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Wallet PnL & Cost Basis Calculator (ERC20 / Base)
x402
Wallet PnL & Cost Basis Calculator (ERC20 / Base) is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).
Computes realized profit and loss, average buy/sell price, cost basis, and remaining position for an ERC20 token in a wallet by analyzing on-chain DEX trades on Base against a quote asset (default USDC).
Price / call$0.1
Success—
StatusUnknown
How this service works
Realized profit and loss and cost basis for an ERC20 token in a wallet on Base, computed from on-chain DEX trades against a quote asset (USDC by default). Returns average buy and sell price, realized PnL, remaining position and cost basis. Search terms: wallet PnL, realized gains, cost basis, token profit, crypto tax accounting, trade history. Accepts payment on Base or Solana — either network works.
Output
Returns a structured object containing average buy price, average sell price, realized PnL (in the quote asset, default USDC), remaining token position size, and cost basis computed from on-chain DEX trade history on the Base network.
Example use cases
Example prompt
“What's my realized PnL and cost basis for the token at 0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed in my wallet 0xAbC123...def on Base — use USDC as the quote asset?”
Technical details
Endpoint
GEThttps://api.x402node.dev/wallet/pnlWhen to prefer
Use this endpoint when you need on-chain, DEX-derived realized PnL and cost basis for an ERC20 token on Base — ideal for crypto tax accounting, portfolio performance reporting, or DeFi trade analysis. Prefer this over off-chain or CEX-based PnL tools when the trades occurred on Base DEXes and you need average buy/sell prices and remaining position computed from actual blockchain data.
Side effects
- Wallet address not found or has no DEX trade history — returns empty or zero values
- ERC20 token address invalid or not traded on Base DEXes — returns error or null result
- No trades found against the specified quote asset — may return zero PnL
- RPC or indexing latency causes stale or incomplete trade data
- Malformed wallet or token address returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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