# Sentiment Top-k Label Coverage

> Sentiment Top-k Label Coverage is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Computes top-k label coverage metrics for sentiment classification results across up to 200 labelled text records

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-sector-ml-sentiment-top-k?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sentiment-top-k-label-coverage-d42681bc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4BVHQa2iQedJQAc-1hJRU

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 sentiment-top-k-label-coverage-d42681bc -d '<json body>'
```

Example prompt: Calculate the top-2 label coverage for my sentiment classifier — I have 50 labelled records each with actual labels (positive, neutral, or negative), predicted labels, and a 3-element probability vector. Can you run the top-k coverage evaluation and tell me the score?

## When to prefer this

Choose this endpoint when you need a lightweight, low-cost ($0.01 USDC) computation of top-k label coverage for a 3-class sentiment classification task (positive/neutral/negative) on up to 200 records. Ideal for quick evaluation of local classifiers or naive-Bayes baselines without needing a hosted model or foundation model. Best suited for small dataset evaluation runs where you already have predicted labels and probability scores.

## Known failure modes

- More than 200 records supplied — exceeds the per-call limit
- Probability arrays not summing to 1 or having fewer/more than 3 elements
- Invalid or missing label values outside the positive/neutral/negative enum
- k value outside the allowed range of 1–3
- Malformed record IDs exceeding 80 characters or missing required fields
- Payment failure via x402 protocol

## How this service works

Sentiment - Top-k label coverage: Top-k label coverage for Sentiment. 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 top-k label coverage deliverable.

## Output

Returns a bounded top-k label coverage deliverable: a numeric coverage score indicating the fraction of records where the true sentiment label (positive, neutral, or negative) falls within the top k predicted labels, based on the supplied probability vectors.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "k": {
   "type": "integer",
   "default": 2,
   "maximum": 3,
   "minimum": 1
  },
  "records": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "id",
     "text",
     "actual",
     "predicted",
     "probabilities"
    ],
    "properties": {
     "id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "text": {
      "type": "string",
      "default": "",
      "maxLength": 1000
     },
     "actual": {
      "enum": [
       "positive",
       "neutral",
       "negative"
      ],
      "type": "string"
     },
     "predicted": {
      "enum": [
       "positive",
       "neutral",
       "negative"
      ],
      "type": "string"
     },
     "probabilities": {
      "type": "array",
      "items": {
       "type": "number",
       "default": 0,
       "maximum": 1,
       "minimum": 0
      },
      "default": [],
      "maxItems": 3,
      "minItems": 3
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "id": "example-0-0",
     "text": "positive sample document number 0 for this supplied dataset.",
     "actual": "positive",
     "predicted": "positive",
     "probabilities": [
      0.8,
      0.1,
      0.1
     ]
    },
    {
     "id": "example-0-1",
     "text": "positive sample document number 1 for this supplied dataset.",
     "actual": "positive",
     "predicted": "positive",
     "probabilities": [
      0.8,
      0.1,
      0.1
     ]
    },
    {
     "id": "example-0-2",
     "text": "positive sample document number 2 for this supplied dataset.",
     "actual": "positive",
     "predicted": "positive",
     "probabilities": [
      0.8,
      0.1,
      0.1
     ]
    },
    {
     "id": "example-1-0",
     "text": "neutral sample document number 0 for this supplied dataset.",
     "actual": "neutral",
     "predicted": "neutral",
     "probabilities": [
      0.1,
      0.8,
      0.1
     ]
    },
    {
     "id": "example-1-1",
     "text": "neutral sample document number 1 for this supplied dataset.",
     "actual": "neutral",
     "predicted": "neutral",
     "probabilities": [
      0.1,
      0.8,
      0.1
     ]
    },
    {
     "id": "example-1-2",
     "text": "neutral sample document number 2 for this supplied dataset.",
     "actual": "neutral",
     "predicted": "neutral",
     "probabilities": [
      0.1,
      0.8,
      0.1
     ]
    },
    {
     "id": "exam
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sentiment-top-k-label-coverage-d42681bc/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)