{
  "openapi": "3.1.0",
  "info": {
    "title": "Sentinel - Robinhood Chain read-only API",
    "version": "1.0.0",
    "description": "Keyless, GET-only reads of Robinhood Chain (chainId 4663). Every response is block-stamped. No signing, no broadcasting, no safety verdicts."
  },
  "servers": [{ "url": "https://sentinelhood.com" }],
  "paths": {
    "/api/service": {
      "get": {
        "operationId": "sentinelRead",
        "summary": "Read network status, an address snapshot, a transaction receipt, or search Aeon skills",
        "parameters": [
          { "name": "action", "in": "query", "required": true, "schema": { "type": "string", "enum": ["network", "address", "transaction", "aeon"] } },
          { "name": "value", "in": "query", "required": false, "description": "address: 0x + 40 hex. transaction: 0x + 64 hex. aeon: query of 2-200 chars. Omit for network.", "schema": { "type": "string" } }
        ],
        "responses": {
          "200": { "description": "Block-stamped result. Includes chainId, block, checkedAt, source." },
          "400": { "description": "Invalid action or value", "content": { "application/json": { "schema": { "type": "object", "properties": { "error": { "type": "string" } } } } } },
          "405": { "description": "Only GET is supported" },
          "502": { "description": "Upstream RPC/Aeon unavailable, timed out, or chain mismatch" }
        }
      }
    }
  }
}