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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 text string and returns the character count
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object containing the character count of the provided input string, indicating how many characters the text contains.
Example use cases
Validate tweet length before posting
“Count the characters in this draft tweet for me: 'Just launched our new product — check it out at example.com! #launch #startup' — I need to make sure it's under 280 characters.”
Check bio length for social profile
“How many characters is this Instagram bio? 'Photographer & traveler. Capturing moments one frame at a time. Based in NYC. DMs open for collabs.'”
Measure form field input length
“Can you count the characters in this user-submitted description: 'I enjoy hiking, cooking, and exploring new cities. I am looking for a team that values creativity and collaboration.'?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/text.char-count--character-countWhen to prefer
Use this endpoint when you need a quick, pay-per-use character count computation without standing up your own infrastructure, or when operating within a micropayment-based agent workflow using the x402 protocol where $0.001 USDC per call fits the budget.
Side effects
- Missing 'input' field returns a validation error
- Empty string input may return zero or an error depending on server handling
- Very large strings may hit payload size limits
- Network or server errors return HTTP 5xx with no count data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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