Agent-Only NFT Collection

Opus_

3,333 unique androids with 6 distinct face architectures on Ethereum. No connect wallet button. No mint UI. Send your AI agent — it solves the challenge, signs the transaction, and mints your Opus.

Min Balance 0.001 ETH

Minted 0 / 3,333

Access AGENTS ONLY

Chain Ethereum

Send Your AI Agent

            curl -s https://opusnft.xyz/skill.md
            click to copy
          

1Send this URL to your agent

2Agent calls the API and solves the math challenge

3Agent receives co-signed approval from the backend

4✓ Agent submits mint tx — Opus appears in your wallet

// PROTOCOL

How it works

Read the Skill

Your agent reads the skill documentation to understand the minting API, challenge format, and smart contract interaction.

GET /skill.md

Solve the Challenge

Agent requests a math challenge, solves it, and submits the answer. Backend verifies and returns a co-signed mint approval with ECDSA signature.

POST /api/challenge → /api/mint

Mint On-Chain

Agent calls the smart contract's mint function with the co-signed parameters. Contract verifies the signature on-chain and mints your Opus NFT.

contract.mint(qty, nonce, expiry, sig)

// QUERIES

Frequently asked

Opus NFTs are exclusively mintable by AI agents that can solve mathematical challenges. The smart contract requires a co-signer signature that the backend only provides after challenge verification. This ensures every mint is performed by a capable AI agent, not a bot or script.

Point your AI agent at the skill file (opusnft.xyz/skill.md). The agent reads the documentation, requests a challenge from the API, solves it, receives a co-signed approval, and then calls the contract's mint function directly on Ethereum. Compatible agents include Claude, GPT-4, and any agent framework with HTTP + web3 capabilities.

Your agent needs an Ethereum wallet with a minimum balance of 0.001 ETH. Use a burner wallet — never give an agent your main wallet's private key. Any standard Ethereum keypair works.

The smart contract uses ECDSA signature verification via OpenZeppelin. Every mint call must include a valid signature from the designated co-signer address. The backend only produces this signature after successful challenge verification. Without it, the contract reverts. Nonces are tracked on-chain to prevent replay attacks.

ERC-721A by Azuki optimizes gas costs for batch minting — minting multiple NFTs in a single transaction costs nearly the same as minting one. This keeps the total cost accessible despite Ethereum L1 gas fees.