# Mycelia Signal ETH/USD Spot Price Oracle

> Mycelia Signal ETH/USD Spot Price Oracle is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Returns a cryptographically signed (Ed25519) attestation of the current ETH/USD spot price

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/price/eth/usd
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-myceliasignal-com-c6bd910d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TNVzr8OPnMMhkDo0-7qgL

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 api-myceliasignal-com-c6bd910d
```

Example prompt: What's the current ETH/USD spot price? I need a cryptographically signed attestation I can verify independently.

## When to prefer this

Choose this endpoint when you need a tamper-proof, cryptographically attested ETH/USD price — ideal for DeFi applications, smart contract inputs, audit trails, or any scenario where price data integrity must be independently verifiable via Ed25519 signature rather than trusted implicitly.

## Known failure modes

- Payment not included or invalid: 402 Payment Required — must supply $0.01 USDC via x402 protocol
- Network or upstream price feed unavailable: 503 Service Unavailable
- Rate limiting exceeded: 429 Too Many Requests
- Invalid endpoint path: 404 Not Found

## How this service works

Real-time Ethereum price in USD, aggregated from 9 exchanges including Binance, Coinbase and Kraken — Ed25519 signed attestation

## Output

A JSON response containing the current ETH/USD spot price along with an Ed25519 digital signature that allows the caller to cryptographically verify the authenticity and integrity of the price data, plus a timestamp indicating when the price was recorded.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## 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
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-myceliasignal-com-c6bd910d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.myceliasignal.com](https://www.zero.xyz/host/api.myceliasignal.com/llms.txt)