Trade Rail: refuse trades you cannot exit

A free quote API for trading bots and agents on Arc, X1 and BNB Chain. Before you buy, we simulate buying and selling back at your size on the latest block. A token you could not sell, or whose round trip costs more than your limit (15% at most), is refused. Otherwise you get the real pool and unsigned transactions for your own wallet. We never hold a key or your money; your wallet signs and broadcasts.

Refused in the last 7 days

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One call

GET https://apexfaucet.xyz/api/rail/quote
  ?chain=arc|x1|bnb
  &token=<token address>
  &side=buy|sell
  &amount=<buy: USDC on Arc, XNT on X1, BNB on BNB · sell: tokens>
  &from=<your wallet>        (needed for the transaction and for sells)
  &slippage=0.03            (optional)
  &maxLossPct=15            (optional, 0.5 to 15)

Reply: ok, refused with the reason, check (buy works, sell works, round-trip loss in % at your size), expectedOut, minimumOut and txs: unsigned transactions to sign in order. Free up to 2,000 quotes a day per program. Also in our MCP server as trade_rail_quote (POST https://apexfaucet.xyz/api/mcp).

What it covers

chain	venues	the check	fee
Arc	every pool in our index of 246,000 Uniswap v4 pools, Argus launchpad included	buy then sell, simulated through the pool's hook	none this week
BNB	PancakeSwap V2, four.meme bonding curves	buy and approve, then sell all in the next block (same-block sells are blocked by many anti-bot rules)	none this week
X1	XDEX and the APEX AMM, best of 3 routes	price impact, and the transaction simulated against your wallet	the router's platform fee, inside the transaction and shown in the quote

What it cannot see: a token that blocks sells later, blacklists a wallet after you buy, or changes its tax afterwards. The verdict holds at check time.

Refused trades, live

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The full list: /api/rail/refusals · counts: /api/rail/stats. Who asked is never recorded.

Rules we hold ourselves to

We never trade ahead of a quote you ask for, never use your quotes or intents for our own trades, and our own traders cannot read this log. Software only: no custody, no orders placed for you, no recommendation of any token. Nothing here is advice; prices move.