← The evidence ledger
Evidence row 19378
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://paycheck.hectichustle.workers.dev/address/check
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 791feff79a71b23075e4bfce3a37d34d9c4140aab110bcfe4fe3381aabaed04d
- Leaf
- 0x7e50a187f5da7473a2cb9aef8fcbaf64c80e07a6d14188a680883d2082e7bf38
What was observed
{
"endpoints": [
[
"x402",
"https://paycheck.hectichustle.workers.dev/address/check"
]
],
"name": "Kertivo Shield",
"owner_address": "0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede",
"raw": {
"accepts": [
{
"amount": "1000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"scheme": "exact"
}
],
"description": "Address-poisoning check before you send USDC on Base. Body {from, to} (or sender/recipient; chain=base, token=USDC only, others 400 not charged; optional contacts/known_addresses): scans the sender's recent Base USDC transfers for lookalikes (same first/last 4 hex) plus dust/zero-value transfers. No sender? {recipient, known_addresses} = offline contacts check; {address} alone scans its own history for poisoning signs. Returns risk low/medium/high, lookalikes, reasons, coverage.",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"from": "0x9D42EbA8868CFd38A50Ba615ee0cf903F1BBeCE9",
"to": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"chain": "base",
"coverage": {
"complete": false,
"coveragePct": 38,
"lowCoverage": false,
"rpcCalls": 47,
"scannedFrom": 52468176,
"scannedTo": 52518176,
"transfersSeen": 19,
"windowBlocks": 50000
},
"from": "0x9d42eba8868cfd38a50ba615ee0cf903f1bbece9",
"lookalikes": [],
"reasons": [
"you have paid 'to' before and no lookalikes found"
],
"risk": "low",
"seenBefore": true,
"to": "0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede",
"token": "USDC"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"description": "Three shapes: {from, to, contacts?} scans the sender's recent Base USDC history; contacts-only {to, contacts} without from (aliases recipient/address + known_addresses/known) is offline lookalike vs contacts (no RPC); recipient-only {to} alone (alias address) scans that address's own recent USDC history for poisoning fingerprints.",
"properties": {
"chain": {
"description": "Optional. Base only (base, eip155:8453, 8453). Any other chain returns 400 unsupported_chain and is not charged — Shield only scans Base USDC.",
"type": [
"string",
"integer"
]
},
"contacts": {
"description": "Optional: up to 50 trusted addresses / address book (aliases: known_addresses, known). With from: offline lookalike of contacts too. Without from: contacts-only mode (no RPC).",
"items": {
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"maxItems": 50,
"type": "array"
},
"from": {
"description": "Sender address (aliases: sender, fromAddress). Omit for contacts-only or recipient-only mode.",
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"to": {
"description": "Intended recipient (aliases: recipient, toAddress, address). Required in every shape.",
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"token": {
"description": "Optional. USDC only (symbol USDC or Base USDC contract). Any other token (e.g. USDT) returns 400 unsupported_token and is not charged.",
"type": "string"
}
},
"required": [
"to"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"chain": {
"enum": [
"base"
],
"type": "string"
},
"contacts": {
"description": "Only present when contacts were sent",
"properties": {
"checked": {
"type": "integer"
},
"inContacts": {
"type": "boolean"
},
"lookalikes": {
"items": {
"properties": {
"contact": {
"type": "string"
},
"prefixMatch": {
"type": "integer"
},
"suffixMatch": {
"type": "integer"
}
},
"type": "object"
},
"type": "array"
}
},
"type": "object"
},
"coverage": {
"properties": {
"complete": {
"type": "boolean"
},
"coveragePct": {
"type": "number"
},
"lowCoverage": {
"description": "true when coveragePct < 10: almost nothing was scanned, so risk low does not mean safe (top reason explains; retry, pass contacts, or use /address/check/full)",
"type": "boolean"
},
"rpcCalls": {
"type": "integer"
},
"scannedFrom": {
"type": "integer"
},
"scannedTo": {
"type": "integer"
},
"transfersSeen": {
"type": "integer"
},
"windowBlocks": {
"type": "integer"
}
},
"type": "object"
},
"ignoredFields": {
"description": "Request fields Kertivo Shield did not use (they did not affect the answer); only present when there were any",
"items": {
"type": "string"
},
"type": "array"
},
"ignoredNote": {
"type": "string"
},
"lookalikes": {
"items": {
"properties": {
"address": {
"type": "string"
},
"dustTransfers": {
"type": "integer"
},
"inbound": {
"type": "integer"
},
"lastBlock": {
"type": "integer"
},
"outbound": {
"type": "integer"
},
"pattern": {
"enum": [
"dust_or_zero_value",
"lookalike_counterparty"
],
"type": "string"
},
"realOut": {
"type": "integer"
},
"sampleTx": {
"type": "string"
}
},
"type": "object"
},
"type": "array"
},
"reasons": {
"items": {
"type": "string"
},
"type": "array"
},
"risk": {
"enum": [
"low",
"medium",
"high"
],
"type": "string"
},
"seenBefore": {
"type": "boolean"
},
"token": {
"enum": [
"USDC"
],
"type": "string"
}
},
"required": [
"risk",
"lookalikes",
"seenBefore",
"coverage"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-10-26T02:33:51.285Z",
"quality": {
"l30DaysTotalCalls": 22,
"l30DaysUniquePayers": 4,
"lastCalledAt": "2026-10-26T02:33:50.833Z"
},
"resource": "https://paycheck.hectichustle.workers.dev/address/check",
"serviceName": "Kertivo Shield",
"tags": [
"base",
"usdc",
"security",
"address-poisoning",
"fraud"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Address-poisoning check before you send USDC on Base. Body {from, to} (or sender/recipient; chain=base, token=USDC only, others 400 not charged; optional contacts/known_addresses): scans the sender's recent Base USDC transfers for lookalikes (same first/last 4 hex) plus dust/zero-value transfers. No sender? {recipient, known_addresses} = offline contacts check; {address} alone scans its own history for poisoning signs. Returns risk low/medium/high, lookalikes, reasons, coverage."
}What the leaf hashes
{"body":"791feff79a71b23075e4bfce3a37d34d9c4140aab110bcfe4fe3381aabaed04d","id":19378,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025331588268,"prev":null,"subject":"x402_bazaar:https://paycheck.hectichustle.workers.dev/address/check","subject_kind":"source_record"}Proof
Its day has not closed yet. A day closes ten minutes after midnight UTC; the proof appears here then.