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PennyRail Token Counter
x402
PennyRail Token Counter 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 tokens in a given text input using a nano-scale paid API endpoint
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a count of tokens present in the submitted text, likely as a numeric value or object containing the count and possibly token-level breakdown details.
Example use cases
Pre-flight LLM prompt sizing
“Before I send this 3-paragraph draft to GPT-4, can you count how many tokens it contains so I know if it fits in the context window?”
API cost estimation for bulk text
“I have this product description I'm about to embed — can you tell me the token count so I can estimate what it'll cost per call?”
Enforcing token limits in user input
“Check how many tokens are in the user's message: 'Please summarize the entire history of the Roman Empire in exhaustive detail' — I want to know if it exceeds 512 tokens.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/text.token-count--count-tokensWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-use token counting service without spinning up a local tokenizer library. It is ideal for agent pipelines that need to verify token budgets before LLM calls, estimate costs, or enforce input size limits, especially when running in serverless or constrained environments where installing tokenizer dependencies is impractical.
Side effects
- Missing 'input' field in request body returns validation error
- Empty or null text may return zero or an error
- Malformed JSON body causes parse failure
- Payment not included or insufficient USDC triggers 402 response
- Rate limiting or service unavailability returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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