Questions tagged [smart-contracts]

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how to calculate the value of a single LQT token for Liquidity Baking?

In looking at the Granadanet contract storage, I can see the amount of tzBTC, Tez, and LQT tracked in/by the CPMM. Here are those values as of writing this: tokenPool 45805 xtzPool 111379958864916 ...
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1answer
7 views

what is the Liquidity Baking subsidy used for and how do liquidity providers benefit?

I've read the official Tezos docs on liquidity baking. However these docs do not explain how the subsidy will be used, or what it's even for. How will this subsidy be used, and how will liquidity ...
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1answer
25 views

call to 'approve' entrypoint of tzBTC contract failing with 'UnsafeAllowanceChange'

I'm trying to call addLiquidity on the Liquidity Baking CPMM. I've already called xtzToToken on the CPMM and given my address tzBTC. I can see that my address has tokens on the tzBTC contract when I ...
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15 views

what's a sensible minLqtMinted to send to the Liquidity Baking CPMM when calling addLiquidity?

I'm trying to understand what a sensible value is for the liquidity token (LQT) parameter when calling the Liquidity Baking CPMM. I'm reading the Dexter docs here, since the CPMM is a fork of the ...
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1answer
16 views

Originate smart contract with empty arguments

I try to initialize a smart contract with five arguments being nat * timestamp * nat * timestamp * address. However, I only want to fill the last argument with some value but for the first four I try ...
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1answer
19 views

value is invalid for type

I'm trying to call the addLiquidity entrypoint of this contract, which is a copy of the Liquidity Baking CPMM contract, which is itself a copy of the Dexter contract. The original Dexter docs give an ...
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1answer
108 views

How to provide liquidity to the upcoming liquidity baking tez/tzBTC?

I've tried to understand how to interact on the interface on Better Call dev but can't seem to figure it out. When I execute them under simulation I get failed transaction. Where do I insert the ...
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1answer
52 views

Can't get tzBTC out of the tzBTC Granadanet contract

i'm trying to (eventually) add liquidity to the Liquidity Baking CPMM contract on Granadanet. In order to add liquidity, I need some tzBTC from the tzBTC contract here.. I cannot, for the life of me, ...
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1answer
41 views

Contract does not exist

I'm using a Granadanet node to experiment with Liquidity Baking. I'm trying to call the tzBTC contract's mint entry point. This is my first time using a test net, but I thought that it was a copy of ...
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21 views

How can we accept USDTZ in smartpy smart contracts, is it even posible?

I was working on a token sale, so is there any way we can accept USDTZ as a mode of payment for the tokens?
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2answers
194 views

Any way to get the public key of an address?

I am developing a dapp where I need the public key of an address of the user, is it possible to get the public key in the contract (using SmartPy)? Or even on the client side using taquito or any ...
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27 views

Mint FA2 NFT when contract is called by purchaser

I'm working on a smart contract which allows a caller to "purchase" an NFT simply by calling the contract and providing payment. I'd like the contract to mint the NFT at the time the ...
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1answer
70 views

Converting a hash into an int within a range

I have a contract where I'd like to convert a hash (sha256 in this case, but I'm open to any of the other hashing algorithms available) into an Int (or Nat) between 1 and 100. I have the code that ...
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1answer
74 views

Limiting the time (time/date based) that a contract method can be called

I'd like to publish a contract that allows calls up until a certain time and date. For example, say I want to allow anyone to call it for 1 year after publishing the contract to the blockchain, then ...
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1answer
32 views

Using sp.create_contract to generate pseudorandom numbers on-chain

In this answer, the answerer suggested that CREATE_CONTRACT could be used to generate a contract address which could then be used as a seed for a pseudorandom number in a contract. What would a simple ...
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1answer
26 views

Pseudo-random numbers for NFT attribute random generation

I'd like to generate an NFT within a contract and give it a randomly occurring attribute. As I search, it seems that the only fully-secure way to do this is to use an Oracle or build some sort of ...
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1answer
31 views

