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For a one-off auction, a seller can review signed Seaport offers and choose a winner. A platform that needs automatic bid tracking, reserves, extensions, refunds, or settlement must implement those rules in its backend or a dedicated smart contract. OpenSea’s trading guide and Seaport interface documentation describe the relevant operations and limitations.
What an NFT auction actually needs
A normal NFT listing has a simple outcome: a buyer accepts the seller’s stated price. An auction has additional state and rules.
| Requirement | What it does |
|---|---|
| Opening and closing time | Defines when bids can be submitted and when the auction ends. |
| Bid amount | Records the value offered by each participant. |
| Minimum increment | Prevents bids that are only trivially higher than the current bid. |
| Reserve price | Stops the sale if the highest bid does not reach the seller’s minimum. |
| Highest-bid tracking | Identifies the current winner while the auction is open. |
| Bid escrow or authorization | Ensures the winning bidder can pay and losing bidders can recover their funds. |
| Settlement | Transfers the NFT to the winner and payment to the seller after the auction closes. |
| Late-bid extension | Optionally adds time when a bid arrives near the deadline. |
These rules are not supplied by a basic OpenSea fixed-price listing. They must be handled by your auction application, a purpose-built contract, or both.
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How OpenSea and Seaport handle offers
Seaport orders contain offer items and consideration items. An offer can include native currency, ERC-20 tokens, an ERC-721 NFT, or an ERC-1155 item. Consideration specifies what must be received for fulfillment. See OpenSea’s Seaport overview.
In practical terms, a bidder can make an offer for an NFT. OpenSea generates a Seaport order, asks the bidder to sign it, and submits the signed order to the Seaport contract. The offer is not the same as an automatic auction bid. The NFT owner or an application still has to decide whether and when to accept it.
The current OpenSea SDK exposes three relevant operations:
- createListing creates a listing at an amount.
- createOffer creates an offer for an NFT.
- fulfillOrder completes an order, such as buying a listing or accepting an offer.
The SDK’s documented listing example uses a fixed amount; it is not documented as a highest-bid auction. Seaport also supports start and end times and start and end amounts. Different start and end amounts create a linear time-based price change, such as a descending Dutch auction. They do not automatically select the highest bidder. See Seaport order models.
Three workable auction models
1. Manual bidding with OpenSea offers
This is the simplest approach for a small event. Publish the NFT, announce the auction window, and ask participants to submit Seaport offers. At the deadline, the seller reviews the offers and accepts one.
This approach is easy to launch, but the seller or administrator must enforce the rules. OpenSea does not automatically provide a public reserve-price workflow, late-bid extension, losing-bid refunds, or automatic highest-bid settlement for this process.
2. A custom auction application using Seaport orders
A backend can collect signed offers, verify their terms and expiration, display the current highest valid offer, and provide an administrator action for settlement. The final transaction can use fulfillOrder after the seller selects the winner.
This model keeps custody and auction logic in the application. It is suitable when your platform needs its own user interface, countdown, reserve price, bid increments, moderation, or notifications, but does not need every rule enforced by a custom contract.
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A contract can hold the NFT or control its sale, accept bids, record the leading bidder, enforce a reserve, extend the deadline, refund losing bidders, and settle automatically. This provides stronger on-chain enforcement but introduces contract development, audits, deployment costs, wallet compatibility concerns, and responsibility for handling failed payments or stuck funds.
Do not describe a custom contract as an OpenSea feature. OpenSea can display or interact with compatible assets, but the auction behavior belongs to your contract and platform.
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Creating the NFT in OpenSea Studio
For a creator-owned collection, the current Studio path is:
- Open OpenSea and select Studio.
- Choose Create new.
- Select Create Collection.
- Enter the logo image, contract name, and token symbol.
- Choose the blockchain and select Publish Contract.
- Approve the wallet transaction and pay the required gas.
- Open the collection’s Media & Metadata tab.
- Create the NFT and select Mint.
OpenSea’s current Studio collection workflow creates ERC-1155 NFTs. Set supply to 1 for a unique auction item. A higher supply creates multiple copies, which is useful for editions but usually inappropriate for a one-of-one auction. See OpenSea’s collection creation instructions.
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Choose the collection and file type carefully. NFTs cannot be moved between collections after creation, and all NFTs in one Studio collection must use the same file type. To change a minted Studio item, open the Media & Metadata dropdown, choose View/Edit, and select the pencil icon.
Creator-earnings settings are configured after contract deployment. They should be agreed before the auction starts because they affect the seller’s expected proceeds and the marketplace’s transaction economics.
