Four trading days. Four afternoons where SPX found a level and sat on it. Net for the week: +$1,819.
The number isn’t the interesting part. The interesting part is why it’s that big. This bot has no profit target and no stop loss — it sells the 2:00 PM ATM straddle, buys $40 wings, and holds to 3:59 PM no matter what the tape does in between. That missing exit button is the same feature that cost it −$2,050 on a single afternoon two weeks earlier, when SPX trended into the close and ran straight through the body . Same design. Opposite result.
Because in a week where nothing moves, having no exit is the whole edge. There’s no 35% target to take the money early and walk. The fly just sits there and collects the entire straddle decay, all the way to the bell. The 9:32 AM Iron Condor lived through this exact same calm week and made +$1,216 — a clean, capped, four-for-four week. The fly made fifty percent more on the same market, on the same four days, for one reason: it never took an early exit, so it kept everything the calm afternoons gave back.
Here’s how the four days ran.
⚙️ The Setup
Skip this if you’ve read prior posts on this bot. Enter at 2:00 PM on SPX, sell the at-the-money straddle, buy $40 wings on each side for defined risk. No profit target. No stop loss. The only exit is the 3:59 PM bell. You’re fully committed to wherever the index decides to close — that’s the whole philosophy , and it’s both the strength and the liability.
When SPX pins near the short strikes at the close, you collect almost the full credit. When it drifts 15–20 points away, you give a chunk back. This week, it pinned. Every day.
The Week at a Glance
| Date | Entry SPX | Exit SPX | Credit | Debit | Exit Reason | P&L |
|---|---|---|---|---|---|---|
| Tue 5/26 | $7,507.94 | $7,518.53 | $12.55 | $9.70 | Time Limit | +$285 |
| Wed 5/27 | $7,514.42 | $7,521.47 | $11.70 | $5.68 | Time Limit | +$602 |
| Thu 5/28 | $7,564.06 | $7,564.39 | $8.50 | $1.40 | Time Limit | +$710 |
| Fri 5/29 | $7,569.73 | $7,576.35 | $16.82 | $14.60 | Manual Stop | +$222 |
| Net | +$1,819 |
Four greens. SPX traveled 68 points across the whole week, almost all of it overnight gaps between sessions — the intraday afternoon moves the bot actually cares about were tiny. The biggest 2-to-close drift was 10.6 points on Tuesday. The smallest was a third of a point.
Day by Day
Tuesday, May 26 — the loose pin. Entry at $7,507.94, body at 7510. SPX drifted up about 10 points and closed near 7518 — eight points above the short call, so the fly only captured part of the decay. Credit $12.55 in, $9.70 out. +$285 (22.7%). The least efficient day of the four, and still green.
Wednesday, May 27 — the grind tighter. Body at 7515, SPX closed at 7521.47, a 7-point drift. The straddle decayed from $11.70 to $5.68 as the afternoon wore on. +$602 (51.5%).
Thursday, May 28 — the textbook pin. This is the one the strategy is built to catch. Entry at $7,564.06, body at 7565. SPX moved 0.3 points in two hours and closed at 7564.39 — a near-perfect pin on the short strikes. Implied vol was already on the floor at 9.3%, so the credit was thin ($8.50), but it almost didn’t matter: the debit to close collapsed to $1.40. That’s an 83.5% capture of the straddle. +$710 — the best day of the week, on the smallest move of the week. When the index parks itself on your body and time does the rest, this is what the no-stop hold delivers.
Friday, May 29 — the early exit. The asterisk. Body at 7570, and the credit jumped to $16.82 — implied vol spiked back to 18.9%, the market pricing in more movement heading into the weekend. But this trade didn’t ride to the bell. It closed at 2:54 PM, 54 minutes in, for +$222 (13.2%) — a manual stop, the one day the bot didn’t follow its own rule to the close. SPX was sitting six points above the body and the position was modestly green; the trade got booked early rather than held through the last 65 minutes of decay. It left money on the table by the bot’s own logic. On any other afternoon that’s a footnote, but in a week defined by holding everything, the one day it didn’t is worth flagging.
The Pattern: The Same Design, Read Backwards
Look at the credit column against the implied vol. Tuesday the body priced at 13.6% vol, Wednesday 12.7%, Thursday a remarkable 9.3% — the market kept lowering its estimate of how much SPX would move, and kept being right. Thin credits, but thin debits to close, because the index never went anywhere. The whole week was the market and the bot agreeing that nothing would happen, and nothing did.
That’s the exact mirror of the trade that defines this bot’s downside. On a trend afternoon, the missing stop loss means a manageable loss becomes a −$2,050 one, because there’s no brake — the position rides the full move into the close. This week, the missing stop loss means a good position becomes a great one, because there’s no early exit — it rides the full decay into the close. Same mechanism. The market just pointed it the other way.
The contrast with the morning condor makes it concrete. That bot took its 35% profit and walked four times for +$1,216 . Disciplined, capped, done by noon. The fly held every position to the bell and banked +$1,819 on the same calm tape. In a pinning week, the capped design leaves the back half of the decay on the table and the no-stop design collects it. Thursday alone — that 83.5% capture — is the difference. The fly was allowed to keep grinding to $1.40; a 35% rule would have closed it hours earlier at a fraction of that.
None of this means the fly is the better bot. It means the two designs get paid in different weather. The condor’s stop loss is what keeps a May 19 from becoming a five-figure hole. The fly’s lack of one is what turns a dead-flat week into +$1,819. You don’t get to pick the weather.
The Edge Is in Letting the Calm Days Run
It’s tempting to look at four greens and a +83.5% pin and conclude the no-stop fly is the strategy to run. It’s the same mistake as looking at the −$2,050 day and concluding it’s broken. Both weeks were the identical bot following the identical rule. One afternoon the market trended and the rule cost a fortune. Four afternoons it pinned and the rule paid for it.
The arrangement is honest about itself: you remove the exit button, and in exchange you accept the full distribution. The tail days take a chunk. The calm days hand you the whole credit. Over a large enough sample, the calm days are more common than the tail days — that’s the entire bet. This week was four of the common kind in a row, and the bot did the one thing it’s built to do with them: nothing, all the way to 3:59.
It’ll be back at 2:00 PM Monday, selling the straddle, holding to the close. Some weeks the market parks itself on the body. Some weeks it runs. The edge isn’t in this week’s four pins. It’s in sitting still for the next thousand afternoons.
Related Articles
- Four Days of the 2 PM Iron Fly: A Week Without an Exit Button — the same bot’s prior multi-day log, a mixed +$1,417 week where two pins paid for two drift-day losses.
- Paying Out an Insurance Claim (0DTE SPX Iron Fly) — same bot, the −$2,050 trend day. The exact mirror of this week: no exit button, pointed the wrong way.
- The Boring Week That Pays for the Brutal One: +$1,216 Across Four 9:32 Condors — the same calm week through a capped-profit bot. The head-to-head that explains why the fly out-earned it.
Disclaimer: This log is for educational purposes only. 0DTE options carry significant risk. All trades described here ran in paper-monitoring mode. Always trade within your risk tolerance.