{
  "openapi": "3.1.0",
  "info": {
    "title": "Market Evidence Check",
    "version": "1.0.0",
    "summary": "Read-only pre-execution evidence check using public OKX market data.",
    "description": "Checks whether a stated OKX instrument, side, and USDT notional fits a current public order-book snapshot under declared spread, quote-age, displayed-depth, and estimated one-way-cost limits. It never places orders and never accesses an account, wallet, private API, or API key. GO only means the current public snapshot passed the declared checks; it is not a trading recommendation, signal, profit prediction, or fill guarantee.",
    "contact": {
      "name": "Alpha Factory",
      "email": "founder@amzwatch.xyz",
      "url": "https://www.amzwatch.xyz/market-evidence-check/"
    },
    "license": {
      "name": "Connector use terms",
      "url": "https://www.amzwatch.xyz/market-evidence-check/terms.html"
    }
  },
  "servers": [
    {
      "url": "https://devday.167-179-82-72.nip.io",
      "description": "Market Evidence Check public read-only API"
    }
  ],
  "tags": [
    {
      "name": "health",
      "description": "Service liveness"
    },
    {
      "name": "evidence",
      "description": "Read-only market evidence checks"
    }
  ],
  "paths": {
    "/__devday_healthz": {
      "get": {
        "tags": [
          "health"
        ],
        "operationId": "getHealth",
        "summary": "Check service liveness",
        "responses": {
          "200": {
            "description": "Service is reachable.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/HealthResponse"
                },
                "example": {
                  "status": "ok",
                  "purpose": "prebuild-infrastructure"
                }
              }
            }
          }
        }
      }
    },
    "/v1/evidence/check": {
      "post": {
        "tags": [
          "evidence"
        ],
        "operationId": "checkEvidence",
        "summary": "Check one stated OKX order size against a current public snapshot",
        "description": "Uses only public OKX REST market data. No authentication, account, wallet, private API, or order capability is involved. Technical failures fail closed and never return GO.",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/EvidenceCheckRequest"
              },
              "examples": {
                "btcBuy1000": {
                  "summary": "Buy 1,000 USDT of BTC-USDT with the default 30 bps limit",
                  "value": {
                    "instrument": "BTC-USDT",
                    "side": "buy",
                    "notional_usdt": 1000,
                    "max_cost_bps": 30
                  }
                },
                "ethSell5000": {
                  "summary": "Sell 5,000 USDT of ETH-USDT",
                  "value": {
                    "instrument": "ETH-USDT",
                    "side": "sell",
                    "notional_usdt": 5000,
                    "max_cost_bps": 30
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "A complete snapshot report or a fail-closed technical-failure report. Inspect report_status and decision; do not treat HTTP 200 alone as GO.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/EvidenceReport"
                }
              }
            }
          },
          "400": {
            "description": "Invalid input. Decision is REJECT and no order or account action is possible.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/EvidenceErrorReport"
                }
              }
            }
          },
          "502": {
            "description": "Upstream public data unavailable in the current production mapping. Compatible clients should also handle the same EvidenceReport shape returned with HTTP 200 and report_status TECHNICAL_FAILURE.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/EvidenceReport"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "securitySchemes": {},
    "schemas": {
      "HealthResponse": {
        "type": "object",
        "required": [
          "status"
        ],
        "properties": {
          "status": {
            "type": "string",
            "example": "ok"
          },
          "purpose": {
            "type": "string",
            "example": "prebuild-infrastructure"
          }
        },
        "additionalProperties": true
      },
      "EvidenceCheckInputEcho": {
        "type": "object",
        "required": [
          "instrument",
          "side",
          "notional_usdt"
        ],
        "properties": {
          "instrument": {
            "type": "string",
            "example": "BTC-USDT"
          },
          "side": {
            "type": "string",
            "enum": [
              "buy",
              "sell"
            ]
          },
          "notional_usdt": {
            "type": "number",
            "example": 1000
          }
        },
        "additionalProperties": false
      },
      "CostAssumptions": {
        "type": "object",
        "description": "Optional caller assumptions. Omit to use policy defaults: taker fee 10 bps and slippage buffer 2 bps. Supplied values must be labelled caller assumptions, never account-observed fees.",
        "properties": {
