OpenSea Tool SDK

Build, register, and gate AI-callable tool endpoints using the OpenSea Tool Registry (ERC-8257) on Base.

When to use this skill (scope_in)

Use opensea-tool-sdk when you need to:

• Scaffold an AI-callable tool endpoint (HTTPS, JSON Schema, .well-known manifest) for Vercel, Cloudflare, or Express
• Register a tool onchain on the Base ToolRegistry so other agents can discover it
• Gate access via x402 pay-per-call (USDC) or predicates (ERC-721/ERC-1155 ownership, subscriptions, composites)
• Call a gated tool: SIWE auth (authenticatedFetch), 402 payments (paidFetch), or both (paidAuthenticatedFetch)

When NOT to use this skill (scope_out, handoff)

This SDK is for tool providers and consumers. To query OpenSea marketplace data (floor prices, listings, trades), use the opensea-api skill instead.

Concepts

Deployed Contracts (Base mainnet)

1. Create a Tool

1a. Scaffold a project

npx @opensea/tool-sdk init --runtime vercel   # or: cloudflare, express

This generates:

• src/manifest.ts: tool manifest definition
• src/handler.ts: request handler with input/output schemas
• api/index.ts: framework adapter entry point
• public/llms.txt: agent-readable discovery page
• api/well-known/[slug].ts: serves the manifest at /.well-known/ai-tool/<slug>.json

1b. Define the manifest

import { defineManifest } from "@opensea/tool-sdk"

export const manifest = defineManifest({
  name: "My Tool",
  description: "What this tool does",
  endpoint: "https://my-tool.example.com/api",
  creatorAddress: "0xYOUR_WALLET_ADDRESS",
  inputs: {
    type: "object",
    properties: {
      query: { type: "string", description: "Search query" },
    },
    required: ["query"],
  },
  outputs: {
    type: "object",
    properties: {
      result: { type: "string" },
    },
  },
  // Optional: add pricing for x402 paywall (see references/x402.md)
  // pricing: paywall.pricing,
  // Optional: add access requirements (see references/predicate-gating.md)
  // access: { logic: "OR", requirements: [...] },
})

1c. Write the handler

import { createToolHandler } from "@opensea/tool-sdk"
import { z } from "zod/v4"
import { manifest } from "./manifest.js"

const InputSchema = z.object({ query: z.string() })
const OutputSchema = z.object({ result: z.string() })

export const toolHandler = createToolHandler({
  manifest,
  inputSchema: InputSchema,
  outputSchema: OutputSchema,
  // gates: [],  // Add gates here (see references/x402.md and references/predicate-gating.md)
  handler: async (input) => {
    return { result: `Processed: ${input.query}` }
  },
})

1d. Wire up the adapter

Vercel:

import { toVercelHandler } from "@opensea/tool-sdk"
import { toolHandler } from "../src/handler.js"
export default toVercelHandler(toolHandler)

Express:

import { toExpressHandler } from "@opensea/tool-sdk"
import { toolHandler } from "./handler.js"
app.post("/api", toExpressHandler(toolHandler))

Cloudflare Workers:

import { toolHandler } from "./handler.js"
export default { fetch: toolHandler }

2. Register a Tool Onchain

2a. Via CLI

# Set up wallet
export PRIVATE_KEY=0x...
export RPC_URL=https://mainnet.base.org

# Register (open access, no predicate)
npx @opensea/tool-sdk register \
  --metadata https://my-tool.example.com/.well-known/ai-tool/my-tool.json \
  --network base

# Register with NFT gate (ERC-721 collection)
npx @opensea/tool-sdk register \
  --metadata https://my-tool.example.com/.well-known/ai-tool/my-tool.json \
  --network base \
  --nft-gate 0xCOLLECTION_ADDRESS

# Register with a custom access predicate
npx @opensea/tool-sdk register \
  --metadata https://my-tool.example.com/.well-known/ai-tool/my-tool.json \
  --network base \
  --access-predicate 0xPREDICATE_ADDRESS

# Dry run (no transaction)
npx @opensea/tool-sdk register --metadata ... --network base --dry-run

The CLI:

