Creative Blockchain
🎨 Visual Art · secure sketch storage

SovereignDraw · Agent Pay

A high-fidelity archival layer for digital artists. Grant temporary viewing access to collectors or collaborators for a single micropayment per session. No subscriptions, just a secure ledger of your creative process. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.

x402 track · paid unlockAgent-payable endpoint· machine payments
Section · Onchain

The primitive.

full primer →

The secure sketch storage endpoint publishes its own price, so an autonomous agent can pay and retry with no API key — painters watch a machine buy the answer beside a human doing the same thing.

Why this primitiveLoading details…

Kernel
an endpoint whose price, asset and payee are published in its own 402 response, so an autonomous agent can discover the terms, pay in USDC and retry with no API key and no signup
Drives the UI as
a side-by-side view of the human client and an in-page agent running the same request → 402 → pay → retry loop
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.

secure sketch storage
SketchVault
Offer painters a gasless, onchain-secured vault for storing and sharing preliminary sketches with social login. Every action is signed with a fresh WOTS+ one-time key.
color authenticity validation
TrueHue · Agent Pay
A protocol for true-spectrum validation. The app hashes hexadecimal sequences against high-resolution pixel data, creating a permanent on-chain record of authenticity that prevents color-shifting theft or AI-generated replicas. Pay-per-certification for artists; pay-per-verification for collectors. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.
peer-to-peer art exchange
CanvasSwap · Agent Pay
Curate and trade digital canvases where every view, bid, and swap is metered via micropayments. Settlement occurs instantly, turning low-fidelity discovery into high-signal liquidity. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.
peer review logging
Critiq · Agent Pay
Turn the 'starving artist' trope into a high-fidelity feedback loop. Critiq operates as a metered critique engine where every peer review, redline, or technical teardown is a paid micro-transaction. Every critique is a signed EIP-3009 receipt, creating a verifiable provenance of an artist's growth. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.