Simple smart contract / DApp ideas that you would like to see

Hi. Yes, absolutely. There are many and they vary in quality as you can imagine, but here’s a sample:

A smart contract could offer the bet, then allow one side to accept, and then present back to a public location for someone to take the other side (accept the bet), then the sportsfeed is read on an interval, then when event ends (based on time or a value in the DB, like “Final”), the contract could remit payment/settle.


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:slight_smile: I’d rather implement myself the former

You can implement it the way you prefer :wink:. I was originally thinking of tying the transactions with a repetitive task such as chores to give incentive to our younger relatives. The more you do it, the higher the reward and your chance of getting the pot but there’s never a guarantee. However, oracles from IoT may take a while.

Yes, that is useful. Similar to the Testament Contract, maybe I should edit the starting post with all the submissions for convenience.

i think there will be a space opened up for trusted oracles in smart contracts of all sorts, as these information services will be vital to the functioning of many contracts, which move forward based on new information (and time.)

these will have to be vetted, trusted, secure 3rd party sources of information about the world, trusted enough to be inputted into a smart contract.

it opens up an entirely new angle to the “not your keys, not your coin” meme. as in the future, along with your keys, there will be some ‘trusted information source’ that can move forward a smart contract that your funds may be tied to.

how about something like this…
A platform to make new laws and modify existing ones based on online discussions and respective polls. I think no ADAs will need to be transferred, but a very good Identification system would need to be in place so participation and votes are managed both public and transparent, but also private when needed.

So I know nothing about building Dapps and this may all be idiocy but here’s my two cents: Royalties

Streaming ‘killed’ the music industry right? Well what if we had a pay as you go spotify system…

The IP as in the song is connected to the wallets of the rights holders - the artists and producers etc - every time the song is played on the platform they directly get sent the royalties with no middle men. Works the same way for the consumer - you don’t pay a subscription service, instead you pay for each minute you actually play the music for (like data charges). It could drastically reduce subscription costs whilst improving revenues for artists and producers. Or alternatively you do have a subscription but the subscription fee is held in a type of holding space and distributed only to the rights holders of the songs you actually listen to…

Like I say, I don’t code and only have a limited understanding of Dapps so please be kind if this is a stupid idea.

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Credit Defaut Swap (CDS)
a financial contract whereby a buyer of corporate or sovereign debt in the form of bonds attempts to eliminate possible loss arising from default by the issuer of the bonds. This is achieved by the issuer of the bonds insuring the buyer’s potential losses as part of the agreement.
I picture it as an ICO where, at least part of it, is collateralized or backed by the issuers assets or third parties.

Use Case
Even if capital in the the form of money would be available worldwide, the risk of investing on something someone is doing far away from you will make Interest Rates so high that such money availability can turn to be very limited. (I am picturing here a “currency crisis”, a shortage of money, a free-for-all scenario). So I would want to see this CDS as a way of really unlocking the potential of finance for everyone and his/her/their investment project. Currently I think we can make this through banks and stockmarkets, but in the era of cryptocurrencies where legislation lags behind it, I feel we are missing something in order to be able to trust on an ICO only with a compelling project and no further backing.
As a side note, I also feel that it will be good to be able to put “Staking ADA” as collateral, so if a project goes bust, suppliers and employees can claim what’s owe to them directly from the node.

I feel I am over myself with this thoughts so opinions are more than welcome.

So I’ve lived in some very rural towns in Northern Ontario - and one of the hardest things to get is primary healthcare.

It’s not the drugs - which can be shipped, its the preventative healthcare like physio, massage therapy and dental that really make the difference. The problem is, if Joe hurt’s his back he’s got to either drive for 2 hours or make it worth the Massage Therapist’s time to drive that distance.

What I want to do (but I’m not any kind of coder/programmer/engineer nor do I know any) is give people seeking healthcare the ability to solicit professionals.

The user needs to see that the person they’re hiring is accredited and registered with a college, has insurance, good rep yadda yadda.