          "taker_fee_bps": {
            "type": "number",
            "minimum": 0,
            "maximum": 1000,
            "default": 10
          },
          "slippage_buffer_bps": {
            "type": "number",
            "minimum": 0,
            "maximum": 1000,
            "default": 2
          }
        },
        "additionalProperties": false
      },
      "EvidenceCheckRequest": {
        "type": "object",
        "required": [
          "instrument",
          "side",
          "notional_usdt"
        ],
        "properties": {
          "instrument": {
            "type": "string",
            "minLength": 1,
            "maxLength": 64,
            "pattern": "^[A-Z0-9-]+$",
            "description": "OKX instrument ID, for example BTC-USDT, ETH-USDT, or BTC-USDT-SWAP.",
            "example": "BTC-USDT"
          },
          "side": {
            "type": "string",
            "enum": [
              "buy",
              "sell"
            ]
          },
          "notional_usdt": {
            "type": "number",
            "exclusiveMinimum": 0,
            "maximum": 1000000,
            "description": "Stated order notional in USDT. This is a hypothetical check size, not an instruction to trade.",
            "example": 1000
          },
          "max_cost_bps": {
            "type": "number",
            "minimum": 0,
            "maximum": 1000,
            "default": 30,
            "description": "Maximum acceptable estimated one-way execution cost in basis points."
          },
          "cost_assumptions": {
            "$ref": "#/components/schemas/CostAssumptions"
          }
        },
        "additionalProperties": false
      },
      "EvidenceReport": {
        "type": "object",
        "required": [
          "schema_version",
          "policy_version",
          "decision",
          "reason_codes",
          "report_status"
        ],
        "properties": {
          "schema_version": {
            "type": "string",
            "example": "1.0"
          },
          "policy_version": {
            "type": "string",
            "example": "2026-09-17.1"
          },
          "mode": {
            "type": "string",
            "example": "live_public"
          },
          "input": {
            "$ref": "#/components/schemas/EvidenceCheckInputEcho"
          },
          "instrument_metadata": {
            "type": [
              "object",
              "null"
            ]
          },
          "market_evidence": {
            "type": [
              "object",
              "null"
            ]
          },
          "execution_cost": {
            "type": [
              "object",
              "null"
            ]
          },
          "policy_checks": {
            "type": [
              "object",
              "null"
            ]
          },
          "decision": {
            "type": "string",
            "enum": [
              "GO",
              "WATCH",
              "REJECT"
            ]
          },
          "reason_codes": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "data_quality": {
            "type": [
              "object",
              "null"
            ]
          },
          "unverified_assumptions": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "evidence_hash": {
            "type": "string"
          },
          "request_id": {
            "type": "string",
            "format": "uuid"
          },
          "checked_at_utc": {
            "type": "string",
            "format": "date-time"
          },
          "report_status": {
            "type": "string",
            "enum": [
              "COMPLETE",
              "REJECTED_INPUT",
              "TECHNICAL_FAILURE"
            ]
          },
          "detail": {
            "type": "string"
          }
        },
        "additionalProperties": true
      },
      "EvidenceErrorReport": {
        "type": "object",
        "required": [
          "report_status",
          "decision",
          "reason_codes"
        ],
        "properties": {
          "schema_version": {
            "type": "string",
            "example": "1.0"
          },
          "policy_version": {
            "type": "string",
            "example": "2026-09-17.1"
          },
          "request_id": {
            "type": "string",
            "format": "uuid"
          },
          "checked_at_utc": {
            "type": "string",
            "format": "date-time"
          },
          "report_status": {
            "type": "string",
            "enum": [
              "REJECTED_INPUT"
            ]
          },
          "decision": {
            "type": "string",
            "enum": [
              "REJECT"
            ]
          },
          "reason_codes": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "status": {
            "type": "string",
            "example": "input_required"
          },
          "input_required": {
            "type": "object",
            "additionalProperties": true
          },
          "market_evidence": {
            "type": "null"
          },
          "execution_cost": {
            "type": "null"
          }
        },
        "additionalProperties": true
      }
    }
  },
  "security": []
}