← The evidence ledger
Evidence row 2199941
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://agents.avasis.ai/v1/base/fee-plan
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- c52ce4ce89426c718c71538246e25bd9f9518ca5910273be70197222ae250ac7
- Leaf
- 0x86e62e49b8e987ac66700580cc5ff44893a7cb679d7c3412b3fa6ef695773492
What was observed
{
"endpoints": [
[
"x402",
"https://agents.avasis.ai/v1/base/fee-plan"
]
],
"name": "Avasis Agent Platform",
"owner_address": "0x6264191d6dd5427435b5e829077842e130ef1fc8",
"raw": {
"accepts": [
{
"amount": "20000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:8453",
"payTo": "0x6264191D6dD5427435B5E829077842e130Ef1fc8",
"scheme": "exact"
}
],
"description": "Base gas fee plan for ONE transaction ($0.02): give gas_limit (+ urgency low/normal/high/next_block, optional max_usd budget, calldata_bytes for the L1 fee) and get the EIP-1559 fields to sign (maxFeePerGas, maxPriorityFeePerGas, hex ready_to_sign), expected + max cost in ETH + USD, blocks to inclusion, the other tiers, and a send_now / downgrade / wait decision with its reason from the latest block's fill. Free live sample /v1/evm/fee-plan/sample. Upstream down 503, never charged.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"calldata_bytes": 200,
"gas_limit": 65000,
"urgency": "normal"
},
"type": "http"
},
"output": {
"example": {
"also_try": [
{
"free_sample": "https://agents.avasis.ai/v1/evm/gas-ops/sample",
"price_usd": "0.05",
"url": "https://agents.avasis.ai/v1/evm/gas-ops",
"what": "EVM gas ops kit: Ethereum gas + Base gas fee tiers (slow/standard/fast/urgent), EIP-1559 next base fee, USD cost per tx and for your gas_limit, Base-vs-Ethereum pick, plus Solana slot / priority fees / SOL-USD; one shot, $0.05"
},
{
"free_sample": "https://agents.avasis.ai/v1/evm/tx-precheck/sample",
"price_usd": "0.02",
"url": "https://agents.avasis.ai/v1/base/tx-precheck",
"what": "Base tx precheck: simulate YOUR unsigned transaction before you sign (would it revert + reason, gas in USD, every transfer, approval exposure, counterparty risk): SIGN / CAUTION / BLOCK"
}
],
"alternatives": [
{
"blocks": [
2,
10
],
"expected": {
"eth": 1.69e-7,
"usd": 0.000436104
},
"maxFeePerGas": {
"gwei": 0.002863
},
"tier": "slow",
"urgency": "low"
},
{
"blocks": [
1,
1
],
"expected": {
"eth": 2.34e-7,
"usd": 0.000603837
},
"maxFeePerGas": {
"gwei": 0.0057
},
"tier": "fast",
"urgency": "high"
},
{
"blocks": [
1,
1
],
"expected": {
"eth": 2.665e-7,
"usd": 0.000687703
},
"maxFeePerGas": {
"gwei": 0.0083
},
"tier": "urgent",
"urgency": "next_block"
}
],
"chain": "base",
"chainId": 8453,
"computedAt": "2026-10-29T12:00:00.500Z",
"decision": {
"action": "send_now",
"reason": "standard tier for normal urgency: latest block 14.2% full vs 16.67% target, base fee falling (-0.0592% next block); expected $0.00052 for 65000 gas, typically 1-2 blocks (~2-4 s)",
"requested_tier": "standard",
"tier": "standard"
},
"eth_usd": {
"available": true,
"price": 2580.5,
"source": "chainlink ETH/USD aggregator on Base (latestRoundData)"
},
"headline": "Base: standard tier (normal urgency) = maxFee 0.0052 gwei / tip 0.001 gwei, ~$0.00052 for 65000 gas, ~1-2 blocks · send now",
"how_to_use": [
"Type-2 (EIP-1559) transaction: copy ready_to_sign.maxFeePerGas and maxPriorityFeePerGas (hex wei) into your transaction with your to / value / data / nonce; decision.action says send_now, downgrade (a cheaper tier fits max_usd) or wait (re-quote after recheck_in)."
