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LogicNodes EVM Token Allowance
x402
LogicNodes EVM Token Allowance is a paid API for AI agents from logicnodes.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Queries the ERC-20 token allowance granted by an owner address to a spender address on any supported EVM chain at a specified block
Price / call$0.002
Success—
StatusUnknown
How this service works
Exact answers for AI agents: 40+ tools for EVM chains and Aptos, gas on 14 chains, never a guess. Free tier; pay per call in USDC (x402) on 13 networks.
Output
Returns a JSON object with ok: true, the tool name 'evm_allowance', and the numeric allowance amount the spender is permitted to transfer on behalf of the owner for the specified ERC-20 token, as read at the requested block on the specified EVM chain.
Example use cases
Pre-swap approval check in DeFi bot
“Before I submit a swap on Uniswap on Base, check whether my wallet 0xABCD...1234 has already approved the Uniswap v3 router 0xE592...4bE8 to spend my USDC token at 0xA0b8...eB48 — use chain eip155:8453 and the latest block.”
Historical allowance audit at specific block
“What was the WETH allowance that 0xDead...Beef granted to the Aave lending pool 0x87870...4bb0 on Ethereum mainnet (eip155:1) at block 19500000? I need the exact figure from that block.”
Security check for suspicious approvals
“I'm worried about a phishing approval — can you look up how much of my DAI token at 0x6B17...4D6E the suspicious contract 0xBaD0...0001 is allowed to spend from my address 0xMy...Wallet on Polygon (eip155:137) at the finalized block?”
Technical details
Endpoint
POSThttps://logicnodes.io/paid/v1/tools/evm_allowance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need an exact, on-chain ERC-20 allowance value for a specific owner/spender/token triple on an EVM chain. Prefer it over general RPC calls or blockchain explorers when you need a structured, agent-friendly JSON response with CAIP-2 chain support, historical block queries, and pay-per-call pricing with no API key setup. It is especially useful in DeFi automation workflows where you need to verify approvals before executing transactions.
Side effects
- Invalid or non-checksummed address returns a validation error
- Chain name strings (e.g. 'base') rejected — must use CAIP-2 format like eip155:8453
- Unsupported chain ID returns an error
- Non-existent or non-ERC-20 token contract may return zero or error
- Block number beyond chain tip returns an error
- Malformed owner/spender/token hex addresses rejected
- Payment failure (x402) results in 402 response before tool execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| block | string | "latest" (default), "safe", "finalized", or a decimal block number. Every value in the answer is read at this one block |
| chain | string | EVM CAIP-2 chain id such as eip155:8453, or a bare chain id number as a string. Chain names are refused. |
| owner | string | 0x + 40 hex digits (EIP-55 checksum enforced when mixed-case) |
| token | string | 0x + 40 hex digits (EIP-55 checksum enforced when mixed-case) |
| spender | string | 0x + 40 hex digits (EIP-55 checksum enforced when mixed-case) |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "evm_allowance"
}
}Tags
x402
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