# Mycelia Signal MSXI BTC/USD Sentiment Index

> Mycelia Signal MSXI BTC/USD Sentiment Index 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 MSXI composite BTC/USD market sentiment index score (neutral/bullish/bearish regime) with Ed25519-signed attestation and component breakdown

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/sentiment/btc/usd
- 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/api-myceliasignal-com-ba86bae8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iZp0XvOEYNbeg_tiDZt1C

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-ba86bae8
```

Example prompt: What's the current MSXI Bitcoin sentiment regime — is BTC neutral, bullish, or bearish right now? I want the signed index value with confidence score and a breakdown of the funding rate, skew, PCR, term structure, and basis components.

## When to prefer this

Choose this endpoint when you need a cryptographically signed, multi-factor BTC/USD sentiment composite (not just price) that is verifiable on-chain or in smart contracts. Prefer this over raw price feeds when the use case requires regime classification (bullish/bearish/neutral), derivatives-derived sentiment signals (funding rate, skew, PCR, term structure, basis), or tamper-proof attestations for trustless downstream consumption. Not suitable if you only need spot price — use the price oracle endpoints for that.

## Known failure modes

- Payment failure (402): x402 micropayment not accepted or insufficient USDC — no data returned
- Degraded signal (degraded:true in response): one or more underlying data sources unavailable, index computed with reduced confidence
- Service unavailable (503/timeout): oracle backend unreachable
- Invalid signature verification: consumer-side key mismatch or payload tampering detected after receipt

## How this service works

MSXI Bitcoin market sentiment index — funding rate, long/short ratio, open interest momentum and liquidation signals combined — Ed25519 signed attestation

## Output

Returns a JSON object containing: sentiment index value (0-1 float), regime label (e.g. NEUTRAL/BULLISH/BEARISH), Ed25519 signature over a canonical string, signing public key, confidence score, degraded flag, individual component weights and values (funding rate, skew, put/call ratio, term structure, basis), computation timestamp, and method version. The canonical string and signature allow downstream consumers to cryptographically verify the attestation.

## 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-ba86bae8/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)