# claw402 Low-Ranking OI Endpoint (nofx)

> claw402 Low-Ranking OI Endpoint (nofx) is a paid API for AI agents from claw402.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Returns a list of low-ranking open interest (OI) data, optionally filtered by limit and duration, via a crypto-payment-gated GET request.

## Facts

- Endpoint: GET https://claw402.ai/api/v1/nofx/oi/low-ranking
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/claw402-low-ranking-oi-endpoint-nofx-f73881b7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3zHCuzOhabawsAWeBtQC_

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 claw402-low-ranking-oi-endpoint-nofx-f73881b7
```

Example prompt: Can you pull the bottom 20 low-ranking open interest entries from claw402's nofx market data feed filtered to the last 24-hour duration?

## When to prefer this

Choose this endpoint when you need low-ranking open interest data from the vergex.trade-backed claw402 platform, pay-per-call with USDC (no API key setup required), and want to filter results by count limit or time duration. Prefer over traditional API-key services when you need frictionless micropayment access to crypto market OI data.

## Known failure modes

- Payment not received or insufficient USDC — 402 Payment Required response
- Invalid query parameters (non-string limit or duration) — 400 Bad Request
- Empty data array returned when no low-ranking OI data is available for the requested duration
- Service unavailable from underlying vergex.trade provider — 503 or timeout
- Network errors if the x402 payment gateway is unreachable

## How this service works

Backed by vergex.trade. Pay for any API with USDC. No API keys. No registration. Just a wallet.

## Output

Returns a JSON object with a status code (0 for success) and a data array containing low-ranking open interest records, filtered by the requested limit and duration parameters.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "limit": "10",
   "duration": "24h"
  }
 }
}
```

## 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",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "string"
      },
      "duration": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "code": 0,
  "data": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/claw402-low-ranking-oi-endpoint-nofx-f73881b7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from claw402.ai](https://www.zero.xyz/host/claw402.ai/llms.txt)