# HARS-Zero Signal API – Depth Snapshot

> HARS-Zero Signal API – Depth Snapshot is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.016/call, status unknown (last checked 2026-10-18).

Returns a depth snapshot of Polymarket prediction markets, providing order book and market intelligence data for AI agents.

## Facts

- Endpoint: GET https://hars.cryptotavern.xyz/paid/depth-snapshot?utm_source=zero.xyz
- Price: $0.016/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-depth-snapshot-1be4b2bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_goCSKGL2jMJhi0ZL6ye-L

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-depth-snapshot-1be4b2bf
```

Example prompt: Pull me a depth snapshot of current Polymarket prediction markets so I can see order book liquidity across active events.

## When to prefer this

Choose this endpoint when you need a point-in-time snapshot of Polymarket order book depth and market listings, especially in an autonomous agent context using USDC micropayments via the x402 protocol. Prefer this over scraping Polymarket directly when you need structured, agent-ready data with predictable pay-per-call pricing on Base or Solana.

## Known failure modes

- Payment not received or x402 protocol handshake fails — returns 402 Payment Required
- No markets match the provided properties filter — returns count:0 and empty markets array
- Invalid or malformed input properties parameter — may return an error or empty result
- Polymarket data source unavailable — may return stale or empty snapshot
- Rate limiting or quota exceeded after micropayment issues

## 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 matched markets and an array of market objects with order book depth data for Polymarket prediction markets. The markets array may be empty if no markets 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-depth-snapshot-1be4b2bf/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)