← The evidence ledger
Evidence row 4088
Observed , by baseline/1.
- Kind
- listing
- About
- source_record agentic_market:utils-kagurazaka-dev
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- c07d4023f7a4312850fd3a7aa6ee469172cfea2c96d2dced903f0970e3ce2668
- Leaf
- 0xb819865a1ad58c335e816dc729f03c8e4fc3820b9500f9a034650f022861e070
What was observed
{
"endpoints": [
[
"x402",
"https://utils.kagurazaka.dev/v1/convert"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/cron"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/date"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/diff"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/encode"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/hash"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/holidays"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/id"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/json-schema"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/jwt"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/math"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/phone"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/regex"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/time"
],
[
"x402",
"https://utils.kagurazaka.dev/v1/tokens"
]
],
"name": "utils.kagurazaka.dev",
"owner_address": null,
"raw": {
"caip2_networks": [
"eip155:8453"
],
"category": "",
"description": "",
"domain": "utils.kagurazaka.dev",
"endpoints": [
{
"description": "Convert a value between units of length, mass, volume, temperature, speed, area, energy, power, pressure, data size, time and more (mathjs units), such as mi to km, degF to degC, GB to MiB, kWh to J.",
"method": "GET",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "mi",
"group": "query",
"name": "from",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "km",
"group": "query",
"name": "to",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": 26.2,
"group": "query",
"name": "value",
"required": false,
"type": "number"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"units",
"conversion",
"math"
],
"url": "https://utils.kagurazaka.dev/v1/convert"
},
{
"description": "Explain a cron expression in plain English and list its next run times in a time zone (5 or 6 fields, with ranges, steps, L, W and #).",
"method": "GET",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": 3,
"group": "query",
"name": "count",
"required": false,
"type": "number"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "0 9 * * 1-5",
"group": "query",
"name": "expr",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "Asia/Tokyo",
"group": "query",
"name": "tz",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"cron",
"schedule",
"time"
],
"url": "https://utils.kagurazaka.dev/v1/cron"
},
{
"description": "Add or subtract an ISO 8601 duration (P1M, P2W, PT36H) to a date, months clamped to the month's end; or count the days, weeks, calendar months, years, seconds and business days (Monday to Friday, less a country's public holidays) between two dates. Also the weekday, ISO week and day of year.",
"method": "GET",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "JP",
"group": "query",
"name": "country",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "2026-12-25",
"group": "query",
"name": "end",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "2026-10-25",
"group": "query",
"name": "start",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"date",
"calendar",
"business-days",
"duration"
],
"url": "https://utils.kagurazaka.dev/v1/date"
},
{
"description": "Compare two texts by lines, words or characters: what was added and removed, and a unified diff for lines.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "one\ntwo\nthree\n",
"group": "body",
"name": "a",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "one\n2\nthree\nfour\n",
"group": "body",
"name": "b",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"diff",
"text",
"compare"
],
"url": "https://utils.kagurazaka.dev/v1/diff"
},
{
"description": "Encode or decode text: base64, base64url, hex, URL (percent) encoding and HTML escaping.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "base64-encode",
"group": "body",
"name": "op",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "hello world",
"group": "body",
"name": "text",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"base64",
"encoding",
"url",
"hex"
],
"url": "https://utils.kagurazaka.dev/v1/encode"
},
{
"description": "MD5, SHA-1, SHA-256, SHA-512, SHA3-256 and Keccak-256 (Ethereum) of a text, or of bytes given as hex or base64, as hex and base64.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": [],
"group": "body",
"name": "algorithms",
"required": false,
"type": "array"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "hello",
"group": "body",
"name": "text",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"hash",
"sha256",
"keccak256",
"crypto"
],
"url": "https://utils.kagurazaka.dev/v1/hash"
},
{
"description": "Holidays of a country (and optionally a state or region) in a year, with date, name and type (public, bank, school, optional, observance), from the date-holidays data for about 200 countries.",
"method": "GET",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "JP",
"group": "query",
"name": "country",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "en",
"group": "query",
"name": "lang",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": 2026,
"group": "query",
"name": "year",
"required": false,
"type": "number"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"holidays",
"calendar",
"date",
"country"
],
"url": "https://utils.kagurazaka.dev/v1/holidays"
},
{
"description": "Generate random IDs from a cryptographic source: UUID v4, UUID v7 (time ordered), ULID or nanoid, up to 100 at a time.",
"method": "GET",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": 2,
"group": "query",
"name": "count",
"required": false,
"type": "number"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "uuid7",
"group": "query",
"name": "type",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"uuid",
"ulid",
"id",
"random"
],
"url": "https://utils.kagurazaka.dev/v1/id"
},
{
