Api Endpoint

web-production-18a32.up.railway.app

UK Stamp Duty Land Tax (SDLT) calculator with first-time buyer relief and surcharges.

Open interactive test console

Offering

Provider
web-production-18a32.up.railway.app
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Financial Analysis
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://web-production-18a32.up.railway.app/stamp-duty
MIME type
Not provided
First seen
2026-10-16T01:54:06.400Z
Last seen
Tags
Search, Utility

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.001 USDC
Atomic price: 1000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "payTo": "0xFFc458dB291b4ABcE020fE3de4f91F2770E537b1"
  }
]

Observed health

Status
Healthy
Latest latency
99 ms
Average latency
1473 ms
HTTP status
402
Last checked
Reachability
100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "POST",
        "PUT",
        "PATCH"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "type": "object",
      "properties": {
        "price": {
          "type": "number",
          "minimum": 0,
          "description": "Property purchase price in GBP."
        },
        "is_first_time_buyer": {
          "type": "boolean",
          "description": "First-time buyers get relief on properties up to £625,000."
        },
        "is_additional_property": {
          "type": "boolean",
          "description": "Second homes / buy-to-let pay a 5% surcharge (Oct 2024 rates)."
        },
        "is_non_resident": {
          "type": "boolean",
          "description": "Non-UK residents pay an extra 2% surcharge."
        }
      },
      "required": [
        "price"
      ]
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "price": {
          "type": "number"
        },
        "total_tax": {
          "type": "number",
          "description": "Total SDLT payable in GBP."
        },
        "effective_rate": {
          "type": "number",
          "description": "Effective tax rate as a percentage."
        },
        "breakdown": {
          "type": "array",
          "description": "Band-by-band breakdown."
        },
        "buyer_type": {
          "type": "string"
        }
      }
    }
  },
  "required": [
    "type"
  ]
}