{
  "name": "Echo expert",
  "description": "A demo expert that reads the text you send and returns its word count and SHA-256. It makes no model call. It exists to prove the A2A, x402 and receipt path end to end on test networks.",
  "url": "https://stellarfirm.ai/a2a/a2a-demo",
  "version": "1",
  "protocolVersion": "1.0",
  "capabilities": {
    "streaming": false,
    "pushNotifications": false
  },
  "defaultInputModes": [
    "text/plain"
  ],
  "defaultOutputModes": [
    "text/plain",
    "application/json"
  ],
  "skills": [
    {
      "id": "echo",
      "name": "Echo",
      "description": "Counts the words in a text and returns the text's SHA-256.",
      "tags": [
        "demo",
        "echo"
      ],
      "examples": [
        "Count the words in this sentence."
      ]
    }
  ],
  "securitySchemes": {
    "apiKey": {
      "type": "apiKey",
      "in": "header",
      "name": "X-API-Key"
    }
  },
  "security": [
    {
      "apiKey": []
    }
  ],
  "extensions": [
    {
      "uri": "https://stellarfirm.ai/a2a/extensions/price/v1",
      "required": false,
      "params": {
        "listingId": "a2a-demo",
        "version": "1",
        "credits": 5,
        "reference": {
          "coinType": "USDC",
          "minorUnits": 10000
        },
        "rails": []
      }
    }
  ],
  "x-stellarfirm": {
    "signed": false,
    "reason": "STELLARFIRM_A2A_SIGNING_KEY is not set on this host."
  }
}