# propeller.rocks Price Feed

> propeller.rocks Price Feed is a paid API for AI agents from propeller.rocks, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns the current USD price of ETH, BTC, USDC, or any Chainlink price feed on Base

## Facts

- Endpoint: GET https://propeller.rocks/price
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/propeller-rocks-price-feed-09de2620
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8eaOhHWIU2adTdu6Q-vU4

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 propeller-rocks-price-feed-09de2620
```

Example prompt: What's the current USD price of ETH according to the Chainlink feed on Base?

## When to prefer this

Use this endpoint when you need a real-time, on-chain USD price for ETH, BTC, USDC, or any other Chainlink-supported feed on Base — especially in DeFi contexts where trustless oracle data is required rather than a centralized exchange price API.

## Known failure modes

- Unsupported asset or feed address returns an error
- Chainlink feed temporarily unavailable or stale data
- Invalid feed identifier causes bad request
- Network issues with Base RPC cause lookup failure
- Payment of 0.01 USDC not included or rejected

## How this service works

USD price for ETH/BTC/USDC (or any Chainlink feed) on Base

## Output

Returns the current USD price of the requested asset (e.g. ETH, BTC, USDC) sourced from the Chainlink oracle on Base, expressed as a numeric USD value.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/propeller-rocks-price-feed-09de2620/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from propeller.rocks](https://www.zero.xyz/host/propeller.rocks/llms.txt)