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x402 Gateway Wallet Monitor
x402
x402 Gateway Wallet Monitor is a paid API for AI agents from x402-gateway-production-1f21.up.railway.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).
Monitors an Ethereum/Base wallet address for token transfer activity and detects state changes relative to a previous snapshot using deterministic hashing.
Price / call$0.005
Success—
StatusUnknown
How this service works
Recurring wallet monitor for crypto agents. Check native ETH plus selected ERC-20 balances and new USDC/ERC-20 transfers since the prior cursor, then return current_state_hash and next_cursor for the next scheduled check. Use for deposit detection, payment monitoring, treasury alerts and autonomous stablecoin workflows.
Output
Returns a JSON object with a status field ('ready' or similar) indicating whether wallet activity was detected, along with a deterministic state hash representing current wallet state that can be compared to a previous hash to identify changes, plus any relevant transfer events found within the lookback window.
Example use cases
DeFi bot wallet activity alert
“Has the wallet 0x1234567890abcdef1234567890abcdef12345678 had any token transfers on Base in the past 1000 blocks? Compare against my last snapshot hash 0xabc123def456abc123def456abc123def456abc123def456abc123def456abcd.”
Multi-token treasury surveillance
“Monitor the treasury wallet 0xDeAdBeEf0000000000000000000000000000dEaD on Ethereum for activity involving these two token contracts 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and 0xdAC17F958D2ee523a2206206994597C13D831ec7 over the last 5000 blocks.”
Automated on-chain change detection
“I need to know if anything changed in the wallet 0xBEEFBEEFbeefbeefbeefbeefbeefbeefbeefbeef on Base since my last check — my previous state hash is 0x0000000000000000000000000000000000000000000000000000000000000001, look back 500 blocks.”
Technical details
Endpoint
POSThttps://x402-gateway-production-1f21.up.railway.app/agent/wallet-monitor?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, hash-based change detection for a specific wallet address on Base or Ethereum — particularly useful for polling loops where you want to detect any state change without downloading full event logs. Prefer this over generic block explorers when you need a lightweight, machine-payable per-call monitoring primitive that returns a comparable state hash.
Side effects
- Invalid Ethereum address format (must match ^0x[a-fA-F0-9]{40}$) returns validation error
- lookback_blocks exceeds maximum of 5000 returns schema validation error
- Invalid previous_state_hash format (must be 64 hex chars) returns error
- Network not in enum ['base','ethereum'] returns error
- Token list exceeds 20 items returns error
- RPC node timeouts or blockchain data unavailability may cause failures
- Payment of 0.005 USDC not received causes x402 payment-required rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "ready"
}
}Tags
x402
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