# Mycelia Signal Breadth Index (MSBI) — Equity Breadth Composite

> Mycelia Signal Breadth Index (MSBI) — Equity Breadth Composite 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 0-100 composite equity market breadth score combining sector participation above 20-day moving averages, RSP/SPY breadth momentum, and SPY price momentum, with Ed25519-signed attestation.

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/breadth/equity
- 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/mycelia-signal-breadth-index-msbi-equity-breadth-composite-98ce50c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LHkoQ-Tf1maTPmq7oyzFD

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 mycelia-signal-breadth-index-msbi-equity-breadth-composite-98ce50c6
```

Example prompt: What's the current equity market breadth score? I want to know if sectors are broadly participating above their 20-day moving averages and whether RSP/SPY momentum confirms the trend — give me the MSBI composite.

## When to prefer this

Use this endpoint when you need a single, cryptographically attested composite score for overall equity market health, particularly breadth across sectors relative to their 20-day moving averages. Prefer this over raw price feeds when you want a normalized 0-100 signal suitable for risk-on/risk-off decision logic, or when you need a verifiable (Ed25519-signed) breadth measurement for downstream audit trails.

## Known failure modes

- Payment not included or invalid x402 payment header — returns 402 Payment Required
- Upstream market data unavailable — may return 503 or stale cached data
- Attestation signing failure — may return incomplete or unsigned response
- Cache miss during high-load periods — slightly increased latency

## How this service works

MSBI — Mycelia Signal Breadth Index. Sector participation (% above 20DMA), RSP/SPY breadth momentum, SPY price momentum. 0-100 composite. 300s cache. — Ed25519 signed attestation

## Output

A 0-100 composite breadth index (MSBI) comprising: sector participation rate (% of sectors above 20DMA), RSP/SPY breadth momentum reading, and SPY price momentum — all aggregated into a single score and accompanied by an Ed25519 cryptographic signed attestation for verifiability. Response is cached for 300 seconds.

## 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/mycelia-signal-breadth-index-msbi-equity-breadth-composite-98ce50c6/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)