← The evidence ledger
Evidence row 71117
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://apiacre.com/v1/research/feed-normalize
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 21fe6c252508a1f84643c89ade4756a96ed2e9108f13a982dcef62f723e9c40b
- Leaf
- 0x1da8f4f902120ee819e8dda7f4a751eea9522b85ede53ac5cc4dd4ccbdbb4aad
What was observed
{
"endpoints": [
[
"x402",
"https://apiacre.com/v1/research/feed-normalize"
]
],
"name": "API Acre",
"owner_address": "0xa0bfa4f07281c9b248dc3aed2217836bca24869b",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xa0BFa4f07281c9b248DC3AED2217836BcA24869B",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "B4CHWQeQn7GDLZD2aW6hpGG2bEseisBFLZYECA3HDLan",
"scheme": "exact"
}
],
"description": "Fetch and normalize public RSS or Atom feeds into stable structured JSON entries for agents and research workflows.",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://hnrss.org/frontpage"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"data": {
"entries": [
{
"id": "https://example.com/posts/engineering-launch",
"published": "Tue, 11 Aug 2026 04:00:00 +0000",
"publishedAt": "2026-08-11T04:00:00+00:00",
"summary": "A bounded example entry normalized from a public RSS item.",
"title": "Example engineering launch",
"url": "https://example.com/posts/engineering-launch"
},
{
"id": "https://example.com/posts/api-update",
"published": "Tue, 11 Aug 2026 03:00:00 +0000",
"publishedAt": "2026-08-11T03:00:00+00:00",
"summary": "A second demonstration item with the same stable output fields.",
"title": "Example API update",
"url": "https://example.com/posts/api-update"
}
],
"entryCount": 2,
"title": "Hacker News: Front Page",
"url": "https://hnrss.org/frontpage"
},
"meta": {
"cached": false,
"duration_ms": 42,
"next_actions": [],
"sources": [],
"warnings": []
},
"request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a",
"service": "research.feed-normalize",
"version": "1"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"limit": {
"default": 20,
"maximum": 100,
"minimum": 1,
"title": "Limit",
"type": "integer"
},
"url": {
"format": "uri",
"maxLength": 2083,
"minLength": 1,
"title": "Url",
"type": "string"
}
},
"required": [
"url"
],
"title": "FeedInput",
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"description": "Structured Feed normalization result",
"properties": {
"entries": {
"items": {},
"type": "array"
},
"entryCount": {
"type": "integer"
},
"title": {
"type": [
"string",
"null"
]
},
"url": {
"type": "string"
}
},
"type": "object"
},
"meta": {
"properties": {
"cached": {
"type": "boolean"
},
"duration_ms": {
"minimum": 0,
"type": "integer"
},
"next_actions": {
"description": "Optional separately priced follow-up calls. Each action requires a new payment challenge and explicit buyer authorization.",
"items": {
"properties": {
"authorization_required": {
"const": true,
"type": "boolean"
},
"checkout_path": {
"pattern": "^/try/",
"type": "string"
},
"executes_automatically": {
"const": false,
"type": "boolean"
},
"handoff_path": {
"description": "Free full contract and spend-capped command handoff; reading it does not execute or purchase the follow-up.",
"pattern": "^/catalog/",
"type": "string"
},
"handoff_payment_required": {
"const": false,
"type": "boolean"
},
"input_template": {
"description": "Client-side template only: $request refers to the original input, $result to this response, and $json(...) serializes its argument. The server does not execute the follow-up.",
"type": "object"
},
"maximum_atomic_usdc": {
"pattern": "^[1-9][0-9]*$",
"type": "string"
},
"method": {
"const": "POST",
"type": "string"
},
"path": {
"pattern": "^/v1/",
"type": "string"
},
"price": {
"pattern": "^\\$[0-9]+",
"type": "string"
},
"reason": {
"type": "string"
},
"sample_path": {
"pattern": "^/samples/",
"type": [
"string",
"null"
]
},
"service": {
"type": "string"
},
"title": {
"type": "string"
},
"use_output": {
"type": "string"
}
},
"required": [
"service",
"title",
"reason",
"method",
"path",
"price",
"input_template",
"use_output",
"handoff_path",
"checkout_path",
"sample_path",
"maximum_atomic_usdc",
"handoff_payment_required",
"executes_automatically",
"authorization_required"
],
"type": "object"
},
"type": "array"
},
"sources": {
"items": {
"type": "string"
},
"type": "array"
},
"warnings": {
"items": {
"type": "string"
},
"type": "array"
}
},
"required": [
"duration_ms",
"cached",
"sources",
"warnings",
"next_actions"
],
"type": "object"
},
"request_id": {
"description": "Unique request identifier",
"type": "string"
},
"service": {
"const": "research.feed-normalize",
"type": "string"
},
"version": {
"const": "1",
"type": "string"
}
},
"required": [
"request_id",
"service",
"version",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"id": {
"maxLength": 128,
"minLength": 16,
"pattern": "^[a-zA-Z0-9_-]+$",
"type": "string"
},
"required": {
"type": "boolean"
}
},
"required": [
"required"
],
"type": "object"
}
}
},
"iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1786471603/bazaar-icons/3cd5dfbdc8c7913d.png",
"lastUpdated": "2026-10-19T11:10:55.486Z",
"quality": {
"l30DaysTotalCalls": 3,
"l30DaysUniquePayers": 3,
"lastCalledAt": "2026-10-19T11:10:54.921Z"
},
"resource": "https://apiacre.com/v1/research/feed-normalize",
"serviceName": "API Acre",
"tags": [
"developer",
"research",
"rss",
"atom",
"feed"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Fetch and normalize public RSS or Atom feeds into stable structured JSON entries for agents and research workflows."
}What the leaf hashes
{"body":"21fe6c252508a1f84643c89ade4756a96ed2e9108f13a982dcef62f723e9c40b","id":71117,"kind":"listing","method":"baseline/1","observed_us":1793025481638713,"prev":null,"subject":"x402_bazaar:https://apiacre.com/v1/research/feed-normalize","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).
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- 0x667c9edc7131bd388a1c1a039f7fddf0a4fbc13b4f1e7297601127a46cdc7292
- 0xf0f77ed1d484625ddaf2f6e58baa64c9dec47a22b1a6beb91219a17bddac7dfa
- 0x8e3531af6dd328ff9a174dd19751228f67fa0773c68a89edf859dffbd7b098c3
- 0x42b0d9d5b53af5b0fe99cee10ce29fe484db78b92ce49f97190cc6d098651d47
- 0x9dfd312f3d4937f7cb144cee3987e8516f222932b4ea286605236d73cfa1ed16
- 0xc3a6a3ae44ec0da1848b16d40c45d7aac97a67352eea8df18e0f26edabea8a2f
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- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae