# MyCeliaSignal BTC/EUR VWAP Oracle

> MyCeliaSignal BTC/EUR VWAP Oracle is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns the Bitcoin to Euro Volume-Weighted Average Price (VWAP) as a cryptographically signed Ed25519 attestation

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/price/btc/eur/vwap
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-myceliasignal-com-df3e3abf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yWl3m1l8_LU2t3vzYkcmy

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-df3e3abf
```

Example prompt: What's the current VWAP price of Bitcoin in euros? I need a cryptographically signed attestation I can verify.

## When to prefer this

Choose this endpoint when you need a cryptographically verifiable BTC/EUR VWAP price with an Ed25519 signed attestation — ideal for smart contracts, DeFi protocols, or any application requiring tamper-proof price data. Prefer this over simple spot price feeds when auditability and non-repudiation of the price quote are required. Use when your application needs to verify price integrity on-chain or in a trust-minimized environment.

## Known failure modes

- Payment required (402) if x402 payment header is missing or invalid
- Price feed temporarily unavailable due to upstream data source outage
- Invalid or expired Ed25519 signature if service key rotation occurred
- Rate limiting if too many requests are made in a short window
- Network timeout if oracle aggregation takes longer than expected

## How this service works

Bitcoin volume-weighted average price in EUR for European market execution — Ed25519 signed attestation

## Output

A JSON response containing the BTC/EUR VWAP price value along with an Ed25519 digital signature that cryptographically attests to the price data's authenticity and integrity, allowing downstream consumers to 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-df3e3abf/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)