Discover / crypto-math.x402tookit.com

Crypto Math

■ Challenge detected

Generate or validate Luhn and ISO 7064 mod 97-10 (IBAN style) check digits from the string you supply.

Listed price
$0.02
Challenge detected
1 of the last check
Median response
205 ms
Last checked
21 Oct, 00:26 UTC
In our index since
21 Oct 2026

Endpoint

curl -i https://crypto-math.x402tookit.com/check-digits
# 402 Payment Required: pay with an x402 client (USDC on Arbitrum),
# then send the same request again with the payment attached.
10 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://crypto-math.x402tookit.com

  • GET/check-digitsNo price listedGenerate or validate Luhn and ISO 7064 mod 97-10 (IBAN style) check digits from the string you supply.
  • GET/primeNo price listedPrimality test (deterministic Miller-Rabin below 2^64) plus the next and previous prime, with BigInt.
  • GET/entropyNo price listedShannon entropy in bits per symbol from a frequency table, plus min-entropy, collision entropy and efficiency.
  • GET/mod-powNo price listedModular exponentiation base^exp mod m for big integers, decimal or 0x hex, up to 4096 bits.
  • GET/rsa-arithNo price listedRSA public key arithmetic: modulus bits, exponent validity, NIST strength; or a labelled toy RSA with tiny primes.
  • GET/gcd-extendedNo price listedgcd, lcm and extended-Euclid Bezout coefficients of two integers, plus gcd/lcm of up to 20 more.
  • GET/mod-inverseNo price listedModular multiplicative inverse of a mod m, or the gcd that proves none exists.
  • GET/encodingNo price listedConvert public bytes between hex, base64 and base64url (RFC 4648) with strict decoding and expected-length check.
  • GET/crtNo price listedSolve x = a1 (mod m1), x = a2 (mod m2), ... with the Chinese remainder theorem, coprime or not.
  • GET/ec-paramsNo price listedsecp256k1, P-256 and P-384 public parameters (p, n, G) from SEC 2, with an on-curve check of a public point.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 10 of 10 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/crypto-math.x402tookit.com

Recent checks

21 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.21 Oct 2026
All 1 checks
When (UTC)ResultHTTPResponse
21 Oct, 00:26 UTCChallenge detected402205ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 21 Oct, 00:26 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for Crypto Math?

Its listed price is $0.02.

What payment terms does Crypto Math advertise?

The listing advertises x402, Arbitrum, Base, Polygon, Solana and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is Crypto Math listed?

In x402 Bazaar. Superstables first indexed it on 21 Oct 2026.

Something wrong on this page? Tell us.

Crypto Math: listed price $0.02, x402 on Arbitrum, Base, Polygon and Solana