Best Automatic Bilge Pump for Reliable Boat Safety

The bilge floods quietly, water creeping up in the hull’s lowest spot. A leaking hose or sudden wave can leave a boat’s interior soaked before you even notice.

The MAXZONE 1100GPH uses a float switch to activate instantly when water rises. The Johnson Pumps 01674-001 goes heavy duty with a liquid-cooled motor for continuous operation.

The Rule-Mate RM1100B fills the need for efficiency with its Auto Sense float switch and thermal cut-off, preventing overload and blocking issues.

Reliable Automatic Bilge Pumps for Effective Water Removal

Automatic bilge pumps provide rapid response to rising water levels, safeguarding boats with minimal manual effort. Below are detailed evaluations of three efficient models designed for continuous protection.

1. MAXZONE 12V Automatic Submersible Bilge Pump with Built-In Float Switch for Marine Use

Automatic activation activates only when water levels rise, preventing unnecessary power consumption. Rated for 1100 GPH, this pump expedites water removal with a compact footprint of approximately 5.7″ x 3″ x 4″.

Designed with a built-in float that controls an electronic reed sensor, the system simplifies wiring and eliminates the need for external switches. It handles a maximum lifting height near 3 meters, maintaining steady performance even when challenged.

Among its advantages are the durable ABS plastic housing and a detachable strainer base, making maintenance straightforward and reducing downtime. Precision engineering by Sailflo delivers quiet operation and efficient pumping for extended marine use.

Compatibility with 1-1/8″ hoses and a 12V power source suits a broad range of smaller boats and DIY projects. The pump’s flow and power rating strike a balance between fast water evacuation and manageable current draw at 3.8A.

MAXZONE’s thoughtful design delivers an easy-to-install unit that activates under raising water levels, offering consistent reliability without draining the electrical system.

Best for: Boaters seeking a compact, reliable automatic water removal solution with easy maintenance and low power consumption.

Pros:

• Integrated float switch for self-activation
• High 1100 GPH flow rate for rapid drainage
• Compact size fits tight spaces
• Detachable base simplifies cleaning
• Durable plastic construction resists corrosion

Cons:

• Output port size may require hose adapter for some setups
• Short wiring length might need extensions for certain installations

2. Dontmiss Compact 12V Automatic Submersible Bilge Pump with 750 GPH Flow Rate and Float Switch

Handling unexpected water accumulation below deck becomes less stressful with a pump that’s engineered for reliable automatic operation. The integrated float switch in this Dontmiss model activates the pump precisely when needed, eliminating constant manual checks. Its 750 gallons per hour capacity comes from a robust 3-blade impeller, pushing water efficiently to protect your vessel’s interior.

Installation demands attention to detail in positioning; mounting the pump as level as possible keeps the float switch functional without unintended battery drain. The removable base simplifies cleaning by allowing quick access to the snap-off strainer, maintaining peak performance even in debris-prone environments.

Compact dimensions make retrofitting easier, and the combined pump-switch design cuts down on wiring complications. A 3/4 inch outlet fits standard marine bilge hoses, supporting a smooth, collapse-resistant drain pathway. The pump’s ability to lift water up to three meters covers diverse bilge depths.

Dontmiss engineers included dual wiring modes for automatic and manual operation, offering versatility based on your setup preferences. With a minimal current draw of 3 amps at 12 volts, this pump balances power and efficiency effectively, suitable for various small to medium-size boats, ponds, or RV water management.

Experience dependable water removal thanks to a built-in electronic reed sensor that detects rising water levels quickly. The design minimizes user intervention, letting you focus on other tasks while safeguarding your craft.

Best for: Boat owners and small craft users seeking a compact, automatic water evacuation solution that combines simplicity with steady pumping strength.

Pros:

• High flow rate of 750 GPH handles water quickly and reliably
• Integrated float switch for effortless automatic activation
• Removable base and snap-off strainer aid easy maintenance
• Dual wiring options support automatic and manual use
• Compact size ideal for tight bilge spaces

Cons:

• Might requires careful leveling during installation to avoid switch malfunctions
• Auto shutoff delay might cause battery drainage if water levels fluctuate

3. ISURE MARINE 12V Submersible Electric Pump with Built-in Automatic Float Switch 1200GPH

Water accumulation below deck can sneak up quickly, putting your vessel at risk if left unchecked. Handling this challenge requires a pump that activates precisely when water rises, without manual intervention.

