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Base Token Safety Check
x402
Base Token Safety Check is a paid API for AI agents from base-token-check.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).
Checks a Base ERC-20 token contract address and returns allow, warn, or block based on supply concentration, proxy patterns, and dangerous bytecode selectors.
Price / call$0.01
Success—
StatusUnknown
How this service works
Base ERC-20 check before an agent buys or holds a token. Input: one contract address. Output: allow, warn, or block. Block: not a contract, not an ERC-20, zero supply, or the owner or token contract holds at least 50 percent. Warn: 20 to 50 percent held, proxy (EIP-1967, EIP-1167, or implementation()), or bytecode contains mint or pause. A selector does not prove the public can call it. Concentration covers only the owner and the token contract. Not an audit.
Output
Returns a verdict of 'allow', 'warn', or 'block'. Block conditions: the address is not a contract, not an ERC-20, has zero supply, or the owner or token contract itself holds ≥50% of supply. Warn conditions: 20–50% concentration, presence of proxy patterns (EIP-1967, EIP-1167, or implementation()), or bytecode containing mint or pause selectors. Allow means none of the above triggers fired. This is a heuristic screen, not a formal audit.
Example use cases
Pre-purchase token safety screening
“Before my DeFi agent swaps into this token at 0xabc123def456abc123def456abc123def456abc1 on Base, run a safety check — tell me if it's a real ERC-20 with no dangerous concentration or suspicious bytecode.”
Portfolio risk audit for held tokens
“I'm holding a bunch of Base tokens and want to make sure none are risky — start by checking 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef for supply concentration, proxy flags, and mint or pause selectors.”
Automated agent trade guard
“My trading agent is about to execute a buy — first check 0x9999888877776666555544443333222211110000 to see if the owner or contract holds 50% or more of supply or if there's any bytecode red flag that should block the trade.”
Technical details
Endpoint
GEThttps://base-token-check.fly.dev/v1/token-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent is about to buy, swap into, or hold an ERC-20 token on the Base network and needs a lightweight pre-flight safety check. It is purpose-built for agentic trading workflows that require a fast allow/warn/block signal rather than a full audit. Prefer this over manual inspection when automating token purchases at scale or when integrating a safety gate into a DeFi agent loop. It is not a substitute for a full smart contract audit but is ideal as a fast, cheap ($0.01 USDC) first-pass filter.
Side effects
- Invalid address format (not a 0x-prefixed 40-hex-character string) causes request rejection
- Address is an EOA or non-contract — verdict is 'block' with reason not-a-contract
- Token has no detectable ERC-20 interface — verdict is 'block' with reason not-an-erc20
- Network or RPC unavailability may cause timeout or 5xx error
- Proxy contracts may obscure underlying logic — proxy warning issued but full audit not possible
- Mint/pause selector presence does not confirm public callability — may produce false-positive warns
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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