# MycелiaSignal USDC Best Yield Oracle

> MycелiaSignal USDC Best Yield Oracle 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 best available USDC supply yield rate across all DeFi protocols and chains, signed with Ed25519 attestation

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/defi/yield/best/usdc
- 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/myc-iasignal-usdc-best-yield-oracle-5f1eea09
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DKQYFH3qkBSXPIKEVdKXS

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 myc-iasignal-usdc-best-yield-oracle-5f1eea09
```

Example prompt: What's the best USDC supply yield available right now across all DeFi protocols and chains, and can you get me a signed attestation I can trust?

## When to prefer this

Use this endpoint when you need a single, authoritative, cryptographically attested answer to 'where is USDC yielding the most right now' without having to query each protocol individually. Ideal for agents managing treasury, optimizing stablecoin yield allocation, or any workflow requiring a tamper-evident signed oracle rather than an unsigned aggregate.

## Known failure modes

- Payment not processed — 402 response requiring $0.05 USDC payment via x402 protocol
- No yield data available — protocols temporarily unreachable
- Rate limit exceeded — too many requests in a short window
- Signature verification failure — Ed25519 attestation cannot be validated
- Stale data — underlying protocol feeds not refreshed recently

## How this service works

Best USDC supply yield across all protocols and chains — Ed25519 signed attestation

## Output

Returns the highest available USDC supply APY found across all monitored DeFi protocols and blockchains, including the protocol name, chain, yield rate, and an Ed25519 cryptographic signature attesting to the data's authenticity and freshness.

## 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/myc-iasignal-usdc-best-yield-oracle-5f1eea09/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)