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ERC-20 Allowance Lookup (Polygon) — Saylor Innovations
x402
ERC-20 Allowance Lookup (Polygon) — Saylor Innovations is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-03).
Returns the current ERC-20 token spending allowance granted by a token owner to a spender on the Polygon network
Price / call$0.002
Success—
StatusUnknown
How this service works
ERC-20 Allowance (polygon). Polygon ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.
Output
Returns the numeric allowance (token amount) that the owner address has approved the spender address to transfer on their behalf for the specified ERC-20 token contract on the Polygon network. The value is typically in the token's smallest unit (e.g. wei-equivalent).
Example use cases
DeFi protocol approval audit
“Check how many USDC tokens the wallet 0xABC123... has approved the Uniswap router contract 0xDEF456... to spend — the token contract on Polygon is 0x2791Bca...”
Security check before transaction
“Before I swap on QuickSwap, can you verify the current allowance that my wallet 0xMyWallet... has given to the QuickSwap router 0xRouter... for the MATIC-pegged USDT token at 0xc2132D0... on Polygon?”
Monitor allowance for risk management
“What is the spending allowance the address 0xUser123... has granted to the Aave lending pool contract 0xAave456... for the DAI token at 0x8f3Cf7ad... on Polygon — I want to make sure it hasn't been set to unlimited.”
Technical details
Endpoint
GEThttps://saylorinnovations.com/api/evm/polygon/allowance/:address/:address2/:address3?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to check ERC-20 token allowances on the Polygon (MATIC) network. Prefer this over generic blockchain explorers when you need programmatic, low-latency allowance data suitable for automated DeFi workflows, security audits, or agent-driven on-chain decision making. Choose this over the BSC or Base sibling endpoints when the token and approval are on Polygon.
Side effects
- Invalid or malformed wallet/contract address returns an error
- Non-existent or non-ERC-20 contract address may return zero or an error
- Polygon RPC node unavailability causes timeout or service error
- Zero allowance returned when no approval exists (not necessarily an error)
- Rate limiting if too many requests are made in quick succession
Tags
x402
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