13 free Base tools: address labels, tx explain, balances, receipts, gas, logs, bytecode.
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Estimate gas needed for a transaction. Useful for dapps and wallets to show users how much gas they'll pay.
| Name | Required | Description | Default |
|---|---|---|---|
| to | Yes | Recipient address (0x + 40 hex) | |
| from | Yes | Sender address (0x + 40 hex) | |
| value | No | ETH value to send (in wei, hex) |
Explain a transaction in plain English: who sent what to whom, with address labels. FREE simplified version of our premium explain tool.
| Name | Required | Description | Default |
|---|---|---|---|
| tx_hash | Yes | Transaction hash (0x + 64 hex) |
Get a human-readable label for an EVM address (100K+ entity labels: exchanges, bridges, protocols, scams). FREE, no payment required.
| Name | Required | Description | Default |
|---|---|---|---|
| address | Yes | EVM address (0x + 40 hex) |
Get ETH balance of an address on Base
| Name | Required | Description | Default |
|---|---|---|---|
| address | Yes | EVM address (0x + 40 hex) |
Get block details by block number: timestamp, miner, transaction count, gas used.
| Name | Required | Description | Default |
|---|---|---|---|
| block_number | Yes | Block number (decimal) |
Get the current latest block number on Base
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
Get contract bytecode at an address. Useful for checking if an address is a contract or a wallet.
| Name | Required | Description | Default |
|---|---|---|---|
| address | Yes | EVM address (0x + 40 hex) |
Get event logs from a contract in a block range. Useful for tracking transfers, approvals, etc.
| Name | Required | Description | Default |
|---|---|---|---|
| to_block | Yes | End block number (decimal) | |
| from_block | Yes | Start block number (decimal) | |
| contract_address | Yes | Contract address (0x + 40 hex) |
Get current gas price on Base
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
Get transaction details by hash on Base
| Name | Required | Description | Default |
|---|---|---|---|
| tx_hash | Yes | Transaction hash (0x + 64 hex) |
Get transaction receipt by hash: success/failure status, gas used, logs. Useful for checking if a tx succeeded.
| Name | Required | Description | Default |
|---|---|---|---|
| tx_hash | Yes | Transaction hash (0x + 64 hex) |
Get USDC balance of an address on Base (stablecoin balance, more useful than ETH for most agents)
| Name | Required | Description | Default |
|---|---|---|---|
| address | Yes | EVM address (0x + 40 hex) |
Search all labeled addresses by category (e.g. exchange, bridge, protocol, scam). Returns up to 50 matches.
| Name | Required | Description | Default |
|---|---|---|---|
| category | Yes | Category to search: exchange, bridge, protocol, scam, nft, defi, other |
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
estimate_gasexplain_transaction_simpleget_address_labelget_balanceget_block_by_numberget_block_numberget_contract_codeget_contract_logsget_gas_priceget_transactionget_transaction_receiptget_usdc_balancesearch_labels_by_categoryBase on-chain address labels (eth-labels 104k category tags), tx explainer, clusters, CCTP USDC.
8 CIPHER tools — Solana scan, breach check, Jito, FRED, Drift, repo health, more. x402-paid on Base.
15 data tools at $0.01 USDC/call on Base via x402. Free discovery; x402 wallet client required.
Read-only on-chain intelligence for AI agents on Base: balances, tokens, gas, tx status.
Add one secure layer between your agents and this server.