# HARS-Zero Signal API – Sentiment Snapshot

> HARS-Zero Signal API – Sentiment Snapshot is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-18).

Returns a snapshot of current Polymarket prediction-market sentiment, listing active markets and their counts for AI agent consumption.

## Facts

- Endpoint: GET https://hars.cryptotavern.xyz/paid/sentiment-snapshot?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hars-zero-signal-api-sentiment-snapshot-2337470e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zFDMTriaccsQbmoq3hfSi

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 hars-zero-signal-api-sentiment-snapshot-2337470e
```

Example prompt: Pull me a Polymarket sentiment snapshot right now — I want to see which prediction markets are active and how many there are.

## When to prefer this

Choose this endpoint when you need a real-time crowd-sourced intelligence snapshot from Polymarket prediction markets, particularly when building AI agents that incorporate probabilistic event forecasting or sentiment signals into their reasoning. Prefer this over general news or sentiment APIs when you specifically want market-implied probabilities rather than textual sentiment analysis.

## Known failure modes

- Payment not received or insufficient USDC balance — returns HTTP 402 requiring x402 payment
- Invalid or malformed properties filter — may return empty markets array or error
- Polymarket data unavailable or upstream outage — returns empty count and markets array
- Network timeout on the x402 payment handshake — call fails before data is returned

## How this service works

Polymarket prediction-market intelligence for AI agents. Pay-per-call in USDC via x402 protocol. Multi-chain: Base + Solana.

## Output

Returns a JSON object containing a count of active Polymarket prediction markets and an array of market objects with associated metadata such as market titles, probabilities, and status. Can return an empty markets list if no results match the filter.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "example": {
  "count": 0,
  "markets": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hars-zero-signal-api-sentiment-snapshot-2337470e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from hars.cryptotavern.xyz](https://www.zero.xyz/host/hars.cryptotavern.xyz/llms.txt)