Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
🎮 Game Design & Interactive Media · marketplace integration

Instant NFT Trades II

Buy and sell game NFTs instantly with embedded wallets and zero gas fees.

Spark sats paywall· instant sats payments
Section · Onchain

The primitive.

full primer →

Game designers pay a few sats over Spark (Bitcoin L2) via a single Privy-signed transfer to unlock the marketplace integration; settlement is instant and the merchant confirms via getBalance.

Why this primitiveA Spark sats transfer settles in under a second and is Bitcoin-native — perfect for gating this content behind a one-click, low-friction micropayment.

Kernel
a 'pay N sats on Spark to unlock' gate — the user signs a Spark transfer via Privy, the merchant's wallet observes the transfer via Spark's getBalance/getTransfers, and the endpoint releases the payload
Drives the UI as
a 'pay 100 sats to unlock' button that returns the Spark tx id, the merchant confirmation, and settles instantly
Appendix · Secrets

Required keys.

PRIVY_APP_ID
Privy dashboard → your app. Configure with chainType 'spark' to mint Bitcoin L2 wallets on sign-in.
open ↗
PRIVY_APP_SECRET
Server-side. Required for the merchant Spark wallet to observe incoming sats transfers via the Privy RPC.
open ↗
PINATA_JWT
Pins images / JSON / manifests to IPFS.
open ↗

Add these in your Lovable project under Settings → Secrets before pasting the prompt below.

Appendix · Mega-prompt

The build prompt.

Paste into a fresh Lovable project — it carries its own feature spec, code, setup and checklist. read the build strategy →

loading the build spec…
Open in Lovable ↗mempool.space testnet4 ↗
Appendix · Market

Market sizing.

TAM
$20B
global NFT gaming market
SAM
$4B
indie NFT marketplaces
SOM
$800M
gasless NFT trading services

Indicative figures for hackathon pitches — refine with your own research before raising.

See also

Adjacent entries.

marketplace integration
Instant NFT Trades
Buy and sell game NFTs instantly with embedded wallets and zero gas fees.
multiplayer coordination
Gasless Guilds II
Seamlessly create and join guilds with gas-free onboarding and instant member transactions.
reward distribution
Sponsored Loot Drops II
Distribute in-game rewards directly to players' wallets without any gas fees.
XR social spaces
Privy VR Lobby II
Enter virtual lobbies with gas-free wallet login and seamless social interactions.