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ONE Engine Text Token Character Counter (t4)
x402
ONE Engine Text Token Character Counter (t4) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0015/call, status unknown (last checked 2026-10-02).
Counts or tokenizes characters in a text string up to 50,000 characters long, returning token/character metrics.
Price / call$0.0015
Success—
StatusUnknown
How this service works
Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.
Output
Returns a JSON object containing character and/or token count metrics for the submitted text, likely including total character count and token count breakdown.
Example use cases
Pre-flight LLM context check
“Before I send this 10,000-word document to an AI model, can you count the characters and tokens so I know if it fits within the context window?”
Content length validation for CMS
“I need to verify that this article draft doesn't exceed 5,000 characters — can you count the exact character length of the text I'm pasting?”
Billing estimation for text API usage
“How many characters and tokens are in this batch of customer support replies? I want to estimate how much it'll cost to process them through a pay-per-token API.”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v3/text-token/characters/t4?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, pay-per-call character or token count for a text string up to 50,000 characters, especially in autonomous agent workflows on Base where x402 micropayments are already in use. At $0.0015 per call it is cost-effective for high-frequency validation tasks.
Side effects
- Text exceeds 50,000 character limit — returns an error or truncation notice
- Empty text field — may return zero counts or a validation error
- Malformed JSON body — returns a 400 bad request
- Payment not included or insufficient USDC balance — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| textrequired | string | Text up to 50000 characters |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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