Blockchain And Crypto x402 offerings

Bundle BlockchainSecurity labels, risk score, classification, and wallet overview for one address.

ERC20 allowance on Base mainnet via RPC: how much a spender is approved to move from an owner balance, read with allowance(owner,spender) eth_call.

Resolve a Basename, Base's native ENS-equivalent, to its wallet address via the L2 Basenames resolver.

Fetch a Base mainnet block header and transaction hashes by number, tag (latest/earliest/safe/finalized), or hash via eth_getBlockByNumber/eth_getBlockByHash.

Latest Base mainnet block height via eth_blockNumber - the current chain tip.

Generic read-only eth_call against any Base mainnet contract - pass raw calldata, get the raw return data back.

Can I sell this token? Honeypot check that simulates a real buy then a real sell of a Base mainnet token in one atomic on-chain call via Uniswap V2 - if the sell reverts, that is a honeypot, reported with the exact decoded reason. Factual, never predictive.

Native ETH balance for one Base network address, read live from a public Base RPC node (eth_getBalance) and returned with the snapshot block it was read at.

Current Base network gas price, read live from a public Base RPC node (eth_gasPrice) and returned in both wei and gwei with the snapshot block it was read at.

Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.

Check whether a Base mainnet address is a contract via eth_getCode - returns bytecode size, zero for an externally-owned account.

Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.

ERC1155 multi-token balance for a wallet and token id on Base mainnet via balanceOf(address,uint256).

ERC20 token balance for a wallet on Base mainnet - balanceOf() and decimals() batched into one Multicall3 round trip.

ERC20 Transfer event logs for one token over a Base mainnet block range (max 2,000 blocks) via eth_getLogs.

Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.

Smart contract event logs on Base mainnet (Base contract events) via eth_getLogs - filter by contract address and up to 4 topics, up to 2,000 blocks, raw logs with topics, data, block and tx hash.

Base token sell check AT YOUR TRADE SIZE: simulates a buy of amountEth (0.001 to 10 ETH) and an immediate sell inside eth_call (no trade is sent) and reports the buy tax, the sell tax and the round-trip loss including price impact. Uniswap v2, v3, v4 (ETH, WETH, ZORA, USDC quotes) and Aerodrome. Measured at one block, not a guarantee, not financial advice.

Best time of day to send a transaction on Base: hours to avoid, cheapest hour (UTC), and what waiting saves in USD.

What the same transaction costs right now on Base, Optimism, Arbitrum and Ethereum, in USD, cheapest chain first.

Current gas price on Base and what a transaction costs in USD right now: base fee, priority tiers, ready-to-sign maxFeePerGas.

Base wallet score API / wallet reputation / address risk scoring / onchain wallet intelligence / counterparty check. Returns a 0-100 activity score with letter grade, smart-wallet (ERC-4337) detection, ETH and USDC balances, recent USDC flow, and a user profile for any Base address. For AI agents, fraud screening, and KYC/counterparty checks.

Base gas oracle / Base gas price API / Base L2 gas fee tracker / real-time gas estimator / swap cost estimator. Returns the current Base fee, fast/standard/slow priority tiers, the USD cost of a typical swap, and a congestion recommendation. For AI agents, trading bots, and wallets timing transactions on Base to minimize gas.

Base trader leaderboard API / smart money tracker / top Base wallets by USDC flow / onchain whale tracker / copy-trading signal. Ranks the most active Base wallets by net USDC flow, flagging smart wallets (ERC-4337), accumulators, and pass-through routers. For AI agents and copy-trading bots following smart money on Base.