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x402-tools Token Counter
x402
x402-tools Token Counter is a paid API for AI agents from x402.nichospt.net, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Counts the number of BPE tokens in a text string using GPT-4o or GPT-4 encodings, optionally estimating cost at a given price per million tokens.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call utility APIs for AI agents, settled in USDC via the x402 protocol.
Output
A JSON object with the encoding used, total token count, character count of the input, and optionally an estimated cost in USD if price_per_1m was provided.
Example use cases
Example prompt
“How many tokens is this text using the o200k_base encoding, and what would it cost at $5 per million tokens: 'The quick brown fox jumps over the lazy dog'?”
Technical details
Endpoint
POSThttps://x402.nichospt.net/count-tokens?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, pay-per-call token count for GPT-4o (o200k_base) or GPT-4/3.5/embeddings (cl100k_base) text without running a local tokenizer. Ideal for agents that need to check prompt size, estimate API costs, or validate context window fit before making an LLM call.
Side effects
- Text exceeds 1,000,000 character limit — request rejected
- Invalid encoding value (not cl100k_base or o200k_base) — validation error
- Missing text field — required parameter error
- Payment not settled via x402 protocol — 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text to tokenize |
| encoding | string | BPE encoding. o200k_base = GPT-4o/o1; cl100k_base = GPT-4/3.5/embeddings. |
| price_per_1m | number | Optional USD price per 1M tokens; if set, estimated_cost is returned. |
Output
Schema · Response
{
"type": "json",
"example": {
"encoding": "o200k_base",
"token_count": 5,
"estimated_cost": 0.0000125,
"character_count": 20
}
}Tags
x402
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