Tweaking FA1.2 to add level based balance snapshots to assist token voting in a DAO

DAOs functioning on a token voting mechanism (using either FA1.2 or FA2) mostly require the locking up of tokens for the entirety of the voting period essentially to prevent double-voting or any form ...
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1answer
28 views

Error: list indices must be integer, not Expr

I am trying to get the first N prime numbers in the following way: @sp.entry_point def n_primes(self, num): primes = [2] p = sp.local("p", 1) i = sp.local("i&...
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1answer
25 views

Smart contract break for loop in smartpy

I need to break a for loop in smartpy, but break does not work. Is there any other solution I could use?
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1answer
27 views

tqtezos / minter-sdk installation issue

I am trying to run below command for minter-contract on my local machine and getting error npm i @tqtezos/minter-contracts no such file or directory, chmod ‘/node_modules/@tqtezos/minter-contracts/...
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2answers
27 views

Keeping original sender in inter-contract call

I have a token contract (let's say it TC) and creating a contract Wallet. Now, is it possible for a user to call Wallet's entrypoint deposit which will do an inter-contract call to TC's transfer ...
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1answer
23 views

Calling contract deployed on Tezos sandbox using Taquito

I've a simple contract deployed on Tezos sandbox (https://assets.tqtezos.com/docs/setup/2-sandbox/) and I'm using Taquito in frontend to call this contract. Earlier, I deployed the contract to global ...
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1answer
22 views

How to fetch list of known addresses in Taquito?

Just like we can run tezos-client list known contracts to get a list of deployed contracts and any user accounts, is there a way to do the same using Taquito? So, in short, I've RPC address and wish ...
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3answers
34 views

Big map of map vs Big map of pairs

In the FA2 example (https://smartpy.io/ide?template=FA2.py) with multiple assets, we are using a big map of pairs (of user and token). Another option might be storing big map mapping users to another ...
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3answers
51 views

Is there an equivalent of the Ethereum “selfdestruct” opcode in Tezos?

In Ethereum you can implement a selfdestruct opcode in a smart contract to remove its code from the blockchain and free up storage space. Is there an equivalent on Tezos ?
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1answer
41 views

Variable callback entrypoint in smartpy

Is it possible to use a variable as the entry_point for a callback in smartpy? This works: @sp.entry_point def getProofs(self, address, callback_address): c = sp.contract(...
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1answer
72 views

Can a smart contract know its own address?

Is it possible to create a smart contract that knows the value of its KT1 address? E.g. if you wanted the contract to check that there was a signature signed over its contract address, would it be ...
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1answer
18 views

decidability of real world contracts

I'm wondering if there has been any work done on the decidability of real world, legal contracts. Michelson is great because it lends itself to users bring able to write smart contracts that are ...
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1answer
18 views

Checking total amount sent to a contract (ever) within the contract execution

I'd like to create a contract that behaves a certain way based on how much total tez has been sent to the contract. How should I track and check the total amount ever sent to a contract? Example: ...
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0answers
51 views

How to transfer tokens from contract using better-call dev?

I was just playing around with creating a token on Tezos mainnet. I followed the tutorial to create a Tezos token. There they use this ready to use contract in PascaLIGO which you can view in Ligo ...
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0answers
14 views

Does sapling integration mean private smart contracts?

Now that Tezos has integrated the sapling features from Zcash, can one make private smart contracts? Potentially? Certainly? In part or whole, or both? Thank you!
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2answers
71 views

Why is this big map update using up so many bytes?

In this question I asked why so much Tezos was burned when updating 380 cells in a grid. It's surprising to see how many bytes it actually took though. If you look at the transaction, there were 380 ...
2
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1answer
56 views

Node issues with multiple transactions to the same smart contract (FA1.2)

I was wondering if there is any explanation available to some unexpected behavior when trying to make multiple transactions to the same smart contract. Transaction We have an FA1.2 token whereby we ...
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1answer
43 views

How can I encode a 2D matrix of booleans in the least amount of bytes?

