# MESI — Mycelia Equity Stress Index

> MESI — Mycelia Equity Stress 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 a 0-100 composite equity stress index combining VIX, VVIX, IV/RV ratio, credit stress, and DXY momentum, with Ed25519-signed attestation and 300-second cache.

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/stress/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/mesi-mycelia-equity-stress-index-f26a74c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bx8VwLiEUpISX_-k8HgLZ

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 mesi-mycelia-equity-stress-index-f26a74c1
```

Example prompt: What's the current MESI equity stress reading — give me the 0-100 composite score combining VIX, VVIX, IV/RV, credit stress, and DXY momentum, with the signed attestation.

## When to prefer this

Choose this endpoint when you need a single, authoritative composite equity stress signal combining multiple volatility and credit dimensions (VIX, VVIX, IV/RV, credit spread stress, DXY momentum) into one 0-100 score with cryptographic attestation. Prefer this over single-factor vol signals when you need a holistic, tamper-evident equity risk reading suitable for automated trading decisions, risk dashboards, or downstream agent workflows that require verifiable data provenance.

## Known failure modes

- Payment not received or invalid x402 credentials — 402 Payment Required
- Upstream data source unavailable for one or more components (VIX, credit, DXY) — may return partial or error response
- Stale data within 300s cache window — consumer gets cached result, not real-time
- Network timeout or service unavailability — 503 or connection error
- Invalid request format — 400 Bad Request

## How this service works

MESI — Mycelia Equity Stress Index. VIX, VVIX, IV/RV ratio, credit stress, DXY momentum. 0-100 composite. 300s cache. — Ed25519 signed attestation

## Output

A 0-100 composite equity stress index score (MESI) derived from VIX, VVIX, implied-to-realized volatility ratio, credit stress, and DXY momentum, delivered with an Ed25519-signed attestation for verifiability. Response is cached for up to 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/mesi-mycelia-equity-stress-index-f26a74c1/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)