← The evidence ledger
Evidence row 18497
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://api.firstmention.uk/s/x402-preflight/check
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 469254a4a3e9668e09044c2a608e52cd25507b4217193e19e31eb1e93486f024
- Leaf
- 0xa1e8123bf508b6393aae5a9fc5dd667c667826bd135b508a941e999065d607d5
What was observed
{
"endpoints": [
[
"x402",
"https://api.firstmention.uk/s/x402-preflight/check"
]
],
"name": "x402-preflight",
"owner_address": "0xddbee715feb5232af1f2b0f07392aaa0c712e572",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xddbeE715fEB5232aF1f2B0f07392aAA0c712E572",
"scheme": "exact"
}
],
"description": "Check any x402 endpoint before you pay it: /check reads its 402 challenge and validates scheme, network, asset, payTo, price and latency. /uptime returns accumulated reliability history; every checked URL is auto-monitored so history compounds. Free board at /monitored.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"url": "https://api.exa.ai/search"
},
"type": "http"
},
"output": {
"example": {
"history": {
"answered_402_pct": 100,
"avg_response_ms": 132,
"observations": 24
},
"http": {
"response_ms": 210,
"status": 402
},
"now_monitored": true,
"url": "https://crypto.apitoll.cloud/v1/crypto/price",
"verdict": "payable"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"properties": {
"url": {
"description": "Public HTTPS URL of the x402 endpoint to check",
"format": "uri",
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"history": {
"properties": {
"answered_402_pct": {
"type": "number"
},
"avg_response_ms": {
"type": "number"
},
"observations": {
"type": "number"
}
},
"type": "object"
},
"http": {
"properties": {
"response_ms": {
"type": "number"
},
"status": {
"type": "number"
}
},
"type": "object"
},
"now_monitored": {
"type": "boolean"
},
"url": {
"type": "string"
},
"verdict": {
"type": "string"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-10-26T05:50:24.766Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-10-26T05:50:24.598Z"
},
"resource": "https://api.firstmention.uk/s/x402-preflight/check",
"serviceName": "x402-preflight",
"tags": [
"x402",
"uptime",
"reliability",
"payments",
"monitoring"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Check any x402 endpoint before you pay it: /check reads its 402 challenge and validates scheme, network, asset, payTo, price and latency. /uptime returns accumulated reliability history; every checked URL is auto-monitored so history compounds. Free board at /monitored."
}What the leaf hashes
{"body":"469254a4a3e9668e09044c2a608e52cd25507b4217193e19e31eb1e93486f024","id":18497,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025329242131,"prev":null,"subject":"x402_bazaar:https://api.firstmention.uk/s/x402-preflight/check","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).
- 0xa1e760141c45681b48b9c928c841ce2dda13e64fb17736fb2b3cd054a2aa4d25
- 0x2443273e8893f8c30cea8a9b6402dc74c9d95b8a204dfe03d2315db6c406e98a
- 0xd456b6dca8222d1f68cc142784d33c85c03279e76e9c0af5954497f1e310417d
- 0xfe0fcfb57485d3b0e467446a9188b05f44a0503d6e9d324e78ad27bcf994142a
- 0x14d96ae960f67a47f7486a4872d9f1fe6b3c2ecd4ef2b20cfce834009db88af2
- 0x93ab282ad684bc2e46e3680d2c1131f77536e16f9323ab22c7ffce7fbbe11384
- 0x1e7a14ea6b358c05fa8db923fc0229d89744a53f2d57f223341b98e7ab6983ac
- 0x2e144154c07b8627c463da902b4cedbc49a449da7270993f17da8fd56642ade2
- 0x33c43c2dd42247d4d2b030b625088f223c6c20020a9de52dfb3252e2a60a0a2a
- 0xb3f8079d3f950c3f93c2829ed52d6d83dba720fdb1aef8897303edba370e9d0f
- 0x9ca444fcd24e94bee95de2e8d69f385e59ecdaff6c1b017632bff037809c381b
- 0x95576cc3dd18642c859f679cefa1cf80bfc6c690b065916c3585b14e8ef4b1b3
- 0xf8d3e004d9a208d2c5e82ab676956d80f8a3c78387c61dad15a3a8269efee0d8
- 0x6713795704ddd9c528d421fadd9cc96b0200a4ddbba84f88e718d4968dde888b
- 0x62a900133713919f4eed33d8336876b7a6d538233b8a4f3ed03b29aa44f5bad0
- 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
- 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
- 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae