← The evidence ledger
Evidence row 119981
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://saylorinnovations.com/api/grid/uk-carbon
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 319ce104f45bf991e776b2ab9ab4a93f58fcc04b8df730e533dd190fbe2c63f1
- Leaf
- 0xa2fcced927ef4fd3bb75d8b7b5b762f847705a109e4d43a3bdf6a1f87367ef2c
What was observed
{
"endpoints": [
[
"x402",
"https://saylorinnovations.com/api/grid/uk-carbon"
]
],
"name": "Saylor Innovations Data Desk",
"owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:grid-uk-carbon",
"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:grid-uk-carbon",
"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:grid-uk-carbon",
"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": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
"memo": "saylor:datadesk:grid-uk-carbon",
"reference": "EetnwRYzxChrC8aoLbJiMCHB6HyxJ79NQZBqGz6xnjSv",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpncmlkLXVrLWNhcmJvbiIsInJlZmVyZW5jZSI6IkVldG53Ull6eENockM4YW9MYkppTUNIQjZIeXhKNzlOUVpCcUd6NnhualN2IiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI2NjU3MzgzMDd9.UGLrPFk8RTj5TSAISL3xIa8bQzY4HpRWDJRaxOaGA3I"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
"extra": {
"feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
"memo": "saylor:datadesk:grid-uk-carbon",
"reference": "3NgJ4maWghjL2qCTqQ51vcukgMzPt6Ax9nKc3wPyCzd6",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpncmlkLXVrLWNhcmJvbiIsInJlZmVyZW5jZSI6IjNOZ0o0bWFXZ2hqTDJxQ1RxUTUxdmN1a2dNelB0NkF4OW5LYzN3UHlDemQ2IiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRXM5dk1GcnphQ0VSbUpmckY0SDJGWUQ0S0NvTmtZMTFNY0NlOEJlbndOWUIiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI2NjU3MzgzMDh9.5DgvOLD9pj33YyhfVzEE9kFWT981uvorLykU22SQo3k"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "92760",
"asset": "So11111111111111111111111111111111111111112",
"extra": {
"memo": "saylor:datadesk:grid-uk-carbon",
"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": "95629",
"reference": "BKijQn5RpfwW4wJmpX487arBHJRY7LX3ZfzYjoo7PLca",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpncmlkLXVrLWNhcmJvbiIsInJlZmVyZW5jZSI6IkJLaWpRbjVScGZ3VzR3Sm1wWDQ4N2FyQkhKUlk3TFgzWmZ6WWpvbzdQTGNhIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjpudWxsLCJtaW5BbW91bnQiOjkyNzYwLCJleHAiOjE3OTI2NjU3MzgzMDh9.1_YpoxJHhECjpKJztbC1ygQGYPbOaFAIfse-MgdzLsU",
"solUsdPrice": 104.57
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
}
],
"description": "Great Britain grid carbon intensity - live gCO2/kWh, generation mix, renewable and fossil share, plus the greenest 3-hour window in the next 24 hours",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"type": "http"
},
"output": {
"example": {
"fossil_pct": 17.5,
"from": "2026-10-13T01:30Z",
"generation_mix": [
{
"fuel": "wind",
"pct": 64.4
},
{
"fuel": "gas",
"pct": 17.5
},
{
"fuel": "nuclear",
"pct": 13.3
},
{
"fuel": "biomass",
"pct": 4.7
},
{
"fuel": "coal",
"pct": 0
},
{
"fuel": "imports",
"pct": 0
},
{
"fuel": "other",
"pct": 0
},
{
"fuel": "hydro",
"pct": 0
},
{
"fuel": "solar",
"pct": 0
}
],
"intensity": {
"actual_gco2_kwh": 76,
"forecast_gco2_kwh": 73,
"index": "low"
},
"low_carbon_pct": 82.4,
"next_24h": {
"average_gco2_kwh": 60,
"greenest_3h_window": {
"avg_gco2_kwh": 33,
"from": "2026-10-13T11:30Z",
"to": "2026-10-13T14:30Z"
},
"highest": {
"from": "2026-10-14T01:30Z",
"gco2_kwh": 88,
"index": "low"
},
"lowest": {
"from": "2026-10-13T12:30Z",
"gco2_kwh": 31,
"index": "low"
}
},
