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Verifiable Random Number Generator (HMAC-SHA256)
x402
Verifiable Random Number Generator (HMAC-SHA256) is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Generates a cryptographically verifiable random integer within a specified min-max range using HMAC-SHA256 over a client-supplied seed, with server seed revealed for independent verification.
Price / call$0.002
Success—
StatusUnknown
How this service works
Draws a random integer within any min-max range using HMAC-SHA256 over a client-supplied seed, revealing the server seed so the draw can be independently recomputed and verified afterward. For raffles, matchmaking, tie-breaking between competing agents, and any process where 'trust me, it was random' isn't good enough.
Output
Returns a random integer within the specified min-max range, along with the server seed and HMAC-SHA256 proof used to produce it, enabling anyone to recompute and confirm the result was not manipulated.
Example use cases
Example prompt
“Pick a verifiable random winner number between 1 and 500 using my seed 'raffle-2024-finalists' so I can prove the draw was fair afterward.”
Technical details
Endpoint
POSThttps://x402.forgemesh.io/verifiable-random-generatorWhen to prefer
Choose this endpoint when you need a random integer that must be independently verifiable and tamper-evident — such as raffles, contests, matchmaking, tie-breaking between agents, or any scenario where auditability matters. Prefer it over standard PRNGs when 'trust me, it was random' is insufficient and participants need cryptographic proof.
Side effects
- Invalid min/max values (e.g. min >= max) returning a 400 error
- Missing or malformed client_seed causing rejection
- Payment failure via x402 protocol resulting in 402 response
- Server-side seed generation failure returning 500 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| max | string | default 100 |
| min | string | default 1 |
| client_seed | string | your seed for verifiability |
Output
Schema · Response
{
"type": "json",
"example": {
"proof": "HMAC-SHA256(server_seed, client_seed) first 4 bytes mod range — recompute to verify",
"value": 4,
"server_seed_revealed": "e3b1..."
}
}Tags
x402
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