# BlockRun Kalshi Open Interest Lookup

> BlockRun Kalshi Open Interest Lookup is a paid API for AI agents from blockrun.ai, paid per call via x402, $0.0085/call, status unknown (last checked 2026-09-15).

Fetches open interest data for a specific Kalshi prediction market contract by ticker symbol.

## Facts

- Endpoint: GET https://blockrun.ai/api/v1/surf/prediction-market/kalshi/open-interest
- Price: $0.0085/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockrun-kalshi-open-interest-lookup-b7979b11
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a23hpEz7sYFQB7yl4FUF6

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 blockrun-kalshi-open-interest-lookup-b7979b11
```

Example prompt: What's the current open interest on the Kalshi market with ticker HIGHTEMP-2025-JAN?

## When to prefer this

Use this endpoint when you need open interest specifically from Kalshi's prediction market platform via a pay-per-call USDC-settled API, without needing a direct Kalshi API key — ideal for AI agents that want financial-grade prediction market data billed atomically on-chain.

## Known failure modes

- Invalid or unknown ticker symbol returns an error or empty result
- Ticker for a closed or settled market may return zero or an error
- Network or upstream Kalshi API unavailability causes a 502/503 response
- Missing required ticker query parameter returns a 400 bad request

## How this service works

Pay for the outcome. One endpoint for every model, tool and data source an agent needs — each call priced before it runs, at the best value per dollar. 103 models and 100 data and tool APIs.

## Output

Returns open interest figures for the specified Kalshi prediction market ticker, reflecting the total number of outstanding (unsettled) contracts currently held by market participants, indicating liquidity and engagement levels.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "ticker": {
   "type": "string",
   "description": "Required query param"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockrun-kalshi-open-interest-lookup-b7979b11/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from blockrun.ai](https://www.zero.xyz/host/blockrun.ai/llms.txt)