# MycелiaSignal BTC/USD Spot-Futures Basis & Carry Oracle

> MycелiaSignal BTC/USD Spot-Futures 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 BTC/USD spot-futures basis and annualized carry rate aggregated across 5 exchanges, delivered as an Ed25519-signed attestation.

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/basis/btc/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/myc-iasignal-btc-usd-spot-futures-basis-carry-oracle-b8d3be53
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9wgDeyP5mQmKN6Fyyzz0C

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-btc-usd-spot-futures-basis-carry-oracle-b8d3be53
```

Example prompt: What's the current BTC/USD spot-futures basis and annualized carry right now, aggregated across multiple exchanges, with a signed attestation I can verify?

## When to prefer this

Use this endpoint when you need a cryptographically attested, multi-exchange aggregated BTC/USD basis and carry figure — especially in DeFi, on-chain protocols, or any context where trust-minimized proof of the data is required. Prefer this over single-exchange REST feeds when you need signed provenance or cross-exchange consensus on the carry rate.

## Known failure modes

- Exchange data unavailable — one or more underlying exchanges unreachable, partial or no data returned
- Payment not processed — x402 payment required, 402 response if payment header missing or invalid
- Signature verification failure — Ed25519 attestation cannot be verified if key is stale
- Rate limiting — too many requests in a short window
- Stale data — if market feeds lag, basis figures may be slightly delayed

## How this service works

BTC/USD spot-futures basis and annualized carry across 5 exchanges — Ed25519 signed attestation

## Output

Returns the BTC/USD spot-futures basis (the price difference between spot and futures), the annualized carry rate expressed as a percentage, and data aggregated from 5 exchanges — all wrapped in an Ed25519-signed attestation for cryptographic verifiability.

## 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-btc-usd-spot-futures-basis-carry-oracle-b8d3be53/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)