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PennyRail Character Count
x402
PennyRail Character Count is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Counts the number of characters in a given input string
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object containing the operation name (e.g. 'char-count') and the result, which is the total character count of the provided input string.
Example use cases
Validate tweet length before posting
“Count the characters in this draft tweet so I know if it fits within the limit: 'Just launched our new product — check it out at example.com! #launch #startup'”
Check form field character limits
“How many characters are in this user bio I'm about to save: 'Passionate software engineer based in San Francisco, building tools that make developers' lives easier'?”
Measure code comment length
“Can you count the characters in this comment string: 'This function initializes the database connection pool and sets retry parameters'?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/f/text.char-countWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-use character counting operation via the x402 micropayment protocol, especially in automated agent workflows where billing granularity and machine-readable settlement matter. Prefer over rolling your own if you want auditable, on-chain payment records per computation.
Side effects
- Missing required 'input' field returns a validation error
- Non-string input type may cause unexpected results
- Very large strings may result in timeout or processing errors
- Payment failure (402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string | string |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| resultrequired | — | |
| operationrequired | string |
Tags
x402
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