# MyeliaSignal ETH/USD Basis & Carry Oracle

> MyeliaSignal ETH/USD Basis & Carry Oracle is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns the current ETH/USD basis and carry rate as a cryptographically signed Ed25519 attestation

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/basis/eth/usd
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/myeliasignal-eth-usd-basis-carry-oracle-9245746a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fNi5kTBHVVaV9IQboDhSC

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 myeliasignal-eth-usd-basis-carry-oracle-9245746a
```

Example prompt: What's the current ETH/USD basis and carry rate? I need it as a signed Ed25519 attestation I can verify on-chain.

## When to prefer this

Use this endpoint when you need a tamper-evident, cryptographically signed basis and carry reading for ETH/USD — particularly for DeFi protocols, smart contract inputs, or any application where verifiability of the data provenance matters. Prefer over unsigned feeds when auditability or on-chain verification is required.

## Known failure modes

- 503 if oracle data feed is temporarily unavailable
- 402 Payment Required if x402 payment header is missing or insufficient
- Invalid signature if the response is tampered with in transit
- Stale data if upstream price sources are delayed

## How this service works

Ethereum spot-futures basis and annualized carry — cross-venue arbitrage signal for basis traders — Ed25519 signed attestation

## Output

Returns the current ETH/USD basis (spread between spot and futures price) and carry rate, signed with an Ed25519 key for cryptographic verifiability. The attestation includes the data payload and signature so it can be trustlessly verified by smart contracts or off-chain systems.

## 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/myeliasignal-eth-usd-basis-carry-oracle-9245746a/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)