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util.beauty Crypto Key Derivation
x402
util.beauty Crypto Key Derivation is a paid API for AI agents from util.beauty, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Derives cryptographic keys from input material using standard key derivation functions, billed per request via USDC micropayment or API key.
Price / call$0.005
Success—
StatusUnknown
How this service works
Metered web utilities for developers and AI agents: browser screenshot and PDF, crypto, DNS and net tools. Pay per request with x402 (USDC on Base) or prepaid API keys.
Output
Returns a JSON object with ok (boolean), the utility name, a requestId for tracing, and chargedCredits indicating how many credits were consumed. The derived key material is returned in the utility-specific response fields.
Example use cases
Password-based key stretching for encryption
“I need to turn a user password into a strong 256-bit AES encryption key — can you run PBKDF2-SHA256 with 100,000 iterations and the salt 'user-account-salt' on the password 'correct-horse-battery' and give me the derived key bytes?”
Deriving subkeys for multi-purpose secrets
“I have a master secret and I need to derive two separate subkeys from it — one labeled 'signing-key' and one labeled 'encryption-key' — can you run HKDF on each so I keep them cryptographically separated?”
Serverless KDF in an agent workflow
“My agent pipeline doesn't have a crypto library available — can you call util.beauty's key derivation endpoint to compute an HKDF-SHA256 derived key from the seed 'workflow-master-seed' with info 'session-token' so I can use it to sign a JWT?”
Technical details
Endpoint
POSThttps://util.beauty/v1/crypto/key_derivationWhen to prefer
Choose this endpoint when your agent or serverless pipeline needs cryptographic key derivation without bundling a crypto library, or when you want metered pay-per-use billing (USDC via x402 or prepaid key) for occasional KDF operations. Prefer it over running local crypto when operating in sandboxed environments or when auditability via requestId is needed.
Side effects
- Invalid or missing input key material returns a 400 error with descriptive message
- Unsupported KDF algorithm returns an error indicating valid options
- Insufficient credits or payment failure returns a 402 Payment Required response
- Malformed JSON body returns a 400 parse error
- Network timeout results in no charge and a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"utility": "…",
"requestId": "req_…",
"chargedCredits": 1
}
}Tags
x402
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