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ERC-20 Approval Enumerator for Base (Chain 8453)
x402
ERC-20 Approval Enumerator for Base (Chain 8453) is a paid API for AI agents from x402-research-iota.vercel.app, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-29).
Lists all live ERC-20 token approvals for a given Base network address, returning token, spender, current allowance, and whether the approval is unlimited.
Price / call$0.03
Success—
StatusUnknown
How this service works
List live ERC-20 approvals for a Base (8453) address: token, spender, current allowance, unlimited flag. status ok (complete, approvals found) / none (complete, zero active) / unknown (data incomplete; reason given; never reported as none). Pass ?address=0x... Errors: 400 invalid address; 503 indexer/RPC unavailable (not charged). Read-only; never signs.
Output
Returns a JSON object with: status ('ok' if approvals found, 'none' if zero active approvals, 'unknown' if data is incomplete), the queried address, chainId (8453), a boolean 'complete' flag, an array of approval objects each containing token address, spender address, current allowance, and an unlimited flag, a highRiskCount, coverage metadata, and an optional reason/reasons field explaining any data gaps.
Example use cases
Pre-interaction wallet security audit
“Before I interact with this DeFi protocol, can you check all the existing ERC-20 approvals for 0xDeF9876543210987654321098765432109876543 on Base and flag any unlimited allowances that could be risky?”
Detect rogue approvals after phishing
“I think my wallet might have been compromised — can you pull all live ERC-20 approvals for 0xAaA1111222233334444555566667777888899990 on Base so I can see if any unknown contracts have been granted access to my tokens?”
DeFi portfolio approval cleanup
“I want to clean up my token approvals — show me every spender that currently has an ERC-20 allowance from 0xBbB2222333344445555666677778888999900001 on Base, including which ones are set to unlimited.”
Technical details
Endpoint
GEThttps://x402-research-iota.vercel.app/api/x402/approval-enumerate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a live, read-only enumeration of all active ERC-20 approvals for a specific Base (chain 8453) wallet address, especially when assessing approval risk before DeFi interactions, auditing wallets for unlimited allowances, or checking for suspicious spenders after a potential compromise. Prefer this over generic blockchain explorers when you need structured, machine-readable approval data with explicit unlimited-flag and risk-count fields, and are willing to pay $0.03 USDC per call via x402.
Side effects
- 400 Bad Request — address parameter is missing or not a valid 0x-prefixed 40-hex-char Ethereum address
- 503 Service Unavailable — underlying indexer or RPC node is unreachable; call is not charged
- status: 'unknown' — data is incomplete; reason field explains why full coverage could not be confirmed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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