Question 1

What is Spirit Cards?

Accepted Answer

Spirit Cards (SPC) is a collectible creature-card collection on Robinhood Chain (chainId 4663). Cards are not sold blind — they are mined with proof of work, then merged, staked and battled.

Question 2

How does proof-of-work minting work?

Accepted Answer

The miner grinds a keccak256(chainId, core, miner, nonce) hash until it has enough leading zero bits, then calls mine(nonce, useChip) paying the current mint price. The valid hash is recorded on-chain as the card's seed, which deterministically defines its species, element, rarity and stats.

Question 3

Which chain does Spirit Cards run on?

Accepted Answer

Robinhood Chain (chainId 4663), an Arbitrum-Orbit L2 with ETH as the gas and payment token. The collection is ERC-721 with ERC-2981 royalties; a companion ERC-1155 chip token gives mint discounts.

Question 4

Can AI agents use Spirit Cards?

Accepted Answer

Yes. A read-only MCP server at /api/mcp exposes 9 tools (stats, cards, nonce verification and grinding, pool, leaderboard), machine-readable datasets are at /api/points and /stats/current.json, and agents can self-register with a wallet signature via POST /api/points/register — no accounts or API keys.

Question 5

Does it cost money to start?

Accepted Answer

Grinding the proof-of-work hash is free and runs in the browser. Minting a card costs the current mint price in ETH on Robinhood Chain; staking pays pool dividends and PvP duels are optional.

Card #857