Pre-send EVM address checks: free pre-check, $0.01 check, $0.05 deep scan. x402: payment is auth.
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Paid pre-send verification of one EVM address on one chain ($0.01 USDC via x402, EIP-3009 on Base): checksum, wallet-vs-contract, outgoing activity, native/USDC/USDT balances, leveled verdict with reasons and next action. TWO-PHASE: call without x_payment first to get the exact payment challenge (payTo, amount, asset), sign the USDC transfer, then call again with x_payment = the resulting X-Payment header to get the report. No account, no API key — the payment is the authentication.
EVM address, 0x + 40 hex characters
Chain to scan (default: base)
X-Payment header value from your signed EIP-3009 transfer (second phase only)
This tool isn't marked read-only, so it may change something on the server or in an account you connected.
Paid pre-send verification of one EVM address on one chain ($0.01 USDC via x402, EIP-3009 on Base): checksum, wallet-vs-contract, outgoing activity, native/USDC/USDT balances, leveled verdict with reasons and next action. TWO-PHASE: call without x_payment first to get the exact payment challenge (payTo, amount, asset), sign the USDC transfer, then call again with x_payment = the resulting X-Payment header to get the report. No account, no API key — the payment is the authentication.
| Argument | Type | Description |
|---|---|---|
| chain | string | Chain to scan (default: base) |
| address* | string | EVM address, 0x + 40 hex characters |
| x_payment | string | X-Payment header value from your signed EIP-3009 transfer (second phase only) |
{
"type": "object",
"required": [
"address"
],
"properties": {
"chain": {
"enum": [
"base",
"ethereum",
"arbitrum",
"optimism",
"polygon"
],
"type": "string",
"description": "Chain to scan (default: base)"
},
"address": {
"type": "string",
"description": "EVM address, 0x + 40 hex characters"
},
"x_payment": {
"type": "string",
"description": "X-Payment header value from your signed EIP-3009 transfer (second phase only)"
}
}
}Paid deep scan: the full verification across ALL FIVE chains (Base, Ethereum, Arbitrum, Optimism, Polygon) incl. wrong-network detection and USDC/USDT token-mismatch flags ($0.05 USDC via x402, EIP-3009 on Base). TWO-PHASE like check_address: first call returns the payment challenge; second call with x_payment returns the report.
| Argument | Type | Description |
|---|---|---|
| address* | string | EVM address, 0x + 40 hex characters |
| x_payment | string | X-Payment header value from your signed EIP-3009 transfer (second phase only) |
{
"type": "object",
"required": [
"address"
],
"properties": {
"address": {
"type": "string",
"description": "EVM address, 0x + 40 hex characters"
},
"x_payment": {
"type": "string",
"description": "X-Payment header value from your signed EIP-3009 transfer (second phase only)"
}
}
}FREE pre-send check of an EVM address: EIP-55 checksum verification (catches typos, dropped characters, clipboard malware) + a note that a passing checksum is a spell-check, not payee verification. Run this before paying for check_address.
| Argument | Type | Description |
|---|---|---|
| address* | string | EVM address, 0x + 40 hex characters (any casing) |
{
"type": "object",
"required": [
"address"
],
"properties": {
"address": {
"type": "string",
"description": "EVM address, 0x + 40 hex characters (any casing)"
}
}
}