County Property Owner & Assessor Data Lookup

Real Estate

Operated by Sourcelane✓ verified

A property data lookup connector that queries official county assessor and property appraiser open-data feeds to return owner identity and mailing address (when published), situs (property) address, parcel identifier and a county record link, assessed value and valuation data, land use / property type, building characteristics such as year built and living area, and lot size. The connector matches by house number plus street name against county bulk GIS and assessor services (the same sources used by county map viewers), produces one record per matching parcel or unit for multi-unit buildings, and populates any unavailable attributes as null. Coverage is provided per-county with source-specific field availability and provenance tied to each county assessor/appraiser feed.

Verified Sep 28, 12:10 AM

$0.008

per parcel record

Up to 100 per call. Only pay for results returned; failed calls are refunded.

What people use it for

Real estate investor lead generation: identify owners of vacant lots, distressed properties, or off-market addresses.
Skip tracing: obtain owner mailing addresses as a starting point for direct-mail outreach.
Property research and due diligence prior to making an offer.
Portfolio and comparable-property research: retrieve assessed values and building details for lists of addresses.

Trust & reliability

7d uptime trend

Window	Uptime	Success rate	p50	p95
24h	—	—	—	—
7d	—	—	—	—
30d	—	—	—	—

Calling contract

Call it through Sourcelane's gateway or MCP server. We run the connector, apply your agent's spend guardrails, and bill only the results returned.

Call it via Sourcelane

curl -X POST https://cool-puffin-608.convex.site/v1/call \
  -H "Authorization: Bearer sl_live_your_agent_key" \
  -H "Content-Type: application/json" \
  -d '{"listing":"county-property-owner-scraper","params":{"county":"harris-tx","address":"2701 Westheimer","maxItems":5},"maxResults":10}'

Request params

Field	Type	Required	Description
`county`	string	required	Which county assessor open-data feed to search.
`address`	string	required	Street address or partial address to search, e.g. '2701 Westheimer' or '801 Biscayne Blvd'. Leave off city/state/zip — matching is by house number + street name within the selected county only. A partial street name (no house number) returns every parcel on that street, up to Max Items.
`maxItems`	integer	optional	Maximum number of matching parcel records to return. Set 0 for the source service's own cap (1000). Capped at 100 per call.

Each result contains

Field	Type	Description
`county`	string	County
`parcelId`	string	Parcel Id
`ownerName`	string	Owner Name
`ownerMailingAddress`	string	Owner Mailing Address
`situsAddress`	string	Situs Address
`assessedValue`	integer	Assessed Value
`landUse`	string	Land Use
`yearBuilt`	integer	Year Built
`livingAreaSqft`	integer	Living Area Sqft
`lotSizeSqft`	integer	Lot Size Sqft
`url`	string	Url

Use County Property Owner & Assessor Data Lookup from Claude, ChatGPT or Cursor

Pick your tool and connect in under a minute. Then just ask — for example: “List 3-bed homes under $600k in Austin that have been on the market for 60+ days.”

Connect Claude

Web, desktop and mobile. Paste one URL.

1Copy your personal connector URL
2In Claude open Settings → Connectors → Add custom connector
3Paste the URL and click Add — done

Manual setup (config files, REST, Python) +

Claude Code

Adds the Sourcelane MCP server with your key as a header.

terminal

claude mcp add --transport http sourcelane https://cool-puffin-608.convex.site/mcp \
  --header "Authorization: Bearer sl_live_your_agent_key"

Claude Desktop (config file)

Alternative to the connector URL: add to claude_desktop_config.json, then restart Claude.

claude_desktop_config.json

{
  "mcpServers": {
    "sourcelane": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://cool-puffin-608.convex.site/mcp",
        "--header",
        "Authorization:${AUTH_HEADER}"
      ],
      "env": {
        "AUTH_HEADER": "Bearer sl_live_your_agent_key"
      }
    }
  }
}

Cursor & Windsurf

Add to ~/.cursor/mcp.json (or Windsurf's mcp_config.json).

mcp.json

{
  "mcpServers": {
    "sourcelane": {
      "url": "https://cool-puffin-608.convex.site/mcp",
      "headers": {
        "Authorization": "Bearer sl_live_your_agent_key"
      }
    }
  }
}

VS Code

Save as .vscode/mcp.json. VS Code prompts for your key once.

.vscode/mcp.json

{
  "servers": {
    "sourcelane": {
      "type": "http",
      "url": "https://cool-puffin-608.convex.site/mcp",
      "headers": {
        "Authorization": "Bearer ${input:sourcelane-key}"
      }
    }
  },
  "inputs": [
    {
      "type": "promptString",
      "id": "sourcelane-key",
      "description": "Sourcelane agent key",
      "password": true
    }
  ]
}

ChatGPT Custom GPT (Actions)

Create a GPT → Actions → Import from URL, then Authentication: API Key, Bearer.

OpenAPI schema URL

https://sourcelane-amber.vercel.app/openapi.json

REST

One POST. Pass maxResults to cap cost.

curl

curl -X POST https://cool-puffin-608.convex.site/v1/call \
  -H "Authorization: Bearer sl_live_your_agent_key" \
  -H "Content-Type: application/json" \
  -d '{"listing":"county-property-owner-scraper","params":{"county":"harris-tx","address":"2701 Westheimer","maxItems":5},"maxResults":10}'

Python, LangChain, CrewAI, OpenAI Agents SDK…

Wrap the REST call as a tool, or point an MCP client at the endpoint.

python

import requests

res = requests.post(
    "https://cool-puffin-608.convex.site/v1/call",
    headers={"Authorization": "Bearer sl_live_your_agent_key"},
    json={
        "listing": "county-property-owner-scraper",
        "params": {"county":"harris-tx","address":"2701 Westheimer","maxItems":5},
        "maxResults": 10,
    },
    timeout=300,
)
body = res.json()
print(body["receipt"]["chargedMicros"], "micro-USD for", body["receipt"]["results"], "results")
print(body["data"])

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