We write the smart contracts, metadata pipelines and mobile apps behind NFT products, with a clear view of what Apple and Google will and will not allow.
SIZ Group is an NFT development company in Austin, Texas, and we treat NFTs as what they are technically: tokens on a blockchain that record ownership of an item and point to its metadata. That makes them useful for tickets, memberships, certificates, in-game items, product authenticity records and digital collectibles. We do not make claims about value, returns or resale prices, and we encourage clients to avoid that language too.
Since 2018 our team has designed and developed 678 apps. On NFT projects that experience matters most at the edges where blockchain meets ordinary software: signing in with a wallet, showing tokens in a mobile app, handling failed transactions and passing App Store and Google Play review.
NFT work also carries legal and tax questions that are outside our role. We recommend that clients speak with qualified counsel about how their tokens are offered and described before launch.
We can build the full stack or take on a single layer alongside your existing team.
We write Solidity contracts for ERC-721 single edition tokens and ERC-1155 multi edition tokens, built on audited OpenZeppelin libraries. Contracts ship with automated tests, deployment scripts and documentation of every admin function and who controls it.
We build primary sale and secondary marketplace features including listings, offers, collection pages and activity history. Indexing is handled with a service such as The Graph or a custom indexer, so pages load quickly without querying the chain on every view.
We generate token metadata in the standard JSON format and store media and metadata on IPFS, pinned through a provider so files stay available. Content identifiers mean the file cannot be swapped without the change being visible.
We connect MetaMask, Coinbase Wallet and other wallets through WalletConnect on web and mobile, with sign in using the Sign In With Ethereum message standard. For users new to crypto, we can integrate embedded wallet providers that create a wallet behind an email login.
We implement EIP-2981 so marketplaces can read the royalty amount and recipient for each sale. EIP-2981 only signals the royalty, and payment depends on each marketplace honoring it, so we explain that limit clearly to creators.
Our NFT app development work covers iOS and Android apps that display a user's tokens, scan ticket tokens at events, verify ownership and connect to wallets. Purchase and minting flows are designed around each store's current rules.
Smart contracts are hard to change once deployed, and mistakes can lock or lose user assets. We keep contracts as small as possible, avoid upgradeable patterns unless there is a clear need, and always recommend an independent audit by a specialist security firm before any mainnet launch that handles meaningful value.
We hire only the top 4% of developer applicants and bring more than 10 years of collective experience. Apps built for our clients have passed 10 million downloads, so we design NFT features for people who have never used a wallet, not only for crypto natives.
Talk to usOne team from first call to launch, with demos at every milestone.
We start with a free chat about what the token does for its holder and who will use it. We then choose the token standard, the chain and the ownership rules for admin functions.
We map which actions happen on chain, in your backend and in the app. We also check each planned purchase and display flow against App Store and Google Play policy.
We design onboarding, wallet connection and transaction screens with clear status messages for pending, failed and confirmed transactions. A clickable prototype is tested with people who have never owned an NFT.
Contracts are built and tested on a public testnet while the app and backend are built in parallel. We share testnet builds so you can mint, transfer and view tokens end to end.
We support your chosen audit firm and fix any findings before mainnet deployment. After launch we monitor contract events, indexer health and app crashes under a support plan.
We focus on Ethereum compatible chains, where tooling and wallet support are the most mature.
Tickets as tokens that can be verified at the door and limited in how they are transferred, depending on the contract rules.
Tokens that grant access to a community, content or member pricing, managed through a wallet the member controls.
In-game items that players hold in their own wallet, designed within the limits app stores place on blockchain features.
Certificates, course completions and product authenticity records that anyone can check on a public ledger.
Contract complexity is the first driver. A standard ERC-721 collection with fixed supply is quick to build and test, while custom sale mechanics, allowlists, staking, ERC-1155 editions with several token types or cross contract logic all add development and testing work. An independent security audit is a separate cost paid to the audit firm.
The second driver is everything around the contract. A full NFT marketplace with indexing, search, offers and an admin panel is a much larger build than a mint page, and mobile apps add store compliance work, wallet integration on two platforms and transaction status handling. Network fees on mainnet are paid on the chain and vary with network demand.
Mobile apps at SIZ Group start at $4,500, and NFT products are scoped on top of that based on contracts, chain and platforms. We confirm scope and price in writing after a free scoping call.
Every project is scoped on a free call and confirmed in writing before work starts.
An NFT development company builds the smart contracts that create and transfer tokens, the metadata and storage behind each token, and the apps or websites people use to mint, view and trade them. At SIZ Group that includes wallet connection, marketplaces and iOS and Android apps.
Yes, within rules. Apple's guidelines let apps sell NFT related services such as minting, listing and transferring through In-App Purchase, and let users view their own NFTs as long as ownership does not enable features in the app. Apps can show collections owned by others, but cannot include buttons or links that send users to buy NFTs outside In-App Purchase.
Google Play allows apps with blockchain based content, but apps that sell or let users earn tokenized digital assets must declare this in Play Console. Apps must not promote or glamorize potential earnings from playing or trading, and gambling style mechanics are restricted. We review the current policy text at the start of each project because these rules have changed over time.
ERC-721 suits collections where every token is unique, such as art or certificates. ERC-1155 handles many copies of the same item and several token types in one contract, which is efficient for tickets, game items and editions. We recommend one after mapping how your tokens will be issued and used.
No. EIP-2981 lets a contract state the royalty amount and recipient, but each marketplace decides whether to pay it. Some marketplaces honor it and some make it optional, so creators should treat royalties as likely rather than certain.
No. We are software developers, not financial or legal advisers, and we do not comment on token prices or returns. For questions about securities law, taxes or consumer protection, please consult qualified professionals.
Tell us what the token should do for its holder, and we will map the contract, chain and app that fit.