Featuring a built-in float switch, this compact unit eliminates the need for external sensors, responding immediately to changing water levels. Its submersible design ensures it operates quietly and efficiently while fully underwater.

Constructed with a rust-resistant stainless steel shaft and a sturdy ABS plastic housing, the pump withstands the corrosive marine environment with resilience. The long-life motor benefits from a water-cooled system and anti-airlock features for uninterrupted operation.

With a flow rate of 1200 gallons per hour and the ability to lift water vertically up to 2.5 meters, this unit handles moderate bilge pumping needs with reliable power. An easy-to-clean snap-off strainer helps keep debris from clogging the mechanism.

ISURE MARINE brings together durability and automation in a design that reduces constant manual checks while keeping your bilge dry.

Best for: Boaters requiring a dependable automatic water removal system with a compact footprint for small to medium vessels.

Pros:

• Integrated automatic float switch avoids extra wiring hassles
• Strong 1200 GPH flow rate suits regular bilge conditions
• Corrosion-resistant materials extend pump lifespan
• Quiet operation when submerged
• Easy maintenance with a removable strainer

Cons:

• Maximum head height may limit effectiveness in larger vessels

4. OASIS MARINE 750 GPH Automatic 12V Bilge Pump with Built-In Float Switch & Snap-Lock Base

Water accumulating in confined bilge spaces poses a threat that demands a reliable removal solution. The OASIS MARINE bilge pump offers an integrated float switch that activates pumping automatically, eliminating the need for external controls while allowing manual override when necessary. This feature simplifies installation and adds operational flexibility at critical moments.

Constructed with a motor shaft made from stainless steel and encased in a sealed housing, this device stands up well against corrosive saltwater environments and vibrations common on small vessels. It moves an impressive 750 gallons per hour through its 3/4 inch hose outlet, efficiently clearing water with a maximum lift of 3.5 meters, which keeps your boat stable and equipment safeguarded.

The snap-lock strainer base enables quick access for cleaning or debris removal, an important convenience in tight spaces that are otherwise tedious to maintain. Notably, OASIS MARINE offers a 2-year replacement guarantee, underscoring its confidence in this pump’s durability and performance.

Designed to fit fishing boats, pontoons, and jon boats, this pump responds quietly and consistently to conditions that require prompt water removal. Its compact size and thoughtful engineering meet the practical needs of boat owners who demand straightforward reliability without fuss.

Best for: Boaters requiring a robust, easily maintainable pump that automatically handles excess bilge water to protect gear and maintain vessel stability.

Pros:

• Integrated float switch for true automatic operation with manual override.
• Marine-grade stainless steel shaft resists corrosion and vibration.
• Snap-lock strainer base allows fast cleaning without removal.
• Quiet operation suitable for sensitive onboard environments.
• High flow rate of 750 GPH handles water removal efficiently.

Cons:

• Wiring configuration may require verification before installation to avoid initial misconnection.
• Leader wire length might necessitate additional wiring for some setups.

5. Johnson Pump 05903-00 Submersible 12V Bilge Pump Combo with Automatic Float Switch

Keeping a bilge dry without constant monitoring demands a pump that activates independently when water rises. The Johnson Pump 05903-00 features an electro-magnetic float that triggers the pump automatically, eliminating manual intervention. This automatic activation protects your vessel efficiently and reliably, adjusting to water levels without delay.

Installation hassles often arise with standard discharge fittings, but this model solves that by using Dura-Port discharge ports designed to prevent damage caused by overtightened hose clamps. It includes both straight and 90° smooth elbow ports, plus a removable check valve to help maintain steady flow and prevent backflow.

With a flow rate rated at 1000 gallons per hour, this pump moves water swiftly and can lift up to 36 inches vertically, which suits many mid-sized boats. The compact size and lightweight plastic construction allow placement in tight bilge compartments without adding extra bulk or weight.

Johnson Pump backs this model with a limited 3-year warranty, underscoring confidence in its durability. Users have noted its capacity to handle debris and ease of service due to cartridge design, though routine checks on the float switch keep performance consistent over time.

Exceptional self-activation and robust flow capacity make this combo an asset on waterways where potential flooding forms unexpectedly. It reduces the risk of manual errors and battery drain from a continuously running pump.

