← The evidence ledger
Evidence row 76147
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://handel.halowerk.com/v1/price-change-callback
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 5930bbae272f056613b4608213e3ababd1db51a63e0a6ee25a2312e131075bfa
- Leaf
- 0xa6412a5aa01e8d77b39d7db32edcfe9804b3d92800ec13b1e7a00b35d70af177
What was observed
{
"endpoints": [
[
"x402",
"https://handel.halowerk.com/v1/price-change-callback"
]
],
"name": "handel.halowerk.com/v1/price-change-callback",
"owner_address": "0x2880edfff13100677bf97a3cbdf3bc34771c4e5e",
"raw": {
"accepts": [
{
"amount": "6000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"asset": "USDC",
"assetTransferMethod": "eip3009",
"eip712Domain": {
"chainId": 8453,
"name": "USD Coin",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"version": "2"
},
"name": "USD Coin",
"network_name": "Base Mainnet",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"scheme": "exact"
}
],
"description": "One synchronous observation, not a recurring subscription. The caller schedules later checks and supplies its previous numeric offer price. Reuses Fetchwerk product extraction from actual HTML and returns raw price evidence. No conversion, no inferred price, no shipping-total guarantee and no JavaScript-only shop support. Source and callback require public IPv4 HTTPS on port443; every connection is DNS-checked and pinned, redirects rechecked (callbacks never redirect).",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"callback_url": "https://stack.halowerk.com/_top10-endspurt/callback",
"direction": "increase",
"idempotency_key": "replace_with_32_character_random_event_key",
"minimum_change": 0.5,
"previous": {
"currency": "GBP",
"value": 50.77
},
"url": "https://books.toscrape.com/catalogue/a-light-in-the-attic_1000/index.html"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"callback_url": {
"maxLength": 2000,
"type": "string"
},
"direction": {
"default": "any",
"enum": [
"any",
"decrease",
"increase"
],
"type": "string"
},
"idempotency_key": {
"maxLength": 128,
"minLength": 32,
"pattern": "^[A-Za-z0-9_-]+$",
"type": "string"
},
"minimum_change": {
"default": 0,
"maximum": 1000000000,
"minimum": 0,
"type": "number"
},
"previous": {
"additionalProperties": false,
"properties": {
"currency": {
"pattern": "^[A-Z]{3}$",
"type": "string"
},
"value": {
"maximum": 1000000000,
"minimum": 0,
"type": "number"
}
},
"required": [
"value",
"currency"
],
"type": "object"
},
"url": {
"maxLength": 2000,
"type": "string"
}
},
"required": [
"url",
"previous",
"callback_url",
"idempotency_key"
],
"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"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-10-09T08:08:09.656Z",
"quality": {
"l30DaysTotalCalls": 3,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-10-09T08:08:09.212Z"
},
"resource": "https://handel.halowerk.com/v1/price-change-callback",
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "One synchronous observation, not a recurring subscription. The caller schedules later checks and supplies its previous numeric offer price. Reuses Fetchwerk product extraction from actual HTML and returns raw price evidence. No conversion, no inferred price, no shipping-total guarantee and no JavaScript-only shop support. Source and callback require public IPv4 HTTPS on port443; every connection is DNS-checked and pinned, redirects rechecked (callbacks never redirect)."
}What the leaf hashes
{"body":"5930bbae272f056613b4608213e3ababd1db51a63e0a6ee25a2312e131075bfa","id":76147,"kind":"listing","method":"baseline/1","observed_us":1793025491711417,"prev":null,"subject":"x402_bazaar:https://handel.halowerk.com/v1/price-change-callback","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).
- 0xa640ed88b973944eb9cc4b427bfa20154f09b6b8e73438588dc98cbb16647a51
- 0x2942dfd59821137c040dd9d4c912167f4504d1e7559d118ad659894d39811c6e
- 0xf66029f572d00eb21194730abb42d7054c8bd7003b5dd04564b0a1cd1f308c55
- 0x01fd6900e2105eb3d75cc0540ba1655f058b0329f69f6de5deb40b6d0fcd70b5
- 0x0dc5af1e0efe8970510329024f597ac245ce32842abbb50c0af526077cf2699a
- 0xbf7f18ec285a73f88fbc11c77cc25366a1be83c6cb434b4c144c8155d5b72d56
- 0xe5108a293dec228bbaa230916b91c0d418f828397ab4f375afb6f1e95babba82
- 0xe1ba96aba650821f3d9552eae51cc6c595d410d0b1248f7d91b319bd1396e862
- 0xb4c0b7187921a3fa9eef3519b98c8bca669a3aa7d7681abd99a70afcf0598efd
- 0x93c7b1ac8754236471980488e2ae86b7135fed175d7852bf9b8ef708900f060d
- 0xf9b4ada16aca6f9b63c09b94519008e1b94357a9d352c245023758b56b82d0b1
- 0x1e464fcb484a1e782f9fe44be5118a9de934eb533c96ba10fc7d20e3a3e4711c
- 0x292ebdce6b8d3d7ef08ad646a0fd97dee9313ab55c1a350807d9f3013794c37a
- 0x428106f4ae4ec142f17aebf6fa50935242f8d3f1c211cf95d6351d03d11da2b7
- 0x62a900133713919f4eed33d8336876b7a6d538233b8a4f3ed03b29aa44f5bad0
- 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
- 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
- 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae