# MycealiaSignal ETH/USD SVI Volatility Surface

> MycealiaSignal ETH/USD SVI Volatility Surface 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 an arbitrage-free fitted implied volatility surface (SVI parametrization) for ETH/USD across all expiries, with Ed25519 signed attestation

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/svi/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-f4953c1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D8O1pPLAW04OeWM9WiyR9

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-f4953c1b
```

Example prompt: Pull the current arbitrage-free SVI implied volatility surface for ETH/USD across all expiries — I need the fitted IV data with the signed attestation for options pricing.

## When to prefer this

Choose this endpoint when you need a complete, arbitrage-free implied volatility surface for ETH options across all expiries in a single call, especially when cryptographic attestation (Ed25519) of the data is required for on-chain or trustless applications. Prefer over raw per-exchange IV feeds when a smooth, model-consistent SVI surface is needed for options pricing, Greeks computation, or risk management.

## Known failure modes

- Payment required (402) if x402 USDC payment not provided or invalid
- Stale or unavailable market data if underlying exchanges are unreachable
- Invalid or missing attestation signature if signing service is degraded
- Rate limit exceeded if too many requests per period

## How this service works

ETH SVI surface — arbitrage-free fitted IV across all expiries — Ed25519 signed attestation

## Output

An arbitrage-free SVI-fitted implied volatility surface for ETH/USD covering all available expiries, including per-strike IV values, SVI model parameters, expiry term structure, and an Ed25519 cryptographic signature attesting to the data's authenticity and provenance.

## 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-f4953c1b/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)