Best for: Boaters needing reliable unattended water removal with straightforward installation and maintenance.

Pros:

• Automatic electro-magnetic float switch activates without manual input
• Dura-Port fittings prevent stress cracks from overtightened clamps
• Includes multiple discharge ports and removable check valve for adaptability
• High flow rate of 1000 GPH efficiently moves bilge water
• Compact design fits well in confined engine compartments or bilges

Cons:

• May require periodic cleaning to maintain float switch reliability

6. Whale Supersub Smart Electric Bilge Pump with Automatic Sensor for Tight Spaces

Designed for confined bilge areas, this pump fits where space is at a premium, keeping your vessel dry without fuss. Its low profile makes it an excellent choice for boats where bulky equipment just won’t work.

Equipped with a built-in sensor, the unit activates by itself—no separate switch required—making water removal smooth and hands-free. The air-lock reduction feature stabilizes performance, preventing common pump cycling issues that can interfere with efficient water ejection.

The rotating outlet and pump body allow installation at multiple angles, adding flexibility when positioning the device. Included mounting wedge improves stability to reduce cycling problems that might otherwise shorten pump lifespan.

Whether operating in saltwater or fresh conditions, the pump is built tough with materials certified by international standards to withstand harsh marine environments. Whale’s attention to detail, evident in the smart automatic sensor and durable plastic construction, results in reliable operation over time.

Best for: Sailboat and small craft owners who require a space-saving solution that automatically manages bilge water with minimal intervention.

Pros:

• Automatic operation without need for an additional switch
• Compact design fits tight bilge spaces
• Adjustable outlet and pump body for versatile installation
• Reduces air-lock for continuous pumping efficiency
• Compatibility with both fresh and saltwater settings

Cons:

• Sensor activation may require the pump to be partially submerged for reliable switching

7. Johnson Pumps 01674-001 Heavy Duty 12V Submersible Pump with Ultima Sensor

Handling unexpected water accumulation in confined spaces calls for a pump with solid durability and reliable automation. Johnson Pumps engineered a submersible unit with a liquid-cooled, 12-pole motor that integrates double ball bearings for longevity, making it ready to tackle continuous pump duty without overheating.

The motor design features a lip-sealed housing that guards against leaks, extending the pump’s lifespan in challenging wet conditions. With a flow capacity rated at around 1600 gallons per hour, it moves water efficiently through both 1-1/8 and 1-1/4 inch outlets, addressing a variety of bilge and drainage needs.

Equipped with an innovative Ultima switch, it activates automatically when water enters the bilge area and ceases operation upon drying, minimizing battery drain and user oversight. The red thermoplastic body resists corrosion and impact, keeping the unit functional in demanding marine environments.

Johnson Pumps balances strong performance with quiet operation, making this pump a practical choice when you want to minimize noise without compromising power. At just over two and a half pounds, it’s compact yet robust for a variety of boat sizes and configurations.

Best for: Marine enthusiasts needing a reliable, automatic bilge solution that combines durable components with strong pumping power.

Pros:

• Heavy-duty motor with double ball bearings enhances service life
• Automatic Ultima switch for water-activated operation
• High flow rate of approximately 1600 GPH manages bilge water effectively
• Durable thermoplastic housing withstands harsh marine conditions
• Quiet performance reduces noise during operation

Cons:

• Automatic switch may occasionally fail to turn off promptly for some users
• Instruction documentation could be clearer for setup guidance

8. Rule Compact 12V Submersible Pump with Auto Sense and Thermal Cut-Off Protection

Removing unwanted water effectively demands a pump that not only moves fast but adapts to your boat’s changing conditions. The Rule-Mate model accomplishes this by delivering up to 10% more flow without increasing power consumption, making it a highly efficient water evacuation solution.

Activating automatically between water levels of 2″ and 3/8″, it offers a hands-off system that guards against flooding without constant supervision. Should the sensor ever block, a backup mechanism cycles every 2.5 minutes to maintain flow control.

Constructed with a thermal cut-off and cleverly-hidden air vents, it avoids overheating and airlock challenges that often shorten pump life. Installation is streamlined with its threaded discharge fitting, accommodating tight spaces with ease.

