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Claude AI Text Classifier (x402)
x402
Claude AI Text Classifier (x402) is a paid API for AI agents from web-production-2d1051.up.railway.app, paid per call via x402, $0.005001/call, status unknown (last checked 2026-09-15).
Classifies text or JSON input into sentiment, topic, intent, urgency, or custom categories using Claude AI, with confidence scores and optional reasoning.
Price / call$0.005001
Success—
StatusUnknown
How this service works
Classify text or JSON into categories with AI: sentiment analysis, topic, intent detection, urgency triage, or a custom taxonomy. Returns labels with confidence scores and reasoning.
Output
Returns a JSON object with the top classification label, confidence score (0–1), an optional ranked list of all labels with their individual confidence scores, a reasoning string explaining the classification, and metadata including the Claude model used, preset, and input type.
Example use cases
Example prompt
“Classify this customer review by sentiment and include your reasoning — 'The delivery was fast but the product broke after one day.' Tell me the label, confidence score, and why you picked it.”
Technical details
Endpoint
POSThttps://web-production-2d1051.up.railway.app/v1/classifyWhen to prefer
Choose this endpoint when you need AI-powered text classification with confidence scoring and optional reasoning across preset categories (sentiment, topic, intent, urgency) or fully custom taxonomies. Ideal for agents that need structured, machine-readable classification output with calibrated confidence rather than raw LLM text. Prefer over generic LLM calls when you need consistent label schemas, multi-label ranking, and JSON responses. The micropayment model ($0.005/call) makes it cost-effective for moderate-volume classification tasks.
Side effects
- Missing or invalid x402 USDC payment header returns 402 Payment Required
- Invalid or unsupported preset value returns 400 Bad Request
- preset=custom without taxonomy array returns 400 Bad Request
- taxonomy array with fewer than 2 or more than 20 labels returns 400 Bad Request
- Input exceeding size limits returns 413 Payload Too Large
- Malformed JSON body returns 400 Bad Request
- Claude model unavailability may return 503 Service Unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | Text or JSON string to classify |
| preset | string | Classification preset. Default: sentiment |
| explain | boolean | Include reasoning string. Default: true |
| taxonomy | array | Custom label list (required when preset=custom, 2–20 labels) |
| input_type | string | text (default) or json |
| multi_label | boolean | Return ranked list of all labels. Default: false |
Output
Schema · Response
{
"type": "json",
"example": {
"meta": {
"model": "claude-haiku-4-5",
"preset": "sentiment",
"input_type": "text",
"multi_label": false
},
"label": "positive",
"labels": [
{
"label": "positive",
"confidence": 0.92
},
{
"label": "neutral",
"confidence": 0.06
},
{
"label": "negative",
"confidence": 0.02
}
],
"reasoning": "The text expresses strong satisfaction and approval with no negative indicators.",
"confidence": 0.92
}
}Tags
x402
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