1. Fetches the manifest from --metadata URL
2. Validates the manifest schema
3. Verifies manifest.creatorAddress matches your wallet
4. Computes the JCS keccak256 manifest hash
5. Calls ToolRegistry.registerTool(metadataURI, manifestHash, accessPredicate)
6. Returns the toolId from the ToolRegistered event

2b. Via SDK (programmatic)

import { ToolRegistryClient, computeManifestHash } from "@opensea/tool-sdk"
import { createWalletFromEnv, walletAdapterToClient } from "@opensea/tool-sdk"
import { base } from "viem/chains"

const adapter = createWalletFromEnv()
const walletClient = await walletAdapterToClient(adapter, base)

const registry = new ToolRegistryClient({
  chain: base,
  rpcUrl: "https://mainnet.base.org",
  walletClient,
})

const { toolId, txHash } = await registry.registerTool({
  metadataURI: "https://my-tool.example.com/.well-known/ai-tool/my-tool.json",
  manifest,                                      // your ToolManifest object
  accessPredicate: "0x0000...0000",              // address(0) for open access
})

console.log(`Registered tool ${toolId} in tx ${txHash}`)

3. Gating tool access

Tools can be gated three ways:

For deployed predicate addresses, requirement encodings, and SDK helpers like describeToolAccess / decodeRequirement, see references/known-predicates.md.

4. Wallet Setup

The SDK supports multiple wallet providers via @opensea/wallet-adapters. Set environment variables and the SDK auto-detects the provider. See the opensea-wallet skill for the full provider table, env vars, setup walkthroughs, and signing-policy configuration.

import { createWalletFromEnv } from "@opensea/tool-sdk"

const adapter = createWalletFromEnv()
const address = await adapter.getAddress()

For Bankr (external signer):

import { createBankrAccount } from "@opensea/tool-sdk"

const account = await createBankrAccount("your-bankr-api-key")
// Use with authenticatedFetch or paidAuthenticatedFetch

5. Response Codes

6. Quick Reference: CLI Commands

All CLI commands accept --wallet-provider privy|turnkey|fireblocks|bankr|private-key or auto-detect from env vars.

7. End-to-End Examples

Example A: Free open-access tool

# 1. Scaffold
npx @opensea/tool-sdk init --runtime vercel
# 2. Edit src/manifest.ts and src/handler.ts with your logic
# 3. Deploy
npx @opensea/tool-sdk deploy
# 4. Register (open access)
PRIVATE_KEY=0x... npx @opensea/tool-sdk register \
  --metadata https://my-tool.vercel.app/.well-known/ai-tool/my-tool.json \
  --network base
# 5. Call
curl -X POST https://my-tool.vercel.app/api \
  -H "Content-Type: application/json" \
  -d '{"query": "hello"}'

Example B: x402 paid tool (pay-per-call only, no identity check)

# Server: add paywall gate (see references/x402.md)
# Call via CLI:
PRIVATE_KEY=0x... npx @opensea/tool-sdk pay \
  https://my-tool.vercel.app/api \
  --body '{"query": "hello"}'

Example C: NFT-gated tool (identity check, no payment)

# Register with NFT gate
PRIVATE_KEY=0x... npx @opensea/tool-sdk register \
  --metadata https://my-tool.vercel.app/.well-known/ai-tool/my-tool.json \
  --network base \
  --nft-gate 0xCOLLECTION

# Server: add predicateGate (see references/predicate-gating.md)

# Call via CLI:
PRIVATE_KEY=0x... RPC_URL=https://mainnet.base.org \
  npx @opensea/tool-sdk auth \
  https://my-tool.vercel.app/api \
  --body '{"query": "hello"}'

Example D: NFT-gated and paid tool (both gates)

# Server: add both predicateGate and paywall.gate (see references/predicate-gating.md)
# Call via CLI:
PRIVATE_KEY=0x... RPC_URL=https://mainnet.base.org \
  npx @opensea/tool-sdk smoke \
  --endpoint https://my-tool.vercel.app/api \
  --expect 200

References

• references/x402.md: pay-per-call protocol, server-side paywall, paidFetch
• references/predicate-gating.md: SIWE-based access control, combined gates
• references/known-predicates.md: deployed predicate contracts and SDK helpers
• Tool SDK GitHub