HUD QCT & DDA Eligibility API and MCP server

API access

Your AI client reaches HUD QCT & DDA Eligibility through one ParcelOps MCP endpoint, so there is no separate key to hold for it and no per-source client to write. Reaching it takes no credentials of your own.

What this source cannot tell you

• ⚠ Anything outside United States areas represented in the 2026 HUD designation files. A request past that edge comes back empty rather than approximated.
• ⚠ Anything from before 2026.
• ⚠ Anything after 2026.
• ⚠ Anything HUD 2026 QCT and DDA designation files does not publish. ParcelOps returns this source as it stands and never fills a blank field from a different one.
• ⚠ This is an early geographic screen, not a binding LIHTC eligibility or eligible-basis determination.
• ⚠ A ZCTA is not a current USPS delivery ZIP Code.
• ⚠ Confirm the governing HUD notice, allocating agency rules, project timing, and project facts.

Methods (3)

A method is one call your agent can make against this source.

• checkEligibility

  read

  Check exactly one tract GEOID, ZCTA, or county FIPS against the 2026 files.

  FreshnessStatic (source-level)
  Input schema

  {
    "type": "object",
    "properties": {
      "year": {
        "type": "integer",
        "enum": [
          2026
        ]
      },
      "tractGeoid": {
        "type": "string",
        "pattern": "^\\d{11}$"
      },
      "zcta": {
        "type": "string",
        "pattern": "^\\d{5}$"
      },
      "countyFips": {
        "type": "string",
        "pattern": "^\\d{5}$"
      }
    },
    "required": [],
    "additionalProperties": false
  }

• searchDesignatedAreas

  read

  List a bounded set of QCT or DDA rows for one exact state or county.

  What you must providedesignation

  Records returnedhud-designated-area

  How to get more resultsoffset (offsetField: offset, limitField: limit)

  FreshnessStatic (source-level)
  Input schema

  {
    "type": "object",
    "properties": {
      "year": {
        "type": "integer",
        "enum": [
          2026
        ]
      },
      "designation": {
        "type": "string",
        "enum": [
          "qct",
          "dda"
        ]
      },
      "stateFips": {
        "type": "string",
        "pattern": "^\\d{2}$"
      },
      "countyFips": {
        "type": "string",
        "pattern": "^\\d{5}$"
      },
      "limit": {
        "type": "integer",
        "minimum": 1,
        "maximum": 100
      },
      "offset": {
        "type": "integer",
        "minimum": 0,
        "maximum": 10000
      }
    },
    "required": [
      "designation"
    ],
    "additionalProperties": false
  }

• getServiceInfo

  read

  Return pinned files, geography semantics, workbook limits, and legal-use notes.

  FreshnessStatic (source-level)
  Input schema

  {
    "type": "object",
    "properties": {},
    "required": [],
    "additionalProperties": false
  }

Where this source is used

• Housing program eligibility checks

  Check tax credit designations, rural program maps, and existing affordable inventory for an address from your own code.

• Residential real estate

  The parcel record, the housing programs that touch an address, and the conditions a buyer asks about.

• Realtors and brokerages

  The facts behind a listing, the programs a buyer may qualify for, and your own files in the same place.

• Is this address in a qualified census tract or difficult development area?