Base on-chain data for agents: balances, prices, transfers, Basenames, contracts. x402 pay-per-call.
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Base (chain 8453) address snapshot: EOA vs contract vs EIP-7702, ETH balance, nonce, code size and native USDC balance, at the latest block. Costs $0.002 USDC on Base via x402.
0x-prefixed Base address
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
claude mcp add --transport http baselens https://baselens-api.vercel.app/mcp
Base (chain 8453) address snapshot: EOA vs contract vs EIP-7702, ETH balance, nonce, code size and native USDC balance, at the latest block. Costs $0.002 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| address* | string | 0x-prefixed Base address |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"address"
],
"properties": {
"address": {
"type": "string",
"description": "0x-prefixed Base address"
}
}
}Lists every BaseLens tool with price, inputs and the equivalent x402 HTTP URL.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {}
}Contract check on Base: is it a contract, code size, owner(), proxy implementation, and whether the source (and implementation) is verified on Sourcify, plus plain-language notes. Not an audit. Costs $0.003 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| address* | string | 0x-prefixed Base address |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"address"
],
"properties": {
"address": {
"type": "string",
"description": "0x-prefixed Base address"
}
}
}ERC-20 balance of any address for any token on Base, with symbol and decimals already applied (raw and human-readable). Costs $0.002 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| token* | string | ERC-20 token contract on Base |
| address* | string | 0x-prefixed Base address |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"token",
"address"
],
"properties": {
"token": {
"type": "string",
"description": "ERC-20 token contract on Base"
},
"address": {
"type": "string",
"description": "0x-prefixed Base address"
}
}
}Free sample: latest Base block number and base fee (gwei). Use it to test the connection.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {}
}Current Base gas: base fee, gas price, suggested EIP-1559 max fee and priority fee (gwei), block fullness, and cost of a plain ETH transfer. Costs $0.001 USDC on Base via x402.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {}
}Resolve a Basename (name.base.eth) or ENS name to its Base/Ethereum address, or reverse-resolve an address to its primary ENS/Basename. Includes avatar record. Costs $0.001 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| name | string | ENS or Basename, e.g. jesse.base.eth or vitalik.eth |
| address | string | Alternative: 0x address to reverse-resolve |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"name": {
"type": "string",
"description": "ENS or Basename, e.g. jesse.base.eth or vitalik.eth"
},
"address": {
"type": "string",
"description": "Alternative: 0x address to reverse-resolve"
}
}
}On-chain USDC price of any Base ERC-20: executable Uniswap v3 quote for 1 whole token (direct USDC pool or via WETH, best fee tier). No third-party price API. Costs $0.003 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| token* | string | ERC-20 token contract on Base |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"token"
],
"properties": {
"token": {
"type": "string",
"description": "ERC-20 token contract on Base"
}
}
}Token facts on Base: name, symbol, decimals, total supply, contract code size, owner() and EIP-1967 proxy implementation, plus plain-language notes (upgradeable? owner renounced?). Read-only facts, not advice. Costs $0.003 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| token* | string | Token contract on Base |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"token"
],
"properties": {
"token": {
"type": "string",
"description": "Token contract on Base"
}
}
}Recent ERC-20 transfers in and out of an address on Base for up to 5 tokens (default USDC), newest first, over the last ~10k blocks (max 30k). Check incoming payments or wallet activity. Costs $0.004 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| limit | string | Max transfers to return, ≤200 (default 50) |
| blocks | string | Lookback in blocks, 100–30000 (default 10000) |
| tokens | string | Optional comma-separated token contracts (max 5). Default USDC. |
| address* | string | 0x-prefixed Base address |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"address"
],
"properties": {
"limit": {
"type": "string",
"description": "Max transfers to return, ≤200 (default 50)"
},
"blocks": {
"type": "string",
"description": "Lookback in blocks, 100–30000 (default 10000)"
},
"tokens": {
"type": "string",
"description": "Optional comma-separated token contracts (max 5). Default USDC."
},
"address": {
"type": "string",
"description": "0x-prefixed Base address"
}
}
}Human-readable summary of a Base transaction: status, block time, from/to, value, total fee (incl. L1 fee), and decoded ERC-20 Transfer events with token symbols and amounts. Handy to verify a payment landed. Costs $0.003 USDC on Base via x402.
| Argument | Type | Description |
|---|---|---|
| hash* | string | 0x-prefixed transaction hash on Base |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"hash"
],
"properties": {
"hash": {
"type": "string",
"description": "0x-prefixed transaction hash on Base"
}
}
}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 Oct 30, 2026.
Takes a password, API key or token as an argument, so the secret passes through the model's context and chat logs.
Fix: Read credentials from the server's own configuration (environment, OAuth) instead of a tool argument.