# How to connect OpenSea to Hermes Agent (paste one key, 24 tools) > Connect OpenSea to Hermes with ClawLink: paste your OpenSea key once and 24 tools work from chat. No MCP server to run, nothing stored on your machine. Web version: https://claw-link.dev/hermes/open-sea Most guides for giving Hermes Agent OpenSea access start with registering your own OAuth app or pasting API keys into env files, then leave the token refresh and tool wiring to you. ClawLink gives Hermes a more practical OpenSea setup: pair once in the browser and your always-on Hermes agent can act on OpenSea for you, reading and doing real work on your behalf with no auth, token refresh, or tool wiring to build yourself. ## Setup It takes three steps to connect Hermes to OpenSea. 1. **Install ClawLink** — add the plugin to Hermes Agent once. 2. **Connect OpenSea** — one-click OAuth in the ClawLink dashboard. 3. **Use it from chat** — ask Hermes Agent in plain English. **Paste this into Hermes to set up ClawLink:** > Set up ClawLink for Hermes and tell me when it's ready. > 1. Install the plugin: `hermes plugins install ClawLink-HQ/hermes-plugin --enable` > 2. Start pairing with `hermes clawlink begin`. It prints an approval link, so show me the link and stop, don't wait. > 3. I'll approve it in my browser, then reply "approved". > 4. When I say approved, finish setup: `hermes clawlink finish` > 5. Then run `hermes clawlink test` and tell me whether ClawLink is ready. **Alternative for any agent (no plugin needed):** if the Hermes Agent plugin route isn't available or doesn't work, any AI agent with shell access can use the ClawLink CLI instead: ```bash npx -y @useclawlink/cli login # sign in via browser — no API key to paste npx -y @useclawlink/cli connect open-sea # connect OpenSea (browser OAuth) npx -y @useclawlink/cli actions open-sea # list available actions npx -y @useclawlink/cli run open-sea --input '' # execute (add --confirm for writes) ``` ### Install by command The prompt above walks Hermes through this. By hand, it is four commands and a browser approval: ```bash hermes plugins install ClawLink-HQ/hermes-plugin --enable hermes clawlink begin # prints an approval link — open it and approve hermes clawlink finish # after approving in the browser hermes clawlink test ``` Then connect OpenSea in the [ClawLink dashboard](https://claw-link.dev/dashboard) — paste your OpenSea API key once. Verify the connection by asking Hermes: > Use OpenSea to build criteria offer and walk me through the result in plain English. ### Using a different agent? The Hermes plugin is one client of ClawLink's MCP server. Claude Code, Cursor, Codex, or any agent that can run a shell command pairs with the same ClawLink account through the CLI: ```bash npx -y @useclawlink/cli login ``` `login` opens the same browser approval and stores a credential locally. Once OpenSea is connected in the dashboard, that agent calls the same 24 OpenSea tools over MCP. Full setup for MCP clients and shell agents: [connect apps to any AI agent](https://claw-link.dev/learn/connect-apps-to-any-ai-agent). ## OpenSea MCP for Hermes Looking for a OpenSea MCP server for Hermes Agent? ClawLink connects OpenSea to Hermes Agent and exposes 24 OpenSea tools your agent can call over [MCP](https://claw-link.dev/learn/what-is-an-mcp-server), with [hosted auth](https://claw-link.dev/learn/oauth-for-ai-agents) and nothing to run or maintain yourself. Using OpenClaw instead? The [OpenClaw OpenSea integration](https://claw-link.dev/openclaw/open-sea) works the same way. ## What the Hermes Agent OpenSea integration can do 24 OpenSea tools are ready for Hermes Agent once the account is connected. ### All 24 OpenSea tools for Hermes | Tool | What it does | |---|---| | **Build criteria offer** `open_sea_build_criteria_offer` | Build a portion of a criteria offer including the merkle tree needed to post an offer | | **Fulfill listing** `open_sea_fulfill_listing` | Retrieve all the information, including signatures, needed to fulfill a listing directly onchain | | **Fulfill offer** `open_sea_fulfill_offer` | Retrieve all the information, including signatures, needed to fulfill an offer directly onchain | | **Get account** `open_sea_get_account` | Get an OpenSea Account Profile including details such as bio, social media usernames, and | | **Get all listings by collection** `open_sea_get_all_listings_by_collection` | Get all active, valid listings for a single collection | | **Get all offers by collection** `open_sea_get_all_offers_by_collection` | Get all active, valid offers for the specified collection | | **Get best listing by nft** `open_sea_get_best_listing_by_nft` | Get the best listing for an NFT | | **Get best listings by collection** `open_sea_get_best_listings_by_collection` | Get the cheapest priced active, valid listings on a single collection | | **Get best offer by nft** `open_sea_get_best_offer_by_nft` | Get the best offers for an NFT | | **Get collection** `open_sea_get_collection` | Get a single collection including details such as fees, traits, and links | | **Get collection stats** `open_sea_get_collection_stats` | Get stats for a single collection on OpenSea | | **Get collections** `open_sea_get_collections` | Get a list of OpenSea collections with optional filtering and pagination | | **Get contract** `open_sea_get_contract` | Get a smart contract for a given chain and address | | **Get events** `open_sea_get_events` | Get a list of events from OpenSea based on various filters like timestamps and event types | | **Get listings** `open_sea_get_listings` | Get the complete set of active, valid listings | | **Get nft** `open_sea_get_nft` | Get metadata, traits, ownership information, and rarity for a single NFT | | **Get order** `open_sea_get_order` | Get a single order, offer or listing, by its order hash | | **Get payment token** `open_sea_get_payment_token` | Get a smart contract for a given chain and address | | **Get traits** `open_sea_get_traits` | Get the traits in a collection | | **Create criteria offer** `open_sea_create_criteria_offer` | Create a criteria offer to purchase any NFT in a collection