Your journey is worth more than memories.
Der Leng turns every verified action — travel, cleanup, cultural visits, sustainable choices — into USDC-backed rewards that build your financial future. Nothing you do for the planet is forgotten.
Every action earns. Alone or anywhere.
You don't need a group or a corporate account. As a solo traveler, every verified action you take earns BOUN — which converts to LENG, which converts to real USDC. The platform records everything so nothing is lost.
Travel together. Earn together.
When a group acts together — a cleanup crew, a heritage tour, a corporate team — contributions are pooled and verified collectively. BOUN rewards are distributed to each member's wallet. The more you bring, the more everyone earns.
Group actions can qualify for the premium verification tier (1.5×) with an NGO letter or 3rd-party cert — meaning more USDC-equivalent rewards for everyone.
Corporate travel that pays back.
Every business trip generates carbon. Der Leng lets corporate travelers offset that impact and earn USDC-backed rewards simultaneously — turning a cost centre into a contribution record.
Verified zero-emission business trips earn BOUN per kilometre. Scooters, tuktuks, EV cars all qualify.
Every team member's actions are recorded under the corporate account — your ESG record, automated.
Blue Economy and tree planting acts can offset your trip footprint with verified proof — not just a certificate.
Earn beyond travel.
Der Leng is not just for people on the move. If you clean a beach, plant a tree, or remove waste — you earn. These are the acts the world most needs and least rewards. We fix that.
| Action | Earn rate | Evidence needed |
|---|---|---|
| Ocean cleanup | Up to 4,000 BOUN/kg | Photo + GPS + weight |
| Tree planting | BOUN per verified unit | Photo + GPS |
| Waste management | BOUN per verified kg | Photo + receipt |
| Coral survey | BOUN per report | Photo + AI verify |
| Water quality log | BOUN per reading | Data upload |
Cultural visits become contributions.
Visiting a heritage site isn't just tourism — it's an act of preservation. Der Leng verifies your presence at UNESCO and protected sites and applies a geo-multiplier bonus. The more authentic your visit, the higher your reward.
Cambodia geo-multiplier: 1.5× applied to all heritage and marine heritage actions.
Premium tier with NGO letter: 1.5× multiplier — the highest available on the platform.
The ocean pays its guardians.
Blue Economy is Der Leng's flagship sector. Six sub-streams of ocean action — each verified, each rewarded. Premium Blue Carbon actions earn at 1.5–1.75× land carbon rates.
Plastic, nets, ghost gear removal
Mangrove, seagrass, coral
Eco-dives, wildlife watching, surveys
MSC-certified, local fisher buys
Coral bleaching, water quality, biodiversity
Verified sustainable fishing practices
Every purchase. Every transaction. Earns.
You don't have to travel or clean a beach to earn BOUN. Partner merchant cashback means your daily sustainable spending — food, transport, services — all contribute to your USDC-backed balance.
Nothing you do for the planet is forgotten.
Every action you take on Der Leng is recorded permanently — your cleanup, your heritage visit, your EV km, your sustainable purchase. This is your contribution ledger. A verifiable record of the good you have done, that compounds over time.
Your history of contributions never disappears, even if you stop using the app.
Every entry is backed by evidence reviewed by AI and human admin. It's real.
Unlike social impact scores or airline miles, your BOUN converts to real USDC.
This is what Travel Free means.
The name Der Leng TravelFree is a promise. Do enough — clean enough, visit enough, plant enough, spend sustainably enough — and your BOUN becomes LENG, your LENG converts to USDC, and your contributions pay for the next journey. The planet funds your freedom.