# HARS-Zero Signal API – Polymarket Structured Feed

> HARS-Zero Signal API – Polymarket Structured Feed is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns a structured feed of Polymarket prediction-market data and signals for AI agents, paid per-call in USDC via the x402 protocol.

## Facts

- Endpoint: GET https://hars.cryptotavern.xyz/paid/structured-feed
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hars-zero-signal-api-polymarket-structured-feed-7e407edd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bx_Z8F7Smsd7NWPzTTZNw

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-polymarket-structured-feed-7e407edd
```

Example prompt: Pull a structured feed of active Polymarket prediction markets from HARS-Zero and show me the current markets along with their counts — I want to see what's live right now.

## When to prefer this

Choose this endpoint when you need structured, AI-ready Polymarket prediction market data on a pay-per-call basis without a subscription, especially within x402-compatible agent workflows running on Base or Solana. Prefer this over scraping Polymarket directly or using general market data APIs when you need prediction market probabilities and signals in a clean, structured format ready for agent consumption.

## Known failure modes

- Payment not processed via x402 – returns 402 Payment Required if USDC payment is missing or insufficient
- Empty markets array returned if no markets match the provided filter properties
- Invalid input schema results in a 400 Bad Request
- Service unavailability or upstream Polymarket data outage returns 5xx error
- Rate limiting or quota exhaustion returns 429 Too Many Requests

## 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 matching prediction markets and an array of market objects from Polymarket, each containing market metadata and signal data relevant to AI agent consumption.

## 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-polymarket-structured-feed-7e407edd/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)