# Stock Bill Economy: Buy Out Every Weekly Artificing Catalyst

> Complete breakdown of Arknights Endfield's weekly Artificing Catalyst shop costs. Learn passive income targets, delivery optimization.

Source: https://endfieldhub.org/blog/stock-bill-economy-weekly-artificing-catalyst-guide
Published: 2026-04-27
Updated: 2026-09-24

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## TL;DR - Key Points

* **14,400,000 Stock Bills** — total weekly cost to clear all Artificing Catalyst tiers from the shop
* **Passive income covers 58%** — maxed outposts + monitoring terminals generate \~7,789,824 bills/week
* **Deliveries are the swing factor** — Wuling transfers can add \~2,940,000 bills, cutting your trading requirement in half
* **Elastic trading fills the gap** — 875 units/week at \~$1,115 profit each with deliveries, or \~$3,338 without
* **Laziness threshold exists** — skipping the 75% tier catalysts lets you clear the rest with passive income alone

> **Spend those bills wisely:** [Use the Artificing Planner](https://endfieldhub.org/tools/artificing-planner) to find the cheapest T4 fodder for every substat upgrade. It ranks 167 T4 pieces by craft cost (Wuling Stock Bills + Xiranite/Cuprium/Hetonite Component), now including the [23 new Wuling gears](https://endfieldhub.org/blog/23-new-artificing-gears-wuling-aic-fieldwork), so you stretch each catalyst purchase as far as possible.

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## The Goal: 14,400,000 Stock Bills

To completely clear the weekly catalyst stock, you need a massive pile of bills. Here is the cost breakdown per tier:

| Tier            | Stock   | Unit Cost | Total          |
| --------------- | ------- | --------- | -------------- |
| \-95% Catalysts | 40      | $60,000   | 2,400,000      |
| \-90% Catalysts | 20      | $120,000  | 2,400,000      |
| \-85% Catalysts | 20      | $180,000  | 3,600,000      |
| \-75% Catalysts | 20      | $300,000  | 6,000,000      |
| **Total**       | **100** | —         | **14,400,000** |

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## Maximizing Passive Income (Outposts & Monitoring)

To hit this target, you need to optimize your production bonuses. Clear outpost defenses and assign the right operators — look for those 20% stock bill bonuses.

### Outpost Generation

With a maxed-out outpost and a 20% bonus operator assigned, plus the **15% risk level 3 defense bonus** for Sky King Flats, your passive income looks like this:

| Source         | Calculation                 | Weekly Total  |
| -------------- | --------------------------- | ------------- |
| Sky King Flats | 26,880/hr × 24h × 7d × 1.35 | **6,096,384** |
| Marker Stone   | 8,400/hr × 24h × 7d × 1.20  | **1,693,440** |

**Combined outpost income: 7,789,824 bills/week**

### Monitoring Terminals

Jobs that refresh every two days are essential. Ensure your terminals are maxed to get these high-tier rewards:

| Terminal     | Per Job | Jobs/Week | Weekly Total  |
| ------------ | ------- | --------- | ------------- |
| Outskirts    | 450,000 | 3.5       | **1,575,000** |
| Marker Stone | 320,000 | 3.5       | **1,120,000** |

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## Active Income: Deliveries

Deliveries are the “swing” factor. If you are diligent with refreshing for Wuling deliveries, the pressure on your stock trading drops significantly.

| Delivery Type      | Per Run     | Frequency | Weekly Total |
| ------------------ | ----------- | --------- | ------------ |
| Transferred Wuling | 100,000 avg | 3 daily   | 2,100,000    |
| Local Delivery     | 120,000     | 1 daily   | 840,000      |

**Weekly delivery total: (300,000 + 120,000) × 7 = 2,940,000 bills**

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## The Shortfall: Elastic Stock Trading

Adding up all the “easy” sources (Outposts + Monitoring + Deliveries):

| Source     | Weekly Income  |
| ---------- | -------------- |
| Outposts   | 7,789,824      |
| Monitoring | 2,695,000      |
| Deliveries | 2,940,000      |
| **Total**  | **13,424,824** |

This leaves a **gap of \~975,176 bills** to reach the 14.4 million goal. This is where **Elastic Goods Trading** comes in. With maxed Stock Redistribution terminals, you can purchase **875 items weekly** (125/day).

### Scenario A: The Dedicated Courier

If you do all your Wuling deliveries, you only need a profit of about **$1,115 per unit** in stock trading. This is incredibly easy — basically any decent buy-low-sell-high move will cover it.

### Scenario B: The Delivery Slacker

If you find refreshing for Wuling deliveries annoying and only do your **local delivery**, your weekly income drops significantly. In this case, you need to make up roughly **$3,000,000+** in the stock market.

* **Required profit per unit:** \~$3,338
* **Strategy:** Be more selective. Look for items priced under 1k and hold them until they hit 4.3k+. It is high, but definitely possible if you check the market daily.

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## Final Strategy for Artificing

Is it worth it? If you are not doing 100 gear artificing attempts per week, you likely do not need to clear the shop. However, if you are min-maxing your main team’s gear to 9/9, you will burn through these fast.

**The “Laziness” Threshold:**

If you completely ignore the **75% Tier Catalysts** (the most expensive ones at 6,000,000 bills), you can easily clear the rest of the shop using only outpost income and monitoring jobs — no trading or annoying deliveries required.

But for those of us who want it all: assign your 20% bonus operators, clear your Level 3 defenses, and keep an eye on those elastic stock margins. Your gear will thank you.