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Token Preflight
x402
Token Preflight is a paid API for AI agents from seenly-token-preflight.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Runs a pre-trade safety check on a Base ERC-20 token, simulating buys/sells, analyzing taxes, owner powers, liquidity, LP, holders, and verification, then returns a shareable verdict card.
Price / call$0.02
Success—
StatusUnknown
How this service works
Token Preflight: pre-trade safety check for a Base ERC-20 (buy/sell simulation, taxes, owner powers, liquidity, LP, holders, verification) with a shareable verdict card. Not investment advice.
Output
Returns a structured verdict card summarizing buy/sell simulation outcomes, detected tax rates, owner privilege flags (mint, blacklist, pause), liquidity depth, LP lock status, top holder concentration, and contract verification status. In 'full' mode, also includes raw on-chain evidence supporting each check.
Example use cases
Memecoin rug pull check
“Can you check if the Base token at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is safe? Simulate a $100 buy/sell and flag any honeypot or owner danger signs.”
DeFi bot pre-trade gate
“Before my bot executes a $5000 trade on Base token 0x4200000000000000000000000000000000000006, run a preflight safety check and only proceed if the verdict card comes back clean.”
Token launch due diligence
“I'm researching a new Base token at 0x2Ae3F1Ec7F1F5012CFEab0185bfc7aa3cf0DEc22 — give me the full preflight analysis with raw evidence so I can see liquidity, taxes, holder concentration, and whether the contract is verified.”
Technical details
Endpoint
GEThttps://seenly-token-preflight.vercel.app/api/token-preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, structured pre-trade safety assessment for any ERC-20 token on Base mainnet before executing a swap or recommending a token to a user. It is specifically designed for Base chain and combines simulation, tax detection, and ownership analysis in a single call — prefer it over generic blockchain explorers or manual contract reads when you need an actionable verdict quickly and cheaply at $0.02 per call.
Side effects
- Invalid or non-ERC-20 token address returns an error
- Token not deployed on Base mainnet (only Base/chain id 8453 supported)
- Token with no liquidity may cause simulation failure
- Contract not verified may limit some analysis depth
- Trade size outside $1–$100,000 range rejected
- Network or RPC errors may cause timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mode | string | card = verdict + compact checks; full = adds raw evidence. |
| chain | string | Only Base mainnet (chain id 8453) in v1. |
| sizeUsd | number | Simulated trade size in USD. |
| requestKey | string | Optional idempotency key, echoed back. |
| tokenAddress | string | ERC-20 token contract address on Base. |
Output
Schema · Response
{
"type": "json",
"example": {
"grade": "OK",
"score": 80,
"checks": [
{
"id": "trade_simulation",
"label": "buy and sell simulate successfully",
"status": "pass"
}
],
"verdict": "OK (80/100) for DEGEN. Risk signals: top-10 holders own 61.8%; privileged functions: pause function. Simulated buy/sell OK (tax 0%/0%).",
"card_url": "https://seenly-token-preflight.vercel.app/c/<signed>",
"one_liner": "DEGEN on Base: OK 80/100. Top-10 holders own 61.8%; liquidity $614.0k.",
"disclaimer": "Not investment advice. ...",
"as_of_block": "52088888"
}
}Tags
x402
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