# Mycelia Signal USDC/USD Peg Oracle

> Mycelia Signal USDC/USD Peg 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 a cryptographically signed Ed25519 attestation of the current USDC/USD peg price from the Mycelia Signal oracle

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/price/usdc/usd
- 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-072f0fd6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_37HRG_NKCmew-XX3InRph

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-072f0fd6
```

Example prompt: Can you get me a signed oracle attestation of the current USDC/USD peg price — I need the Ed25519-verified price to confirm whether USDC is holding its dollar peg right now.

## When to prefer this

Use this endpoint when you need a cryptographically verifiable, signed price attestation for USDC/USD — particularly useful for DeFi applications, smart contract triggers, or any workflow requiring provable stablecoin peg data rather than a raw unsigned price. Prefer over unsigned feeds when auditability or on-chain verification is required.

## Known failure modes

- Payment not included or invalid x402 payment header — 402 Payment Required response
- Oracle data temporarily unavailable — 503 Service Unavailable
- Invalid or expired payment — 402 with payment details
- Network timeout — connection error before response

## How this service works

USDC stablecoin peg monitor — real-time Circle USDC deviation from $1.00 USD — Ed25519 signed attestation

## Output

Returns a signed oracle attestation containing the current USDC/USD price (expected near 1.0000), an Ed25519 cryptographic signature for verification, and a timestamp. The signature allows downstream consumers to verify the price data was produced by the Mycelia Signal oracle 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-072f0fd6/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)