Creative Blockchain
🎮 Game Design & Interactive Media · character customization

Collectible Avatars · ap2

Mint avatar parts as unique tokens on Hedera testnet, enabling player-owned, tradable character features. The buyer's agent states an IntentMandate with hard caps, the seller answers with a signed CartMandate, and a PaymentMandate carries the Hedera settlement hash back — so an autonomous purchase leaves a signed, auditable trail from intent to receipt.

Agentic commerce on Hedera (A2A · AP2 · UCP)· AP2 mandates
Section · Onchain

The primitive.

full primer →

The onchain primitive runs at the right moment in the flow and surfaces a clear, verifiable result that game designers can act on without web3 jargon.

Why this primitiveAP2 turns 'the agent bought it' into three signed artifacts a human can audit: what was asked for, what was offered, and what was actually paid — each bound to a Hedera transaction anyone can open on HashScan.

Kernel
an agent-to-agent negotiation loop — A2A 0.3 JSON-RPC tasks carrying AP2 Intent / Cart / Payment mandates, or a UCP signed checkout under RFC 9421 — settled with x402 in HBAR or HTS USDC on Hedera testnet and, where authorisation itself is on-chain state, bound by a bespoke mandate-vault contract verified on HashScan
Drives the UI as
an agent flow log that shows the offer, the counter, the signed cart, the mandate check and the settled payment, every artifact linked to HashScan
Appendix · Secrets

Required keys.

HEDERA_OPERATOR_ID
Hedera testnet account id (0.0.xxxxxx). Create and fund it free.
open ↗
HEDERA_OPERATOR_KEY
ECDSA private key for that account, from the Hedera portal dashboard.
open ↗
REOWN_PROJECT_ID
Free project id powering the HashPack pairing modal.
open ↗
HEDERA_RPC_URL
Optional. JSON-RPC relay, defaults to the public Hashio endpoint.
open ↗
PINATA_JWT
Pins images / JSON / manifests to IPFS.
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 mega-prompt…
Hedera testnet HashScan ↗
Appendix · Market

Market sizing.

TAM
$3B
global avatar accessory market
SAM
$1B
blockchain-customizable in-game assets
SOM
$60M
indie games specializing in avatar economies

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

See also

Adjacent entries.

character customization
Collectible Avatars
Mint avatar parts as unique tokens on Hedera testnet, enabling player-owned, tradable character features.
character customization
Kromos · x402
A stateless character-smith where every aesthetic choice—from skin shader to gear mesh—is a 0.01 USDC unlock triggered via signature. Instead of buying a whole NFT, players 'stream' their identity by paying for the specific frame-data and rig-assets they use per session. Developers earn real-time royalties every time a player equips their designed layer, turning character customization into a high-frequency micro-transaction loop.
quest tracking
Onchain Quest Ledger · a2a
Securely log player quest progress and achievements on Hedera testnet to prove in-game milestones. Two agents — a buyer acting for the artist and a seller acting for the rights holder — negotiate this over A2A 0.3 tasks and settle the agreed price in HBAR or HTS USDC, with every turn of the conversation receipted on Hedera.
item distribution
Tokenized Loot Drops · ap2
Distribute rare, verifiable loot as tokens directly through Hedera testnet smart contracts to guarantee authenticity. The buyer's agent states an IntentMandate with hard caps, the seller answers with a signed CartMandate, and a PaymentMandate carries the Hedera settlement hash back — so an autonomous purchase leaves a signed, auditable trail from intent to receipt.