32 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
The check before the riskiest moment — signing. Decodes raw unsigned calldata (approve / permit / transfer / setApprovalForAll), shows the exact intent (who gets power over what, and whether it's UNLIMITED), and screens...
Stablecoin parallel-rate premium — how far the street price of a digital dollar (per-venue USDT quotes) diverges from the official FX rate in capital-controlled economies: venue table, median street rate, premium %, sign...
Transaction decoder for agents and users who need to know what a raw EVM transaction actually does: function call, parameters, and token transfers in plain English. Category: data.
Exact unit conversion for crypto amounts: wei, gwei, ether, lamports, SOL, satoshis, BTC or a token with N decimals.
Turn raw calldata into plain meaning before your agent signs. Send data; you get the function name, signature and arguments plus risk flags: unlimited token approval, setApprovalForAll, ownership transfer, unknown select...
Decode calldata. Decode EVM transaction calldata into the function and its arguments with viem: give the function signature (transfer(address,uint256)), or leave it out to try common ERC-20, ERC-721, ERC-1155, WETH, perm...
Non-custodial swap calldata for Base: give tokenIn, tokenOut, raw amountIn, slippage and recipient; we read Aerodrome and Uniswap V3 on-chain state, pick the max-output route, and return ready-to-sign transaction calldat...
Payment flow verification for agents integrating x402: confirms your wallet and payment channel work before you spend on a real endpoint, and returns the full service catalog with prices and example inputs. Category: inf...
Decode EVM smart-contract transaction calldata into the function name and typed parameters. Supply an ABI (from /api/contract-abi) or a signature like transfer(address,uint256) for a fully offline decode; with neither, t...
Build the transaction that revokes a contract's permission over an ERC-20 token (approve(spender, 0)): target and calldata ready to sign in your wallet. Nothing is sent.
Encode a contract function call (calldata) from its signature and arguments, e.g. transfer(address,uint256) with [to, amount]: selector and hex data ready to sign or simulate.
Decode EVM calldata recursively (depth 4, 32 KB) into ranked candidate signatures and args; GET ?selector=0x.. looks up one selector. Price is $0.005 per call for a decoded answer; a selector not in the dataset answers 4...
Pure-CPU helper: turn a B20 feature string (e.g. base.b20_asset) into its bytes32 feature id and ready-to-send isActivated(bytes32) calldata for the Activation Registry. No network egress.
Decode EVM calldata (transaction input) with the function signature you provide, checking that it matches the selector, or decode return data with its output types (e.g. uint256,address). Local calculation, no third-part...
Decode an EVM transaction and its event logs with a caller-supplied ABI. Base, Polygon, Arbitrum, Optimism or Avalanche. $0.003 per completed decode; unknown selectors retain raw data.
Decode EVM transaction input data: looks up the 4-byte function selector and decodes every argument (addresses, amounts, arrays). Use to see what a transaction or signing request will really do.
Use when an agent needs a contract value that none of the typed routes covers: it runs any read-only call with your own calldata on five chains and returns the raw 32-byte result plus asUint, so you can decode it yoursel...
Decode raw EVM calldata. Pass ?data= (0x hex, at most 4,000 characters in all). Returns the 4-byte selector, candidate function signatures and the decoded ar...
ABI-encode a function call (selector + args) or encode/decode arbitrary ABI types — build and parse EVM calldata correctly.
Decode a Base transaction's calldata into a human-readable function call and arguments — ERC-20 transfer/approve and the EIP-3009 transferWithAuthorization used by x402 settlements. Recognizes x402 settlement transaction...
Decode raw EVM calldata into function + typed params via openchain.xyz — $0.001 USDC
UTC time and latest Base block. Use when you need a clock.
Live x402 seller health check: fetches /.well-known/x402(.json) and the unpaid 402 challenge; reports reachable, TLS, schema OK, network, asset, payTo, price, latency. SSRF-safe, no chain reads.
Live Korea kimchi premium: Upbit KRW vs global USD for BTC and ETH, plus USD/KRW FX. Korea crypto arb/sentiment signal. Optional symbols=BTC,ETH filter. Alias: /kr/kimchi-premium.