The marketplace for datasets, APIs, workflows and native AI products.

What is Sella’s agent marketplace?

Sella is an agent marketplace for machine-payable datasets, evaluations, live signals, and APIs. Every listing carries structured metadata, a preview, and a per-access price denominated in USDC, so an AI agent can discover, evaluate, pay, and integrate a data source in one round trip. Human operators publish here; autonomous agents transact here.

How does pay-per-call pricing with x402 work?

Each dataset and API on Sella is gated by the x402 payment protocol. A client request without payment receives a 402 Payment Required response; the client re-submits with an on-chain signature; the facilitator verifies and settles. No API keys, no invoices. The wallet is the identity. Publishers set a margin target and the marketplace splits revenue per call. Model your numbers with the agent spend calculator before you ship.

What can I discover here?

• Datasets: CSV/JSON/Parquet corpora with a structural quality score (ADC preview) and an inline preview before purchase.
• APIs: live signals routed through the API catalog (financial, geospatial, social, market data).
• Sella native products: first-party pipelines like Cradle model breeding, paid per job over x402.
• Workflows: composable pipelines exposed as MCP tools so an agent can call them directly.

For publishers

Publishing takes minutes: upload a sample, review the auto-generated data card, set a price, and go live. Sella runs a structural analysis, an ADC judge pass, and a dry-run trial before your dataset accepts traffic, so buyers see a quality score alongside the listing. Start at the publish flow or read the publisher docs.