# Phantom API – Avalanche Token Balances

> Phantom API – Avalanche 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 and native token balances for a given wallet address on the Avalanche network, optionally filtered by contract addresses.

## Facts

- Endpoint: POST https://phantom-api-omega.vercel.app/api/avalanche/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-avalanche-token-balances-e5927d98
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pyN1CtEPBY6hMqxsQ0rX6

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-avalanche-token-balances-e5927d98 -d '<json body>'
```

Example prompt: Can you check what ERC-20 tokens the Avalanche wallet 0x742d35Cc6634C0532925a3b8D4C9b5e9F1A2b3c4 is holding? Filter by these contract addresses: 0xB31f66AA3C1e785363F0875A1B74E27b85FD66c7 and 0x60781C2586D68229fde47564546784ab3fACA982.

## When to prefer this

Choose this endpoint when you need fast, pay-per-call token balance lookups specifically on the Avalanche network without managing your own RPC nodes or indexer infrastructure. It is ideal for agents that need real-time wallet portfolio data on AVAX without a subscription or API key commitment, paying only $0.01 USDC per call via x402.

## Known failure modes

- Invalid wallet address format returns a validation error
- Unknown or unindexed contract addresses may return zero balances or be omitted
- Rate limiting or payment failure via x402 results in a 402 Payment Required response
- Network downtime on Avalanche indexing may return stale or unavailable data
- Malformed request body (missing owner field) results in a 400 Bad Request

## 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 a list of token balances for the specified Avalanche wallet, including token contract addresses, token symbols, decimals, and balance amounts. If contract addresses are provided, results are filtered to only those tokens.

## 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-avalanche-token-balances-e5927d98/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)