x402-paid on-chain tools: wallet report, contract scan, token risk, gas, address labels (USDC/Base)
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ENS <-> address resolution and malicious-address flags (phishing, scam, sanctions, mixer). Paid $0.01 USDC on Base via x402.
address or ENS name
Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms.
This tool isn't marked read-only, so it may change something on the server or in an account you connected.
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
claude mcp add --transport http chaincheck https://chaincheck-api.netlify.app/mcp
ENS <-> address resolution and malicious-address flags (phishing, scam, sanctions, mixer). Paid $0.01 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| q* | string | address or ENS name |
| x402_payment | string | Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms. |
{
"type": "object",
"required": [
"q"
],
"properties": {
"q": {
"type": "string",
"description": "address or ENS name"
},
"x402_payment": {
"type": "string",
"description": "Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms."
}
}
}Smart-contract risk scan: proxy/admin, owner, mint, blacklist, pause, fee-change, trading toggle flags. Paid $0.02 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| chain* | string | ethereum|base|arbitrum|optimism|polygon|bsc|avalanche |
| address* | string | |
| x402_payment | string | Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms. |
{
"type": "object",
"required": [
"chain",
"address"
],
"properties": {
"chain": {
"type": "string",
"description": "ethereum|base|arbitrum|optimism|polygon|bsc|avalanche"
},
"address": {
"type": "string"
},
"x402_payment": {
"type": "string",
"description": "Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms."
}
}
}Live gas on 7 EVM chains with USD cost of transfer/swap and cheapest chain. Paid $0.005 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| x402_payment | string | Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms. |
{
"type": "object",
"properties": {
"x402_payment": {
"type": "string",
"description": "Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms."
}
}
}Free. Lists Chain Check tools, prices and how to pay (x402, USDC on Base).
No arguments.
{
"type": "object",
"properties": {}
}ERC-20 token risk score 0-100 (honeypot, taxes, mint, hidden owner, blacklist, LP lock, top holders). Paid $0.02 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| chain* | string | ethereum|base|arbitrum|optimism|polygon|bsc|avalanche |
| address* | string | |
| x402_payment | string | Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms. |
{
"type": "object",
"required": [
"chain",
"address"
],
"properties": {
"chain": {
"type": "string",
"description": "ethereum|base|arbitrum|optimism|polygon|bsc|avalanche"
},
"address": {
"type": "string"
},
"x402_payment": {
"type": "string",
"description": "Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms."
}
}
}Multi-chain EVM wallet report (7 chains): native/USDC/USDT balances, tx counts, contract + EIP-7702 detection. Paid $0.01 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| address* | string | |
| x402_payment | string | Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms. |
{
"type": "object",
"required": [
"address"
],
"properties": {
"address": {
"type": "string"
},
"x402_payment": {
"type": "string",
"description": "Optional x402 v2 payment payload (value of PAYMENT-SIGNATURE header, base64). Omit to receive payment terms."
}
}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 2, 2026.
No readOnlyHint / destructiveHint annotations, so clients can't tell a read from a write without asking.
Fix: Add annotations to each tool, e.g. { readOnlyHint: true } for tools that only read.