or which matches the specified trait | | **Create item offer** `open_sea_create_item_offer` | Create an offer to purchase a single NFT (ERC721 or ERC1155) | | **Create listing** `open_sea_create_listing` | List a single NFT (ERC721 or ERC1155) for sale on the OpenSea marketplace | | **Refresh nft metadata** `open_sea_refresh_nft_metadata` | Refresh metadata for a single NFT | | **Cancel order** `open_sea_cancel_order` | Offchain cancel a single order, offer or listing, by its order hash when protected by the | ## Example prompts **Build Criteria Offer** > Use OpenSea to build criteria offer and walk me through the result in plain English. **Fulfill Listing** > Use OpenSea to fulfill listing and walk me through the result in plain English. **Fulfill Offer** > Use OpenSea to fulfill offer and walk me through the result in plain English. **Get Account** > Pull the relevant data from OpenSea, summarize it in plain English, and point out anything that needs attention. ## ClawLink vs. building it yourself The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want OpenSea working from chat. | | Manual | ClawLink | |---|---|---| | **Credential handling** | Collect, validate, store, and rotate the OpenSea API key yourself, then make sure every tool call uses the right account. | Users complete the hosted ClawLink setup once and the connected OpenSea account becomes available to the agent without you building credential management. | | **Ongoing maintenance** | You own refresh logic, permission debugging, environment config, and every provider-specific edge case for OpenSea. | ClawLink handles the repetitive integration plumbing so your team can focus on the workflow instead of the infrastructure. | | **Agent usability** | You still need to expose the right OpenSea actions to the runtime in a format your agent can reliably use. | 24 tools for OpenSea are already exposed through ClawLink, so the agent can read and act from chat immediately. | ## ClawLink vs. Composio Composio also exposes OpenSea to AI agents. It is developer infrastructure: Python and TypeScript SDKs, an MCP server, and a catalog past 1,000 apps, aimed at teams shipping agent products. ClawLink is built for Hermes Agent users instead. You install the plugin once, connect OpenSea in the browser, and the 24 tools above work from chat. There is no SDK and no config file, and the OpenSea key you paste at setup is stored server-side rather than kept in your environment. Choosing between them? Read the full [Composio alternatives](https://claw-link.dev/hub/composio-alternatives) comparison. ### Hermes paired but still can't use OpenSea Pairing is a two-step handshake: run `hermes clawlink begin`, approve the link in your browser, then run `hermes clawlink finish`. If you ran finish before approving, or the approval link expired, run `hermes clawlink begin` again to get a fresh link. Confirm the plugin was installed with `--enable`, then verify with `hermes clawlink test`. ### Connection succeeds but no tools appear Reconnect OpenSea from the dashboard, then start a fresh chat if the runtime still has the old tool catalog loaded. ### "Tool schema not loaded yet" error when calling OpenSea tools OpenSea tool schemas load on demand the first time a tool runs and are cached after that, so this error usually clears on its own: wait a few seconds and retry the same request. If every OpenSea call keeps failing with it in a fresh chat, reconnect from the dashboard, and contact support if it still persists — that pattern points to a configuration problem on our side, not something you can fix by reconnecting again. ### OpenSea returns 403 or "permission denied" on one action while others work Two usual causes. The connected account may not have access to the specific workspace, inbox, store, or project in the request — check that first. If access looks right, the agent may have sent a placeholder value (like "YOUR_ID" or an example id from documentation) instead of a real one: ask it to run a list or search tool first, then retry the action with a real id from those results. Most failures at this stage are one of these two, not ClawLink bugs. ### API key setup works but results look incomplete Double-check that the API key for OpenSea has the right scopes or account access. A valid key can still be too limited for some reads or writes. ### Is there a Hermes Agent OpenSea integration? Yes. ClawLink is the fastest way to connect Hermes to OpenSea: link your OpenSea account once in the browser and Hermes Agent can call the OpenSea API through 24 ready-made tools — no custom code or token handling. ### How do I connect OpenSea to Hermes with ClawLink? Install the plugin with `hermes plugins install ClawLink-HQ/hermes-plugin --enable`, then pair once: run `hermes clawlink begin`, approve the link in your browser, and run `hermes clawlink finish`. Connect OpenSea in the dashboard and Hermes can use it from the next message — no config files, and the OpenSea key you paste is stored server-side instead of in your environment. ### How long does it take to connect OpenSea to Hermes Agent? About two minutes. Sign in, click Connect next to OpenSea in the dashboard, authenticate, and Hermes Agent can use it from the next chat message. ### Why use ClawLink instead of wiring OpenSea up myself? The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want OpenSea working from chat. ### Hermes paired but still can't use OpenSea Pairing is a two-step handshake: run `hermes clawlink begin`, approve the link in your browser, then run `hermes clawlink finish`. If you ran finish before approving, or the approval link expired, run `hermes clawlink begin` again to get a fresh link. Confirm the plugin was installed with `--enable`, then verify with `hermes clawlink test`. ## Related - [Hermes Stripe integration](https://claw-link.dev/hermes/stripe) — Manage payments, customers, and invoices - [Zoho Books tools](https://claw-link.dev/hermes/zoho-books) — Organize finances, invoices, bills, and accounting - [Ramp](https://claw-link.dev/hermes/ramp) — Read cards, transactions, bills, and reimbursements, and file receipts