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Phantom API — Arbitrum RPC Endpoint
x402
Phantom API — Arbitrum 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 2026-09-14).
Provides pay-per-call JSON-RPC access to the Arbitrum network, enabling blockchain data queries and smart contract interactions on Arbitrum via the standard Ethereum RPC interface.
Price / call$0.01
Success—
StatusUnknown
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 Ethereum JSON-RPC response objects containing requested blockchain data such as balances (in wei), block objects, transaction receipts, smart contract return values, gas estimates, or event logs, depending on the method called.
Example use cases
DeFi portfolio balance checker
“Check the ETH balance on Arbitrum for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — use the latest block.”
Smart contract state read
“Call the balanceOf function on the Arbitrum USDC contract at 0xaf88d065e77c8cC2239327C5EDb3A432268e5831 for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045.”
Transaction confirmation check
“Look up the receipt for Arbitrum transaction 0x4f1e2b9a3c8d7e6f5a4b3c2d1e0f9a8b7c6d5e4f3a2b1c0d9e8f7a6b5c4d3e2f1 and tell me if it succeeded.”
Technical details
Endpoint
POSThttps://phantom-api-omega.vercel.app/api/arbitrum/rpcWhen to prefer
Choose this endpoint when you need pay-per-call, no-subscription Arbitrum RPC access billed in USDC via x402 micro-payments — ideal for agents that make sporadic or low-volume on-chain queries without committing to a monthly RPC plan. Prefer over free public endpoints when reliability and response speed matter.
Side effects
- Invalid JSON-RPC method name returns an error object with code -32601
- Malformed params array causes -32602 invalid params error
- Payment failure (insufficient x402 balance) blocks the request before it reaches the RPC node
- Network congestion or node unavailability may cause timeouts
- Calls to non-existent contracts return 0x or empty data without explicit error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| method | string | |
| params | array |
Tags
x402
Reviews
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