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PennyRail Character Count / String Length
x402
PennyRail Character Count / String Length 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 string and returns its length
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object containing the character count (string length) 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 so I know if it's under the 280-character limit: 'Just launched our new product — check it out at example.com! We think you'll love it. #launch #startup'”
Check bio field character limit
“How many characters is this bio text? 'Passionate software engineer who loves building things that matter. Coffee enthusiast. Dog dad. Based in Austin, TX.' I need to make sure it fits a 150-character limit.”
Measure API response string length
“Tell me the exact character count of this string I got from an API response: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0'”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/text.char-count--string-lengthWhen to prefer
Choose this endpoint when you need a simple, reliable, micropayment-gated string length computation via the x402 protocol, particularly in agentic pipelines that already use PennyRail for machine-readable settlement. It is ideal for lightweight text validation tasks within automated workflows where per-call cost is negligible.
Side effects
- Missing or empty 'input' field in request body returns a validation error
- Non-string input type may cause a schema validation failure
- Payment of 0.001 USDC per call required; failure to pay results in a 402 Payment Required response
- Extremely long strings may be subject to size limits or timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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