# Phantom API – SEI Token Balances

> Phantom API – SEI 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 2026-10-16).

Returns token balances for a given wallet address on the SEI blockchain, optionally filtered by specific contract addresses.

## Facts

- Endpoint: POST https://phantom-api-omega.vercel.app/api/sei/token/balances?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/phantom-api-sei-token-balances-98ffafb2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_E1H2Ay2CkJUxkxefP6JpH

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-sei-token-balances-98ffafb2 -d '<json body>'
```

Example prompt: What token balances does the SEI wallet sei1abc...xyz hold? Only show me balances for these contracts: 0x1234... and 0x5678....

## When to prefer this

Use this endpoint when you need fast, pay-per-call on-chain token balance lookups specifically on the SEI blockchain. Prefer this over general-purpose RPC calls when you want a simple JSON interface without setting up your own node, and when spot-checking balances for one or a handful of contract addresses at a time.

## Known failure modes

- Invalid or malformed SEI wallet address returns an error or empty result
- Unknown or non-existent contract address returns zero balance or error
- Network congestion or RPC node downtime causes timeout
- Payment failure via x402 protocol blocks the request
- Empty array returned if wallet holds no tokens matching the filter

## 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 associated with the specified SEI wallet address, including token identifiers and amounts held. 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-sei-token-balances-98ffafb2/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)