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SendCheck EVM Address Pre-Send Verifier
x402
SendCheck EVM Address Pre-Send Verifier is a paid API for AI agents from sendcheck-x402.pennyforgeorg.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Verifies an EVM address before sending crypto by checking EIP-55 checksum, wallet-vs-contract classification, outgoing activity, token balances, and issuing a safety verdict
Price / call$0.01
Success—
StatusUnknown
How this service works
SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain}
Output
Returns a JSON object with: a checksum validity status (valid/invalid EIP-55), chain metadata (block number, native/USDC/USDT balances), classification (isContract true/false), outgoing transaction count, a structured verdict with a level (e.g. 'caution', 'safe', 'risky'), headline, reasons array, next-step advice, gas estimate for a test transfer, and a human-readable report string. Also includes service metadata like response time in ms and version.
Example use cases
Pre-transfer recipient safety check
“I'm about to send 500 USDC to 0xAbCd1234...5678 on Ethereum — can you verify the address first? I want to know if it's a real wallet, if it passes the checksum, and whether your verdict says it's safe.”
Detect smart contract vs EOA
“Is 0x1234ABCD...9876 on Arbitrum a smart contract or a regular wallet? I need to know before routing a payment there.”
Check inactive or suspicious address
“This address 0xDEAD...BEEF on Polygon looks suspicious to me — has it ever sent any outgoing transactions, and what's its current token balance? Give me the full verdict.”
Technical details
Endpoint
POSThttps://sendcheck-x402.pennyforgeorg.workers.dev/checkWhen to prefer
Choose SendCheck when you need a quick, multi-signal pre-send safety assessment of a single EVM address on a supported chain (Base, Ethereum, Arbitrum, Optimism, Polygon) and want structured verdict output including checksum, wallet/contract classification, activity history, and balances — all in one call for $0.01 USDC. Prefer this over raw RPC calls or block explorer lookups when you want an opinionated safety verdict rather than raw chain data.
Side effects
- Invalid or malformed EVM address (not 0x + 40 hex chars) returns validation error
- Unsupported chain value outside enum returns error
- Network timeout or RPC unavailability for the requested chain may return partial or failed response
- Address with zero on-chain history may return verdict level 'unknown' with limited data
- Payment failure (x402) results in 402 response before any check is performed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Chain to scan (default: base) |
| address | string | EVM address to verify, 0x + 40 hex characters. Free format pre-check: GET /validate?address=… |
Output
Schema · Response
{
"type": "json",
"example": {
"meta": {
"ms": 912,
"service": "sendcheck",
"version": "1.8.1"
},
"chain": {
"name": "Base",
"usdc": "30.23",
"usdt": "0.00",
"block": 50804109,
"chain": 8453,
"native": "0.0026",
"reachable": true,
"usdcUnits": "30230079",
"usdtUnits": "0",
"isContract": false,
"outgoingTxs": 3
},
"report": "SendCheck pre-send verification …",
"address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
"verdict": {
"gas": "0.00000039 ETH",
"next": "Verify the recipient out-of-band before sending.",
"level": "caution",
"reasons": [
"…"
],
"headline": "Live wallet with recent activity.",
"tokenMismatch": null
},
"checksum": {
"status": "valid",
"message": "Valid EIP-55 checksum address."
}
}
}Tags
x402
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