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ChainAnalyzer Address Poisoning Similarity Check
x402
ChainAnalyzer Address Poisoning Similarity Check is a paid API for AI agents from chain-analyzer.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-10).
Detects whether a destination blockchain address is a lookalike (address-poisoning attack) of any address in a caller-supplied list of trusted addresses, by comparing leading and trailing characters.
Price / call$0.05
Success—
StatusUnknown
How this service works
Is this destination a lookalike of an address the sender already trusts? Applies the address-poisoning similarity rule (leading and trailing characters that wallet UIs abbreviate to) between one destination and a caller-supplied list of known-good addresses. Pure string comparison when `known` is given, so it answers in milliseconds and never runs a scan.
Output
Returns whether the destination address matches the leading and trailing characters of any address in the known-good list, indicating a potential address-poisoning attack. Responses are delivered in milliseconds as a pure string comparison with no external scan required.
Example use cases
Pre-transfer address spoofing check
“I'm about to send USDC on Ethereum — can you verify that 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 isn't a poisoned lookalike of any address in my trusted list: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48, 0xdAC17F958D2ee523a2206206994597C13D831ec7?”
Wallet UI address substitution detection
“Someone just pasted a new address into my payment flow — check if 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 is trying to impersonate any of my whitelisted addresses on Ethereum: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96040, 0xAbcdef1234567890AbcDef1234567890aBcDeF12.”
DeFi protocol outbound address validation
“Before my smart contract releases funds to 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Polygon, run a poisoning similarity check against our treasury's known addresses: 0x742d35Cc6634C0532925a3b8A4Bc454e4438f44e and 0x1234567890abcdef1234567890abcdef12345678.”
Technical details
Endpoint
GEThttps://chain-analyzer.com/api/v1/x402/address/:address/poisoning-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need an instant, zero-latency check of whether a destination address visually mimics a trusted address — especially before executing a blockchain transfer. It is ideal for pre-flight address validation in wallets, DeFi protocols, or payment agents where speed is critical and no external blockchain scan is needed. Prefer it over full AML screening when the threat model is specifically address-poisoning/substitution attacks rather than sanctions or illicit fund flows.
Side effects
- Missing or malformed destination address returns an error response
- Empty or unparseable 'known' list may result in no comparison being performed
- Unsupported chain identifier may cause a validation error
- Very long 'known' lists may exceed query parameter size limits
- Network timeout or service unavailability returns a non-200 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | — | |
| output | — |
Tags
x402
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