Rule engineers designed this unit with reliability and low maintenance in mind, incorporating a backflow prevention system that keeps the pump working smoothly. Its compact dimensions and quiet operation add convenience to performance, whether docked or out on the water.

Best for: Boaters needing a robust, automatic drainage solution that conserves power and offers dependable protection.

Pros:

• Enhanced flow rate without extra power draw
• Automatic sensor activation with backup cycling
• Thermal cut-off and no-airlock design for longevity
• Simple threaded discharge for quick setup
• Compact size fits limited installation spaces

Cons:

• Float switch may require occasional monitoring in some conditions
• Automatic function might not engage if sensor becomes obstructed

9. Amarine Made 12V Submersible Boat Pump with Built-In Automatic Float Sensor

Keeping a boat dry often depends on the reliability of its water removal system, yet many presume all automatic pumps respond equally to rising water levels. This pump challenges that view with its built-in electronic reed sensor that activates the motor without any external float switch needed. It starts only when triggered by the internal float, preventing unnecessary power drain.

Designed to handle high volume swiftly, its 2000 GPH flow rate tackles bilge water with efficiency. The compact form fits crowded compartments, while corrosion-resistant materials like a stainless steel shaft and high-impact plastic casing harden it against harsh marine environments.

While many pumps require separate floats or complex wiring, this unit offers an integrated solution, simplifying installation. Users appreciate the quiet yet powerful motor that balances performance and long life, making it suitable for frequent or emergency use.

Known for dependability under typical use, some have noted occasional issues with the impeller or float sensor sensitivity, suggesting that regular inspection might help maintain function. Amarine Made sticks out for combining automatic responsiveness and durable design in one submersible package.

Best for: Boaters who need a straightforward, compact automatic water removal system with high flow capacity for small to mid-sized vessels.

Pros:

• Integrated float switch eliminates external components
• High flow rate of 2000 gallons per hour
• Rustproof stainless steel shaft and sturdy housing
• Automatic power activation saves battery life
• Compact design fits tight spaces easily

Cons:

• Impeller may suffer damage under certain conditions
• Float switch sensitivity could require adjustment or maintenance

10. Sanuke 1100GPH Marine-Grade Automatic Submersible Pump for Boats and RVs

Keeping your vessel free from unwanted water accumulation gets simpler with a pump that activates based on rising water levels. The Sanuke unit provides a robust flow rate of 1100 gallons per hour, powerful enough to handle water removal tasks for boats around 16 to 25 feet, as well as ponds and pools.

Featuring a built-in float switch, this device eliminates the need for separate sensors, offering a seamless automatic operation. It kicks on once water reaches 40-50mm depth and shuts off when levels drop to 20-30mm, minimizing manual intervention without risking overheating.

The compact design measured at just over 6 inches in length suits tight installation spaces and connects easily to standard 29mm outlet hoses. Sanuke’s use of corrosion-resistant stainless steel shafts within a moisture-tight ABS housing safeguards long-term functionality in harsh marine environments.

Automatic or manual mode options allow you to tailor pump operation instantly via triple-color coded wiring without complex rewiring. A snap-off strainer helps maintain steady flow by preventing large debris from clogging the pump, keeping performance consistent over time.

Besides uncomplicated setup and reliable activation, it draws only 3.2 amps at 12 volts, striking a careful balance between power consumption and effective water management. Sanuke’s integrated solution streamlines bilge maintenance and reduces potential failure points common in multi-component systems.

Best for: Boaters and RV owners wanting an efficient, low-maintenance solution that adapts quickly to changing water levels without added complexity.

Pros:

• High flow capacity suitable for small to medium boats and water features
• Built-in float switch for hassle-free automatic operation
• Compact size fits into limited spaces with ease
• Durable stainless steel shaft and corrosion-resistant housing
• Simple manual override available without rewiring

Cons:

