generated server-side, and the response says so - if nobody may have seen it, generate it yourself.
Output
Returns random integers uniformly sampled in [min, max] (rejection-sampled, no modulo bias) with a count up to 1000, or random bytes (1–1024) encoded as both hex and base64url. The response includes metadata stating the randomness source and any applicable limits.
Example use cases
Secure nonce for session token
“Generate 32 random bytes from a server-side CSPRNG and give me both the hex and base64url encodings so I can use them as a session nonce.”
Lottery number picker
“Pick 6 unique random integers between 1 and 49 using a cryptographically secure source — I need them for a lottery draw with no bias.”
Simulation random sampling
“I need 500 random integers between 0 and 999 for a Monte Carlo simulation — make sure they're from a proper CSPRNG with no modulo bias.”
Technical details
Endpoint
GEThttps://x402.donnyautomation.com/randomWhen to prefer
Use this endpoint when your AI agent runs in a deterministic or sandboxed environment that cannot generate its own entropy, and you need cryptographically secure randomness. Prefer it over pseudo-random alternatives when generating nonces, session tokens, cryptographic seeds, or running unbiased lotteries and simulations. The rejection-sampling guarantee makes it superior to modulo-based random integer generation.
Side effects
- min >= max returns an error (max must be strictly greater than min)
- bytes out of range 1-1024 returns a validation error
- count out of range 1-1000 returns a validation error
- mixing integer-mode and byte-mode parameters incorrectly may produce an error or default behavior
- payment failure (x402) if USDC balance is insufficient — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ts": "2026-08-01T00:00:00.000Z",
"hex": "9f86d081884c7d65…",
"bytes": 32,
"base64": "n4bQgYhMfWWa…",
"source": "node:crypto randomBytes (CSPRNG)"
}
}Tags
x402
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