{
  "openapi": "3.1.0",
  "info": {
    "title": "Conversion Ledger RAD data API",
    "version": "1.0.0",
    "description": "Read-only JSON for HUD's Rental Assistance Demonstration: conversions (RAD Resource Desk export), housing authority records, 2026 RAD contract rents (HUD Look-Up Tool), program facts with citations and debt sizing. No key. Every response carries source, as-of date and the rad.loans page to cite. The same tools are available over MCP at https://rad.loans/mcp.",
    "contact": {
      "name": "Janover Capital LLC",
      "email": "hello@rad.loans",
      "url": "https://rad.loans/developers/"
    },
    "license": {
      "name": "CC BY 4.0 (compilation); HUD data public domain",
      "url": "https://creativecommons.org/licenses/by/4.0/"
    }
  },
  "servers": [
    {
      "url": "https://rad.loans/api/rad"
    }
  ],
  "paths": {
    "/conversions": {
      "get": {
        "operationId": "searchConversions",
        "summary": "Search RAD public housing conversions",
        "parameters": [
          {
            "name": "state",
            "in": "query",
            "required": false,
            "description": "Two-letter state code or name",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "query",
            "in": "query",
            "required": false,
            "description": "Words from the housing authority or project name",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "status",
            "in": "query",
            "required": false,
            "description": "closed or pipeline",
            "schema": {
              "type": "string",
              "enum": [
                "closed",
                "pipeline"
              ]
            }
          },
          {
            "name": "contract",
            "in": "query",
            "required": false,
            "description": "PBV or PBRA",
            "schema": {
              "type": "string",
              "enum": [
                "PBV",
                "PBRA"
              ]
            }
          },
          {
            "name": "tax_credits",
            "in": "query",
            "required": false,
            "description": "4%, 9% or None",
            "schema": {
              "type": "string",
              "enum": [
                "4%",
                "9%",
                "None"
              ]
            }
          },
          {
            "name": "fha_insured",
            "in": "query",
            "required": false,
            "description": "true for FHA-insured only",
            "schema": {
              "type": "boolean"
            }
          },
          {
            "name": "section18_blend",
            "in": "query",
            "required": false,
            "description": "true for RAD/Section 18 blends only",
            "schema": {
              "type": "boolean"
            }
          },
          {
            "name": "closed_after",
            "in": "query",
            "required": false,
            "description": "YYYY, YYYY-MM or YYYY-MM-DD",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "limit",
            "in": "query",
            "required": false,
            "description": "1 to 50 (default 10)",
            "schema": {
              "type": "integer",
              "minimum": 1,
              "maximum": 50
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Matching conversions, newest first",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object"
                }
              }
            }
          },
          "400": {
            "description": "Bad input"
          },
          "404": {
            "description": "Nothing matched"
          }
        }
      }
    },
    "/pha": {
      "get": {
        "operationId": "getHousingAuthority",
        "summary": "One housing authority's RAD record",
        "parameters": [
          {
            "name": "code",
            "in": "query",
            "required": false,
            "description": "HUD PHA code, e.g. IL002",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "url",
            "in": "query",
            "required": false,
            "description": "A rad.loans /pha/ page URL",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "name",
            "in": "query",
            "required": false,
            "description": "Housing authority name",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "state",
            "in": "query",
            "required": false,
            "description": "State, to narrow a name",
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "The housing authority record, or candidates when a name is ambiguous",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object"
                }
              }
            }
          },
          "400": {
            "description": "Bad input"
          },
          "404": {
            "description": "Nothing matched"
          }
        }
      }
    },
    "/rents": {
      "get": {
        "operationId": "getRadRents",
        "summary": "2026 RAD rents for unconverted public housing",
        "parameters": [
          {
            "name": "pic",
            "in": "query",
            "required": false,
            "description": "HUD PIC development number",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "project",
            "in": "query",
            "required": false,
            "description": "Project name",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "pha",
            "in": "query",
            "required": false,
            "description": "Housing authority name",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "state",
            "in": "query",
            "required": false,
            "description": "State",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "limit",
            "in": "query",
            "required": false,
            "description": "1 to 25",
            "schema": {
              "type": "integer"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Rent rows with caps and blend rents",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object"
                }
              }
            }
          },
          "400": {
            "description": "Bad input"
          },
          "404": {
            "description": "Nothing matched"
          }
        }
      }
    },
    "/size": {
      "get": {
        "operationId": "sizeRadDebt",
        "summary": "Size a RAD first mortgage",
        "parameters": [
          {
            "name": "units",
            "in": "query",
            "required": true,
            "description": "Units",
            "schema": {
              "type": "integer"
            }
          },
          {
            "name": "monthly_rent",
            "in": "query",
            "required": true,
            "description": "Contract rent per unit per month",
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "other_income",
            "in": "query",
            "required": false,
            "description": "Other income per unit per month",
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "vacancy_pct",
            "in": "query",
            "required": false,
            "description": "Vacancy and loss, percent (default 3)",
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "opex_per_unit",
            "in": "query",
            "required": false,
            "description": "Operating costs per unit per year (default 7200)",
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "reserves_per_unit",
            "in": "query",
            "required": false,
            "description": "Reserves per unit per year (default 350)",
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "value",
            "in": "query",
            "required": false,
            "description": "Value, for loan to value",
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "total_cost",
            "in": "query",
            "required": false,
            "description": "Total cost, for 221(d)(4) loan to cost",
            "schema": {
              "type": "number"
            }
          },
          {
            "name": "execution",
            "in": "query",
            "required": false,
            "description": "fha_223f, fha_221d4, freddie_section8 or fannie_preservation",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "rate",
            "in": "query",
            "required": false,
            "description": "Override rate, percent",
            "schema": {
              "type": "number"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Loan by execution with the binding test",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object"
                }
              }
            }
          },
          "400": {
            "description": "Bad input"
          },
          "404": {
            "description": "Nothing matched"
          }
        }
      }
    },
    "/facts": {
      "get": {
        "operationId": "getRadProgramFacts",
        "summary": "Current RAD program facts with sources",
        "responses": {
          "200": {
            "description": "Facts with primary sources",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object"
                }
              }
            }
          },
          "400": {
            "description": "Bad input"
          },
          "404": {
            "description": "Nothing matched"
          }
        }
      }
    }
  }
}