# MyceliaSignal US Core CPI Oracle

> MyceliaSignal US Core CPI Oracle is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $1/call, status unknown (last checked 2026-09-13).

Returns the latest US Core CPI (Consumer Price Index excluding food and energy) as a cryptographically signed Ed25519 attestation

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/econ/us/cpi_core
- Price: $1/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-3ded356c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vSYaqFtNadlZ-D5m7g7FX

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-3ded356c
```

Example prompt: What's the latest US Core CPI reading? I need a cryptographically signed Ed25519 attestation I can verify for on-chain use.

## When to prefer this

Choose this endpoint when you need a tamper-evident, cryptographically signed US Core CPI value — particularly for smart contracts, DeFi protocols, or any system requiring verifiable off-chain economic data with an Ed25519 proof of authenticity. Prefer over raw data feeds when trust and non-repudiation matter.

## Known failure modes

- Payment not received — returns HTTP 402 if USDC payment of $1 is not attached
- Service unavailable — returns 5xx if the oracle backend is down or CPI data feed is stale
- Invalid request format — returns 400 if query parameters are malformed
- Data freshness issue — attestation may reference a prior BLS release if new data is not yet published

## How this service works

US Core CPI ex food and energy — key Fed inflation target for interest rate decisions — Ed25519 signed attestation

## Output

A JSON payload containing the current US Core CPI value (excluding food and energy), accompanied by an Ed25519 digital signature and metadata such as timestamp, enabling consumers to cryptographically verify the data's authenticity and integrity.

## 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-3ded356c/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)