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Base Launch Guard – Exit Liquidity Check
x402
Base Launch Guard – Exit Liquidity Check is a paid API for AI agents from guard.facts402.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-01).
Simulates selling a Base token position and returns net USD received, price impact, sell tax, max safe exit size, and an EXIT_TRAP flag for honeypot/illiquid tokens.
Price / call$0.02
Success—
StatusUnknown
How this service works
Use when an agent holds a Base token or memecoin and needs to know if it can still sell: simulates selling your size on the deepest pool and returns net received, price impact/slippage, the largest size that exits under 3% impact, measured sell tax and an EXIT_TRAP flag (>15% impact). Priced for repeated checks. $0.02 USDC on Base; invalid input is a 400 before payment; charged only on 2xx.
Output
Returns a JSON object with: net USD received after simulating the sale, price impact percentage, sell tax percentage, the largest USD position that can exit under 3% impact, whether the trade simulation reverted, the deepest pool address and reserve size in USD, an EXIT_TRAP boolean flag (true if impact > 15%), and the block number the simulation was pinned to.
Example use cases
Memecoin exit safety check
“I'm holding about $1,000 worth of this Base memecoin at 0xabc1234567890abcdef1234567890abcdef123456 — can you simulate selling the whole position and tell me the price impact, net USD I'd get, and whether it's an exit trap?”
Pre-sell slippage monitoring for trading bot
“Every 5 minutes, check if I can exit my $5,000 position in Base token 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef with less than 3% price impact and alert me when the max safe exit size drops below my position size.”
Sell tax and liquidity scan before entry
“I'm thinking of buying into this Base token at 0x1234abcd1234abcd1234abcd1234abcd1234abcd but first simulate a $500 sell and tell me the sell tax percentage and whether the liquidity is deep enough to exit without getting trapped.”
Technical details
Endpoint
POSThttps://guard.facts402.com/v1/guard/exit?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap ($0.02) on-chain simulation of selling a specific Base token position before executing a trade, especially for memecoins and new launches where EXIT_TRAP risk is high. Prefer this over generic DEX aggregator quotes when you specifically need sell tax measurement, the EXIT_TRAP flag, and the max-safe-exit-size calculation all in one call. Best for polling in trading agents that monitor open positions.
Side effects
- Invalid token address (not a valid Base ERC-20 contract) — returns error detail
- Trade simulation reverted — trade_simulation_reverted flag set to true, net values may be null
- Token has no liquidity pool on Base — pool data absent, cannot simulate
- Position size too large or too small (outside 1–10,000,000 USD range) — validation error
- Network or RPC failure — 500 error with no simulation data
- Both position_usd and amount_tokens provided — ambiguous input may cause error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | Base mainnet (chain id 8453) ERC-20 token contract address |
| position_usd | number | Position size in USD for the exit-liquidity simulation (default 500) |
| amount_tokens | string | Token amount in RAW units (the token's smallest unit, i.e. amount * 10^decimals) as a decimal string |
Output
Schema · Response
{
"type": "json",
"example": {
"exit": {
"data": {
"pool": {
"fee": 3000,
"kind": "uniswap_v3",
"stable": null,
"address": "0xc9034c3e7f58003e6ae0c8438e7c8f4598d5acaa",
"quote_token": "0x4200000000000000000000000000000000000006",
"quote_reserve_usd": 119650.42
},
"untaxed": false,
"exit_trap": false,
"sims_used": 4,
"position_usd": 2500,
"amount_tokens": "574780000000000000000000",
"net_received_usd": 2434.92,
"price_impact_pct": 2.31,
"net_received_quote": "216250000000000000",
"trade_simulation_reverted": false,
"max_position_usd_for_3pct_impact": 3620
},
"detail": null,
"reason": null,
"status": "ok"
},
"block": 53330000,
"chain": "base",
"token": "0x4ed4e862860bed51a9570b96d89af5e1b0efefed",
"chain_id": 8453,
"disclaimer": "Automated on-chain facts and rules-based flags. Not investment advice.",
"simulation": {
"data": {
"pool": {
"fee": 3000,
"kind": "uniswap_v3",
"stable": null,
"address": "0xc9034c3e7f58003e6ae0c8438e7c8f4598d5acaa",
"quote_token": "0x4200000000000000000000000000000000000006",
"quote_reserve_usd": 119650.42
},
"buy_ok": true,
"gas_buy": 118402,
"sell_ok": true,
"gas_sell": 126930,
"honeypot": false,
"approve_ok": true,
"buy_tax_pct": 0,
"transfer_ok": true,
"gas_transfer": 34811,
"sell_tax_pct": 0,
"content_origin": "third_party_untrusted",
"transfer_tax_pct": 0,
"revert_reason_untrusted": null
},
"detail": null,
"reason": null,
"status": "ok"
},
"data_sources": [
"Base mainnet JSON-RPC (block-pinned eth_call / eth_getCode / eth_getStorageAt, state-override trade simulation)"
],
"generated_at": "2026-10-31T12:00:00+00:00",
"position_usd": 2500,
"amount_tokens": null
}
}Tags
x402
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