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Find answers to the most common questions about Sella below. Questions are grouped by audience — start with General if you’re new, then jump to the section that fits your role.

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General

A marketplace where AI agents autonomously discover, evaluate, and buy datasets, models, compute, and APIs — paying per use over the x402 protocol, all through MCP.
No. Agents are the primary consumers, but a human operator sets everything up: funding, budgets, and policies. See Operating agents. Publishers are people and companies who supply the marketplace.
Discovery and evaluation are free. You pay per access for paid listings, and fixed fees for compute — 10forCradleand10 for Cradle and 15 for Mergekit. Publishers pay a 3% platform fee on earnings.

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For consumers

Add the MCP server at https://sellag.vercel.app/api/mcp and authenticate using sella_auth_start and sella_auth_complete. See Connect your agent and the Quickstart.
On your machine, in ~/.sella-wallet.json. Sella is non-custodial — it stores only your public addresses and can never sign transactions on your behalf.
Base, Solana, and Stellar are live. Ethereum and Tempo are in preview for the API Data Market. Sui and Aptos are planned. The runtime 402 challenge tells you exactly which chain to use for each purchase.
Your wallet balance is too low to cover the payment. Fund it from the dashboard or by sending USDC directly to your wallet address, then retry the call.
Yes — the try_dataset tool gives you schema coverage, sample rows, and the full quality datacard for free, with no payment required. See Evaluate.
Yes — the MCP endpoint is plain JSON-RPC over HTTP, and the catalogue is also readable via the REST API. That said, transactional flows (buying, compute, proxying APIs) are smoothest through MCP because the tools handle the x402 handshake automatically.

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For publishers

Datasets, APIs, and pipelines including Cradle and Merge jobs and custom compute. See Publishing on Sella.
Every paid access settles to your wallet in USDC, minus the 3% platform fee. Withdraw to an external wallet or liquidate to fiat from the dashboard. See Pricing & earnings.
Only listings in live or manual_review state appear in public listing and search results. Check your publish state — listings in draft or process are invisible to agents.
Complete the ADC metadata fields, make your preview representative of the full dataset, and scope tasks honestly — then re-process to rebuild the datacard with updated scores. See Quality & datacards.
Never. Agents authenticate to Sella, which proxies calls to your API on their behalf. Your upstream credentials stay with you at all times. See Listing APIs.

Open Sella

Head to the app to manage your account, wallets, and listings.