I'm looking at this ethereum smart contract that iterates over an area in a 2D bool matrix to reserve pixels. When looking at a call to that ethereum smart contract for a 20x11 area, it used 0.0315 ...
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1answer
33 views

What would be the simplest way to connect a smartpy contract to an oracle tracking the XTZ/USD pair?

I see there's a smartpy chainlink oracle example and a github repo for Harbinger. I briefly looked at the code and it appears they are for setting up Oracles + clients. Are there any existing XTZ/USD ...
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1answer
56 views

How should a contract check whether an address owns a FA2 token created in another contract?

I've broken up my code into 2 contracts. FA2 contract and other one managing its data and providing additional functionality on top. This is to not overload a single contract, however, it does ...
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1answer
92 views

Is there a list of public repos using smartpy?

I'd like to see more complex examples of smartpy being used in main net contracts. So far, I've found tzcolor's auction house contract SUPER helpful. Are there any other really good examples (that are ...
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1answer
75 views

How do offchain views work and what guarantees do they provide?

What are the technical differences between offchain views vs onchain entry points? I know one of the differences is that onchain entry points mutate while offchain views don't. Are there any other ...
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1answer
24 views

How to migrate existing smart contract data to a new one when needing additional storage requirements?

Obviously the first answer is to try to avoid running into this scenario by having some flexibility in storing additional fields using maps (example). However, let's think about the scenario where ...
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1answer
42 views

How to add new record fields in data storage after contract deployment? Is storing JSON in a field viable?

AFAIK, there is no way to update storage types(ex: can't add a new record field to a Map<sp.Nat, sp.record(a=1)>) of a contract after deployment. (Correct me if I'm wrong). This means, after a ...
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1answer
21 views

Does smartpy propagate exceptions?

I'm doing something like this, but the invalid scenario assertion fails. Is there a way to propagate the exception from the other contract? Or do I just have to test that contract separately? class ...
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1answer
43 views

What are good examples of upgradable smartpy contracts using Proxy delegates or stored lambdas?

I'm trying to ensure my contract is upgradable and I learn best by looking at existing examples. Does anyone have any good examples to look at? Here are some links to previous stackoverflow Q&A's ...
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2answers
57 views

How to fetch all the values in a big map using taquito?

Per the BigMapAbstraction Taquito API docs, there isn't a way to fetch all the values in that map. Is the suggested way to fetch all of values in the map by doing batch queries on it then? Or what's ...
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1answer
19 views

Incompatible parameter error when calling another smart contract

I'm getting this weird error when trying to call the mint entrypoint from another contract... I had additional parameters in the BuyLandRequest and was overriding the TezosHomepageAdNft.mint ...
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1answer
59 views

Why aren't the offchain views appearing?

I'm extending the smartpy FA2 template # FA2 = sp.import_script_from_url("https://smartpy.io/dev/templates/FA2.py") class TezosLandNft(FA2.FA2): ... which has the following offchain views ...
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1answer
30 views

How can I do string interpolation on smartpy?

I'm trying to provide better error messages. I've tried several things already that don't work such as regular python fstrings, regular string concatenation. I'm tried to using the sp.string function ...
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1answer
39 views

How do I transfer tez while invoking a smart contract using Taquito?

const op = await contract.methods .buy(contractParams?.height, contractParams?.width) .send(); I have a buy entrypoint and would like to pass in some parameters and some tez at the ...
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1answer
122 views

How to store and load custom FA2 NFT metadata?

First time I'm writing a smart contract. If anything doesn't make sense at all, feel free to call out what specifically doesn't make sense and suggest a better approach. Thanks! At a high level I just ...
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1answer
45 views

What is the one-time 0.257 tz burn fee?

I have deployed a contract on a test net and I want to send some tez to it to test out some operations. When I try to send through Temple wallet, I get: Failed Unable to estimate transaction to ...
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0answers
67 views

FA 1.2 Token contract interaction

I want to call an Approve method on a FA1.2 token contract. Michelson code of Approve method at FA1.2 token contract: (pair %approve (address %spender) (nat %value)) My PascaLigo code: type ...

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