Choosing a contract type for a drop
If the auction starts with a public minting drop rather than an already-minted item, use OpenSea → Studio → Create new → Create Drop. The current workflow offers a default proxy contract and a standard contract.
| Choice | Trade-off |
|---|---|
| Proxy contract | OpenSea estimates deployment at approximately 10% of the gas cost of a standard deployment, but minting, sales, and transfers have additional transaction overhead. |
| Standard contract | Higher deployment cost, but no proxy overhead for later collector transactions. |
OpenSea estimates that proxy savings may be outweighed above roughly 1,500 transactions. This is an estimate, not a guaranteed break-even point; network fees and activity patterns change. See OpenSea’s drop deployment guidance.
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The selected blockchain and token symbol cannot be changed after deployment. The OpenSea collection name and logo can be changed later. Verify those immutable choices before selecting Publish Contract.
Building a bidding backend with the current SDK
The current package is @opensea/sdk, not the older package name often shown in tutorials. The current requirements are Node.js 20 or later and viem 2 or later, or ethers.js 6 or later. See the current buy-and-sell guide.
Install the SDK with viem:
npm install @opensea/sdk viem
A viem-based server initialization looks like this:
import { createPublicClient, createWalletClient, http } from “viem”;
import { mainnet } from “viem/chains”;
import { OpenSeaSDK, Chain } from “@opensea/sdk/viem”;
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const publicClient = createPublicClient({
chain: mainnet,
transport: http(process.env.RPC_URL),
});
const walletClient = createWalletClient({
chain: mainnet,
transport: http(process.env.RPC_URL),
account: process.env.SERVER_WALLET,
});
const sdk = new OpenSeaSDK(
{ publicClient, walletClient },
{ chain: Chain.Mainnet, apiKey: process.env.OPENSEA_API_KEY },
);
Do not put this SDK or the API key in browser or mobile code. A frontend environment variable is still extractable after the application is bundled. Keep the key on the backend, call the SDK from server code, return transaction data to the frontend, and let the user sign with a browser wallet. The SDK README warns against using the SDK directly in client code.
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For a temporary development key, the SDK README documents this command:
curl -s -X POST https://api.opensea.io/api/v2/auth/keys | jq -r ‘.api_key’
The instant key lasts 30 days and the endpoint is limited to three keys per hour per IP. For production, open OpenSea → Settings → Developer or visit opensea.io/settings/developer to create a permanent key. Production keys do not expire, have higher rate limits, and can be rotated.
Creating an offer
The documented SDK offer call is:
const offer = await sdk.createOffer({
asset: {
tokenAddress: “0x…”,
tokenId: “1”,
},
accountAddress: “0x…”,
amount: 0.5,
});
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsYour application should store more than the displayed amount. Record the offerer address, order hash, signed order, currency, expiration, NFT contract, token ID, submission time, and validation status. Normalize amounts using the currency’s smallest unit rather than comparing floating-point numbers in application code.
Before showing an offer as the leader, check that it has not expired, been canceled, been fully filled, or been invalidated by the offerer. A Seaport order can be canceled individually. An offerer can also invalidate all orders associated with the current counter by calling incrementCounter(). See Seaport’s order interface.
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Running the auction logic
A practical server-side workflow is:
- Create an auction record with an NFT contract address, token ID, currency, opening time, closing time, minimum bid, increment, reserve, and settlement status.
- Accept a signed offer only while the auction is open.
- Verify that the offer targets the correct asset and currency and has an expiration beyond the auction deadline.
- Reject bids below the opening amount or below the current bid plus the required increment.
- Persist the signed order and order hash.
- Recheck Seaport order status before announcing a new leader or closing the auction.
- If the platform uses late-bid extensions, move the closing time according to a documented rule, such as adding five minutes to bids received in the final two minutes.
- At closing, verify the reserve price and select the highest valid offer.
- Ask the NFT owner or authorized settlement wallet to fulfill the winning order.
- Mark the auction settled only after the blockchain transaction is confirmed.
Do not rely on the browser countdown as proof that the auction is closed. The backend should use a trusted time source, and the contract should enforce the deadline if the auction is contract-based.
Settling or accepting the winning bid
The current SDK settlement operation is:
await sdk.fulfillOrder({
order,
accountAddress: “0x…”,
});
OpenSea documents fulfillOrder for buying a listing or accepting an offer. The owner’s acceptance creates a corresponding counter-listing; Seaport completes the exchange only if both orders remain valid.
