WULING STOCK BILL GUIDE
Sky King Flats Trading, Environmental Monitoring & Earning Optimization
Last updated: 2026-02-09
Complete guide to earning Wuling Stock Bills in Arknights: Endfield. Covers Sky King Flats outpost unlock at Authority Level 43, Operator Liaison bonuses for extra Stock Bills, Environmental Monitoring missions for 50k+ bill windfalls, maximizing earning potential, spending priorities on Stock Redistribution exchanges and upgrades, and common mistakes to avoid.
* TL;DR - Key Points
- * Sky King Flats is the only way to earn Wuling Stock Bills -- unlocked via "Where Danger Sleeps" quest at Authority Level 43
- * Stock Bills are region-locked -- cannot convert from Valley Stock Bills or earn them in any other Wuling activity
- * All outpost trades earn Stock Bills -- no trade selection needed, every completed trade contributes
- * Operator Liaison bonuses boost income -- assign SAR Response, Turn Scrap to Treasure, Survival Knowledge operators for +1-2 Stock Bills per trade
- * Environmental Monitoring rewards 50,000+ Stock Bills -- photo-based missions offering high-value one-time windfalls
- * Stock Redistribution terminal spends Stock Bills -- weekly exchanges offer best material rates in the game
- * Wuling terminal upgrades require Stock Bills -- increase daily Elastic Goods limits
- * Start trading immediately on outpost unlock -- every missed day compounds into lost Stock Bills
Contents
What Are Wuling Stock Bills?
Wuling Stock Bills are the exclusive currency of the Wuling region, separate from Valley Stock Bills earned in Valley IV outposts. They are the primary medium of exchange for Wuling-specific purchases and cannot be obtained outside of outpost trading.
Key Characteristics
Region-locked: Currency only exists within Wuling -- earnable at Sky King Flats, spendable at Wuling Stock Redistribution terminal
No conversion possible: Valley Stock Bills and Wuling Stock Bills cannot exchange at any rate
Outpost-exclusive: The only source of earning is Sky King Flats trading
Capped by Wuling economy: Limited by outpost level, Prosperity, and trade availability
Stock Bill vs Valley Stock Bill
| Feature | Valley Stock Bills | Wuling Stock Bills |
|---|---|---|
| Region | Valley IV | Wuling |
| Earning Location | Refugee Camp, Infra-Station, Planned Construction Area | Sky King Flats (Jingyu Valley) |
| Spend Location | Valley Stock Redistribution terminal | Wuling Stock Redistribution terminal |
| Conversion | Cannot convert | Cannot convert |
| Main Use | Valley terminal, trades, weapons | Wuling terminal, Tier 3 gear materials |
| Authority Unlocks | Game start | Level 43 (Wuling unlock) |
Unlocking Sky King Flats Outpost
Before any Stock Bill income, you must unlock Wuling's only trading outpost.
Requirements Checklist
- 1. Complete "Arrival at Wuling" main story quest
- 2. Authority Level 43+ -- minimum to enter Wuling
- 3. Complete "Where Danger Sleeps" main mission
- 4. Complete follow-up exploration mission -- additional questline required
Location
Sky King Flats is located in Jingyu Valley, the first accessible sub-region of Wuling. After unlocking, it appears on your map with standard outpost icons.
Common Unlock Issues
Level gate
Some players grind Valley content to Authority Level 50+ before Wuling -- unlock happens at Level 43 exactly via the "Arrival at Wuling" main story quest.
Quest chain missing
"Where Danger Sleeps" is a multi-part mission -- complete all stages. The subsequent exploration mission is also required.
Teleport points
Ensure Jingyu Valley teleport waypoints are activated for fast access. See the Wuling Region guide for full exploration details.
Make This a Top Priority
Every day without Sky King Flats is a day without Wuling Stock Bill income. The compound loss adds up significantly over weeks. Complete the unlock questline immediately upon arriving in Wuling.
Stock Bill Earning Mechanics
The mechanics of Stock Bill earning at Sky King Flats.
