# Quotevault — Live Chainlink Price Feed

> Quotevault — Live Chainlink Price Feed is a paid API for AI agents from oraclepost.higgsfield.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-19).

Returns a live Chainlink oracle price (price, round ID, last update timestamp, feed address) for a specified crypto or forex pair on Base, read directly from the on-chain contract at request time.

## Facts

- Endpoint: GET https://oraclepost.higgsfield.app/api/premium/price
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quotevault-live-chainlink-price-feed-ec2a7c1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_q5bvnr34mNpsafvDrVdXI

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 quotevault-live-chainlink-price-feed-ec2a7c1b
```

Example prompt: What's the current ETH-USD price straight from the Chainlink oracle on Base — include the round ID and when it was last updated?

## When to prefer this

Choose this endpoint when you need a trustless, uncached, on-chain Chainlink oracle price for a supported Base pair and cannot rely on a centralized API or cached data. Ideal for DeFi agents, smart contract interactions, or any use case requiring verifiable, tamper-resistant price data with provenance (round ID, feed address, update time). Prefer over centralized exchange price APIs when on-chain verifiability matters.

## Known failure modes

- Unsupported pair — returns error if pair not in supported list (ETH-USD, BTC-USD, SOL-USD, LINK-USD, CBETH-USD, AERO-USD, USDC-USD, EUR-USD)
- RPC node unavailability — on-chain read may fail if the Base RPC endpoint is temporarily unreachable
- Payment failure — x402 payment of $0.02 USDC must succeed before data is returned
- Malformed pair parameter — passing incorrectly formatted pair string returns an error

## How this service works

Live Chainlink price feed on Base, read from the oracle contract at request time: price, round id, last update and feed address. Pairs: ETH-USD, BTC-USD, SOL-USD, LINK-USD, CBETH-USD, AERO-USD, USDC-USD, EUR-USD. Pass ?pair=ETH-USD (default ETH-USD). No third-party API, no cache.

## Output

Returns the live price (in USD or base quote currency), Chainlink round ID, last update timestamp, and the oracle contract feed address for the requested pair. Data is read directly from the on-chain Chainlink contract with no caching or third-party intermediary.

## 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": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "pair"
     ],
     "properties": {
      "pair": {
       "type": "string",
       "description": "Pair to quote, e.g. ETH-USD"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {}
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quotevault-live-chainlink-price-feed-ec2a7c1b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from oraclepost.higgsfield.app](https://www.zero.xyz/host/oraclepost.higgsfield.app/llms.txt)