Ponsfamily launches on Robinhood Chain (4663) are not a generic Uniswap listen-and-buy. V1 and V2 use different venues, different clocks, and different “first is last” rules. Most failed bots die on those rules, not on gas.
Here are the problems that matter.
1. Two protocols, one listener
V1 seeds a Uniswap V3 pool and blocks ordinary buys in launch block N. Caps still apply in N+1 and N+2. V2 opens a bonding curve with a buy tax that starts near 99% and decays to ~0% in about five seconds, then graduates into a locked V4 pool.
Fix: treat detection as one pipeline and execution as two strategies. Parse factory logs for both generations. Route by factory address, not by UI labels. Never reuse a V3 swap path on a V2 curve quote.
2. Being first on V2 is usually the worst fill
A t=0 buy keeps ~1% of size after tax. Waiting ~2–2.5s often keeps ~95–99% of size. A bot that “wins the block” can lose 50–100x tokens versus a delayed entry unless the curve graduates in seconds (rare at meaningful size).
Fix: quote tax + curve price together. Gate entries on MAX_ENTRY_SNIPE_TAX_BPS and a minimum delay. Exempt wallets (creator-named at creation) are a separate path — verify the live recipient exemption on-chain before sending, every time. Exemptions are fixed at launch and cannot be added later.
3. V1 restriction math is supply-relative
Same-block snipes fail. After that, per-wallet and cumulative buy caps (commonly ~5% / ~5.5% of supply) still reject oversized or stacked wallets.
Fix: size each wallet as if sibling wallets already filled ahead of it. Target N+1, retry failures around N+2, then fall back after the window. Cap attempts; do not hammer the same wallet into MaxTxExceeded.
4. RPC bursts invent their own failures
Twenty wallets, one log, one unbounded Promise.all = nonce collisions, stale quotes, and a self-DDoS of your provider.
Fix: batch entries. Requote V2 between batches. Randomize size and delay. Sequential sells beat simultaneous dumps into the same thin curve.
5. Screening is not optional
A launch can exist on-chain before any page or chart renders it. That is the point of a sniper — and also how you buy a token with no sell path, sticky tax, or unrenounced controls.
Fix: before spend, read ownership, tax, and a simulated sell. Fail closed. Pre-sign only after checks pass. Report fill, route, price, and a Robinscan link in one place so you can audit the next miss.
What to build first
- Log listener on both factories.
- Classifier: V1 pool vs V2 curve vs graduation.
- Tax/restriction-aware quoter.
- Batched multi-wallet executor with independent exits.
Speed is cheap. Correct venue + correct clock is the product.
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