# Mycelia Signal MSVI ETH/USD Volatility Index Oracle

> Mycelia Signal MSVI ETH/USD Volatility Index Oracle is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Returns the MSVI (Mycelia Signal Volatility Index) for ETH/USD as a cryptographically signed Ed25519 attestation

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/volatility/eth/usd
- Price: $0.05/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-9e889da9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k6CBXjl9q23yVkSU1iQuS

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-9e889da9
```

Example prompt: What's the current MSVI volatility index for ETH/USD right now? I need the Ed25519-signed attestation so I can verify it on-chain.

## When to prefer this

Use this endpoint when you need a cryptographically verifiable, tamper-proof ETH/USD volatility index reading — particularly for smart contract integrations, DeFi protocols, or any use case where downstream consumers must independently verify data authenticity via Ed25519 signature. Prefer over generic market data APIs when on-chain or trustless verification is required.

## Known failure modes

- Payment not received or x402 payment flow incomplete — returns 402 Payment Required
- Rate limit exceeded — returns 429 Too Many Requests
- Upstream market data unavailable — returns 503 Service Unavailable
- Invalid payment token — returns 401 Unauthorized

## How this service works

MSVI Ethereum volatility index — composite of realized vol, implied vol, term structure, funding stress and put/call ratio — Ed25519 signed attestation

## Output

Returns the MSVI ETH/USD volatility index value as a signed attestation object including the numeric volatility score, Ed25519 digital signature, signer public key, and timestamp — allowing recipients to cryptographically verify the data has not been tampered with.

## 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-9e889da9/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)