Before calling fulfillment, check the NFT owner, approval state, order status, expiration, and available balance. Seaport provides this status function:
getOrderStatus(bytes32 orderHash)
It returns whether the order is validated, canceled, its total filled amount, and its total size. The offerer’s current counter can be read with:
getCounter(address offerer)
If the seller’s wallet or the bidder’s wallet is a contract wallet, signature validation may use EIP-1271. For approvals, a zero conduitKey sends approvals directly to Seaport; a nonzero key routes them through the specified conduit.
Wallet signatures and approvals
Current OpenSea signature requests come from Seaport. A missing Sign button does not necessarily indicate a failed order: OpenSea notes that the wallet-extension window may require scrolling down. See OpenSea’s typed-signature guidance.
The historical first-time user proxy deployment is no longer required. A wallet may still be asked for token approvals or transaction signatures, depending on the order and asset, but do not add a proxy-deployment step to current instructions unless a specific workflow requires it.
Show users the collection, token ID, amount, currency, expiration, and destination before they sign. Never ask users to sign an unexplained message or enter a seed phrase. A marketplace should also explain whether the signature creates an off-chain order or sends an on-chain transaction.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Reading NFT metadata for the auction page
For a single NFT, the current metadata endpoint is:
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GET https://api.opensea.io/api/v2/chain/{chain}/contract/{address}/nfts/{identifier}
For Ethereum, replace {chain} with ethereum. The request requires the x-api-key header:
curl “https://api.opensea.io/api/v2/chain/ethereum/contract/0xYOUR_CONTRACT/nfts/1”
-H “x-api-key: $OPENSEA_API_KEY”
Handle documented responses including 200, 400, 401, 403, 404, 409, and 500. Cache metadata for display, but treat blockchain ownership and order status as authoritative when deciding whether settlement is possible. See the NFT metadata endpoint reference.
Operational and security checklist
- Define the winner: highest valid bid at the server- or contract-enforced closing time.
- Define ties: use earliest valid bid, a transaction ordering rule, or reject ties explicitly.
- Define refunds: specify whether funds are merely authorized, held by a contract, or sent directly to the seller.
- Protect against double settlement: use an idempotent auction status and record the settlement transaction hash.
- Recheck ownership: the seller may transfer or list the NFT elsewhere before the auction ends.
- Handle cancellation: show canceled, expired, invalidated, and fulfilled orders separately.
- Protect the API key: keep it in backend secrets, apply rate limits, and rotate it if exposed.
- Audit contracts: a custom auction contract controls user funds and should be independently reviewed before launch.
- Explain fees: include gas, marketplace fees, creator earnings, and the auction currency in the interface.
- Test failure paths: test an underbid, expired offer, canceled order, disconnected wallet, failed fulfillment, reserve not met, and a bid near the deadline.
What OpenSea is and is not providing
OpenSea provides NFT contracts and marketplace infrastructure that can support listings and offers. Seaport provides a flexible order and fulfillment protocol. Neither fact alone gives your platform an automatic live auction with escrow, reserve handling, extensions, refunds, and highest-bid settlement.
For a one-off auction, manually reviewing signed Seaport offers may be enough. For a public platform, put auction rules in a backend or dedicated contract, make the rules visible before bidding, and treat order validation and blockchain confirmation as part of the settlement process rather than relying only on the user interface.
FAQ
Can I create a highest-bid auction directly with OpenSea’s current SDK?
Not as a documented native auction operation. The current SDK documents createListing, createOffer, and fulfillOrder. You can collect offers and accept one, but automatic highest-bid tracking and auction settlement require application logic or an auction-specific smart contract.
Is a Seaport listing an on-chain auction?
No. A listing is an order describing what can be bought and what the seller receives. Seaport supports time-based orders and offers, but a listing does not automatically compare bids or choose the highest bidder.
Which OpenSea Studio option creates a unique NFT?
Create a collection through OpenSea → Studio → Create new → Create Collection, then set the ERC-1155 supply to 1 when minting. A higher supply creates multiple copies.
Can an NFT be moved to another OpenSea collection later?
No. NFTs cannot be moved between collections after creation, so check the collection and file type before minting.
Where should the OpenSea API key be stored?
Store it on a backend server or other protected server-side environment. Do not initialize the SDK in browser or mobile code because users can extract bundled API keys.
Do OpenSea users still need a first-time proxy deployment?
OpenSea’s current typed-signature guidance says the historical first-time user proxy deployment is no longer needed. Users may still need normal approvals or signatures for particular assets and orders.
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The Bottom Line
Use an NFT to identify the auctioned asset, but build the auction separately from the basic OpenSea listing flow. OpenSea and Seaport can provide signed offers and fulfillment; your backend or smart contract must enforce the rules that make those offers an actual auction.
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