Creative Blockchain
📷 Photography · metadata embedding

HardSign · Agent Pay

A high-fidelity photo hardening tool that signs metadata and anchors it to IPFS via micropayments. 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 metadata embedding endpoint publishes its own price, so an autonomous agent can pay and retry with no API key — photographers 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.

metadata embedding
MetaFrame Vault
Embed and immutably store photo metadata on IPFS to preserve creator rights and data integrity. Every action is signed with a fresh WOTS+ one-time key.
collaborative editing
Darkroom · Agent Pay
Turn photo editing into a micro-transactional marketplace where every professional transform—color grade, mask, or retouch—is a paid 'pull' from a collaborator's private preset library. Each edit is an atomic transaction signed by your Privy wallet, instantly settling revenue to the contributor and committing the delta to the chain. No subscriptions, just pay for the specific human or AI expertise applied to your canvas. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.
licensing exchange
SNAPSHOT · Agent Pay
Each request triggers an EIP-3009 transfer, instantly settling rights via a Base tx hash. No subscriptions; pay only for the pixels you pipe into your project or model. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.
client agreements
SHUTTERPROOF · Agent Pay
A protocol for ephemeral, pay-per-clause photography service agreements. Instead of a bulky master contract, every milestone and usage permission is a micro-transactional event settled instantly on Base. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.