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Security Math – Password Entropy Calculator
x402
Security Math – Password Entropy Calculator is a paid API for AI agents from security-math.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).
Computes entropy bits for a password, PIN, or diceware passphrase given its length and character set, plus estimated crack-time ranges across attacker profiles.
Price / call$0.02
Success—
StatusUnknown
How this service works
Entropy bits for a random password policy, PIN or diceware passphrase from length and alphabet, with crack-time ranges.
Output
Returns entropy bits total and per character/word, a strength rating and verdict, a summary explanation, a list of contributing reasons, and an array of crack-time entries for different attacker profiles (each with attacker name, assumption, guesses-per-second, average time, and worst-case time). Also includes a disclaimer, any factors not checked, and a timestamp.
Example use cases
Evaluating corporate password policy strength
“Our password policy requires 10 characters minimum with uppercase, lowercase, and at least one digit — calculate the entropy bits and show me how long it would take different attackers to crack it.”
Comparing diceware passphrase security
“How secure is a 6-word diceware passphrase drawn from the standard 7776-word list? Give me the entropy bits and crack-time estimates.”
Auditing a legacy 4-digit PIN policy
“We're reviewing our ATM PIN security — what's the entropy and expected crack time for a 4-digit numeric PIN (digits only, length 4)?”
Technical details
Endpoint
GEThttps://security-math.x402tookit.com/password-entropy?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a rigorous, multi-attacker-profile entropy and crack-time analysis for a specific password or passphrase policy — especially when you need to compare character sets (lowercase only vs. alphanumeric vs. full ASCII), evaluate diceware passphrases, or justify security decisions with quantified crack-time estimates. Prefer it over generic password strength checkers when you need numeric entropy bits and attacker-model breakdowns rather than a simple weak/strong label.
Side effects
- Missing required 'length' parameter returns an error
- Length outside 1–1000 range may return a validation error
- Conflicting flags (e.g., words=true with character flags) may produce unexpected pool sizes
- Network or payment failure returns 402 or connection error
- Very large pool sizes or extreme lengths may return degraded=true with a warning
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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