# Phantom API — Sei Network RPC Endpoint

> Phantom API — Sei Network RPC Endpoint 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 2026-09-15).

Provides JSON-RPC access to the Sei blockchain network, enabling queries and transactions on Sei via pay-per-call Web3 infrastructure.

## Facts

- Endpoint: POST https://phantom-api-omega.vercel.app/api/sei/rpc
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/phantom-api-sei-network-rpc-endpoint-339206da
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YTvmXqi4MX-254ccJVOLR

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-network-rpc-endpoint-339206da -d '<json body>'
```

Example prompt: Can you check the current block number and my account balance for address 0xABC123 on the Sei blockchain right now?

## When to prefer this

Choose this endpoint when you need fast, pay-per-call RPC access to the Sei blockchain without managing your own node or committing to a subscription. Ideal for agents making occasional or bursty Sei network queries, reading on-chain state, or broadcasting transactions to Sei with no infrastructure overhead.

## Known failure modes

- Invalid JSON-RPC method name returns method-not-found error
- Malformed params array causes invalid params error
- Network congestion or node unavailability causes timeout
- Insufficient x402 payment causes 402 Payment Required response
- Querying non-existent address or block returns null 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 standard JSON-RPC response objects containing blockchain data such as block information, account balances, transaction receipts, smart contract return values, or network status — matching standard Ethereum/Cosmos-compatible RPC response formats for the Sei network.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "method": {
   "type": "string"
  },
  "params": {
   "type": "array",
   "items": {}
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/phantom-api-sei-network-rpc-endpoint-339206da/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)