Base Earning System
Every completed outpost trade at Sky King Flats earns Wuling Stock Bills automatically:
Quantity: Determined by trade value/rarity
Formula: Base Stock Bills + Trade Volume Bonus + Prosperity Modifier
No special trades needed: All trades contribute to Stock Bill income
No waste: Excess resources beyond trade needs do not increase Stock Bills
Trade Value Tiers
Higher-value trades generate more Stock Bills. Prioritize trades offering better rewards:
- * Prosperity trades: Offer better Stock Bill per resource ratios
- * High-tier requests: Rare/crafted materials yield higher payouts
- * Multi-resource orders: Complex trades reward more Stock Bills
Environmental Monitoring Missions
Photo-based monitoring missions provide significant Stock Bill windfalls as a supplement to daily trading:
Reward: 50,000+ Stock Bills per completed task
Method: Photograph specific landmarks or environmental features across the Wuling map
Effort: Medium (requires exploration + photo shooting)
Frequency: One-time per task -- not repeatable
Type: Independent from outpost trading system
Environmental Monitoring missions serve as high-value milestones rather than daily income. Use these windfalls to accelerate terminal upgrades or fund large Stock Redistribution exchanges.
Daily Limits
No hard cap
Earn as many Stock Bills as trades you complete
Trade availability
Limited by number of active trade requests
Prosperity cap
Higher Prosperity unlocks more/better trades
Operator Liaison Bonuses
The most reliable way to increase Stock Bill income per trade.
Three Bonus Types
Assign operators with matching attributes for a 20% trigger chance on each trade:
| Bonus Name | Attribute | Effect |
|---|---|---|
| Turn Scrap to Treasure | Hobbies | 20% chance to earn +1 extra Stock Bill per trade |
| Survival Knowledge | Expertise | 20% chance to earn +1 extra Stock Bill per trade |
| SAR Response | Faction | 20% chance to earn +1 extra Prosperity per trade (indirect) |
Optimization Strategy
Stock Bill focus
Assign 2 operators with Hobbies + 2 with Expertise for up to +4 Stock Bills total (if all bonuses trigger)
Balanced approach
1 Hobbies, 1 Expertise, 2 Faction for mixed Stock Bill + Prosperity growth
Check attributes
Review each operator in your roster for matching traits via the Trust system
Trigger Mechanics
Independent rolls: Each matching operator makes a separate 20% trigger check
Stacking potential: With 4 matching operators, maximum +4 Stock Bills per trade (statistically rare)
Expected value: 2 matching operators ≈ 0.4 Stock Bills expected per trade (steady growth)
Finding Matching Operators
Important: Sky King Flats Requirements Are Region-Specific
The specific attribute requirements (Faction, Hobbies, Expertise) for Sky King Flats are NOT documented publicly and may differ from other outposts like Refugee Camp.
To find matching operators: Open the Sky King Flats Liaison assignment menu in-game to see the exact requirements, note the displayed attributes, check operator attributes in the Trust system (main menu → Trust tab), and assign operators with matching attributes. Always verify in-game.
Priority: Stock Bills Over Prosperity
In early and mid-game, prioritize Stock Bill bonuses (Hobbies/Expertise) over Prosperity bonuses (Faction). Stock Bills unlock immediate progression tools: Depot upgrades, Stock Redistribution terminal purchases, and weapon stores. These provide direct value that compounds faster than Prosperity-driven benefits.
Maximizing Stock Bill Income
Strategic approaches to fastest Stock Bill accumulation.
Day 1 Priorities on Outpost Unlock
- 1. Unlock Sky King Flats (via "Where Danger Sleeps" quest completion)
- 2. Immediately begin first trade (start timer)
- 3. Check all active trade requests
- 4. Assign best Operator Liaison matches
- 5. Prioritize highest-value trades first
- 6. Collect trade rewards immediately
- 7. Repeat cycle
Weekly Optimized Routine
Daily log-in: Complete all available trades at Sky King Flats
Weekly Stock Redistribution: Spend earned Stock Bills before resetting cooldowns
Prosperity tracking: Monitor level progress and trade quality improvements
Operator rotation: Test new operators for better Liaison attribute matches
Late-Game Income Sources
Multiple Wuling AICs
Expand factory capacity (does not increase Stock Bills directly, but frees more resources for trading)
Automated pipelines
Set up factory-to-outpost flows for constant trade fulfillment
Prosperity maxing
Higher Prosperity yields higher-value trades consistently
Environmental Monitoring Strategy
Balance one-time windfalls with consistent daily trading:
- * Prioritize outpost trading first: Daily trades compound over time -- Environmental Monitoring is supplemental
- * Use windfalls for upgrades: 50,000+ bill rewards are perfect for funding Stock Redistribution terminal expansions
- * Complete during exploration: Tackle Monitoring missions while unlocking new areas -- efficient use of travel time
- * Check requirements before traveling: Verify photo targets are accessible with your Authority level
- * Balance vs trading time: Don't skip outpost trading days for Monitoring missions -- both contribute to long-term growth
Stock Bill Spending Priorities
Wuling Stock Bills serve multiple purposes -- spend them wisely in this order.
