← The evidence ledger
Evidence row 120009
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://saylorinnovations.com/api/health/running-pace
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 175eeed2dcd3729126c4a0aaa4a718d9e9ee986fa943cfc50485adecc7ee8302
- Leaf
- 0x1ba0e65b1551bf25cf610ba908e16deae1ac986050a3c19592b1d185ad4bfa6f
What was observed
{
"endpoints": [
[
"x402",
"https://saylorinnovations.com/api/health/running-pace"
]
],
"name": "Saylor Innovations Data Desk",
"owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:running-pace-pre",
"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:running-pace-pre",
"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:running-pace-pre",
"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:running-pace-pre",
"reference": "fdCNVrhE6KMHQ3o687ZUzYtxcRsE8tzWfGzQeHeCnL9",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpydW5uaW5nLXBhY2UtcHJlZGljdG9yIiwicmVmZXJlbmNlIjoiZmRDTlZyaEU2S01IUTNvNjg3WlV6WXR4Y1JzRTh0eldmR3pRZUhlQ25MOSIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVQakZXZGQ1QXVmcVNTcWVNMnFOMXh6eWJhcEM4RzR3RUdHa1p3eVREdDF2IiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyNTc1ODc4MDUyfQ.smLyu5wx21iUt7gQk2mnUbl8zHtilJkUgVPGCMAFvyw"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
"extra": {
"feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
"memo": "saylor:datadesk:running-pace-pre",
"reference": "AuqdDouYNAsKbhf4Gvgfows2L4PnyYm7G2a6E5kVjRDR",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpydW5uaW5nLXBhY2UtcHJlZGljdG9yIiwicmVmZXJlbmNlIjoiQXVxZERvdVlOQXNLYmhmNEd2Z2Zvd3MyTDRQbnlZbTdHMmE2RTVrVmpSRFIiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFczl2TUZyemFDRVJtSmZyRjRIMkZZRDRLQ29Oa1kxMU1jQ2U4QmVud05ZQiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5MjU3NTg3ODA1Mn0._KlgFRfoX9BcibmuhMFv_WsMIn7Me4uRxGuXXel0McY"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "90797",
"asset": "So11111111111111111111111111111111111111112",
"extra": {
"memo": "saylor:datadesk:running-pace-pre",
"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": "93606",
"reference": "9esaaFnisSPx2snC1xqfu6zTEnUsV5E5zMFJoWm2hiAb",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpydW5uaW5nLXBhY2UtcHJlZGljdG9yIiwicmVmZXJlbmNlIjoiOWVzYWFGbmlzU1B4MnNuQzF4cWZ1NnpURW5Vc1Y1RTV6TUZKb1dtMmhpQWIiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOm51bGwsIm1pbkFtb3VudCI6OTA3OTcsImV4cCI6MTc5MjU3NTg3ODA1Mn0.PMH-pC8UzLSccazJ3JrVsyzztjMYdaVyZU-gHqkapkA",
"solUsdPrice": 106.83
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
}
],
"description": "Running pace per km and mile and speed from distance and time, plus Riegel race predictions for the mile, 5K, 10K, half marathon and marathon.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"distance": "10",
"time": "52:30",
"unit": "km"
},
"type": "http"
},
"output": {
"example": {
"distance_meters": 10000,
"note": "Predictions use Riegel formula T2 = T1 x (D2/D1)^1.06. They assume similar training and conditions, and are least reliable far from the distance you ran.",
"pace_per_km": "5:15",
"pace_per_mile": "8:27",
"predictions": [
{
"distance_meters": 1609.344,
"pace_per_km": "4:42",
"pace_per_mile": "7:34",
"predicted_time": "7:34",
"race": "1 mile"
},
{
"distance_meters": 5000,
"pace_per_km": "5:02",
"pace_per_mile": "8:06",
"predicted_time": "25:11",
"race": "5K"
},
{
"distance_meters": 10000,
"pace_per_km": "5:15",
"pace_per_mile": "8:27",
"predicted_time": "52:30",
"race": "10K"
},
{
"distance_meters": 15000,
"pace_per_km": "5:23",
"pace_per_mile": "8:39",
"predicted_time": "1:20:41",
"race": "15K"
},
{
"distance_meters": 16093.44,
"pace_per_km": "5:24",
"pace_per_mile": "8:42",
"predicted_time": "1:26:56",
"race": "10 miles"
},
{
"distance_meters": 21097.5,
"pace_per_km": "5:29",
"pace_per_mile": "8:50",
"predicted_time": "1:55:50",
"race": "half marathon"
},
{
"distance_meters": 42195,
"pace_per_km": "5:43",
"pace_per_mile": "9:13",
"predicted_time": "4:01:31",
"race": "marathon"