],
"inputs": {
"calldata_bytes": 200,
"gas_limit": 65000,
"max_usd": null,
"urgency": "normal"
},
"kit": "evm-fee-plan-1",
"l1_data_fee": {
"applicable": true,
"available": true,
"bytes": 200,
"eth": 8.04958e-10,
"usd": 0.00000207719
},
"market": {
"base_fee": {
"gwei": 0.0021
},
"block": {
"ageSeconds": 1,
"gasUsedPct": 14.2,
"number": 37400000,
"timestamp": 1761739199
},
"next_block": {
"base_fee_direction": "falling",
"change_pct": -0.0592,
"label": "balanced",
"next_base_fee_estimate": {
"gwei": 0.002099
}
},
"observedAt": "2026-10-29T12:00:00.000Z",
"priority": {
"basis": "node eth_maxPriorityFeePerGas",
"gwei": 0.001
}
},
"plan": {
"cost": {
"expected": {
"eth": 2.015e-7,
"usd": 0.000519971
},
"gas": 65000,
"max_authorized": {
"eth": 3.38e-7,
"usd": 0.000872209
},
"total_expected": {
"eth": 2.02305e-7,
"usd": 0.000522048
}
},
"inclusion": {
"blocks": [
1,
2
],
"seconds": [
2,
4
]
},
"maxFeePerGas": {
"gwei": 0.0052
},
"maxPriorityFeePerGas": {
"gwei": 0.001
},
"tier": "standard",
"urgency": "normal"
},
"ready_to_sign": {
"chainId": "0x2105",
"gas": "0xfde8",
"maxFeePerGas": "0x4f5880",
"maxPriorityFeePerGas": "0xf4240",
"tier": "standard",
"type": "0x2"
},
"sources": [
"publicnode base rpc (via stream hub)",
"chainlink ETH/USD (Base feed)",
"Base GasPriceOracle (predeploy 0x42..0F)"
]
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"properties": {
"calldata_bytes": {
"description": "optional size of your unsigned transaction in bytes: prices the Base L1 data fee (charged on top of gas) from the GasPriceOracle and adds it to total_expected",
"maximum": 131072,
"minimum": 0,
"type": "integer"
},
"gas_limit": {
"description": "gas units of YOUR transaction (default 21000 = ETH transfer; ~65000 ERC-20 transfer, ~46000 approve, ~180000 swap)",
"maximum": 30000000,
"minimum": 21000,
"type": "integer"
},
"max_usd": {
"description": "optional USD gas budget for this transaction: the plan downgrades to the best tier that fits, or says wait when even the slow tier is above it",
"maximum": 100000,
"minimum": 0.000001,
"type": "number"
},
"urgency": {
"description": "low = may wait a few blocks (slow tier), normal = next block or two (default, standard), high = busy blocks (fast), next_block = must land in the very next block (urgent)",
"enum": [
"low",
"normal",
"high",
"next_block"
],
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"alternatives": {
"type": "array"
},
"chain": {
"type": "string"
},
"chainId": {
"type": "integer"
},
"decision": {
"type": "object"
},
"eth_usd": {
"type": "object"
},
"headline": {
"type": "string"
},
"how_to_use": {
"type": "array"
},
"inputs": {
"type": "object"
},
"kit": {
"type": "string"
},
"l1_data_fee": {
"type": "object"
},
"market": {
"type": "object"
},
"plan": {
"type": "object"
},
"ready_to_sign": {
"type": "object"
},
"sources": {
"type": "array"
}
},
"required": [
"kit",
"chain",
"chainId",
"headline",
"decision",
"plan",
"ready_to_sign",
"market",
"eth_usd"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
},
"builder-code": {
"info": {
"a": "bc_d5i1omim"
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"a": {
"description": "App builder code",
"pattern": "^[a-z0-9_]{1,32}$",
"type": "string"
},
"s": {
"description": "Service builder codes",
"items": {
"pattern": "^[a-z0-9_]{1,32}$",
"type": "string"
},
"maxItems": 11,
"type": "array"
},
"w": {
"description": "Wallet builder code",
"pattern": "^[a-z0-9_]{1,32}$",
"type": "string"
}
},
"type": "object"
}
}
},
"lastUpdated": "2026-11-02T17:28:35.718Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-11-02T17:28:35.595Z"
},
"resource": "https://agents.avasis.ai/v1/base/fee-plan",
"serviceName": "Avasis Agent Platform",
"tags": [
"base",
"gas",
"fees",
"evm",
"eip-1559"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Base gas fee plan for ONE transaction ($0.02): give gas_limit (+ urgency low/normal/high/next_block, optional max_usd budget, calldata_bytes for the L1 fee) and get the EIP-1559 fields to sign (maxFeePerGas, maxPriorityFeePerGas, hex ready_to_sign), expected + max cost in ETH + USD, blocks to inclusion, the other tiers, and a send_now / downgrade / wait decision with its reason from the latest block's fill. Free live sample /v1/evm/fee-plan/sample. Upstream down 503, never charged."
}What the leaf hashes
{"body":"c52ce4ce89426c718c71538246e25bd9f9518ca5910273be70197222ae250ac7","id":2199941,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646794341326,"prev":null,"subject":"x402_bazaar:https://agents.avasis.ai/v1/base/fee-plan","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (444186 rows).
- 0x86e636d17d3e547ffbf5c9d3e6764e52efd6a4eb33fe8eb130f06d7f47342421
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- 0xa3ddddd7fb6d5fcd8e86f02dad4f1171c251ec584cd8e3ca2fa59e9e591d6677
- 0x8941853377c9e1c5c248761e0a22af1f8cd9c534258e43a26b452aebad0b2038
- 0x459a820f07080c181130d1dd317851777b732f1624df94f4b0d1d3e1f18d30a4
- 0x650762fd3ea664db9c82e9fa57a70645b039ff3d3dda93972e6da6c3b1355d26
- 0x45296e5ab7be6d8163e528d05039d4c685fc8962fc80b797c1d68574b10b444c
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- 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af