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ERC-20 Allowance Lookup on Arbitrum
x402
ERC-20 Allowance Lookup on Arbitrum is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-30).
Returns the ERC-20 token allowance granted by an owner to a spender on the Arbitrum network
Price / call$0.002
Success—
StatusUnknown
How this service works
ERC-20 Allowance (arbitrum). Arbitrum ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.
Output
Returns the numeric ERC-20 allowance (in token base units) that an owner address has approved a spender address to transfer from a given token contract on the Arbitrum network. This reflects the current on-chain state at the time of the call.
Example use cases
Pre-swap approval check on Arbitrum
“Before I submit this Arbitrum swap, check whether my wallet 0xAbc...123 has approved the Uniswap router 0xDef...456 to spend enough of the USDC token at contract 0xA0b...Ebc — tell me the current allowance.”
DeFi bot monitoring token approvals
“Check the current ERC-20 allowance that 0x111...aaa has given to the Aave lending pool 0x222...bbb for the WETH token at 0x333...ccc on Arbitrum, so I can decide whether to trigger a new approval transaction.”
Security audit of wallet approvals
“I want to audit my wallet's exposure — look up how much of the ARB token at contract 0x912C...E7 the spender contract 0xCafe...42 is allowed to pull from my address 0xBeef...99 on Arbitrum.”
Technical details
Endpoint
GEThttps://saylorinnovations.com/api/evm/arbitrum/allowance/:address/:address2/:address3?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need ERC-20 allowance data on the Arbitrum L2 network. Prefer it over generic blockchain explorers when you need a direct API response without scraping, and over Ethereum mainnet allowance checks when your token activity is on Arbitrum specifically. Ideal for pre-transaction validation in DeFi workflows, approval auditing, or monitoring bot logic running on Arbitrum.
Side effects
- Invalid Ethereum address format for any of the three address parameters returns an error
- Non-existent or non-ERC-20 contract address may return zero or cause a revert
- Arbitrum node unavailability may cause timeout or 5xx error
- Rate limiting if too many requests are made in a short period
Tags
x402
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