}
],
"source": "Riegel race time prediction formula",
"speed_kmh": 11.429,
"speed_mph": 7.101,
"time": "52:30",
"time_seconds": 3150
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"distance": {
"description": "distance run",
"type": "string"
},
"time": {
"description": "finishing time as h:mm:ss, mm:ss or seconds",
"type": "string"
},
"unit": {
"description": "optional km, mi or m, default km",
"type": "string"
}
},
"required": [
"distance",
"time"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"distance_meters": {
"description": "Distance in metres",
"type": "number"
},
"note": {
"description": "Plain-language caveat about how to read and use the result",
"type": "string"
},
"pace_per_km": {
"description": "Minutes per kilometre",
"type": "string"
},
"pace_per_mile": {
"description": "Minutes per mile",
"type": "string"
},
"predictions": {
"description": "Predicted times for standard race distances",
"items": {
"properties": {
"distance_meters": {
"description": "Race distance in metres",
"type": [
"number",
"null"
]
},
"pace_per_km": {
"description": "Pace per kilometre at that time",
"type": [
"string",
"null"
]
},
"pace_per_mile": {
"description": "Pace per mile at that time",
"type": [
"string",
"null"
]
},
"predicted_time": {
"description": "Predicted finishing time",
"type": [
"string",
"null"
]
},
"race": {
"description": "Race name",
"type": [
"string",
"null"
]
}
},
"type": "object"
},
"type": "array"
},
"source": {
"description": "Where the data or formula comes from",
"type": "string"
},
"speed_kmh": {
"description": "Speed in kilometres per hour",
"type": "number"
},
"speed_mph": {
"description": "Speed in miles per hour",
"type": "number"
},
"time": {
"description": "Time formatted h:mm:ss",
"type": "string"
},
"time_seconds": {
"description": "Time in seconds",
"type": "number"
}
},
"required": [
"pace_per_km",
"predictions"
],
"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": "2026-10-21T09:42:38.091Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-10-21T09:42:37.861Z"
},
"resource": "https://saylorinnovations.com/api/health/running-pace",
"serviceName": "Saylor Innovations Data Desk",
"tags": [
"running pace calculator",
"predict marathon time",
"race time predictor",
"pace per mile from time",
"10k to half marathon time"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Running pace per km and mile and speed from distance and time, plus Riegel race predictions for the mile, 5K, 10K, half marathon and marathon."
}What the leaf hashes
{"body":"175eeed2dcd3729126c4a0aaa4a718d9e9ee986fa943cfc50485adecc7ee8302","id":120009,"kind":"listing","method":"baseline/1","observed_us":1793025617076436,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/health/running-pace","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).
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- 0xe5e0d272bcebe53e0a62e7234887fe2b3edd7e645b7258f1fa3057103b43c238
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- 0x453b383b9d23338f8749b2c30abeafab6dab4809209a54d1aa92152c69e3bc5f
- 0x6effb0a10986967a259530e249d9347c6020cdbc0b22a2b3d1bce549ada5d214
- 0xda23b9e857808d3b48f6f3793afe10d2a026feaee630bad6364b9e01ad32ce66
- 0x5f9cdb03d4c4571f3f261e9137452e9ac331e7dc65f7a692aebeab9c17109adf
- 0x2fcb74607806b919a93d344fc04e547b740967a7ec57f31eaf30f8328f809021
- 0x78207d584d8cbbec16d7e24b0f0d35715a871e920dadf13c271e874d2d6e1953
- 0xc9368fba7f6c13346c8b2c9c7a63691d3d68f63c71d1ec0d7a4decd43fb3e8c4
- 0x3f914e3a1f6c506299e42b0c551da50ec7ac2c0f0e69260eab2262111b4eb14b
- 0x7ab2e7902b312a74cfdbc32b2906ced29b1fb9dc4280b5378e8eb181ad88686e
- 0xe00c7829e46541e49a308807d357db902e06eff941a833217a8f0dbccd3964f1
- 0x770e4376196188c7fc9ec40f8e218dc0d1cb92bba5fe0425a0edce27ca9a997f
- 0x60582ab4b41e72eb70eb0bce07fbf0fb4d2b62a8bad5be50f5d16d511adc746c
- 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
- 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
- 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae