# Phantom API — Ethereum Token Balances

> Phantom API — Ethereum 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).

Fetches ERC-20 token balances for a given Ethereum wallet address across specified contract addresses

## Facts

- Endpoint: POST https://phantom-api-omega.vercel.app/api/ethereum/token/balances
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/phantom-api-ethereum-token-balances-ce5b2e79
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WajQOz2Bf4pJwEwYO8_c-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability phantom-api-ethereum-token-balances-ce5b2e79 -d '<json body>'
```

Example prompt: Can you check all the ERC-20 token balances for Ethereum wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045, specifically for USDC (0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48) and USDT (0xdAC17F958D2ee523a2206206994597C13D831ec7)?

## When to prefer this

Use this endpoint when you need real-time, on-chain ERC-20 token balance lookups for Ethereum wallets without managing your own node infrastructure. Ideal for agents that need portfolio snapshots, eligibility checks, or balance verification on Ethereum, especially when pay-per-call pricing ($0.01 USDC via x402) is preferable to a subscription model. Best suited for targeted queries with known contract addresses rather than broad multi-chain portfolio scanning.

## Known failure modes

- Invalid Ethereum address format returns a validation error
- Unknown or non-ERC-20 contract address may return zero balance or an error
- Rate limiting or payment failure (x402) prevents the call from completing
- Network congestion may cause slower-than-expected responses
- Empty contractAddresses array may return an error or empty result

## 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

Returns on-chain ERC-20 token balance data for the specified owner address across the provided contract addresses, including token amounts held in the wallet on the Ethereum network.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "owner": {
   "type": "string"
  },
  "contractAddresses": {
   "type": "array",
   "items": {
    "type": "string"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/phantom-api-ethereum-token-balances-ce5b2e79/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from phantom-api-omega.vercel.app](https://www.zero.xyz/host/phantom-api-omega.vercel.app/llms.txt)