Priority 1: Weekly Stock Redistribution Exchanges
Best Value Allocation
The Stock Redistribution terminal in Wuling offers weekly exchanges with the best material rates in the game.
- • Exclusive Wuling materials unavailable elsewhere
- • Tier 3 gear components
- • Limit: once per week per category
Always spend Stock Bills here first -- the exchange rates are unbeatable and materials are critical for endgame gear progression. Missing a weekly reset compounds into lost progress.
Priority 2: Wuling Terminal Upgrades
The Stock Redistribution terminal itself can be upgraded to improve efficiency:
- • Increases daily Elastic Goods limits -- more trading volume per day
- • Unlocks new categories of items -- access to more trading options
- • Reduces cooldown times -- faster trade cycles
- • Cost: Wuling Stock Bills + materials
Upgrading early makes every subsequent week more efficient. Higher purchase caps mean more opportunities to catch deep discounts on Elastic Goods.
Priority 3: Wuling Weapon Store
Some region-specific weapons require Stock Bills:
- • Unique Wuling weapons with special effects
- • Endgame weapon enhancements
- • Weapon upgrade materials not available elsewhere
Only purchase weapons you actively use -- Stock Bills are a bottleneck resource. Research weapon stats and synergies before spending.
Priority 4: Gear Assembly Materials
Some Wuling gear recipes use Stock Bills as a crafting input:
- • Tier 3 gear set components
- • Rare augment materials
- • Socket upgrade components
Cost varies; spend only on gear you're actively upgrading. Prioritize investments that contribute to your immediate gear progression goals.
Spending Flowchart
Environmental Monitoring → Weekly Stock Redistribution → Terminal Upgrades → Weapons → Gear Materials
(50k+ windfalls) Best resource rates → Better income options → Power gains → Endgame
Wuling Trade Optimizations
Specific strategies to maximize efficiency at Sky King Flats.
Factory Integration
Your Wuling factory feeds the outpost. Set up efficient production chains:
LC Wuling Batteries
Highest-value trade good -- powers both factory and trade. Produced at Forge of the Sky using Xiranite materials.
Xiranite Components
Mid-tier trade value -- supports power chain and gear crafting.
Finished goods only
Trade processed items, not raw materials. A raw Yazhen or Jincao has minimal value -- process into consumables first.
Automation Setup
Passive income is the long-term goal:
Depot Bus connections: Auto-fill orders from factory output. Wuling features free-placement Depot Buses for flexible layouts.
Production-to-Depot-to-Order pipeline: Hands-off trading. Factory outputs to Depot, Depot feeds outpost orders automatically.
Stocked Depots: Always maintain inventory buffer for unexpected trade requests. 20-30 units buffer prevents missed high-value trades.
Prosperity Growth
Higher Sky King Flats Prosperity improves trades:
- * Better Stock Bill multipliers: Higher Prosperity = more Bills per trade
- * More trade options: Unlock new trade categories
- * Expanded AIC area: Larger factory space for more production lines
For full guide on outpost mechanics and Prosperity leveling, see the dedicated Outpost Guide. Prosperity increases from trading high-value items processed from your factory.
Common Mistakes & How to Avoid Them
1. Trying to Convert Valley Stock Bills
Valley Stock Bills and Wuling Stock Bills are completely separate currencies. You cannot exchange one for the other. Treat them as two parallel economies running simultaneously. Build Wuling Stock Bill income from scratch via Sky King Flats trades. Maintain both Valley and Wuling factory pipelines.
2. Ignoring Operator Liaison Bonuses
Players often skip operator assignment and miss guaranteed expected value increases. Always assign 2+ operators with Hobbies/Expertise attributes for steady +0.4 to +0.8 Stock Bills per trade. Over hundreds of trades, this adds up to significant gains for minimal effort.
3. Delaying Outpost Unlock
Every day without the outpost is a day of lost Stock Bill income. The compound loss is significant over time. Complete "Where Danger Sleeps" on Day 1 of unlocking Wuling. Make this a top-3 priority after arriving in Wuling.
