← The evidence ledger
Evidence row 2202007
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://data-calc.x402tookit.com/latency-budget
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 2068599f4e56411318ad5078b9ef10f44195213c129b13bf1dd87f7c297929c2
- Leaf
- 0xa50f89a985f7d3549f0469e5e8254c770e03ed1ea86587de633d8e810d6249dd
What was observed
{
"endpoints": [
[
"x402",
"https://data-calc.x402tookit.com/latency-budget"
]
],
"name": "Systems Capacity Calculators",
"owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
"raw": {
"accepts": [
{
"amount": "20000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"transactionVersions": [
0
]
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
}
],
"description": "Add up serial stage latencies against a target (share per stage, slack, bottleneck) and compute tail amplification from fan-out.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"fanOut": 100,
"stages": "dns:20,tls:40,app:120,db:60",
"targetMs": 300
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T20:19:39.450Z",
"bottleneck": "app",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"fanOut": {
"calls": 100,
"note": "to have 99% of requests entirely within the per-call latency, each call must meet its target 99.9900% of the time",
"perCallPercentile": 99,
"perCallPercentileNeededForSameOverall": 99.98995016917584,
"probabilityAtLeastOneCallSlowerThanItsPercentile": 0.6339676587267709,
"requestsHitByTailPercent": 63.3968
},
"notChecked": [
"the distribution of each stage: adding percentiles of stages (p99 + p99) overstates the p99 of the sum, but adding means is exact",
"queueing delay under load (see /queue-model) and retries",
"…1 more"
],
"reasons": [
"Serial stages add; the share column shows where to optimise first.",
"Tail amplification: with N parallel calls the chance that at least one is slower than its p99 is 1 - 0.99^N (63% for N = 100), so the request is as slow as its slowest call."
],
"serialTotalMs": 240,
"slackMs": 60,
"source": "computed locally",
"stages": [
{
"ms": 20,
"sharePercent": 8.33,
"stage": "dns"
},
{
"ms": 40,
"sharePercent": 16.67,
"stage": "tls"
}
],
"summary": "Serial total 240 ms; biggest stage app (50%). Within the 300 ms target with 60 ms to spare. Fan-out 100 calls at p99: 63.4% of requests see at least one slow call.",
"targetMs": 300,
"targetUsedPercent": 80,
"verdict": "WITHIN_TARGET"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"fanOut": {
"description": "Parallel calls a request waits for (each at its own percentile), 1 to 100000",
"type": "integer"
},
"percentile": {
"description": "Per-call percentile, 50 to 99.9999 (default 99): the chance a single call is within its stated latency",
"type": "number"
},
"stages": {
"description": "name:milliseconds pairs, comma separated: dns:20,tls:40,app:120,db:60",
"type": "string"
},
"targetMs": {
"description": "Total latency target in milliseconds, to compute slack",
"type": "number"
}
},
"required": [
"stages"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"bottleneck": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"fanOut": {
"properties": {
"calls": {
"type": [
"null",
"number"
]
},
"note": {
"type": [
"null",
"string"
]
},
"perCallPercentile": {
"type": [
"null",
"number"
]
},
"perCallPercentileNeededForSameOverall": {
"type": [
"null",
"number"
]
},
"probabilityAtLeastOneCallSlowerThanItsPercentile": {
"type": [
"null",
"number"
]
},
"requestsHitByTailPercent": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"serialTotalMs": {
"type": [
"null",
"number"
]
},
"slackMs": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"stages": {
"items": {
"properties": {
"ms": {
"type": [
"null",
"number"
]
},
"sharePercent": {
"type": [
"null",
"number"
]
},
"stage": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"targetMs": {
"type": [
"null",
"number"
]
},
"targetUsedPercent": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:47:12.968Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:47:12.698Z"
},
"resource": "https://data-calc.x402tookit.com/latency-budget",
"serviceName": "Systems Capacity Calculators",
"tags": [
"latency",
"slo",
"tail-latency",
"budget"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Add up serial stage latencies against a target (share per stage, slack, bottleneck) and compute tail amplification from fan-out."
}What the leaf hashes
{"body":"2068599f4e56411318ad5078b9ef10f44195213c129b13bf1dd87f7c297929c2","id":2202007,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646811320848,"prev":null,"subject":"x402_bazaar:https://data-calc.x402tookit.com/latency-budget","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).
- 0xa50f36ae545ce8fdb888fff31ad396c48ebb17735b471b96e3097c6b03e02d7b
- 0xcd02a3bb1f75543937dfd37ad12151b3268c697c0f863cda0fcde27db84aac7c
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- 0x13b7a60fd304b5422840276566ee7e3a547eb2d470555f1a4cabb7731313b967
- 0xac910d9b52e7ee6d5e325aa2e6a8ebb65b9bc437e96334fa9fd214d79d7d9f29
- 0x670f374d9fbf21f194317217dd57d232d578491520d7f8ebe83e592a6be6358a
- 0xe3f02b427f59850600c9d974c72867477628ed537cbd789cbc04fd77632ff008
- 0x4c4f4cb682e94e3751eaa1fa136fc04582c4d9d8eb377f4fef8bb9a5f3e31983
- 0xec9b01ce49e2dd688fa78781733c888976342aaf0672176098d6561858941ddd
- 0x7a6e52c5cebe3ec69d18cc200885d32108ba1be1b19f2da2ead8becbf3db3cb1
- 0x7abf7290721a0b95be706db03c09de9df65bcba8e18ffe4616da43d9c31d6b0a
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- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af