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Crypto Math: Modular Exponentiation (mod-pow)
x402
Crypto Math: Modular Exponentiation (mod-pow) is a paid API for AI agents from crypto-math.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Computes base^exp mod m for big integers (up to 4096 bits), accepting decimal or 0x hex inputs, returning both decimal and hex results.
Price / call$0.02
Success—
StatusUnknown
How this service works
Modular exponentiation base^exp mod m for big integers, decimal or 0x hex, up to 4096 bits.
Output
Returns the computed value of base^exp mod m as both a decimal string and a hex string, along with the bit lengths of the modulus and exponent, and metadata like source and summary.
Example use cases
RSA encryption step verification
“I need to verify the RSA encryption step: compute 42^65537 mod 3233 — give me the result in decimal and hex please.”
Diffie-Hellman key exchange check
“Can you calculate the Diffie-Hellman public key: 2^48271 mod 0xFFFFFFFFFFFFFFC5 using big integer modular exponentiation?”
CTF cryptography challenge solver
“I'm working on a crypto challenge — I need to compute 0xDEADBEEF raised to the power 0x10001 modulo 0xFFFFFFFFFFFFFFFB and see both the hex and decimal output.”
Technical details
Endpoint
GEThttps://crypto-math.x402tookit.com/mod-pow?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to perform modular exponentiation on large integers (up to 4096 bits) typical in cryptographic operations like RSA, Diffie-Hellman, or ElGamal. It is ideal when inputs may be in either decimal or hex format and you need results in both representations. Prefer this over general-purpose math APIs when working specifically with big-integer cryptographic arithmetic.
Side effects
- Missing required query parameters (base, exp, or mod) returns an error
- Modulus of zero or negative value causes an invalid input error
- Exponent that is negative returns an error
- Input exceeding 4096-bit limit may be rejected
- Malformed hex strings (bad 0x prefix or non-hex characters) cause parse errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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