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Base Pre-Trade Sellability Check Batch
x402
Base Pre-Trade Sellability Check Batch is a paid API for AI agents from api.x402risk.com, paid per call via x402, $0.15/call, status unknown (last checked 2026-10-02).
Batch-simulates buy, transfer, and sell transactions for up to 10 Base ERC-20 tokens to detect honeypots, high tax traps, and liquidity issues before trading.
Price / call$0.15
Success—
StatusUnknown
How this service works
Pay-per-call token risk check for Base: send a Base ERC-20 contract address, get deterministic JSON risk flags (owner/renounced, upgradeable proxy, mint/pause/blacklist/fee functions, on-chain Uniswap v2/v3 + Aerodrome liquidity, holder concentration) and a rule-based risk_level. Use before buying or listing an unfamiliar Base token. $0.01 USDC. Invalid input returns 400 and is not charged. Not financial advice. Also: POST /v1/pretrade-check ($0.02) pre-trade sellability / honeypot simulation; POST /v1/address-screen ($0.005) pay-to address screen (OFAC SDN exact match, lookalike). Contact: agent-4610161f6fd5c36a@agentmail.to
Output
Returns a JSON object with a results array (one entry per token) containing: simulation verdict (ok/warn/fail), buy_ok/sell_ok/transfer_ok booleans, buy/sell/transfer tax percentages, estimated gas costs, pool address used, DEX route, block number of simulation, risk flags with notes, revert reason if applicable, and a disclaimer. Also includes top-level count and disclaimer fields.
Example use cases
Rug-pull screen before memecoin buy
“I'm about to ape into three new Base memecoins — 0x532f27101965dd16442E59d40670FaF5eBB142E4, 0xabc1230000000000000000000000000000000001, and 0xdef4560000000000000000000000000000000002. Can you simulate a $100 buy and sell on each using auto router to check if any are honeypots or have crazy taxes?”
DEX listing safety audit for new tokens
“We're about to list these 5 Base tokens on our platform: 0x532f27101965dd16442E59d40670FaF5eBB142E4, 0xBA3F945812a83471d709BCe9C3CA699A19FB46f7, 0xaaa1110000000000000000000000000000000003, 0xbbb2220000000000000000000000000000000004, 0xccc3330000000000000000000000000000000005. Run a $500 pre-trade sellability simulation on each via Uniswap v3 so I know which ones are safe to list.”
Portfolio token sellability verification
“I hold positions in these two Base tokens and I'm worried I might not be able to sell — 0x532f27101965dd16442E59d40670FaF5eBB142E4 and 0xBA3F945812a83471d709BCe9C3CA699A19FB46f7. Simulate a $1000 sell for each using auto router and tell me the sell tax and whether the transactions revert.”
Technical details
Endpoint
POSThttps://api.x402risk.com/v1/pretrade-check/batch?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to check multiple Base tokens in a single paid call (up to 10 per request), making it more cost-efficient than individual pre-trade checks. Choose this over the single-token endpoint when screening a batch of new tokens before listing, buying, or portfolio review. Prefer over the basic token risk check (/v1/token-check) when you specifically need transaction simulation (honeypot detection, tax measurement) rather than static contract analysis.
Side effects
- 400 error with no charge if a token address is invalid or not an ERC-20 on Base
- Simulation may fail if token has no supported liquidity pool (no WETH/USDC pair on Uniswap v2/v3 or Aerodrome)
- False negatives possible — token owner can change rules after simulation block
- Honeypot heuristics may produce false positives on complex but legitimate tokens
- Payment of $0.15 USDC required per batch call; missing or failed payment returns 402
- Rate limiting or service unavailability returns 5xx errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| router | string | Restrict the simulated pool type; auto = deepest supported WETH/USDC pool |
| tokens | array | |
| amount_usd | number | Hypothetical trade size in USD (capped to 5% of the pool's quote reserve) |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 1,
"results": [
{
"gas": {
"buy": 150000,
"sell": 133537,
"transfer": 40000
},
"pool": "0xBA3F945812a83471d709BCe9C3CA699A19FB46f7",
"chain": "base",
"route": "uniswap_v3:fee_10000 WETH",
"token": "0x532f27101965dd16442E59d40670FaF5eBB142E4",
"buy_ok": true,
"cached": false,
"status": "ok",
"product": "pretrade-check",
"reasons": [
"buy, transfer and sell simulated successfully with < 1% tax"
],
"sell_ok": true,
"verdict": "ok",
"chain_id": 8453,
"disclaimer": "Informational, not financial advice. Simulation of a hypothetical buy/transfer/sell against public Base state at the stated block; it is not a guarantee that a real trade will succeed or be taxed the same way (token owners can change rules at any time). Heuristic flags can be wrong; do your own research.",
"risk_flags": [
{
"flag": "HAS_ACTIVE_OWNER",
"note": "contract has an active (non-renounced) owner"
}
],
"buy_tax_pct": 0,
"transfer_ok": true,
"block_number": 35000000,
"sell_tax_pct": 0,
"revert_reason": null,
"schema_version": "1.0",
"transfer_tax_pct": 0,
"token_check_risk_level": "low"
}
],
"disclaimer": "Informational, not financial advice. Simulation of a hypothetical buy/transfer/sell against public Base state at the stated block; it is not a guarantee that a real trade will succeed or be taxed the same way (token owners can change rules at any time). Heuristic flags can be wrong; do your own research."
}
}Tags
x402
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