# Mycelia Signal GDP Growth Probability Distribution

> Mycelia Signal GDP Growth Probability Distribution is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).

Returns the annualized GDP growth probability distribution derived from Kalshi prediction markets, including expected value, entropy, and per-period implied distribution, with an Ed25519 signed attestation.

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/prediction/gdp
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mycelia-signal-gdp-growth-probability-distribution-da3d0bf8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xMENAVMo7SEujSOMaizbL

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-gdp-growth-probability-distribution-da3d0bf8
```

Example prompt: Pull the current Kalshi-based GDP annualized growth probability distribution for me — I want the expected value, the entropy measure of uncertainty, and the per-period implied distribution, all with a signed attestation I can verify.

## When to prefer this

Choose this endpoint when you need a probabilistic, market-implied view of GDP growth rather than a single-point official estimate. Ideal when you want prediction-market-derived distributions (not just BLS or Fed projections), need cryptographic attestation for auditability, or are building systems that require verifiable macro signals. Prefer over raw Kalshi scraping for convenience, signing, and structured output. Complement with the US unemployment rate endpoint from the same provider for a full Fed dual-mandate picture.

## Known failure modes

- Payment failure: x402 payment not accepted, returns 402 Payment Required
- Kalshi data unavailable: upstream prediction market data temporarily unavailable
- Stale data: distribution may reflect last available Kalshi snapshot if markets are closed
- Invalid request: malformed GET request returns 400 Bad Request
- Service unavailable: returns 503 if Mycelia Signal infrastructure is down

## How this service works

GDP annualized growth probability distribution from Kalshi — expected value, entropy, per-period implied distribution — Ed25519 signed attestation

## Output

A JSON response containing the annualized GDP growth probability distribution derived from Kalshi markets, including the expected value (mean implied growth rate), entropy (a measure of forecast uncertainty), and per-period implied probability distribution across growth scenarios. The response is accompanied by an Ed25519 signed attestation for cryptographic verification of data integrity and provenance.

## 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-gdp-growth-probability-distribution-da3d0bf8/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)