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BlockNotify Transaction Safety Analyzer
x402
BlockNotify Transaction Safety Analyzer is a paid API for AI agents from x402.blocknotify.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-11).
Simulates an EVM transaction before execution and returns an allow, warn, or block safety decision with detection of approval abuse, suspicious contracts, and failure conditions.
Price / call$0.05
Success—
StatusUnknown
How this service works
Transaction safety analysis for EVM wallets and AI agents. Simulates a transaction, detects approval abuse, suspicious contracts, and failure conditions, then returns an allow, warn, or block decision before execution.
Output
Returns a safety decision of allow, warn, or block along with detailed risk signals including detected approval abuse patterns, suspicious contract indicators, simulation success/failure status, and the reasons behind the decision — all before the transaction is broadcast to the network.
Example use cases
DeFi agent pre-execution guard
“I'm about to swap tokens on Arbitrum using my wallet 0x1234...abcd calling the router at 0xdead...beef with calldata 0x38ed1739... and no ETH value — can you simulate it and check for any approval abuse or suspicious behavior before I sign?”
Malicious contract detection for NFT mint
“Check if this NFT mint transaction is safe: I'm the sender 0xAABB...CC, the contract is 0x9988...77 on Ethereum, calldata is 0x1249c58b, and I'm sending 0.08 ETH — will it succeed, and does it look like a scam or rug pull?”
Autonomous agent transaction firewall
“My trading bot is about to execute a transaction on Polygon from 0xBot...wallet to 0xDEX...contract with calldata 0x5c11d795... and value 0x0 — block it automatically if the safety analysis returns anything other than allow.”
Technical details
Endpoint
POSThttps://x402.blocknotify.com/v1/analyze-transaction?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent or wallet needs a pre-execution safety gate — especially for DeFi interactions, token approvals, or interactions with unknown contracts — where detecting rug pulls, approval exploits, or revert conditions before signing is critical. Prefer it over generic simulation endpoints because it returns a clear actionable allow/warn/block decision with security-specific annotations, not just raw execution traces.
Side effects
- Invalid address format (not a valid 0x EVM address) returns a validation error
- Unsupported chain value outside the allowed enum returns a 400 error
- Malformed or non-hex calldata causes a parsing failure
- Simulation RPC unavailable for the target chain causes a timeout or 503
- Insufficient payment (x402 payment not provided or underpaid) returns a 402 Payment Required
- Value field not parseable as decimal or 0x-prefixed hex returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | Destination address (contract or EOA). |
| data | string | Calldata as a 0x-prefixed hex string. Use "0x" for plain native-value transfers. |
| from | string | Sender address (the wallet that would sign and broadcast). |
| chain | string | Target EVM chain. The merchant maps this to the appropriate RPC for simulation. |
| value | string | Native value in wei. Decimal ("1000000000000000000" = 1 ETH) or 0x-prefixed hex ("0xde0b6b3a7640000"). Use "0x0" for token-only transactions. |
Tags
x402
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