# Mycelia Signal MSSI Stress Index History

> Mycelia Signal MSSI Stress Index History is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Returns 56 days of historical MSSI (Mycelia Signal Stress Index) data with per-row Ed25519-signed attestations, decomposed into volatility, stablecoin, funding, and dispersion components

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/history/index/mssi
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mycelia-signal-mssi-stress-index-history-f6ca6d51
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EPRTaHj9tY5cyDPpYa2ya

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-mssi-stress-index-history-f6ca6d51
```

Example prompt: Pull the last 56 days of MSSI crypto stress index history from Mycelia Signal, including the volatility, stablecoin, funding, and dispersion component breakdowns for each day, with the Ed25519-signed attestations so I can verify the data.

## When to prefer this

Choose this endpoint when you need a multi-week historical view of aggregate crypto market stress with cryptographic attestations for auditability or on-chain use. Prefer it over raw price or volatility feeds when you need a pre-computed composite stress signal that already blends volatility, stablecoin flows, funding rates, and dispersion into a single index with verifiable provenance.

## Known failure modes

- Payment not received or x402 payment header missing — returns 402 Payment Required
- Upstream data source unavailable — may return partial history or 503
- Invalid or expired payment — returns 402 or 401
- Rate limiting if called too frequently — returns 429
- Signature verification failure on client side if public key mismatch

## How this service works

MSSI stress index history — 56 days, per-row original signatures. Vol, stablecoin, funding, dispersion components. — Ed25519 signed attestation

## Output

An array of up to 56 daily rows, each containing the composite MSSI stress index value along with its four sub-components (volatility, stablecoin, funding, dispersion), each row cryptographically signed with an Ed25519 attestation for tamper-evident verification.

## 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-mssi-stress-index-history-f6ca6d51/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)