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Phantom API — Base Token Balances
x402
Phantom API — Base Token Balances is a paid API for AI agents from phantom-api-omega.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns ERC-20 token balances on the Base network for a given wallet address, optionally filtered by specific contract addresses
Price / call$0.01
Success—
StatusUnknown
How this service works
Lightning-fast access to blockchain data, smart contract insights, and Web3 infrastructure across 57+ networks. Pay-per-call via x402.
Output
A list of token balances for the specified owner wallet on the Base network, including token amounts for each ERC-20 contract address provided (or all held tokens if no contracts are specified).
Example use cases
DeFi portfolio snapshot on Base
“Can you pull all the token balances for my Base wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 and tell me what ERC-20 tokens I'm holding?”
Verify user holds required token
“Check if wallet 0x1234567890abcdef1234567890abcdef12345678 holds any USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base — I need to confirm they meet the token-gating requirement.”
Monitor whale wallet token positions
“Look up the current ERC-20 token balances on Base for wallet 0xabc123def456abc123def456abc123def456abc1, specifically for these three contracts: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, 0x4200000000000000000000000000000000000006, and 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb.”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/base/token/balancesWhen to prefer
Use this endpoint when you need fast, pay-per-call ERC-20 token balance lookups specifically on the Base network without setting up your own RPC node or indexer. Ideal for agents that need lightweight, on-demand balance checks for one or more token contracts for a given wallet, especially when cost-per-query matters more than a subscription model.
Side effects
- Invalid or malformed wallet address returns an error or empty result
- Unknown or invalid contract address returns zero balance or an error
- Network unavailability or RPC outage causes a timeout or 5xx error
- Payment failure via x402 returns a 402 Payment Required response
- Empty contractAddresses array may return all tokens or require at least one entry depending on implementation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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