# MycEliaSignal DeFi USDC Yield Rate Comparator

> MycEliaSignal DeFi USDC Yield Rate Comparator 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 a cryptographically signed comparison of USDC lending/borrowing rates across all major DeFi protocols

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/defi/yield/compare
- 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/myceliasignal-defi-usdc-yield-rate-comparator-dd5fe2b7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I3v3fFAExV6BE2zcgX9hI

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 myceliasignal-defi-usdc-yield-rate-comparator-dd5fe2b7
```

Example prompt: Show me a signed comparison of USDC lending rates across all DeFi protocols right now — I want to know which one is offering the best yield.

## When to prefer this

Use this endpoint when you need a cryptographically attested, multi-protocol USDC yield comparison in a single call — ideal for DeFi portfolio optimizers, yield aggregators, or smart contract systems that require signed oracle data to trustlessly verify rates on-chain or off-chain.

## Known failure modes

- Rate data unavailable due to RPC/node issues — returns 503 or partial data
- Invalid or expired Ed25519 signature if signing key rotated
- Payment of 0.05 USDC not received — returns 402 Payment Required
- Protocol data source lag causing stale rates
- No query params required but malformed request returns 400

## How this service works

USDC rate comparison across all DeFi lending protocols — Ed25519 signed attestation

## Output

A cryptographically signed (Ed25519) payload listing current USDC lending/supply APY rates across multiple DeFi lending protocols (e.g. Aave, Compound, Morpho), enabling verifiable rate comparison to identify the best yield opportunity for USDC.

## 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/myceliasignal-defi-usdc-yield-rate-comparator-dd5fe2b7/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)