# Mycelia Signal XAU/EUR Gold Price Oracle

> Mycelia Signal XAU/EUR Gold 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 the current XAU/EUR (gold in euros) spot price as an Ed25519-signed cryptographic attestation

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/price/xau/eur
- 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-d3e10158
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aXiWgK0K63pali-qz6JGl

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-d3e10158
```

Example prompt: What's the current price of gold in euros? I need a cryptographically signed attestation I can trust — something Ed25519-verified from Mycelia Signal.

## When to prefer this

Choose this endpoint when you need a cryptographically verifiable gold (XAU) price denominated in euros, especially for use in smart contracts, DeFi protocols, auditable financial systems, or any context where tamper-evidence via Ed25519 signature is required. Prefer over unsigned price feeds when data integrity guarantees matter.

## Known failure modes

- Price data temporarily unavailable — upstream feed outage returns 503
- Payment not received or invalid x402 payment header — returns 402 Payment Required
- Rate limit exceeded — returns 429 Too Many Requests
- Malformed request — returns 400 Bad Request
- Signing service unavailable — attestation cannot be generated

## How this service works

Real-time gold spot price in EUR for European commodity exposure — Ed25519 signed attestation

## Output

Returns a signed price attestation containing the current XAU/EUR spot price along with an Ed25519 cryptographic signature, allowing consumers to verify data integrity and authenticity without trusting the transport layer.

## 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-d3e10158/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)