← The evidence ledger
Evidence row 120405
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://saylorinnovations.com/api/math/matrix
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 6b2f5f4aea1791026ff4aeb02ba9448eab846efd6ace7f8b87727922ec29bd98
- Leaf
- 0xb603a572a3e712050684939b4911407e0598ef406aa73fcfcc4d85305afde4f7
What was observed
{
"endpoints": [
[
"x402",
"https://saylorinnovations.com/api/math/matrix"
]
],
"name": "Saylor Innovations Data Desk",
"owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:matrix-tools",
"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:matrix-tools",
"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:matrix-tools",
"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": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88",
"memo": "saylor:datadesk:matrix-tools",
"reference": "85BphfCWVFtSAn898U15NjQxFah8R8HLPGkBsgoGyTDX",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazptYXRyaXgtdG9vbHMiLCJyZWZlcmVuY2UiOiI4NUJwaGZDV1ZGdFNBbjg5OFUxNU5qUXhGYWg4UjhITFBHa0JzZ29HeVREWCIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVQakZXZGQ1QXVmcVNTcWVNMnFOMXh6eWJhcEM4RzR3RUdHa1p3eVREdDF2IiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyMzc3NDY5OTk5fQ.jUVWZKgS-sb6edXIYHIUeWJt85BEhX-u4gswp0D9Zpk"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
"extra": {
"feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88",
"memo": "saylor:datadesk:matrix-tools",
"reference": "AaBvqViv2yTfJUotZ4yvLtY1nTYJmmzeSdwZGUghB2E4",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazptYXRyaXgtdG9vbHMiLCJyZWZlcmVuY2UiOiJBYUJ2cVZpdjJ5VGZKVW90WjR5dkx0WTFuVFlKbW16ZVNkd1pHVWdoQjJFNCIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVzOXZNRnJ6YUNFUm1KZnJGNEgyRllENEtDb05rWTExTWNDZThCZW53TllCIiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyMzc3NDY5OTk5fQ.E8ljsqLtQ4_L-Mso00Ts73h5T44K9pjyGQodQd1Yv44"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "92504",
"asset": "So11111111111111111111111111111111111111112",
"extra": {
"memo": "saylor:datadesk:matrix-tools",
"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": "95365",
"reference": "3vSTNGpH1b1vKFKGJZb3CjBnxkKfe2ZhSetsHbp8yif1",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazptYXRyaXgtdG9vbHMiLCJyZWZlcmVuY2UiOiIzdlNUTkdwSDFiMXZLRktHSlpiM0NqQm54a0tmZTJaaFNldHNIYnA4eWlmMSIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6bnVsbCwibWluQW1vdW50Ijo5MjUwNCwiZXhwIjoxNzkyMzc3NDY5OTk5fQ.uUDDXnML8zKY2B2Y1alRCAMHlpSsx31rEjepLldarlo",
"solUsdPrice": 104.86
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
}
],
"description": "Matrix calculator for up to 8x8 - determinant, inverse, rank, trace, transpose and the solution of the linear system Ax = b with a square matrix",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"b": "5,6",
"matrix": "[[1,2],[3,4]]"
},
"type": "http"
},
"output": {
"example": {
"cols": 2,
"determinant": -2,
"inverse": [
[
-2,
1
],
[
1.5,
-0.5
]
],
"invertible": true,
"rank": 2,
"rows": 2,
"solution": [
-4,
4.5
],
"source": "Gaussian elimination with partial pivoting",
"square": true,
"trace": 5,
"transpose": [
[
1,
3
],
[
2,
4
]
]
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"b": {
"description": "optional right-hand side vector to solve Ax = b",
"type": "string"
},
"matrix": {
"description": "JSON array of rows, up to 8x8, e.g. [[1,2],[3,4]]",
"type": "string"
}
},
"required": [
"matrix"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"cols": {
"description": "Number of columns",
"type": "number"
},
"determinant": {
"description": "Determinant, null for non-square matrices",
"type": [
"number",
"null"
]
},
"inverse": {
"description": "Inverse matrix, or null",
"type": [
"array",
"null"
]
},
"invertible": {
"description": "True when the matrix has an inverse",
"type": [
"boolean",
"null"
]
},
"rank": {
"description": "Rank, 1 is highest",
"type": "number"
},
"rows": {
"description": "List of rows",
"type": "number"
},
"solution": {
"description": "Solution vector of Ax = b, or null",
"type": [
"array",
"null"
]
},
"source": {
"description": "Data source the values come from",
"type": "string"
},
"square": {
"description": "True when the matrix is square",
"type": "boolean"
},
"trace": {
"description": "Sum of the diagonal, null for non-square matrices",
"type": [
"number",
"null"
]
},
"transpose": {
"description": "Transposed matrix",
"type": "array"
}
},
"required": [
"rows",
"cols",
"rank"
],
"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": "2026-10-19T02:35:50.036Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-10-19T02:35:49.788Z"
},
"resource": "https://saylorinnovations.com/api/math/matrix",
"serviceName": "Saylor Innovations Data Desk",
"tags": [
"determinant of a matrix",
"inverse of a 3x3 matrix",
"solve a system of linear",
"matrix rank calculator",
"transpose a matrix"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Matrix calculator for up to 8x8 - determinant, inverse, rank, trace, transpose and the solution of the linear system Ax = b with a square matrix"
}What the leaf hashes
{"body":"6b2f5f4aea1791026ff4aeb02ba9448eab846efd6ace7f8b87727922ec29bd98","id":120405,"kind":"listing","method":"baseline/1","observed_us":1793025618012455,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/math/matrix","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).
- 0xb60476ec51164e6757f4cf08ed09a5e7e5ccfd3aace83679da6163df1ec6f13c
- 0x3f408bee2440b17849ae150bcea74294dd95ae26f5a4039bf428eaedb7a6aee7
- 0xf75cadedc1de7a877a027458b98d16eb96bb34d9f613718be314bd64f1d7cb9e
- 0x799bec8ea4adc8ec4ce764239fdb6ac1ba91aefa3e836ebd6897b7fe3ff14a79
- 0x92cae4eb5b630b67bba953a99ecdf92c7c026c85afb5df149f42a29322ac85a7
- 0x7fafe2d94d8d38ade544bd1f6bd4700404f59d414177a1191ebcb3eb5c5f0406
- 0x1035438ecc8d5205c2522b69e612b2093d8dcdb5feb8b6dd188de9c451e21c8b
- 0xdbf98781c1f0eecfdedf54f895e818e26aa046e393a175ebc6273b46409f240f
- 0x8633a5cda531755faba1277f7dacbebfe7efbff11aa341081a1370d3c2506667
- 0x083b213d55f010a12e9f2c7182db3d2a36f1323ef61111ababe982fa9f8e6726
- 0xfa91c460bb9b05b6890b46e5326a89c9e487b6419bd4d84337c05040222a2e6c
- 0x17930d484cab3f6850715eb0b77dd189c3c06f975cf9def12285fde3eb9b4234
- 0x0d86419ca1dd0b62fd8b22ea2e8c74d441312cec3116a467bea429b43e026565
- 0x083427e39db4dd470662401f6db5db8fadf084fc4274cf8621b368416952b78b
- 0x1a74ed3b3756b9cd946da49701bcec120ec88645013da99fa9eea60b39e1a570
- 0x123ec8bee20ddc55223eeef5a4f4d6c4b6416515adbb911c56759f5cde56e452
- 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
- 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae