# Nami Open Interest per Venue and Ticker

> Nami Open Interest per Venue and Ticker is a paid API for AI agents from api.usenami.io, paid per call via x402, $0.001000/call, status unknown (last checked 2026-09-13).

Returns open interest for a given perpetual ticker broken down by venue, including raw value and mark price with units noted per venue.

## Facts

- Endpoint: GET https://api.usenami.io/v1/perp/open-interest
- Price: $0.001000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-usenami-io-2fe68dad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8wrI6dW3A-DB6poqIxWNg

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 api-usenami-io-2fe68dad
```

Example prompt: What's the current open interest for BTC perp across all venues, including the mark price and units for each exchange?

## When to prefer this

Use this endpoint when you need a cross-venue snapshot of open interest for a specific perpetual ticker, especially when you need per-venue granularity and the associated mark price. Prefer this over funding rate or spread endpoints when the primary question is about aggregate market positioning or size at a given venue.

## Known failure modes

- Unknown ticker symbol returns empty or 404 response
- Venue not supported for the requested symbol returns missing data
- Malformed input type/method fields cause validation error
- Payment not fulfilled (x402) returns 402 Payment Required
- Rate limit exceeded returns 429 Too Many Requests

## How this service works

Open interest per venue for one crypto perpetual, with mark_price alongside — positioning and crowding across tracked CEX and DEX perp venues. Raw value: units vary per venue, see units_note in the response.

## Output

A breakdown of open interest per trading venue for the requested ticker, including the raw open interest value, mark price at time of query, and a units_note field clarifying the denomination used by each venue.

## Example request

```json
{
 "input": {
  "type": "perpetual",
  "method": "GET"
 },
 "venue": "binance",
 "ticker": "BTC"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "method": {
     "type": "string"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-usenami-io-2fe68dad/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.usenami.io](https://www.zero.xyz/host/api.usenami.io/llms.txt)