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PennyRail BPE Token Counter
x402
PennyRail BPE 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 BPE (Byte Pair Encoding) tokens in a given text string using a tokenizer-compatible method
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a token count (integer) representing how many BPE tokens the input text encodes to, enabling callers to measure prompt length, enforce context window limits, or estimate LLM API costs.
Example use cases
Prompt length guard before LLM call
“Before I send this system prompt to the model, count its BPE tokens for me: 'You are a helpful assistant specialized in tax law. Always cite sources. Never speculate beyond your knowledge cutoff.' I want to make sure it fits under 512 tokens.”
Chunking documents for RAG pipeline
“I'm splitting this paragraph into chunks for my retrieval system — can you count how many BPE tokens are in this chunk? 'Quantum computing leverages superposition and entanglement to perform calculations exponentially faster than classical machines for specific problem types.'”
Cost estimation for batch text processing
“I need to estimate how many tokens this user review will consume before I process it through the API: 'Absolutely loved the product — arrived early, packaging was perfect, and the quality exceeded expectations. Will definitely order again.' Can you count the BPE tokens?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/text.token-count--bpe-token-countWhen to prefer
Use this endpoint when you need fast, programmatic BPE token counts for LLM prompt management, context-window enforcement, or cost estimation — especially inside autonomous agent pipelines that require metered, pay-per-call access via x402 USDC micropayments without managing API keys.
Side effects
- Missing or malformed 'input' object returns a validation error
- Empty or null text field may return zero or an error
- Payment failure (402) if USDC balance is insufficient
- Ambiguous tokenizer type (BPE variant not specified) may produce unexpected counts
- Very large inputs may time out or be rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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