• May require compatible hose fittings and clamps sold separately

Key Specs Compared: Top Automatic Bilge Pumps

Product Name	Flow Rate	Voltage / Current	Max Lifting Height / Head	Float Switch & Outlet
MAXZONE 1100GPH Submersible	1100 GPH (18.33 GPM)	12V / 3.8A	3.0 M	Built-in float switch; 1-1/8″ outlet
Dontmiss 750GPH Auto Pump	750 GPH (12.5 GPM)	12V / 3A	3.0 M	Built-in float switch; 3/4″ outlet
ISURE MARINE 1200GPH	1200 GPH	12V / 3.5A	4 M	Built-in float switch; 1-1/8″ outlet
OASIS MARINE 750GPH Pump	750 GPH (12.5 GPM)	12V	3.5 M	Built-in float switch; 3/4″ outlet
Johnson Pump 05903-00 1000GPH	1000 GPH (0.06 m³/min)	12V	0.9 M (36 in)	Electro-magnetic float; ports included
Whale Supersub Smart 650GPH	650 GPH (3.79 L/min)	12V	1 M	Built-in electronic sensor; rotating outlet
Johnson Pumps 01674-001 1600GPH	1600 GPH (100 L/min)	12V / 7A	1 M	Ultima switch; 1-1/8″ & 1-1/4″ outlets
Rule-Mate RM1100B 1100GPH	1100 GPH (18.33 GPM)	12V	1 M	Auto Sense float switch; threaded discharge

What Factors Define the Best Automatic Bilge Pump?

Not every bilge pump will suit every boat or water challenge. Matching features to your vessel and conditions shapes how well a pump performs its job.

Flow Rate (Gallons Per Hour)

Flow rate indicates the volume of water a bilge pump can discharge within an hour. This measurement is a key factor when selecting a pump because it influences how swiftly your boat stays dry.

Examples range from 650 GPH models like the Whale Supersub to powerful units such as the Johnson Pumps 01674-001 with 1600 GPH. Pumps with higher flow rates feature larger impellers and motors, consuming more power but clearing water rapidly.

Choosing a pump with an insufficient flow rate can lead to slow water removal during heavy leaks. A pump that can’t keep pace risks rising bilge water levels, which may cause serious damage or even sinking.

Maximum Head (Lifting Height)

The maximum head measures how high a bilge pump can push water vertically. A pump rated for 3.0 meters lifts water farther upward than one with a 1 meter rating. This factor is key if your boat has a deep bilge or a discharge hose running uphill.

It depends on the motor’s power and impeller design. For example, ISURE MARINE pumps have a 4-meter head rating, allowing them to move water over higher obstacles without losing much flow.

Choosing a pump with too low a head rating risks water backing up. The bilge may flood even if the pump runs, so matching the head capacity to your boat’s setup is critical for reliable performance.

Float Switch Type

The float switch plays a key role in activating the bilge pump when water reaches a certain level. Mechanical float switches operate using a physical arm or reed switch, while electronic sensors detect water without any moving parts.

MAXZONE features a built-in float switch with a reed sensor triggered by water level changes. Johnson Pump uses an electro-magnetic float with a magnetic trigger for quick activation. Rule-Mate’s Auto Sense employs electronic sensing, providing smoother and quieter pump engagement.

If the float switch malfunctions or is installed incorrectly, the pump may fail to start or run unnecessarily. This can cause the pump to run dry, wasting energy, or prevent it from running when needed, increasing the risk of flooding.

Power Consumption and Voltage

Automatic bilge pumps typically operate on 12V systems, aligning with most boat electrical setups. The power consumption varies widely depending on the pump’s capacity. For example, high-flow models like the Johnson Pumps 01674-001 draw about 7 amps, while smaller units such as the Dontmiss run closer to 3 amps.

Efficiency depends on balancing water flow with power use. Pumps like the Rule-Mate, which deliver 1100 GPH at relatively low amperage, demonstrate how motor design impacts energy consumption. Wiring size and circuit load must be adequate to prevent voltage drops, which can reduce pump effectiveness.

Using a pump that pulls more current than the wiring can handle risks tripping breakers or causing heat damage. This jeopardizes the bilge pump’s reliability, potentially leaving your boat vulnerable during critical moments.

Size and Installation Flexibility

Bilge pumps need to fit snugly in a boat’s hull, where space is often limited. The size** and mounting method determine how well a pump fits and how simple it is to install.

The Whale Supersub stands out with its low-profile design, making it perfect for tight bilge spaces. Meanwhile, OASIS MARINE’s pump features a snap-lock base that allows for quick and secure installation without requiring tools.

Choosing a pump too big can lead to improper seating, resulting in vibrations or loose connections. If installation is complicated, it can delay critical bilge operation and increase the risk of leaks during emergencies.

