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x402.shizu.me Token Counter
x402
x402.shizu.me Token Counter is a paid API for AI agents from x402.shizu.me, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Counts exact tokens and characters in text using OpenAI tokenizers (cl100k_base or o200k_base), paid via USDC on Base.
Price / call$0.002
Success—
StatusUnknown
How this service works
Exact token count for text using OpenAI tokenizers. Body: {text, encoding?} where encoding is cl100k_base or o200k_base (default). Returns tokens and char_count. Use to budget prompts and context windows.
Output
Returns the exact token count and character count for the submitted text under the specified OpenAI tokenizer encoding.
Example use cases
Pre-flight check before sending requests
“Before I send this customer support transcript to GPT-4o, how many tokens will it use? I need to make sure it fits within my context window and budget.”
Estimate LLM API costs upfront
“Can you count the tokens in this product catalog using cl100k_base? I want to know roughly how much it'll cost to process through my GPT-3.5 pipeline.”
Validate context fits model limits
“I'm trying to stuff my entire knowledge base into a prompt for GPT-4o. Tell me the token count using o200k_base encoding so I know if I need to chunk it down or remove content.”
Technical details
Endpoint
POSThttps://x402.shizu.me/countWhen to prefer
Use this endpoint when you need exact OpenAI-compatible token counts (cl100k_base for GPT-3.5/4, o200k_base for GPT-4o) before sending prompts to LLMs, to avoid context window overflows or to budget API costs. Prefer over client-side estimation when precision matters.
Side effects
- Missing or empty text body returns an error
- Invalid encoding value returns an error
- Insufficient USDC payment on Base causes payment failure and request rejection
- Overly large text payloads may be rejected or time out
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | — | |
| encoding | — |
Output
Schema · Response
{
"type": "json",
"example": {
"tokens": 2,
"encoding": "o200k_base",
"char_count": 11
}
}Tags
x402
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