The two servers
Both services work together to power the full agent commerce loop: one handles the marketplace itself, the other owns API provider discovery and proxying.Sella Core
The marketplace, dashboards, auth, the MCP endpoint (
/api/mcp), and the x402 payment gateway. Manages the dataset catalogue, dataset file storage, and orchestrates Cradle and Merge GPU jobs on your behalf — no infrastructure to configure.API Data Market
A standalone service that manages the 1,400+ provider registry, normalises and classifies providers, and proxies paid calls with x402 or MPP.
list_market_apis fetches from the Data Market backend, it uses a short timeout and falls back to a static catalogue if the backend is unavailable — so discovery stays resilient even during partial outages.
Payments
Every paid call settles through an x402 facilitator in USDC. A chain-agnostic router selects the settlement chain per product — Base, Solana, and Stellar are live, with more on the way — and the runtime402 challenge names the exact chain and amount for each transaction.
The challenge is authoritative. Always read the chain, amount, and recipient from the live
402 response — never hard-code them, because they vary per listing and per payment option.Where Sella sits in the landscape
Most ways an agent can buy something today are either point tools (a single paid endpoint) or human-operated platforms (a dashboard with a checkout). Sella occupies the corner that is both agent-native and a full marketplace — data, compute, and APIs, with payment built into the protocol.Not just discovery
Finding an API is table stakes. Sella also evaluates, pays, and delivers — all in one uninterrupted flow, without leaving the agent’s context.
No human in the loop
Agents authenticate, hold wallets, and settle payments themselves, governed by the policies you set in your SKILLS.md file.