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SALT19 Base Contract State Lookup
x402
SALT19 Base Contract State Lookup is a paid API for AI agents from api.salt19.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Retrieves the base on-chain state of an Ethereum address, including whether it is a contract, its bytecode size, and current block context.
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: whether the address is a smart contract (is_contract boolean), the size of its deployed bytecode in bytes (code_bytes), the current block number (block_number), and token context including symbol (USDC) and decimals (6).
Example use cases
Verify contract vs EOA before transfer
“Before I send funds, can you check if 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 is actually a smart contract or just a regular wallet, and give me its bytecode size?”
Smart contract deployment confirmation
“I just deployed a contract — can you confirm that 0xdAC17F958D2ee523a2206206994597C13D831ec7 now shows up as a contract on-chain with bytecode, and what block number confirmed it?”
Due diligence on unknown address
“I found this address 0x6B175474E89094C44Da98b954EedeAC495271d0F in a transaction — can you pull its base contract state and tell me if it's a contract, how big its bytecode is, and the current block?”
Technical details
Endpoint
POSThttps://api.salt19.com/v1/base-contract-stateWhen to prefer
Use this endpoint when you need a fast, cheap ($0.01 USDC) on-chain lookup of an Ethereum address's base state — specifically whether it is a contract, its bytecode footprint, and the current block. Prefer this over full blockchain explorers when you only need contract/EOA classification and bytecode size without full ABI decoding, event logs, or transaction history. Ideal for agent workflows that gate logic on whether an address is a contract before taking further action.
Side effects
- Invalid address format (not a valid 0x hex address) — request rejected before on-chain query
- Address not found or network unavailable — may return is_contract false or error
- Payment failure via x402 protocol — call not processed if USDC payment of $0.01 not confirmed
- Rate limiting or quota exceeded — HTTP 429 or similar
- Node RPC failure — upstream blockchain node unavailable causing 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string |
Output
Schema · Response
{
"type": "json",
"example": {
"token": {
"symbol": "USDC",
"decimals": 6
},
"code_bytes": 1234,
"is_contract": true,
"block_number": 12345678
}
}Tags
x402
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