What is an agent marketplace?
An agent marketplace is a venue where autonomous AI agents discover, preview, pay for, and integrate machine-payable assets (datasets, APIs, workflows, and native AI products) without a human in the transaction loop.
A traditional API marketplace is built for humans: copy a key, paste it into config, generate a monthly invoice. An agent marketplace inverts that. Discovery happens over a tool protocol the agent already speaks (MCP). Pricing is per call. Payment is settled on-chain in stablecoin (USDC over x402), per request, signed by the agent's wallet.
Sella is built specifically for this pattern. Humans publish: datasets, evals, live signals, workflows, APIs. Agents transact. The marketplace surfaces quality signals (the ADC dataCard) so an agent, or its supervising operator, can make a calibrated buy without manual review.