4. Hoarding Stock Bills Indefinitely
Stock Bills have weekly redemption opportunities at the Stock Redistribution terminal. Leaving them idle wastes efficiency. Spend Stock Bills weekly at Stock Redistribution exchanges. Maintain a small cushion (2-3 weeks' worth of exchange costs), then spend the rest. Unspent Bills lose value to inflation via missed opportunity.
5. Prioritizing Low-Value Trades
Trade selection matters. Completing many low-value trades yields fewer Stock Bills than fewer high-value trades. Scan all active trades and prioritize those offering better rewards. Match resource availability to trade requirements. Trade quality progression comes from Prosperity growth.
6. Not Tracking Trade Cooldowns
Trade completion has cooldown periods. Forgetting to collect missed trades is lost income. Log in daily, collect completed trades, and start new ones immediately. Set a habit of checking before doing other content. Daily consistency beats infrequent bulk trading.
7. Spending on Equipment Before Upgrades
Buying weapons or gear materials before upgrading the Wuling terminal reduces long-term income potential. Spend first on Terminal Upgrades (Expand Elastic Goods limits) for better daily returns, then purchase equipment. Upgrades compound; equipment is static value.
8. Neglecting Prosperity Growth
Sky King Flats Prosperity level affects trade quality and availability. Stagnant Prosperity means stagnant income. Prioritize trades that increase Prosperity when available. Assign SAR Response (Faction) operators to boost Prosperity growth. Higher Prosperity unlocks better trades with higher Stock Bill payouts.
9. Ignoring Environmental Monitoring
Photo-based missions offer 50,000+ Stock Bills per completion, but players often overlook them while focusing on daily trades. Check for available Environmental Monitoring missions periodically. Complete them during area exploration for efficient time use. Use the large bill windfalls to accelerate terminal upgrades or fund weekly Stock Redistribution purchases. These one-time rewards are too valuable to ignore.
Quick Reference Checklist
Frequently Asked Questions
How do you get Wuling Stock Bills in Arknights: Endfield?
Wuling Stock Bills are earned primarily through trading at Sky King Flats outpost in the Wuling region. Complete the 'Where Danger Sleeps' quest at Authority Level 43+ to unlock the outpost, then complete trades to earn Stock Bills. Environmental Monitoring missions also provide 50,000+ Stock Bills per completion as supplementary income. Assign Operator Liaisons with Hobbies or Expertise attributes for bonus Stock Bills.
What should you spend Wuling Stock Bills on in Arknights: Endfield?
Prioritize Weekly Stock Redistribution exchanges first (best material rates), then Wuling terminal upgrades (expand daily Elastic Goods limits), then Wuling weapon store (endgame weapons), and finally Gear Assembly materials (Tier 3 gear components). Spend Stock Bills weekly at Stock Redistribution to maximize value.
Can you convert Valley Stock Bills to Wuling Stock Bills in Arknights: Endfield?
No, Valley Stock Bills and Wuling Stock Bills are completely separate currencies that cannot be exchanged. Valley earns Valley Bills, Wuling earns Wuling Bills. You must build both economies in parallel -- maintain Valley outpost trading while starting Wuling trading after Level 43.
What are the Operator Liaison bonuses for Wuling outpost trading in Arknights: Endfield?
Three bonus types: Turn Scrap to Treasure (Hobbies match, +1 Stock Bill, 20% chance), Survival Knowledge (Expertise match, +1 Stock Bill, 20% chance), SAR Response (Faction match, +1 Prosperity, 20% chance). Assign 2 operators with Hobbies/Expertise for steady +0.4 to +0.8 Stock Bills per trade expected value.
When do you unlock Sky King Flats outpost in Arknights: Endfield?
Sky King Flats unlocks at Authority Level 43 after completing the 'Arrival at Wuling' main story quest and the 'Where Danger Sleeps' main mission, followed by an exploration mission. It is located in Jingyu Valley and is the only source of Wuling Stock Bills from trading.
What are Environmental Monitoring missions in Arknights: Endfield?
Environmental Monitoring missions are photo-based tasks where you photograph specific landmarks or environmental features across the Wuling map. They reward 50,000+ Stock Bills per completed task -- high-value one-time windfalls that supplement daily outpost trading. These missions are time-intensive but extremely rewarding, and should be completed during area exploration for efficient time use.