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SALT19 Base Wallet Balance Lookup
x402
SALT19 Base Wallet Balance Lookup is a paid API for AI agents from api.salt19.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns the native ETH balance (in ETH and Wei) of a given Ethereum address on the Base network (chain ID 8453)
Price / call$0.01
Success—
StatusUnknown
How this service works
SALT19 is an independent applied AI systems lab behind EvoMind governed cognition, the MCP-native Agent Utility Grid, the ARCS research community, AeroClear UAS flight intelligence, and practical software for real-world work.
Output
Returns a JSON object containing the network identifier (eip155:8453 for Base), the address's ETH balance as a decimal string, the balance in Wei as a string, and the block number at which the balance was read.
Example use cases
DeFi bot pre-flight balance check
“Before executing the swap, check how much ETH wallet 0x4a8B...c91F currently has on Base so I know if there's enough to cover gas.”
Agent treasury monitoring
“Check the ETH balance of our agent's treasury wallet 0x1234abcd...5678 on Base and tell me the balance in both ETH and Wei.”
User onboarding wallet verification
“Can you verify whether the new user's Base wallet 0xDead...Beef has any ETH in it yet — I want to know the current balance and which block it was read from.”
Technical details
Endpoint
POSThttps://api.salt19.com/v1/base-wallet-balanceWhen to prefer
Choose this endpoint when you need a fast, pay-per-call native ETH balance check on the Base network (chain 8453) without managing your own RPC infrastructure. Ideal for AI agents operating in the x402 micropayment ecosystem that need real-time balance data before executing on-chain actions. Prefer this over self-hosted RPC calls when you want metered, serverless access via a structured JSON API.
Side effects
- Invalid Ethereum address format (not matching ^0x[0-9a-fA-F]{40}$) returns a validation error
- Address with zero balance returns 0 for both ETH and Wei fields — not an error
- Network unavailability or Base RPC downtime may return a 5xx error
- Payment failure (insufficient USDC for x402 micropayment) blocks the request
- Missing or malformed address field in POST body returns a 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"balance_eth": "0",
"balance_wei": "0",
"block_number": 12345678
}
}Tags
x402
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