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ERC-20 Transfer History API (Base/Optimism/Mainnet)
x402
ERC-20 Transfer History API (Base/Optimism/Mainnet) is a paid API for AI agents from x402-audit.tatschluizguilherme.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Fetches full ERC-20 transfer history (incoming and outgoing, all tokens) for any wallet address on Base, Optimism, or Ethereum Mainnet, with decoded transfer details and native ETH balance delta.
Price / call$0.1
Success—
StatusUnknown
How this service works
Pay-per-call on-chain API for AI agents and developers: wallet audits, token safety audits (honeypot detection), live gas prices, token prices, transaction receipts, balances, ENS resolution, block data, ERC-20 allowances, transaction simulation, swap quotes and multicall batches — all computed on-chain via public RPCs (no external market API). Pay per request in USDC on Base via the x402 exact scheme (EIP-3009 transferWithAuthorization). No API key, no signup, no subscription.
Output
A list of ERC-20 transfer events for the given wallet, each containing: direction (in/out), block number, unix and ISO timestamps, transaction hash, log index, token contract address, decoded from/to addresses, and formatted transfer value using the token's own decimals. Also includes the native ETH balance delta (before/after) over the queried window, and a rangeHint if the window was auto-shrunk for busy wallets.
Example use cases
Verify bounty payout reached recipient
“Check if the bounty payment we sent to 0x742d35Cc6634C0532925a3b8D4C9A9f2d15E on Optimism actually landed — show me the incoming ERC-20 transfers and confirm the token, amount, and transaction hash.”
Airdrop receipt confirmation for users
“I need to confirm that wallet 0xDEADBEEF1234567890abcdef1234567890abcdef received their airdrop tokens on Ethereum Mainnet — pull all incoming ERC-20 transfers with timestamps and decoded values.”
Audit outgoing token activity for a busy wallet
“Give me a full audit of all outgoing ERC-20 transfers from 0x1234567890abcdef1234567890abcdef12345678 on Base over the last available block range, including the ETH balance delta before and after.”
Technical details
Endpoint
GEThttps://x402-audit.tatschluizguilherme.workers.dev/historyWhen to prefer
Choose this endpoint when you need comprehensive ERC-20 transfer history across all tokens for a wallet without knowing specific token contract addresses, especially for payment verification, airdrop confirmation, or bounty auditing on Base, Optimism, or Ethereum Mainnet. Prefer it over raw eth_getLogs endpoints when you want decoded, human-readable transfer values with direction labels and ETH balance deltas included in one call.
Side effects
- Invalid or malformed wallet address returns an error
- Unsupported network name returns a validation error
- Block range too wide for busy wallet — auto-shrunk with rangeHint returned
- RPC provider unavailable or rate-limited causes a 5xx error
- No transfers found in range returns empty list (not an error)
- Historical balance unavailable on some RPC nodes means ETH delta may be null
Output
Schema · Response
{
"type": "json",
"example": {
"count": 5,
"native": {
"direction": "in",
"afterFormatted": "41928.8859153",
"deltaFormatted": "200.98828849",
"beforeFormatted": "41727.89762681"
},
"address": "0x000000000004444c5dc75cb358380d2e3de08a90",
"network": "mainnet",
"toBlock": "25685762",
"direction": "both",
"fromBlock": "25684762",
"transfers": [
{
"token": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
"txHash": "0xf2e57568318a9f30f1…",
"decoded": {
"args": {
"to": "0x000000000004444c…",
"from": "0x278d858f…",
"value": "71735844",
"symbol": "USDC",
"valueFormatted": "71.735844"
},
"event": "Transfer"
},
"direction": "in",
"timestamp": 1785914235,
"blockNumber": 25685765,
"timestampISO": "2026-08-04T23:17:15.000Z"
}
],
"truncated": true,
"blockRange": "1000",
"requestedAt": "2026-08-05T02:20:00.000Z"
}
}Tags
x402
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