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SALT19 Agent Utility Grid – Base Token Balance Lookup
x402
SALT19 Agent Utility Grid – Base Token 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 on-chain ERC-20 token balance for a given wallet address and token contract at the latest block.
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 with the token symbol (e.g. 'USDC'), decimal precision (e.g. 6), the block number at which the balance was read, and the balance in atomic (smallest) units as a string (e.g. '1000000' for 1 USDC). The agent must divide the atomic balance by 10^decimals to get the human-readable amount.
Example use cases
Pre-flight agent treasury check
“Before the agent runs its next task, check how much USDC is sitting in wallet 0xAbC123...4567 using the USDC contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 so I know if there are enough funds.”
DeFi eligibility verification
“Tell me whether wallet 0xDEF456...7890 holds any of the governance token at contract 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984 — I need the raw atomic balance and how many decimals it uses.”
Multi-wallet portfolio snapshot
“Pull the on-chain token balance for wallet 0x111222...AAAB for the WETH contract at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 and tell me the symbol, decimals, and balance as of the latest block.”
Technical details
Endpoint
POSThttps://api.salt19.com/v1/base-token-balanceWhen to prefer
Use this endpoint when you need a fast, pay-per-call on-chain ERC-20 balance lookup with no API key setup, accessible via the x402 micropayment protocol. It is particularly suited for AI agents in the SALT19 / Agent Utility Grid ecosystem that already handle x402 payments natively. Prefer it over free RPC calls when you want a managed, low-friction single endpoint that abstracts away node infrastructure.
Side effects
- Invalid Ethereum address format for owner or token_address — returns validation error
- Token contract address is not an ERC-20 contract — may return zero balance or error
- Wallet has no balance for the token — returns balance_atomic: '0' (not an error)
- Network congestion or RPC unavailability — may result in timeout or 5xx response
- Payment not completed (x402 protocol) — request blocked until 0.01 USDC fee is paid
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| token_address | string |
Output
Schema · Response
{
"type": "json",
"example": {
"symbol": "USDC",
"decimals": 6,
"block_number": 12345678,
"balance_atomic": "0"
}
}Tags
x402
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