# MyCeliaSignal BTC SVI Volatility Surface

> MyCeliaSignal BTC 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 the Gatheral 2004 SVI arbitrage-free implied volatility surface for BTC/USD with smooth smile interpolation, delivered as an Ed25519-signed attestation

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/svi/btc/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-55ab0012
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wXfLCvZfZuKqH2epCHnUV

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-55ab0012
```

Example prompt: Can you pull the current Bitcoin implied volatility surface using the Gatheral SVI parameterization — I need the arbitrage-free smile interpolation with the Ed25519-signed attestation for BTC/USD?

## When to prefer this

Use this endpoint when you need a mathematically rigorous, arbitrage-free implied volatility surface for Bitcoin options, specifically parameterized using the Gatheral 2004 SVI model with smooth smile interpolation. Prefer this over raw per-strike IV endpoints when you need consistent, interpolatable surface data suitable for derivatives pricing models. The Ed25519 signed attestation makes it suitable for on-chain or trust-minimized applications requiring verifiable vol data.

## Known failure modes

- Payment not provided or insufficient USDC (x402 payment required error)
- Service temporarily unavailable due to exchange data feed disruption
- Invalid or missing query parameters
- Rate limit exceeded
- Stale data if upstream exchange feeds are lagging

## How this service works

BTC SVI surface — Gatheral 2004 arbitrage-free IV parameterization with smooth smile interpolation — Ed25519 signed attestation

## Output

Returns the Gatheral 2004 SVI (Stochastic Volatility Inspired) arbitrage-free implied volatility surface for BTC/USD, including per-strike IV parameters, smooth smile interpolation data, and an Ed25519 cryptographic signature attesting to the data integrity 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-55ab0012/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)