Durability and Corrosion Resistance

Marine pumps face harsh conditions like saltwater, humidity, and debris. Choosing models with stainless steel shafts and sealed housings helps extend their lifespan and keeps them running reliably.

The Johnson Pumps 01674-001 features a lip-sealed housing that effectively blocks water from damaging internal parts. Meanwhile, ISURE MARINE pumps focus on rust-resistant construction, reducing corrosion risks in salty environments.

Pumps made with lower-quality materials tend to wear out quickly and can fail when you least expect it. Corrosion can jam motors or cause leaks, complicating maintenance and jeopardizing safety.

Additional Features

Many bilge pumps come with extra features designed to improve performance and durability. Examples include thermal cut-off switches that stop the motor from overheating and anti-air lock systems that keep water flowing smoothly.

The Rule Compact pump stands out with its thermal cut-off and backup sensor, which helps when the primary sensor gets blocked. Similarly, Whale Supersub uses an air-lock reduction design to stabilize the pump’s cycling, making it more reliable over time.

Pumps lacking these features may suffer from premature wear, inconsistent operation, or unexpected shutoffs that can compromise safety on board. Choosing a pump with these safeguards can help avoid such issues and keep your bilge system running dependably.

Frequently Asked Questions

How does a float switch work in an automatic bilge pump?

A float switch activates the pump when water reaches a certain height by physically or electronically detecting the water level. It prevents pumps from running dry and conserves battery power by only operating when necessary.

Mechanical float switches typically use a buoyant arm or reed sensor, while electronic types sense conductivity or capacitance changes in water presence. Built-in options simplify wiring by integrating the switch with the pump body.

Always position the float switch where water collects and test activation before final installation to avoid false triggers or failure to start.

What flow rate should I choose for my boat’s bilge pump?

The ideal flow rate depends on your boat size and the typical water volume to be removed. Small boats often suffice with 650 to 750 GPH, while larger vessels require pumps moving 1000 GPH or more to handle heavier water ingress quickly.

Remember that a higher flow pump uses more power and may require larger discharge hoses. Pumps like ISURE MARINE at 1200 GPH provide faster emptying but need proper circuit sizing.

Check the bilge space dimensions and expected water accumulation rate to guide your choice for fast and efficient water removal.

Can I install an automatic bilge pump myself?

Many automatic bilge pumps come designed for straightforward installation, often including built-in float switches and standard discharge fittings. Basic wiring knowledge is required to connect to the 12V battery safely.

Placement matters: the pump should sit flat in the lowest part of the bilge, and the float switch must move freely. Secure wiring and fuse protection reduce risks of shorts or failure.

If unsure, consulting a marine electrician or technician helps avoid costly mistakes and ensures the pump operates reliably when needed.

Why does my automatic bilge pump keep running without water?

This usually indicates a faulty or stuck float switch triggering the pump continuously. Dirt, debris, or mechanical damage can jam the float, causing false activation and battery drain.

Electronic sensors might malfunction from corrosion or wiring issues. Inspect the float for smooth movement and clean any buildup. Test electrical connections for secure contacts and proper insulation.

Regular maintenance including cleaning and occasional testing prevents this problem and helps the pump run only when water is present.

What maintenance does an automatic bilge pump require?

Routine maintenance involves checking the pump and float switch for debris, corrosion, and damage. Clear any blockages from the impeller or intake to maintain flow efficiency.

Inspect mounting points and wiring for signs of wear or corrosion. Run the pump periodically to verify automatic activation and ensure the motor isn’t seized.

Neglecting maintenance risks sudden failure when the pump is most needed, potentially causing flooding or damage to your boat’s interior.

Finding the Right Automatic Bilge Pump for Your Boat

The frustration of rising bilge water fades once a reliable pump activates automatically and consistently removes water. Choosing a pump with the right flow rate and float switch setup changes emergency preparedness completely.

Boaters with smaller vessels benefit from compact models like the Whale Supersub or Dontmiss 750 GPH pumps. Larger yachts or commercial boats call for heavy-duty options such as the Johnson Pumps 01674-001 with its high flow and robust cooling.

Install pumps carefully, paying attention to float switch placement and wiring quality. Regular testing, proper sizing, and corrosion resistance will keep your bilge pump working when every drop of water counts.

Last update on 2026-05-03 / Affiliate links / Images from Amazon Product Advertising API