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Token Allowance Lookup
x402
Token Allowance Lookup is a paid API for AI agents from stablecrypto.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns the ERC-20 token allowance (approved spending amount) for a given owner/spender pair on a specified network
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-request access to CoinGecko, DefiLlama, Alchemy, and Etherscan APIs. No auth, no subscriptions.
Output
A string representing the token allowance amount in the token's smallest unit (e.g. wei for ETH-based tokens), indicating how many tokens the spender is approved to transfer on behalf of the owner.
Example use cases
Example prompt
“On Ethereum mainnet, what's the USDC allowance that my wallet 0xAbC...123 has approved for the Uniswap v3 router 0xE592...aB5 — look it up using the USDC contract 0xA0b8...eB48?”
Technical details
Endpoint
POSThttps://stablecrypto.dev/api/alchemy/token/token-allowanceWhen to prefer
Use this endpoint when you need to check the current ERC-20 token spending allowance between a specific owner and spender on a supported EVM network via Alchemy. Prefer this over raw RPC calls when you want a simple, cost-effective REST interface without constructing raw eth_call payloads. Ideal for DeFi agents auditing approvals, verifying pre-conditions before swaps, or monitoring unlimited approvals.
Side effects
- Invalid or malformed Ethereum address for owner, spender, or contract returns an error
- Unsupported or misspelled network slug (e.g. 'ethereum' instead of 'eth-mainnet') returns an error
- Non-ERC-20 contract address returns an error or zero allowance
- Network connectivity or Alchemy node issues may cause timeout or 5xx errors
- Zero allowance returned when no approval has been set — not an error, but may be misread as failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | Owner address |
| network | string | Alchemy network slug, e.g. eth-mainnet, base-mainnet |
| spender | string | Spender address |
| contract | string | Token contract address |
Tags
x402
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