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LLM Cost & Capacity Calc – Token Estimator
x402
LLM Cost & Capacity Calc – Token Estimator is a paid API for AI agents from llm-cost-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Estimates the number of LLM tokens in a text string (low/mid/high range) from character and word counts, without running a full tokenizer.
Price / call$0.02
Success—
StatusUnknown
How this service works
Rough LLM token estimate of text from characters and words, as a low-high range by content type. Not a tokenizer.
Output
Returns a JSON object with tokensLow, tokensMid, and tokensHigh (the estimated token range), plus supporting metadata: character count, byte count, word count, the characters-per-token ratios assumed, the content kind used, a human-readable summary and disclaimer, and optional reasons or degraded/notChecked flags if the estimate quality is limited.
Example use cases
Pre-flight prompt token check
“Before I send this system prompt to GPT-4, give me a rough token estimate — here's the text: 'You are a helpful assistant. Your job is to answer questions about our product catalog clearly and concisely.' Treat it as English.”
Code snippet token sizing
“Estimate how many tokens this Python function will use: 'def fibonacci(n): return n if n <= 1 else fibonacci(n-1) + fibonacci(n-2)' — use the code content type so the character-per-token assumption is right.”
CJK document token estimation
“I have this Japanese text I want to send to an LLM and need a token range estimate: '本日は晴天なり。人工知能の発展は目覚ましい。' — use the CJK mode for the calculation.”
Technical details
Endpoint
GEThttps://llm-cost-calc.x402tookit.com/token-estimate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap token estimate without calling a full tokenizer library or LLM API. Ideal for pre-flight checks, cost planning, or agents running in environments without tokenizer dependencies. Prefer it over sibling endpoints when you need raw token count rather than cost in dollars, context-window fit, or rate-limit throughput.
Side effects
- Text exceeds 20,000 character limit — request rejected
- Invalid 'kind' value other than english/code/cjk — may default or error
- Empty text input — may return zero or error
- Very mixed-language content may produce imprecise range
- Network or payment failure returning 402/503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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