Creative Blockchain
🎵 Music & Sound Design · live performance loops

STEMSTAMP · Agent Pay

Performers pay to cryptographically stamp loops into a global stem library, while listeners pay per-loop to unlock high-fidelity stems for their own live setups. Live performance isn't just recorded; it's metered and monetized at the moment of inspiration. 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 live performance loops endpoint publishes its own price, so an autonomous agent can pay and retry with no API key — musicians 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.

live performance loops
Live Loop Provenance
Capture and mint unique live-loop sessions for verified creative ownership. Ownership is sealed inside a post-quantum QUIP vault.
sound libraries
FoleyStream · Agent Pay
Sound designers monetize individual transients, hits, and textures without subscriptions. Creators pay-per-sample to bypass licensing friction, while AI music generators use the API to pull stems in real-time. Direct EIP-3009 settlement ensures the Foley artist is paid before the audio buffer even finishes playing. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.
credit attribution
LinerNote · Agent Pay
A global, high-fidelity attribution layer where metadata is a paid event. Instead of static lists, media players and streaming protocols ping this ledger to verify and display the 'Credit Layer' of a track. Truth as a service for the music industry. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.
contest management
STEMWARS · Agent Pay
Submit stems or cast votes in real-time global remix battles. No gatekeepers, just math and melody. The endpoint is priced in USDC over x402, so an autonomous agent can pay for itself without an API key.