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EVM Chain Read – ERC-20 Allowance
x402
EVM Chain Read – ERC-20 Allowance is a paid API for AI agents from chain-read.frcompanycheck.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).
Returns the ERC-20 token allowance that a spender is approved to transfer on behalf of an owner, on Base or Robinhood Chain, paid per-call via x402 USDC.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call EVM reads on Base (8453) and Robinhood Chain (4663): native balance, block tip, ERC-20 meta/balance/allowance, is-contract. Public RPCs, no API key. x402 USDC on Base.
Output
A JSON object with a single field `allowance` containing the uint256 integer representing the number of token units the spender is authorized to transfer on behalf of the owner. A value of 0 means no approval exists.
Example use cases
Pre-flight DeFi approval check
“Before I execute a swap on Uniswap on Base, can you check whether my wallet 0xMyWallet has approved the Uniswap v3 router 0xE592427A to spend my USDC token 0xA0b86991 — and how much is approved?”
Automated allowance monitoring for a bot
“Every time my trading bot is about to submit a transaction on Base (chain 8453), check the current allowance of token 0xTokenAddr from owner 0xBotWallet to spender 0xProtocol so it knows whether to send an approve tx first.”
Security audit of wallet approvals
“For my wallet 0xAuditedWallet on Robinhood Chain (4663), look up how many tokens at contract 0xSomeToken I've approved the contract 0xSuspiciousSpender to spend — I want to know if I need to revoke it.”
Technical details
Endpoint
GEThttps://chain-read.frcompanycheck.workers.dev/v1/%7Bchain%7D/erc20/allowance/%7Btoken%7D/%7Bowner%7D/%7Bspender%7D?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call ERC-20 allowance read on Base or Robinhood Chain without managing your own RPC infrastructure or API keys. It is ideal for AI agents that need on-demand blockchain state reads priced at $0.002 USDC per call, especially when integrating DeFi workflows that require approval checks before swap or transfer transactions.
Side effects
- Invalid or non-checksummed address returns an error or zero allowance
- Unsupported chain ID returns a routing error
- Non-ERC-20 contract address (e.g. an EOA or non-standard contract) may return 0 or an RPC error
- x402 payment failure (insufficient USDC balance or misconfigured payment header) results in 402 response blocking the read
- Network/RPC congestion on the underlying public node may cause timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"allowance": 0
}
}Tags
x402
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