"description": "Validate a JSON value against a JSON Schema (draft-07 and 2019-09 keywords, formats such as email, uri, date-time) and list every error with its path. Patterns run on RE2, so a schema cannot stall the check.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": null,
"group": "body",
"name": "data",
"required": false,
"type": "object"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": null,
"group": "body",
"name": "schema",
"required": false,
"type": "object"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"json",
"json-schema",
"validation"
],
"url": "https://utils.kagurazaka.dev/v1/json-schema"
},
{
"description": "Decode a JSON Web Token's header and claims, and say when it was issued, when it expires, whether it has expired and in how many seconds it will. The signature is not verified.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMiLCJleHAiOjE3OTI4ODY0MDB9.sig",
"group": "body",
"name": "token",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"jwt",
"auth",
"decode"
],
"url": "https://utils.kagurazaka.dev/v1/jwt"
},
{
"description": "Evaluate an arithmetic expression with 64 significant digits (no floating point surprises): operators, parentheses, powers, roots, logs, trigonometry, percentages, constants, units (5 inch to cm) and simple statistics.",
"method": "GET",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "0.1 + 0.2",
"group": "query",
"name": "expr",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"math",
"calculator",
"arithmetic"
],
"url": "https://utils.kagurazaka.dev/v1/math"
},
{
"description": "Check whether a phone number is valid and possible, find its country and type (mobile, fixed line, toll free and others), and format it as E.164, international and national (libphonenumber metadata).",
"method": "GET",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "+1 650 253 0000",
"group": "query",
"name": "number",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"phone",
"validation",
"formatting"
],
"url": "https://utils.kagurazaka.dev/v1/phone"
},
{
"description": "Run a regular expression on a text: every match with its position and capture groups (named too), and the text with a replacement applied. RE2 syntax, which runs in linear time (no lookaround or backreferences).",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "(?P<year>\\d{4})-(\\d{2})",
"group": "body",
"name": "pattern",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "$2/$1",
"group": "body",
"name": "replacement",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "from 2026-10 to 2027-01",
"group": "body",
"name": "text",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"regex",
"text",
"developer-tools"
],
"url": "https://utils.kagurazaka.dev/v1/regex"
},
{
"description": "The current time, or a given time, in one or more IANA time zones, with UTC offset, abbreviation, whether daylight saving time is in effect, and the weekday. Give a local time with from_tz to convert it, handling DST correctly.",
"method": "GET",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "2026-10-25 09:00",
"group": "query",
"name": "at",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "Asia/Tokyo",
"group": "query",
"name": "from_tz",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "America/New_York,Europe/London",
"group": "query",
"name": "tz",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "4",
"l30DaysUniquePayers": "3"
},
"serviceName": "x402 Utils",
"tags": [
"time",
"timezone",
"date",
"dst"
],
"url": "https://utils.kagurazaka.dev/v1/time"
},
{
"description": "Count the tokens of a text for OpenAI models (o200k_base for GPT-4o and later, cl100k_base for GPT-4), with characters, words and lines, to size prompts and estimate cost.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "Agents pay for APIs with x402.",
"group": "body",
"name": "text",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.001",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "x402 Utils",
"tags": [
"tokens",
"llm",
"tokenizer",
"openai"
],
"url": "https://utils.kagurazaka.dev/v1/tokens"
}
],
"enriched": false,
"iconUrl": "",
"id": "utils-kagurazaka-dev",
"integrationType": "",
"isNew": false,
"name": "utils.kagurazaka.dev",
"networks": [
"Base"
],
"priceSummary": {
"avgCostBasis": "exact",
"avgCostPerTransaction": "0.001",
"currency": "USDC",
"maxAmount": "0.001",
"minAmount": "0.001"
},
"provider": "utils.kagurazaka.dev",
"providerUrl": "",
"serviceName": "x402 Utils",
"tags": [
"units",
"conversion",
"math",
"cron",
"schedule",
"time",
"date",
"calendar",
"business-days",
"duration",
"diff",
"text",
"compare",
"base64",
"encoding",
"url",
"hex",
"hash",
"sha256",
"keccak256",
"crypto",
"holidays",
"country",
"uuid",
"ulid",
"id",
"random",
"json",
"json-schema",
"validation",
"jwt",
"auth",
"decode",
"calculator",
"arithmetic",
"phone",
"formatting",
"regex",
"developer-tools",
"timezone",
"dst",
"tokens",
"llm",
"tokenizer",
"openai"
]
},
"source": "agentic_market",
"summary": ""
}What the leaf hashes
{"body":"c07d4023f7a4312850fd3a7aa6ee469172cfea2c96d2dced903f0970e3ce2668","id":4088,"kind":"listing","method":"baseline/1","observed_us":1793025277131783,"prev":null,"subject":"agentic_market:utils-kagurazaka-dev","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).
- 0xb819a22a9d784f10084cfab58c18e778e25ae1334e1443acf4f3bf1e74940db6
- 0xd47d0b73a9566f69832d45887939cb7af3b2f1a42f58a23b26452828bb8f0e78
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- 0x376ead5efef3453b8106c4b33c144524e3c746be658f6a7de08ceda71f2e49e5
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- 0x6a04b2fef409d353ffb0a1de35b0a2dceb4715d69fa168a8836cab76f936c57d
- 0xdb352faebb56a09d4608bb832db9b5e3811beecb9baee5e5a7acc481983199ce
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- 0xa4be442ac364076ac81def5d874f026f701ed9c8fce453af09052efe34f0c7ee
- 0x930671b38b693880d085315beda88a1c227f3639e9a0e0be6b0665bb173a65db
- 0xb6efd79902cac6d5a402ebecb8069402f00961ab80cd71b4d647fbc686d975ec
- 0x2f43fe2b2533a5f40c107c114e458e226102f5f8ae91f097e964345880e30928
- 0xf692ce2b0a640ec9f75aa960e5fb1c2c7091a04e24881798735752c19014e519
- 0x9f68b5e15459cb62b8c0cd4c124fa61c74147b4a5755a200fbecd21a581635d1
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- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae