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ERC-20 Allowance Lookup (BSC)
x402
ERC-20 Allowance Lookup (BSC) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).
Returns the ERC-20 token spending allowance granted by one address to a spender on Binance Smart Chain (BSC)
Price / call$0.002
Success—
StatusUnknown
How this service works
ERC-20 Allowance (bsc). BNB Chain (BSC) BEP-20 token allowance: how much a spender contract (router, bridge, DEX) may move from an owner wallet, in raw and decimal units, with an unlimited-approval risk flag. Use it to audit approvals before or after interacting with a contract.
Output
Returns the on-chain ERC-20 allowance (spending limit) in token units that an owner address has approved for a specific spender address on the BSC network for a given token contract.
Example use cases
Audit DeFi token approvals on BSC
“I want to check how much of my BNB-BUSD LP token (contract 0x58F876857a02D6762E0101bb5C46A8c1ED44Dc16) I've approved the PancakeSwap MasterChef contract (0x73feaa1eE314F8c655E354234017bE2193C9E24E) to spend from my wallet 0xDEAD...BEEF — can you fetch that allowance on BSC?”
Pre-trade approval check for a bot
“Before my trading bot submits a swap on BSC, check whether the token contract 0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d has enough allowance granted to the router 0x10ED43C718714eb63d5aA57B78B54704E256024E from address 0x1234...5678 so we don't waste gas on a failed transaction.”
Security review of wallet spending permissions
“I'm doing a security audit — can you look up the ERC-20 allowance that my wallet 0xAAAA...BBBB has given to the contract 0xCCCC...DDDD for the token at 0xEEEE...FFFF on Binance Smart Chain, so I can see if it needs to be revoked?”
Technical details
Endpoint
GEThttps://saylorinnovations.com/api/evm/bsc/allowance/:address/:address2/:address3?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to check ERC-20/BEP-20 token spending approvals specifically on Binance Smart Chain (BSC). Prefer it over generic blockchain RPC calls when you want a simple REST interface without managing RPC nodes. Choose the Arbitrum sibling endpoint instead if your token and addresses are on Arbitrum. Ideal for DeFi automation agents that need to verify approvals before submitting swaps or for security tools auditing wallet permissions.
Side effects
- Invalid or malformed wallet/contract address returns an error or zero result
- Contract address is not an ERC-20 token — call may revert or return unexpected data
- BSC RPC node unavailable or rate-limited — timeout or 5xx error
- Address has no allowance set — returns zero (not an error, but may be misinterpreted)
- Incorrect address ordering (owner vs spender swapped) leads to misleading zero result
Tags
x402
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