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Build, register, and gate AI-callable tool endpoints using the OpenSea Tool Registry (ERC-8257) on Base. Scaffold HTTPS tools with JSON Schema interfaces, register them onchain, gate access via NFT ownership or x402 pay-per-call (USDC), and call gated tools. For querying OpenSea marketplace data use opensea-api instead.
Passed 22 of 22 test cases with the skill, and 6 of 22 without it.
and 17 more in the full report
16 fixed6 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 16 test cases the skill fixed. Same model, same prompt, with and without the skill.
What is the deployed smart contract address of the ToolRegistry (v0.1) on Base mainnet?
| Checked | Without skill | With skill |
|---|---|---|
| Identifies 0x7291BbFbC368C2D478eCe1eA30de31F612a34856 as the Base ToolRegistry address | Missed | Passed |
The instructions your model reads when the skill loads.
Build, register, and gate AI-callable tool endpoints using the OpenSea Tool Registry (ERC-8257) on Base.
scope_in)Use opensea-tool-sdk when you need to:
.well-known manifest) for Vercel, Cloudflare, or ExpressauthenticatedFetch), 402 payments (paidFetch), or both (paidAuthenticatedFetch)scope_out, handoff)| Need | Use instead |
|---|---|
| Query NFT/token data, search, collection stats | opensea-api |
| Buy/sell NFTs | opensea-marketplace |
| Swap ERC20 tokens | opensea-swaps |
| Set up wallet signing providers | opensea-wallet |
This SDK is for tool providers and consumers. To query OpenSea marketplace data (floor prices, listings, trades), use the opensea-api skill instead.
| Term | Meaning |
|---|---|
| Tool | An HTTPS endpoint with a JSON Schema interface, discoverable via /.well-known/ai-tool/<slug>.json |
| Manifest | JCS-canonicalized JSON describing the tool's name, endpoint, inputs, outputs, pricing, and access policy |
| ToolRegistry | Onchain contract (Base) where tools are registered with a manifest hash and optional access predicate |
| Access Predicate | An IAccessPredicate contract that gates who can invoke a tool (NFT ownership, subscriptions, composites) |
| x402 | HTTP 402-based pay-per-call protocol (caller signs a USDC TransferWithAuthorization; server settles after execution) |
| SIWE | Sign-In with Ethereum (EIP-4361), used to authenticate callers for predicate-gated tools |
| Facilitator | Third-party service that verifies and settles x402 payments (PayAI or Coinbase CDP) |
| Contract | Address |
|---|
test cases passed, vs 6 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.