Creative Blockchain
🎵 Music & Sound Design · emotional tagging

MoodSampler · Agent Pay

MoodSampler turns audio tagging into a sovereign high-fidelity label market. Each 'tag' is a micro-settlement that ensures the curator is compensated for their sonic intuition, creating a decentralized database of human-felt sound where every search query and metadata unlock feeds the Base creator ecosystem. 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 emotional tagging 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.

emotional tagging
MoodSampler
Attach permanent mood and emotion tags to samples for easy discovery and curation. 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.