"note": "gCO2 per kWh of electricity generated, half-hourly; index is very low, low, moderate, high or very high",
"region": "Great Britain",
"renewables_pct": 69.1,
"source": "National Grid ESO Carbon Intensity API",
"to": "2026-10-13T02:00Z"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"checked_at": {
"description": "Time the check was run (UTC)",
"type": [
"string",
"null"
]
},
"fossil_pct": {
"description": "Fossil, as a percentage",
"type": "number"
},
"from": {
"description": "Start of the range",
"type": [
"string",
"null"
]
},
"generation_mix": {
"description": "Generation mix",
"items": {
"properties": {
"fuel": {
"type": "string"
},
"pct": {
"type": "number"
}
},
"type": "object"
},
"type": "array"
},
"intensity": {
"type": "object"
},
"low_carbon_pct": {
"description": "Low carbon, as a percentage",
"type": "number"
},
"next_24h": {
"description": "Forecast summary for the next 24 hours",
"type": [
"object",
"null"
]
},
"note": {
"description": "Caveat or context for reading the result",
"type": [
"string",
"null"
]
},
"region": {
"description": "Region",
"type": "string"
},
"renewables_pct": {
"description": "Renewables, as a percentage",
"type": "number"
},
"source": {
"description": "Data source the values come from",
"type": [
"string",
"null"
]
},
"to": {
"description": "End of the range",
"type": [
"string",
"null"
]
}
},
"required": [
"intensity",
"generation_mix"
],
"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": "2026-10-22T10:40:18.34Z",
"quality": {
"l30DaysTotalCalls": 4,
"l30DaysUniquePayers": 3,
"lastCalledAt": "2026-10-22T10:40:18.009Z"
},
"resource": "https://saylorinnovations.com/api/grid/uk-carbon",
"serviceName": "Saylor Innovations Data Desk",
"tags": [
"carbon intensity",
"grid emissions",
"uk electricity",
"generation mix",
"green energy window"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Great Britain grid carbon intensity - live gCO2/kWh, generation mix, renewable and fossil share, plus the greenest 3-hour window in the next 24 hours"
}What the leaf hashes
{"body":"319ce104f45bf991e776b2ab9ab4a93f58fcc04b8df730e533dd190fbe2c63f1","id":119981,"kind":"listing","method":"baseline/1","observed_us":1793025617031254,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/grid/uk-carbon","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).
- 0xa2fd1598a94920f1c4f799478d2acb056c3efbccb2bfd2f63e17b2fc2fabd29f
- 0x88462f93a8c5a6ba344ae0300fcba90a830c045954d992315de8fca97f5fc21c
- 0x4834759234a2e2c0954adbc205e77420eefc3d80f403b55f4cb7eb81ac4812a6
- 0x45b2c09882cb44a55837c05e9583ba47a39ec8ba12b69a409d48ba869d6070c3
- 0x504ed5380b4543352120a6e516a6f99927a478e54d0aed3673d82fb817f046c5
- 0xb870beadd19d54f19201b852912ccb69c3d8cf0d7ab0c0b3b718a692b4d206bf
- 0x55ce8fa645ebf6b55467af217f8baa4ce3b063069422c4304d8eb024569be6d8
- 0x559f66c938d63130bd278f6e7559d4a13b8244edb5835e130cd83a7d962ebf3c
- 0x90fe940b62b346de0f43dea0b20cf04728ae612c4236ef08a243180ee51ec44e
- 0x7adfb47ecfda217ca42c908cb971dd1ceaa64411de0157e4eeeee4ba0ca9cfde
- 0xd2bc27d81a73a53b7c724da36f189ebdd2fef396490722c3ee66192b798d20d0
- 0x19537c574979327583a539261287714af2eee831125de819abab0f155acd3a75
- 0xc34c13c58ba9c342ea1b833ac1882a4aea22777c4fd1092b2f83d3bac6b9f845
- 0x428106f4ae4ec142f17aebf6fa50935242f8d3f1c211cf95d6351d03d11da2b7
- 0x62a900133713919f4eed33d8336876b7a6d538233b8a4f3ed03b29aa44f5bad0
- 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
- 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
- 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae