← The evidence ledger
Evidence row 119467
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://saylorinnovations.com/api/chain/blob-fee
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 55f6aafb73f075fede64493ca202ec96115dd78817ef11b0ffce76b4cad0440a
- Leaf
- 0xddc782518fbb5e02aae7bddb13b844afea67c2fa1eb9513a8099c0d383cf09ae
What was observed
{
"endpoints": [
[
"x402",
"https://saylorinnovations.com/api/chain/blob-fee"
]
],
"name": "Saylor Innovations Data Desk",
"owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:chain-blob-fee",
"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:chain-blob-fee",
"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:chain-blob-fee",
"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": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
"memo": "saylor:datadesk:chain-blob-fee",
"reference": "E4tWDtjua1nEohKwX1XPvjQFphVfBEPyaVvp3ErAARTQ",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1ibG9iLWZlZSIsInJlZmVyZW5jZSI6IkU0dFdEdGp1YTFuRW9oS3dYMVhQdmpRRnBoVmZCRVB5YVZ2cDNFckFBUlRRIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI2OTEzNzUwMTd9.Ll9W8Vd_KQGN0anaLIRFNBmJovEu2_8oF1Su-A9FuFM"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
"extra": {
"feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
"memo": "saylor:datadesk:chain-blob-fee",
"reference": "CoNcef9strRWZ9ouvSy2auHyVFKjgzTZRjeBBn92tzTh",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1ibG9iLWZlZSIsInJlZmVyZW5jZSI6IkNvTmNlZjlzdHJSV1o5b3V2U3kyYXVIeVZGS2pnelRaUmplQkJuOTJ0elRoIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRXM5dk1GcnphQ0VSbUpmckY0SDJGWUQ0S0NvTmtZMTFNY0NlOEJlbndOWUIiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI2OTEzNzUwMTd9.1A2b9wx2gaRxy7Kb11tgEfMvPgq2IKCEGrxNnzsSHF8"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "93511",
"asset": "So11111111111111111111111111111111111111112",
"extra": {
"memo": "saylor:datadesk:chain-blob-fee",
"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": "96404",
"reference": "9ozqR72CWWksCnjfH8RLH5wKdQWYDDhFQmAvCp3p24ri",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1ibG9iLWZlZSIsInJlZmVyZW5jZSI6IjlvenFSNzJDV1drc0NuamZIOFJMSDV3S2RRV1lERGhGUW1BdkNwM3AyNHJpIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjpudWxsLCJtaW5BbW91bnQiOjkzNTExLCJleHAiOjE3OTI2OTEzNzUwMTd9.1mS08scd2gP8zcIHvKKLhC9t3psb5AlQ-hDgGkyRO3Q",
"solUsdPrice": 103.73
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
}
],
"description": "Ethereum blob fee: EIP-4844 blob base fee in wei and gwei, cost of one and six blobs in ETH, blobs in the latest block and whether fees are rising.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"type": "http"
},
"output": {
"example": {
"blob_base_fee_gwei": 0.002178,
"blob_base_fee_wei": "2178390",
"blob_gas_used_latest": 524288,
"blob_target_per_block": 3,
"blobs_in_latest_block": 4,
"chain": "ethereum",
"chain_id": 1,
"cost_of_one_blob_eth": 2.8552593408e-7,
"cost_of_six_blobs_eth": 0.00000171315560448,
"excess_blob_gas": 170352461,
"execution_gas_price_gwei": 0.037133,
"latest_block": 26238052,
"note": "Blobs are the cheap data space rollups use to post data to Ethereum. The blob fee is separate from the normal gas price and moves with its own base-fee rule around a target of 3 blobs per block. The target shown is the value from the Dencun upgrade; later upgrades can change it.",
"pressure": "above target: blob fee rising",
"source": "Ethereum JSON-RPC"
},
"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": {
"blob_base_fee_gwei": {
"description": "blob base fee in gwei",
"type": "number"
},
"blob_base_fee_wei": {
"description": "blob base fee in wei, as a string",
"type": "string"
},
"blob_gas_used_latest": {
"description": "blob gas used by the latest block",
"type": [
"number",
"null"
]
},
"blob_target_per_block": {
"description": "target blobs per block used for the pressure label",
"type": "number"
},
"blobs_in_latest_block": {
"description": "blobs used by the latest block",
"type": [
"number",
"null"
]
},
"chain": {
"description": "the chain name that was queried",
"type": "string"
},
"chain_id": {
"description": "EIP-155 chain id of that network",
"type": "number"
},
"cost_of_one_blob_eth": {
"description": "cost of one blob (131,072 blob gas) in ETH",
"type": "number"
},
"cost_of_six_blobs_eth": {
"description": "cost of six blobs in ETH",
"type": "number"
},
"excess_blob_gas": {
"description": "excess blob gas carried in the latest header",
"type": [
"number",
"null"
]
},
"execution_gas_price_gwei": {
"description": "normal gas price, gwei",
"type": [
"number",
"null"
]
},
"latest_block": {
"description": "latest block number",
"type": [
"number",
"null"
]
},
"note": {
"description": "plain-language reading of the result, including units",
"type": "string"
},
"pressure": {
"description": "whether blob demand is above or below target",
"type": [
"string",
"null"
]
},
"source": {
"description": "where the data was read from",
"type": "string"
}
},
"required": [
"chain",
"chain_id",
"blob_base_fee_wei",
"blob_base_fee_gwei",
"cost_of_one_blob_eth",
"note",
"source"
],
"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/v1792548358/bazaar-icons/bc5e2b3d111ebbef.jpg",
"lastUpdated": "2026-10-22T17:47:35.065Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-10-22T17:47:34.649Z"
},
"resource": "https://saylorinnovations.com/api/chain/blob-fee",
"serviceName": "Saylor Innovations Data Desk",
"tags": [
"ethereum blob fee",
"eip4844 blob base fee",
"rollup data cost",
"blob gas price",
"cost per blob"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Ethereum blob fee: EIP-4844 blob base fee in wei and gwei, cost of one and six blobs in ETH, blobs in the latest block and whether fees are rising."
}What the leaf hashes
{"body":"55f6aafb73f075fede64493ca202ec96115dd78817ef11b0ffce76b4cad0440a","id":119467,"kind":"listing","method":"baseline/1","observed_us":1793025615647848,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/chain/blob-fee","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).
- 0xddc85e86b559b2eec1b80a619ae4a004931a76fdf72fc93464af2f102120239f
- 0x52998b1451ef57ee23c7240a6bb94a75fc2b972ed70d7513c6974a9bf3e2ea12
- 0x575a6ab1662cb8dc86143fd461ddd8729fe69b1513e49c1f08f6aeef78c83f67
- 0x9f99996e2eefce20e5d9055a55d6505879f9748d8426e5b4ea307d274262f091
- 0x954fedfcc793aba8a637a1f7053df19e2422e73718c3f3b6e2e58894ab7af0ea
- 0xcb0aa19bf20cef36e1887909c32c94170da3a40c3d0b17b0d9ecdb95e676e956
- 0x6a9a634616ae2ea4b708ffe2bb5d3e22b9add2af511fef1505e60dd338d9d71a
- 0x267c265480481b651455e1b1f314d755f814484159310ea14b2c39d402cbba80
- 0x75603e0bc39bff178058be49fe3d214497b429632b21257d96a58d03518820eb
- 0x9e12b03634af77909075d9c2c5d9f197c59da4d058d2a5236adf85bbfe79d779
- 0xc304d8ab49bd718a38dddb85fcb5c694094ddf3a5df4ec3ea86014a4eacd847c
- 0xd5d3f9a510ef9bc1156a86fc24b9d0c3a67b96d7c1dad1563f35f879e0ac9b4b
- 0xa4edde833302b48399053e2519aea1aed1074cd102bf4b553643df1866cce4ec
- 0x0b7541c75cc482a7134110311d7dbd02095d969ba21177de9b21a52a55981718
- 0x6dc40f983a3840a0ad927a9ca17f4ff1e3b649a6c735e2a09b140db7c2caf13b
- 0x703f95866af09c5e5d6ead7411e9a10f964a41a2aff64d4a55ff0053c023a023
- 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
- 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae