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x402node Token Counter
x402
x402node Token Counter is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Returns exact BPE token counts for GPT-4o/GPT-4/GPT-3.5 and estimates for Claude and Llama, for LLM context budgeting and cost estimation before making an API call.
Price / call$0.005
Success—
StatusUnknown
How this service works
Exact BPE token count for GPT-4o, GPT-4 and GPT-3.5 plus Claude and Llama estimates, for budgeting LLM context and cost before an API call. token count, tokenizer, count tokens, context length, llm cost estimate, tiktoken
Output
Returns exact BPE token counts for GPT-4o, GPT-4, and GPT-3.5 models, plus heuristic estimates for Claude and Llama models, allowing the caller to budget context window usage and estimate API costs before making an LLM call.
Example use cases
Example prompt
“How many tokens would this system prompt use for GPT-4o: 'You are a helpful assistant. Always respond concisely and cite your sources when making factual claims.' — and give me the Claude estimate too so I can plan my API budget.”
Technical details
Endpoint
POSThttps://api.x402node.dev/ai/token-countWhen to prefer
Use this endpoint when you need to pre-flight check whether a prompt or document will fit within an LLM's context window, or when you want to estimate API costs across multiple model families (OpenAI, Anthropic, Meta) before committing to a call. Prefer this over building your own tiktoken integration when working in environments without native library support.
Side effects
- Empty or missing text body returns a 400 validation error
- Unsupported model name may fall back to heuristic estimate or error
- Very long inputs may time out or exceed payload limits
- Malformed JSON request body returns a parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text to tokenize (required, max 200KB) |
| model | string | Model: gpt-4o (default), gpt-4, gpt-3.5 |
Tags
x402
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