← The evidence ledger
Evidence row 120763
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://saylorinnovations.com/api/uk/house-prices
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- cad010cf00073b65a7e7e0056692853b37bed0ed1a5e2e9d575c70dc0aca182b
- Leaf
- 0x856348dd4e9f17468554d0fe7500f5d5e9886e3a265cafc2f452bf83137ca4b4
What was observed
{
"endpoints": [
[
"x402",
"https://saylorinnovations.com/api/uk/house-prices"
]
],
"name": "Saylor Innovations Data Desk",
"owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:uk-house-prices",
"name": "USD Coin",
"note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:8453",
"payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:uk-house-prices",
"name": "USD Coin",
"note": "Polygon settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:137",
"payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:uk-house-prices",
"name": "USD Coin",
"note": "Arbitrum settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:42161",
"payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
"memo": "saylor:datadesk:uk-house-prices",
"reference": "883Y1jVWorJnccTJPxgATV3DBdoCmAphMiKqpdk2oDwn",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazp1ay1ob3VzZS1wcmljZXMiLCJyZWZlcmVuY2UiOiI4ODNZMWpWV29ySm5jY1RKUHhnQVRWM0RCZG9DbUFwaE1pS3FwZGsyb0R3biIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVQakZXZGQ1QXVmcVNTcWVNMnFOMXh6eWJhcEM4RzR3RUdHa1p3eVREdDF2IiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyNDAyNDI5NjUzfQ.cCTb7nkgZa0wne167FbJ0DRuEf8nJl6DGGgB4XbvZCI"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
"extra": {
"feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
"memo": "saylor:datadesk:uk-house-prices",
"reference": "C1bsWPQvMvttvpcrhq1oMZh2W5wqjPtAUKVkFEWNRm2L",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazp1ay1ob3VzZS1wcmljZXMiLCJyZWZlcmVuY2UiOiJDMWJzV1BRdk12dHR2cGNyaHExb01aaDJXNXdxalB0QVVLVmtGRVdOUm0yTCIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVzOXZNRnJ6YUNFUm1KZnJGNEgyRllENEtDb05rWTExTWNDZThCZW53TllCIiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyNDAyNDI5NjUzfQ.qvDE5tqlR6IOhV8GmHuHNzMqNGXCLZKm7oGZ4zM9wFw"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "91690",
"asset": "So11111111111111111111111111111111111111112",
"extra": {
"memo": "saylor:datadesk:uk-house-prices",
"native": true,
"note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
"quotedLamports": "94526",
"reference": "6CZLJxp6qgKaSvXSd5HGfg88HQvJRvog2ogaeUym4ht2",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazp1ay1ob3VzZS1wcmljZXMiLCJyZWZlcmVuY2UiOiI2Q1pMSnhwNnFnS2FTdlhTZDVIR2ZnODhIUXZKUnZvZzJvZ2FlVXltNGh0MiIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6bnVsbCwibWluQW1vdW50Ijo5MTY5MCwiZXhwIjoxNzkyNDAyNDI5NjUzfQ.mf7PZmux9RvFZ_t12prorwyJm0R-83y6ctItQyG7fGs",
"solUsdPrice": 105.79
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
}
],
"description": "UK house price index by region from HM Land Registry - average price, annual and monthly change, sales volume and prices by property type and buyer type",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"months": "6",
"region": "london"
},
"type": "http"
},
"output": {
"example": {
"history": [
{
"average_price": null,
"cash_buyers_price": null,
"change_month_percent": null,
"change_year_percent": null,
"detached": null,
"first_time_buyer_price": null,
"flat": null,
"index": null,
"mortgage_buyers_price": null,
"sales_volume": null,
"semi_detached": null,
"terraced": null
},
{
"average_price": null,
"cash_buyers_price": null,
"change_month_percent": null,
"change_year_percent": null,
"detached": null,
"first_time_buyer_price": null,
"flat": null,
"index": null,
"mortgage_buyers_price": null,
"sales_volume": null,
"semi_detached": null,
"terraced": null
},
{
"average_price": null,
"cash_buyers_price": null,
"change_month_percent": null,
"change_year_percent": null,
"detached": null,
"first_time_buyer_price": null,
"flat": null,
"index": null,
"mortgage_buyers_price": null,
"sales_volume": null,
"semi_detached": null,
"terraced": null
},
{
"average_price": null,
"cash_buyers_price": null,
"change_month_percent": null,
"change_year_percent": null,
"detached": null,
"first_time_buyer_price": null,
"flat": null,
"index": null,
"mortgage_buyers_price": null,
"sales_volume": null,
"semi_detached": null,
"terraced": null
},
{
"average_price": null,
"cash_buyers_price": null,
"change_month_percent": null,
"change_year_percent": null,
"detached": null,
"first_time_buyer_price": null,
"flat": null,
"index": null,
"mortgage_buyers_price": null,
"sales_volume": null,
"semi_detached": null,
"terraced": null
},
{
"average_price": null,
"cash_buyers_price": null,
"change_month_percent": null,
"change_year_percent": null,
"detached": null,
"first_time_buyer_price": null,
"flat": null,
"index": null,
"mortgage_buyers_price": null,
"sales_volume": null,
"semi_detached": null,
"terraced": null
}
],
"latest": {
"average_price": null,
"cash_buyers_price": null,
"change_month_percent": null,
"change_year_percent": null,
