x402datasource.com — pay-per-request data

Real-world data for agents,
billed per request.

This API provides structured, real-world data that agents can query on demand. No keys, no subscriptions, no accounts — each request is paid for at the time it is made using the x402 protocol, settled in USDC on-chain.

We add new data endpoints continuously. Point your agent at /.well-known/x402.json to always get the current endpoint list, pricing, and payment details in machine-readable form.

Available endpoints

GET /api/v1/demographics $0.01 / request

Population and median household income within a radius of an address or lat/lon

address string — Full street address including street number, name, city, and state (e.g. "1600 Pennsylvania Ave NW, Washington, DC 20500"). Alternative to lat/lon.
lat numeric — Latitude (alternative to address)
lon numeric — Longitude (alternative to address)
radius_miles numeric — Search radius in miles (default: 3, max: 31)
radius_meters numeric — Search radius in meters (max: 50000, cannot use with radius_miles)
vintage integer — ACS vintage year (default: most recent, available: 2022, 2023, 2024)
GET /api/v1/enhanced-demographics $0.05 / request

Comprehensive demographic, housing, education, and employment data within a radius of an address or lat/lon

address string — Full street address including street number, name, city, and state (e.g. "1600 Pennsylvania Ave NW, Washington, DC 20500"). Alternative to lat/lon.
lat numeric — Latitude (alternative to address)
lon numeric — Longitude (alternative to address)
radius_miles numeric — Search radius in miles (default: 3, max: 31)
radius_meters numeric — Search radius in meters (max: 50000, cannot use with radius_miles)
vintage integer — ACS vintage year (default: most recent, available: 2022, 2023, 2024)
GET /api/v1/property/tx/travis/lookup $0.05 / request

Search Travis County Texas (TCAD) property appraisal records by address

address string — Address to search for (e.g. "2433 RIDGEPOINT DR AUSTIN")

Response

{
    "results": [
        {
            "geo_id": "0143210001",
            "address": {
                "street": "2433 RIDGEPOINT DR",
                "city": "AUSTIN",
                "zip": "78754",
                "full": "2433 RIDGEPOINT DR"
            },
            "owner": "SMITH JOHN & JANE",
            "legal_description": "LOT 12 BLK A RIDGEPOINT SEC 2",
            "values": {
                "market": 485000,
                "appraised": 485000,
                "assessed": 432000,
                "land": 195000,
                "improvement": 290000,
                "homestead_cap_savings": 53000
            },
            "property": {
                "year_built": 1998,
                "improvement_sqft": 2100,
                "land_sqft": 7500,
                "land_acres": 0.1722,
                "price_per_sqft": 231
            },
            "exemptions": {
                "homestead": true,
                "over_65": false,
                "disabled_person": false,
                "disabled_veteran": false
            },
            "data_year": 2025
        }
    ],
    "count": 1,
    "query": "2433 RIDGEPOINT DR AUSTIN",
    "resolved_address": "2433 Ridgepoint Dr, Austin, TX 78754"
}
GET /api/v1/property/tx/travis/{propertyId} $0.05 / request

Look up a Travis County Texas property by its county-specific identifier (TCAD account number)

propertyId string — County-specific property identifier — TCAD account number for Travis County (e.g. "0100030203")

Response

{
    "geo_id": "0100030203",
    "address": {
        "street": "1105 S LAMAR BLVD",
        "city": "AUSTIN",
        "zip": "78704",
        "full": "1105 S LAMAR BLVD"
    },
    "owner": "DJB INVESTMENT PROPERTY LLC",
    "legal_description": "LOT 1-4 TEMPLER LOTS",
    "values": {
        "market": 4332066,
        "appraised": 4332066,
        "assessed": 4332066,
        "land": 4232160,
        "improvement": 99906,
        "homestead_cap_savings": 0
    },
    "property": {
        "year_built": 1984,
        "improvement_sqft": 17100,
        "land_sqft": 23512,
        "land_acres": 0.5399,
        "price_per_sqft": 253
    },
    "exemptions": {
        "homestead": false,
        "over_65": false,
        "disabled_person": false,
        "disabled_veteran": false
    },
    "data_year": 2025
}
GET /api/v1/property/tx/travis/nearby $0.05 / request

Find nearby Travis County Texas (TCAD) properties within a radius of a lat/lng point

lat numeric — Latitude
lng numeric — Longitude
radius integer — Search radius in meters (default: 300, max: 1000)

Response

{
    "results": [
        {
            "geo_id": "0143210001",
            "address": {
                "street": "2433 RIDGEPOINT DR",
                "city": "AUSTIN",
                "zip": "78754",
                "full": "2433 RIDGEPOINT DR"
            },
            "owner": "SMITH JOHN & JANE",
            "values": {
                "market": 485000,
                "appraised": 485000,
                "assessed": 432000,
                "land": 195000,
                "improvement": 290000,
                "homestead_cap_savings": 53000
            },
            "property": {
                "year_built": 1998,
                "improvement_sqft": 2100,
                "land_sqft": 7500,
                "land_acres": 0.1722,
                "price_per_sqft": 231
            },
            "exemptions": {
                "homestead": true,
                "over_65": false,
                "disabled_person": false,
                "disabled_veteran": false
            },
            "data_year": 2025,
            "distance_meters": 42.3
        }
    ],
    "count": 1,
    "center": {
        "lat": 30.2672,
        "lng": -97.7431
    },
    "radius_meters": 300
}
More endpoints are on the way — geographic data, financial data, public records, and more.

Payment

protocol x402 (HTTP 402 Payment Required)
asset USDC
network eip155:8453
pay to 0x3B9Ce6236F3973aE3f5BE1b630c76E5eA1153aE9
/.well-known/x402.json — machine-readable endpoint manifest