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A1Z26 and Polybius Square Number Ciphers
x402
A1Z26 and Polybius Square Number Ciphers is a paid API for AI agents from text-ciphers.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).
Encodes text to numbers or decodes numbers to text using A1Z26 (A=1, B=2…) or Polybius square cipher, with optional keyword square and ADFGX label support.
Price / call$0.02
Success—
StatusUnknown
How this service works
A1Z26 (A=1) and Polybius square number ciphers, both ways, with optional keyword square and ADFGX labels.
Output
Returns the encoded number string or decoded plaintext, the cipher mode and type used, the Polybius square grid (when applicable), the keyword used, a summary of the operation, and metadata fields like source and asOf timestamp.
Example use cases
Solve a number cipher puzzle
“I found this sequence of numbers in a puzzle — 8 5 12 12 15 — can you decode it using the A1Z26 cipher to find the hidden word?”
Encode message with Polybius square
“Encode 'MEET AT DAWN' using the Polybius square cipher with the keyword 'SECRET' and standard 12345 row/column labels.”
Decode ADFGX Polybius ciphertext
“I have a Polybius-encoded message that uses ADFGX labels instead of numbers — can you decode 'AF AD GF GF DX' back to plain text?”
Technical details
Endpoint
GEThttps://text-ciphers.x402tookit.com/number-ciphers?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to encode or decode text using classical number-substitution ciphers specifically — A1Z26 (letter-to-number mapping) or Polybius square (coordinate-based substitution). Ideal for puzzle solving, educational demonstrations, escape room design, or historical cryptography exploration. Prefer this over Caesar/ROT endpoints when the cipher output is numbers rather than shifted letters, and over Playfair when you need a simpler number-based scheme.
Side effects
- Text exceeds 1000 character limit — request will fail or be truncated
- Invalid cipher parameter value (not 'a1z26' or 'polybius') — returns error
- Decode mode given non-numeric or malformed input for A1Z26
- Polybius keyword contains non-alphabetic characters — may cause unexpected square layout
- Missing required 'text' query parameter — returns validation error
- Numbers out of range for A1Z26 (e.g. 0 or 27+) during decode — may produce empty or error output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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