# Feedback Theme Cross-Validation — Grouped Three-Fold Baseline Evaluation

> Feedback Theme Cross-Validation — Grouped Three-Fold Baseline Evaluation is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Runs a grouped three-fold cross-validation with a naive-Bayes baseline classifier on up to 200 labelled feedback text records across four themes: quality, price, delivery, and support.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-sector-ml-feedback-theme-cross-validation?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/feedback-theme-cross-validation-grouped-three-fold-baseline-evaluation-eb8da321
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4JBC5B2RN3hsZf4CmddGt

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability feedback-theme-cross-validation-grouped-three-fold-baseline-evaluation-eb8da321 -d '<json body>'
```

Example prompt: Run a grouped three-fold baseline cross-validation on my 60 labelled customer feedback records — each record has an ID, the feedback text, and an actual label that's one of quality, price, delivery, or support — and tell me how accurately a naive-Bayes classifier can distinguish those four themes.

## When to prefer this

Choose this endpoint when you have a small labelled feedback dataset (up to 200 records) and want a quick, cheap ($0.01 USDC) baseline evaluation using a naive-Bayes classifier with grouped three-fold cross-validation, without needing a hosted model or foundation-model infrastructure. It is specifically designed for the four feedback themes — quality, price, delivery, support — and is ideal for validating label quality, estimating baseline separability, or benchmarking before committing to more expensive ML pipelines.

## Known failure modes

- Fewer than 2 records supplied — minItems constraint violated
- More than 200 records supplied — maxItems constraint exceeded
- Invalid or missing 'actual' label — must be one of: quality, price, delivery, support
- Record ID exceeds 80 characters or is empty — minLength/maxLength constraint violated
- Text field exceeds 1000 characters per record
- Insufficient class representation across folds for meaningful cross-validation
- Payment not completed via x402 protocol — request rejected before processing

## How this service works

Feedback theme - Grouped three-fold baseline evaluation: Grouped three-fold baseline evaluation for Feedback theme. Up to 200 supplied labelled text records. Local dataset tools, evaluation and small naive-Bayes baselines; no hosted model or foundation-model training. One of 25 profiles or calculations across 20 shared operations in this sector. 0.01 USDC includes one bounded grouped three-fold baseline evaluation deliverable.

## Output

A bounded grouped three-fold baseline evaluation deliverable containing cross-validation accuracy metrics computed by a naive-Bayes classifier over the supplied labelled text records. Results indicate how well the four feedback themes (quality, price, delivery, support) can be separated by a simple baseline model, with per-fold or aggregate performance scores.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "records": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "id",
     "text",
     "actual"
    ],
    "properties": {
     "id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "text": {
      "type": "string",
      "default": "",
      "maxLength": 1000
     },
     "actual": {
      "enum": [
       "quality",
       "price",
       "delivery",
       "support"
      ],
      "type": "string"
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "id": "example-0-0",
     "text": "quality sample document number 0 for this supplied dataset.",
     "actual": "quality"
    },
    {
     "id": "example-0-1",
     "text": "quality sample document number 1 for this supplied dataset.",
     "actual": "quality"
    },
    {
     "id": "example-0-2",
     "text": "quality sample document number 2 for this supplied dataset.",
     "actual": "quality"
    },
    {
     "id": "example-1-0",
     "text": "price sample document number 0 for this supplied dataset.",
     "actual": "price"
    },
    {
     "id": "example-1-1",
     "text": "price sample document number 1 for this supplied dataset.",
     "actual": "price"
    },
    {
     "id": "example-1-2",
     "text": "price sample document number 2 for this supplied dataset.",
     "actual": "price"
    },
    {
     "id": "example-2-0",
     "text": "delivery sample document number 0 for this supplied dataset.",
     "actual": "delivery"
    },
    {
     "id": "example-2-1",
     "text": "delivery sample document number 1 for this supplied dataset.",
     "actual": "delivery"
    },
    {
     "id": "example-2-2",
     "text": "delivery sample document number 2 for this supplied dataset.",
     "actual": "delivery"
    },
    {
     "id": "example-3-0",
     "text": "support sample document number 0 for this supplied dataset.",
     "actual": "support"
    },
    {
     "id": "example-3-1",
     "text": "support sample document number 1 for this supplied dataset.",
     "actual": "support"
    },
    {
     "id": "example-3-2",
     "text": "support sample document number 2 for this supplied dataset.",
     "actual": "support"
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/feedback-theme-cross-validation-grouped-three-fold-baseline-evaluation-eb8da321/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)