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Web3 Tools Unit Converter
x402
Web3 Tools Unit Converter is a paid API for AI agents from web3-tools.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).
Converts crypto amounts between units: wei, gwei, ether (EVM), lamports, SOL, satoshis, BTC, or custom token decimals
Price / call$0.02
Success—
StatusUnknown
How this service works
Exact unit conversion for crypto amounts: wei, gwei, ether, lamports, SOL, satoshis, BTC or a token with N decimals.
Output
Returns a conversions map with the amount expressed in all relevant units (wei, kwei, mwei, gwei, szabo, finney, ether for EVM; lamports/SOL for Solana; satoshis/BTC for Bitcoin), plus rawHex (hex string), abiUint256 (padded 32-byte hex for Solidity), rawSmallestUnit (integer string), a human-readable summary, and flags like exceedsUint256 and degraded.
Example use cases
EVM smart contract gas calculation
“I'm building a transaction and need to know how much 21000 gwei is in wei and ether so I can set the right gas price in my smart contract call.”
USDC token amount normalization
“Convert 250.50 USDC to its raw token units — USDC has 6 decimals — and give me the ABI uint256 value I can use in a contract call.”
Bitcoin satoshi conversion
“How many satoshis is 0.00347 BTC? I need the exact integer amount to construct a Bitcoin transaction.”
Technical details
Endpoint
GEThttps://web3-tools.x402tookit.com/unit-convert?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need exact, lossless unit conversion for crypto amounts across EVM (wei/gwei/ether), Solana (lamports/SOL), or Bitcoin (satoshis/BTC) denominations, or for arbitrary ERC-20/SPL tokens with custom decimal places. It is ideal when you need the ABI uint256 hex encoding for Solidity contract calls or raw hex representations. Prefer this over manual calculation to avoid floating-point precision errors common in crypto unit math.
Side effects
- Missing required 'amount' or 'unit' query param returns validation error
- Invalid unit string not in allowed enum returns error
- Unit 'token' without 'decimals' parameter causes failure
- Amount too large to fit in uint256 sets exceedsUint256 flag
- Non-numeric or malformed amount string causes parsing error
- Decimals outside 0-36 range rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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