← The evidence ledger
Evidence row 2202263
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://audio-calc.x402tookit.com/buffer-latency
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 5a90dcb8f807c72f6c8067c01ad379eb2d09155a38069482b1c416968c72d2d4
- Leaf
- 0xccc118e4e8f0d713a65731a69611c7dee13f8ec940379f61f11db855c75447e3
What was observed
{
"endpoints": [
[
"x402",
"https://audio-calc.x402tookit.com/buffer-latency"
]
],
"name": "Audio Calc",
"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": "Audio buffer size to latency in ms (one way and round trip) at a sample rate, or the buffer needed for a latency target.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"bufferSamples": 256,
"sampleRate": 48000
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T14:38:33.842Z",
"bufferForTarget": null,
"bufferSamples": 256,
"buffers": 2,
"commonSizes": [
{
"bufferSamples": 16,
"oneBufferMs": 0.333,
"roundTripMs": 0.667
},
{
"bufferSamples": 32,
"oneBufferMs": 0.667,
"roundTripMs": 1.333
}
],
"converterMs": 0,
"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.",
"notChecked": [
"plug-in and driver latency beyond the figure you supply as converterMs",
"operating-system mixing and USB or network transport latency",
"…2 more"
],
"oneBufferMs": 5.333333,
"reasons": [
"Round trip = buffers x buffer time + converter latency.",
"Between 10 and 25 ms: playable, but noticeable on percussive parts."
],
"roundTripMs": 10.666667,
"sampleRate": 48000,
"samplesPerMs": 48,
"source": "latency = buffer samples / sample rate, computed locally",
"summary": "256 samples at 48000 Hz = 5.333 ms per buffer, 10.667 ms round trip with 2 buffers.",
"targetMs": null,
"verdict": "MODERATE"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"bufferSamples": {
"description": "Buffer size in samples (use this, or targetMs)",
"type": "number"
},
"buffers": {
"description": "Number of buffers in the path (default 2, as on input plus output)",
"type": "number"
},
"converterMs": {
"description": "Fixed converter and driver latency to add in ms (default 0)",
"type": "number"
},
"sampleRate": {
"description": "Sample rate in Hz",
"type": "number"
},
"targetMs": {
"description": "Latency target in ms to find a buffer for",
"type": "number"
}
},
"required": [
"sampleRate"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"bufferForTarget": {},
"bufferSamples": {
"type": [
"null",
"number"
]
},
"buffers": {
"type": [
"null",
"number"
]
},
"commonSizes": {
"items": {
"properties": {
"bufferSamples": {
"type": [
"null",
"number"
]
},
"oneBufferMs": {
"type": [
"null",
"number"
]
},
"roundTripMs": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"converterMs": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"oneBufferMs": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"roundTripMs": {
"type": [
"null",
"number"
]
},
"sampleRate": {
"type": [
"null",
"number"
]
},
"samplesPerMs": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"targetMs": {},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:36:31.581Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:36:31.359Z"
},
"resource": "https://audio-calc.x402tookit.com/buffer-latency",
"serviceName": "Audio Calc",
"tags": [
"audio",
"latency",
"buffer-size",
"daw"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Audio buffer size to latency in ms (one way and round trip) at a sample rate, or the buffer needed for a latency target."
}What the leaf hashes
{"body":"5a90dcb8f807c72f6c8067c01ad379eb2d09155a38069482b1c416968c72d2d4","id":2202263,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646814780123,"prev":null,"subject":"x402_bazaar:https://audio-calc.x402tookit.com/buffer-latency","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).
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- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af