# Mint Intel: Base Chain ETH/USD Price Feed

> Mint Intel: Base Chain ETH/USD Price Feed is a paid API for AI agents from mintintel.35-171-220-195.sslip.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Returns the current ETH/USD price on Base chain by batching Chainlink latestRoundData and Uniswap v3 WETH/USDC spot price, then reporting the median, per-source prices, feed age, round info, and spread in basis points.

## Facts

- Endpoint: GET https://mintintel.35-171-220-195.sslip.io/v1/base/eth-usd?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mint-intel-base-chain-eth-usd-price-feed-1e727733
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3P7EHwjvnCNk20keRc07k

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 mint-intel-base-chain-eth-usd-price-feed-1e727733
```

Example prompt: What's the current ETH/USD price straight from Base chain — pull the Chainlink and Uniswap on-chain sources and show me the median, each source's price, and the spread between them.

## When to prefer this

Choose this endpoint when you need a trustless, decentralized ETH/USD price from Base chain without relying on a centralized exchange or a third-party API key. It is ideal when you need both Chainlink oracle data and Uniswap v3 spot price in one call, or when feed freshness and source-level transparency matter. Prefer it over generic price APIs when operating within a DeFi workflow on Base that requires on-chain price provenance.

## Known failure modes

- RPC node unavailable — Base chain RPC call fails, returning a 5xx error
- Stale feed — Chainlink round data is older than expected, flagged in feed age field
- Price deviation — extreme spread between Chainlink and Uniswap may indicate pool manipulation or low liquidity
- Payment failure — x402 micropayment of $0.001 USDC not completed, returns 402
- Network timeout — batch RPC call exceeds timeout threshold

## How this service works

ETH/USD read straight from Base state, no CEX or API key: the Chainlink ETH/USD feed (latestRoundData) plus the Uniswap v3 WETH/USDC 0.05% pool spot price in one RPC batch. Median of fresh sources, per-source price, feed age and round, spread in bps.

## Output

A JSON object containing the trading pair label (ETH/USD), the median price computed across sources, and an array of per-source entries each with the source name, its reported price, feed age in seconds, and round ID; also includes the spread between sources in basis points.

## 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": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "pair",
      "price",
      "sources"
     ],
     "properties": {
      "pair": {
       "type": "string"
      },
      "price": {
       "type": "number"
      },
      "sources": {
       "type": "array"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mint-intel-base-chain-eth-usd-price-feed-1e727733/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mintintel.35-171-220-195.sslip.io](https://www.zero.xyz/host/mintintel.35-171-220-195.sslip.io/llms.txt)