# Realedger Tokenized ETF Basis Monitor

> Realedger Tokenized ETF Basis Monitor is a paid API for AI agents from api.realedger.xyz, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-14).

Returns live basis data for tokenized ETFs (USO, SPY, QQQ, GLD, SLV) on Robinhood Chain, including on-chain USDG pool price, fund NAV, session status, futures move, expected off-hours price with band, and basis spread — refreshed every 15 minutes.

## Facts

- Endpoint: GET https://api.realedger.xyz/v1/basis
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/realedger-tokenized-etf-basis-monitor-0b0533e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yfPPZbJP8re4AeqLtgHl1

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 realedger-tokenized-etf-basis-monitor-0b0533e4
```

Example prompt: Pull the latest basis data for the tokenized ETFs on Robinhood Chain — I want to see the on-chain pool prices, current fund NAV prints, whether the session is open, futures moves since close, and the basis spreads for SPY, QQQ, USO, GLD, and SLV.

## When to prefer this

Use this endpoint when you need real-time basis monitoring for tokenized ETFs specifically on Robinhood Chain, want both the on-chain price and the real fund NAV in a single call, need futures-implied off-hours pricing with a band, or are running a basis trading or arbitrage strategy against tokenized equity/commodity ETFs. Prefer this over generic DeFi price feeds when the Robinhood Chain tokenized ETF ecosystem is your specific target.

## Known failure modes

- Stale data if upstream oracle or chain data is delayed beyond 15-minute window
- No response if Robinhood Chain (chain 4663) RPC is unavailable
- Partial results if one or more ETF pools have no recent Uniswap liquidity events
- Payment failure if USDC balance or x402 payment header is missing or insufficient
- Grade A data unavailable if on-chain data quality drops below threshold

## How this service works

Basis Ledger live read: tokenized ETFs on Robinhood Chain (USO, SPY, QQQ, GLD, SLV) against the funds they mirror. On chain USDG pool price at grade A, the fund's newest print and whether its session is open, the futures move since the fund closed, the expected off hours price with a band, and the basis. Read every fifteen minutes.

## Output

A structured snapshot per tokenized ETF (USO, SPY, QQQ, GLD, SLV) containing: on-chain USDG pool price at grade A quality, the fund's latest NAV print, whether the fund's trading session is currently open, futures price move since the fund last closed, the expected off-hours price with a confidence band, and the basis (on-chain price minus NAV). Data is refreshed every 15 minutes.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/realedger-tokenized-etf-basis-monitor-0b0533e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.realedger.xyz](https://www.zero.xyz/host/api.realedger.xyz/llms.txt)