Creative Blockchain
👗 Fashion & Textile Design · try-on verification

FitCheck · Pay to Verify

A cryptographic proof-of-fit engine. Every try-on is a paid, verifiable event that generates a unique EIP-3009 signed claim of fit accuracy. Anyone can pay 0.01 USDC over x402 to verify someone else's QUIP chain and walk away with a receipt.

x402 track · paid unlockPay-per-verify· verification market
Section · Onchain

The primitive.

full primer →

Whoever needs certainty about a try-on verification — not the creator — pays 0.01 USDC to have the WOTS+ chain replayed, and fashion designers get a signed verdict receipt they can keep.

Why this primitiveLoading details…

Kernel
a paid verification service where a third party — buyer, festival, insurer — pays 0.01 USDC over x402 to have someone else's WOTS+ chain replayed and gets a signed verdict receipt back
Drives the UI as
a verdict panel with pass/fail per nonce, the local browser verification beside the paid one, and a keepable receipt
Appendix · Secrets

Required keys.

METAMASK_PRIVATE_KEY
Deploys the QUIP verifier to your host chain. Fund on Sepolia via the Google Cloud faucet.
open ↗
SEPOLIA_RPC_URL
Host-chain HTTPS RPC endpoint. Any Sepolia provider works.
open ↗
ETHERSCAN_API_KEY
Required for npx hardhat verify after deploy.
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. Make sure all five secrets above are set first. read the build strategy →

Loading the build prompt…
Open in Lovable ↗Sepolia Etherscan ↗
Appendix · Market

Market sizing.

TAM
…
SAM
…
SOM
…

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

See also

Adjacent entries.

try-on verification
Virtual Trychain
Authenticate virtual try-on sessions and purchases transparently for customers and brands. The creator's existing wallet is wrapped with a post-quantum commitment.
recycled textile verification
ThreadTrace · Pay to Verify
A micro-attestation layer for sustainable fashion brands. Designers use these micro-certs to mint 'Verifiable Green' metadata on-chain, while resellers pay per-look-up to verify circularity. No subscriptions, just pay-per-stitch provenance. Anyone can pay 0.01 USDC over x402 to verify someone else's QUIP chain and walk away with a receipt.
eco-label validation
THREADSCAN · Pay to Verify
A pay-per-scan validation layer for the circular economy. Every scan generates a cryptographically signed receipt on Base, turning 'greenwashing' into a financial liability by metering the cost of proof. Anyone can pay 0.01 USDC over x402 to verify someone else's QUIP chain and walk away with a receipt.
batch quality control
ThreadSeal · Pay to Verify
Designers pay per lookup to verify tensile strength, dye-lot consistency, and compliance certificates before cutting patterns. Pay-per-batch eliminates heavy subscription costs for independent ateliers. Anyone can pay 0.01 USDC over x402 to verify someone else's QUIP chain and walk away with a receipt.