But now that we have this platform, we could connect those seeking healthcare and pool their resources together. If you can annonymously yet confidently broadcast your needs to an app, then others in the area could see that someone in your town wants to get a massage therapist.
If you need one as well, you could hop on to that smart contract and reduce the costs WHILE making it more worthwhile for the massage therapist to actually travel the distance.

Does any of that make sence? Healthcare in rural Ontario is an isolation game, and any simple Dapp that could pool communities all seeking the same thing then broadcast that to credentialed professionals to accept or deny.

This could also really transform into a work-vacation app. If you’re a massage therapist in Toronto, it would be amazing to get away for a week to a northern town. In the smart contract could be the # of clients you’ll have, the cost, the bed and breakfast you’ll stay at, and any other bonuses that the little town want to throw in. Maybe they have a high-ropes course or white-water rafting company in town that could sweeten the deal.


I’ve written several business plans on this exact idea, but no one I’ve talked to knew what a blockchain is. If anyone is interested I’d love to lay out everything I have.

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Yes, I’d be interested in learning a little bit more about your business plans. Can you share the synopsis of each or a sample? Just looking for a little more info, not asking for a full download of all your IP.

Fellow business dev member.

I love this idea of a party token.
It could be on card ,bodychip (for the cyborgs),or (and)eye fingerprint .
It must be anonymous .
This would be nice as you could drink and spent without carring money totaly anonymous.
And it would be nice for our Ada Moon party.

Options Like Contracts on the Cardano Chain

is it possible to build contracts that gamble on say transactions values on the Cardano blockchain itself?

For instance I want to gamble that in 20 epochs the total amount of ADAs transacted will be above a certain amount… other people may be willing to gamble that that threshold will not be broken, we all transfer our gambled ADAs to a wallet than the contract will redistribute the ADAs after 20 epochs accordingly to the results.

The kind of healthy speculation that would increases interest and activity on the chain.
The gambles can spread over so many aspects, fees, different timings, size, amount of addresses… what have you… all sort of combinations… and can create a sort of derivative market on the activity of the ecosystem.

Did you check how many casino dapps are already out there ?

ummh… those are all just casino gambling Dapps maybe using the blockchain as source of randomness, right?
My point is not gambling… is hedging on the activity present on the blockchain.

Usually if there is less transactions the value of the coin goes down, more transactions = price rise.

If I can hedge that with smart contracts that monitor the blockchain itself I thought could be a simple useful Dapp that sustains itself without third entities as all the information you need is in the blockchain itself, all it is required is people putting their money in the contracts.

More than a casino is Futures on the activity of the blockchain.

yes and no, you also need to look trading “stack” eg how many units are on ask and bid side so that matchmaking of buyer/seller happens at given time , disproportionate number of units at either side makes price swing either way. You may have high volumes but balanced buy/sell unit offers which makes minor price swings

Hello fellow Cardano community! As a developer, I have been looking around for tutorials but realize smart contracts still do not exist in ADA. As a simple program - here is what I want to see:

QR code appears in the app of one user’s phone or website or whatever (user A) containing an encrypted acknowledgement. Second user (user B) scans this code onto his phone as an acknowledgement using an integrated Cardano dApp. Smart contract executes and funds calculated from the contract are transferred from user B to user A. This is how I envision smart contracts will be widely used.

However, I do have one question - will smart contracts be allowed access to both users’ wallets? I would suggest a secure mechanism to do this once there has been an acknowledgement, but such an acknowledgement (granting access to someone’s wallet from the dApp) would need to be decentralized. I believe this is why Chainlink was created, since Ethereum does not do this inherently. To have an integrated feature in Cardano that does this would he HUGE and would eliminate the need for something like Chainlink.

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For the sake of clarity I started to collect all ideas in the first post and to format them correctly.

This coupon thing reminds me the early days of flying miles. At some point, companies realized they were issuing $ millions worth of travel, effectively printing money like crazy. Now it is much harder to get those …

Exactly!!! with blockchain, this issuance of coupons can be transparent to the consumer, so the issuer can’t arbitrarily “print” them without limits.