# Phantom API — Monad Token Balances

> Phantom API — Monad 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 2026-10-20).

Fetches ERC-20 and native token balances for a given wallet address on the Monad blockchain network, optionally filtered by contract addresses.

## Facts

- Endpoint: POST https://phantom-api-omega.vercel.app/api/monad/token/balances?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/phantom-api-monad-token-balances-043bb802
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_X1oSbThQke1lYZy4aRVlf

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-monad-token-balances-043bb802 -d '<json body>'
```

Example prompt: Check all token balances for the Monad wallet 0x1234abcd...5678, and also look up the specific balance for the USDC contract at 0xabc...def.

## When to prefer this

Choose this endpoint when you specifically need token balance data on the Monad blockchain network. It supports targeted lookups by contract address, making it ideal for checking specific token holdings rather than scanning entire portfolios. Prefer this over generic multi-chain endpoints when Monad is your target network and you need fast, pay-per-call access without a subscription.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Non-existent contract address returns zero balance or error
- Monad network downtime or congestion may cause delays or failures
- Missing required 'owner' field results in a bad request error
- Payment failure via x402 protocol blocks the call

## 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 token balance data for the specified wallet owner on the Monad network, including balances for native tokens and any specified ERC-20 contract addresses — typically including token amounts, contract addresses, and potentially token metadata such as symbol and decimals.

## 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-monad-token-balances-043bb802/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)