"detached": null,
"first_time_buyer_price": null,
"flat": null,
"index": null,
"mortgage_buyers_price": null,
"sales_volume": null,
"semi_detached": null,
"terraced": null
},
"note": "HM Land Registry UK House Price Index; the newest month is provisional and revised as more sales register, so expect a one to two month lag.",
"region": "london",
"slug": "london",
"source": "HM Land Registry UK HPI"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"months": {
"description": "optional 1-36, default 12",
"type": "string"
},
"region": {
"description": "Region slug such as london, england, scotland, wales, greater-manchester (default united-kingdom)",
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"history": {
"description": "Historical values, in time order",
"items": {
"properties": {
"average_price": {
"description": "Average price"
},
"cash_buyers_price": {
"description": "Cash buyers price"
},
"change_month_percent": {
"description": "Change month, as a percentage"
},
"change_year_percent": {
"description": "Change year, as a percentage"
},
"detached": {
"description": "Average price of detached houses"
},
"first_time_buyer_price": {
"description": "First time buyer price"
},
"flat": {
"description": "Average price of flats"
},
"index": {
"description": "Index value"
},
"mortgage_buyers_price": {
"description": "Mortgage buyers price"
},
"sales_volume": {
"description": "Sales volume"
},
"semi_detached": {
"description": "Semi detached"
},
"terraced": {
"description": "Average price of terraced houses"
}
},
"type": "object"
},
"type": "array"
},
"latest": {
"description": "Most recent value or version",
"properties": {
"average_price": {
"description": "Average price"
},
"cash_buyers_price": {
"description": "Cash buyers price"
},
"change_month_percent": {
"description": "Change month, as a percentage"
},
"change_year_percent": {
"description": "Change year, as a percentage"
},
"detached": {
"description": "Average price of detached houses, null when not published"
},
"first_time_buyer_price": {
"description": "First time buyer price"
},
"flat": {
"description": "Average price of flats, null when not published"
},
"index": {
"description": "Index value"
},
"mortgage_buyers_price": {
"description": "Mortgage buyers price"
},
"sales_volume": {
"description": "Sales volume"
},
"semi_detached": {
"description": "Semi detached"
},
"terraced": {
"description": "Average price of terraced houses, null when not published"
}
},
"type": "object"
},
"note": {
"description": "Caveat or context for reading the result",
"type": "string"
},
"region": {
"description": "Region",
"type": "string"
},
"slug": {
"description": "URL-safe identifier",
"type": "string"
},
"source": {
"description": "Data source the values come from",
"type": "string"
}
},
"required": [
"region",
"latest",
"history"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791811517/bazaar-icons/bc5e2b3d111ebbef.jpg",
"lastUpdated": "2026-10-19T09:31:49.686Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-10-19T09:31:49.293Z"
},
"resource": "https://saylorinnovations.com/api/uk/house-prices",
"serviceName": "Saylor Innovations Data Desk",
"tags": [
"average house price in london",
"uk house price index latest",
"annual house price change",
"detached vs flat price uk",
"first time buyer average price"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "UK house price index by region from HM Land Registry - average price, annual and monthly change, sales volume and prices by property type and buyer type"
}What the leaf hashes
{"body":"cad010cf00073b65a7e7e0056692853b37bed0ed1a5e2e9d575c70dc0aca182b","id":120763,"kind":"listing","method":"baseline/1","observed_us":1793025618756796,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/uk/house-prices","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).
- 0x856344ac5682480bbc18f99206b7e8cb0995c165028284d1ed49af4216935493
- 0xd0f3f8eaaae9ddcf242a78b0d612cb98a7454021fee28e04a659e7b1cedc5f28
- 0x1ec1219121fff6c80946aa469a4b70cd9717580063702033968d7b10c83f75e2
- 0xee3f8208f54db18a3f9a7eeed89b8c337e5187af4b83194b327fcf4902270301
- 0xfdf8d21e1951136b20e0ce484cbab4fb5e1b4c8bc5bdfea89713a55f1be7a200
- 0x8e9a8cec7c5cb549535ea99e229ec4a18f25817fd1de5926617eafc7ef9e8ee8
- 0xf60ba86b0937ff8d2bc12d5fb32267f3ecedce0f4bddfc1d6671bf5d3d3b8768
- 0x98ac2c1b5fbeb50a0ef5fd46b4fb7debce878974ef9f74b374f213eb5e5d680a
- 0xa25c27caad0782fd630885837d1950f3c8b3a80ec48102ab3b7af1750a596166
- 0x57cf22ad94c4fd01cd46cc494037c1e1c1e5762f276a703f5e957ef32ad4aa0a
- 0x147021357b2eb773d60db74f751316bfd367b06080320d378c0c402240e98d59
- 0x146f43471a3bde6d8a04e87b6afd3ee6860c6e38a009f86aee705ce722b67748
- 0x91c2ae93ec20c7fed5088112fe3941ca622dfb3f8f1022c4844726c361244bd4
- 0x0eff463856b0992d53ab7d8c0b97c71541413358bdd445710c1e4b6aeb4d8f78
- 0x7eb603d37f0f22dae1ea013e391889906ffc0139ff26e25b044bee38eec8f9b2
- 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
- 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
- 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae