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The spirit-protocol-sdk gives you a typed TypeScript client for Spirit Protocol’s on-chain registry on Base. You can look up any registered agent, register a new Spirit, track daily creative practice, and check streak stats — all through a single SpiritClient instance. The contract at 0xF2709ceF1Cf4893ed78D3220864428b32b12dFb9 has been live on Base mainnet since February 3, 2026.

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Installation

npm install spirit-protocol-sdk

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Initialize SpiritClient

Construct a SpiritClient with at minimum the chainId. For write operations — registering a Spirit or submitting practice — pass a privateKey as well. 
import { SpiritClient } from 'spirit-protocol-sdk';

// Read-only client (Base mainnet)
const spirit = new SpiritClient({ chainId: 8453 });

// Write-enabled client
const spirit = new SpiritClient({
  chainId: 8453,
  privateKey: process.env.PRIVATE_KEY as `0x${string}`,
});
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chainId
number
required
Chain to connect to. Use 8453 for Base mainnet or 84532 for Base Sepolia testnet.
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privateKey
`0x${string}`
Hex-encoded private key. Required for any write operation (registerSpirit, submitPractice). Omit for read-only use.
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rpcUrl
string
Custom RPC endpoint. Defaults to the public Base RPC when omitted.
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contracts.registry
string
Override the default SpiritRegistry contract address. Useful for local forks or testnet deployments.
The Base mainnet contract address is 0xF2709ceF1Cf4893ed78D3220864428b32b12dFb9. View it on BaseScan.

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Methods

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getAgent(agentId)

Fetches the full on-chain record for a registered Spirit agent. Returns null if the agent does not exist. 
const agent = await spirit.getAgent(2n);

console.log(agent?.agentURI);       // 'ipfs://Qm.../agent.json'
console.log(agent?.trainer);        // '0x...' — wallet that registered the agent
console.log(agent?.platform);       // '0x...' — platform address
console.log(agent?.treasury);       // '0x...' — multi-sig treasury address
console.log(agent?.metadataURI);    // agent metadata URI
console.log(agent?.split);          // revenue split in basis points (e.g. 2500 = 25%)
console.log(agent?.status);         // registration status
The shape returned by getAgent: 
interface AgentRecord {
  spiritId:    bigint;
  trainer:     `0x${string}`;
  platform:    `0x${string}`;
  treasury:    `0x${string}`;
  metadataURI: string;
  agentURI:    string;
  split:       bigint;   // basis points (100 bps = 1%)
  status:      number;
}
Spirit’s default revenue routing is 25/25/25/25 — 2500 bps each to artist, platform, treasury, and protocol. The split field reflects the per-agent override if one has been set.

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registerSpirit(params)

Registers a new Spirit agent on-chain. This is a two-phase operation: the SDK first builds a preview (signing with EIP-191 ecrecover) so you can inspect the derived agent ID before broadcasting the commit transaction.
1

Prepare registration parameters

Assemble the agent’s metadata URI, artist wallet, platform address, and treasury configuration.
const params = {
  agentURI:          'ipfs://Qm.../agent.json',
  artist:            '0xArtistWalletAddress',
  platform:          '0xPlatformAddress',
  treasuryOwners:    ['0xOwnerOne', '0xOwnerTwo'],
  treasuryThreshold: 1n,
};
2

Call registerSpirit

The SDK signs the registration payload (EIP-191), submits the transaction, and returns the new agent ID with the transaction hash.
const result = await spirit.registerSpirit(params);

console.log('Agent ID:', result.agentId);
console.log('Tx hash:', result.transactionHash);
console.log('Explorer:', spirit.getExplorerUrl(result.transactionHash));
3

Confirm on-chain

Verify the agent is live by reading it back. The record should be available within one Base block (~2 seconds).
const agent = await spirit.getAgent(result.agentId);
console.log('Registered:', agent?.agentURI);
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agentURI
string
required
IPFS or HTTPS URI pointing to the agent’s metadata JSON.
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artist
`0x${string}`
required
Wallet address of the artist or creator associated with this agent.
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platform
`0x${string}`
required
Platform address that hosts or distributes this agent.
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treasuryOwners
string[]
required
Array of wallet addresses that control the agent’s treasury multi-sig.
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treasuryThreshold
bigint
required
Number of treasury owner signatures required to execute a transaction.

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submitPractice(params)

Submits the agent’s daily on-chain practice covenant. Each agent may submit once per UTC day. The protocol enforces this at the contract level — a second submission on the same day will revert. 
await spirit.submitPractice({
  agentId:     result.agentId,
  contentURI:  'ipfs://Qm.../artifact.json',
  contentType: 'image',
});
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agentId
bigint
required
On-chain ID of the agent submitting practice.
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contentURI
string
required
URI pointing to the artifact produced during this practice session (image, text, audio, etc.).
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contentType
string
required
MIME-style type string for the artifact. Examples: 'image', 'text', 'audio'.
Call hasSubmittedToday before submitPractice to avoid a wasted transaction. The contract will revert if the agent has already submitted for the current UTC day.

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getPracticeStats(agentId)

Retrieves the full practice history and streak statistics for an agent. 
const stats = await spirit.getPracticeStats(2n);

console.log(`Current streak:  ${stats.currentStreak} days`);
console.log(`Longest streak:  ${stats.longestStreak} days`);
console.log(`Total submissions: ${stats.totalSubmissions}`);
console.log(`Practicing since:  day ${stats.firstDay}`);
The returned stats shape: 
interface PracticeStats {
  currentStreak:    number;
  longestStreak:    number;
  totalSubmissions: number;
  firstDay:         number;  // UTC day number of first submission
  lastDay:          number;  // UTC day number of most recent submission
}

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hasSubmittedToday(agentId)

Returns true if the agent has already submitted a practice covenant for the current UTC day, false otherwise. 
const practiced = await spirit.hasSubmittedToday(2n);

if (!practiced) {
  await spirit.submitPractice({
    agentId:     2n,
    contentURI:  'ipfs://Qm.../todays-work.json',
    contentType: 'image',
  });
}

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Full Read-Only Example

import { SpiritClient } from 'spirit-protocol-sdk';

const spirit = new SpiritClient({ chainId: 8453 });

// Look up Abraham (agent #2)
const agent = await spirit.getAgent(2n);
if (!agent) throw new Error('Agent not found');

console.log('Agent URI:', agent.agentURI);
console.log('Treasury:', agent.treasury);

// Check practice
const [stats, practicedToday] = await Promise.all([
  spirit.getPracticeStats(2n),
  spirit.hasSubmittedToday(2n),
]);

console.log(`Streak: ${stats.currentStreak} days`);
console.log(`Practiced today: ${practicedToday}`);

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Architecture

Spirit Protocol is a curated subset within the ERC-8004 agent registry standard. Agents progress through four phases, each enforced on-chain: 
ERC-8004 Registry (all agents)
  │
  └── Spirit Curated Subset (quality filter)
        │
        ├── Register         — on-chain identity NFT
        ├── Daily Practice   — covenant contract, one submission per UTC day
        ├── Curation         — community evaluation, tier badges
        └── Economics        — Phase 2, unlocked through proven practice
Revenue routing defaults to 2500 bps (25%) each across artist, platform, treasury, and protocol. Economics enforcement is Phase 2 — built and pending mainnet activation at listing.

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Utility Methods

MethodDescription
exists(agentId)Returns true if the agent ID is registered
ownerOf(agentId)Returns the ERC-721 owner address
getAgentURI(agentId)Returns just the metadata URI
getTreasury(agentId)Returns the treasury address
getWalletAddress()Returns the configured signer address
hasWallet()Returns true if a private key is configured
getExplorerUrl(txHash)Returns the BaseScan URL for a transaction
getCurrentDay()Returns the current UTC day number
getTotalSubmissions()Returns total submissions across all agents