# Demeter

> Managed Ogmios, Kupo, Blockfrost and UTxO RPC on mainnet, preprod and preview. Serverless and multi-tenant: you pay per request, reserve throughput when you need it, and $0 when nothing is calling.

## Start here

- [Demeter docs](https://demeter.run/docs/index.md): Demeter runs managed Cardano APIs, called ports, on mainnet, preprod and preview. You create a port in the Console, and it gives you an endpoint and an API key that work with the open-source clients you already use.

## Ports

- [Blockfrost](https://demeter.run/docs/blockfrost.md): A Blockfrost-compatible REST API for Cardano, hosted by Demeter.
- [Kupo](https://demeter.run/docs/kupo.md): The Kupo chain-index HTTP API for Cardano, hosted by Demeter.
- [Ogmios](https://demeter.run/docs/ogmios.md): The Ogmios JSON-RPC bridge to a Cardano node, hosted by Demeter.
- [UTxO RPC](https://demeter.run/docs/utxorpc.md): The UTxO RPC gRPC interface for Cardano, hosted by Demeter.
- [TRP](https://demeter.run/docs/trp.md): The Transaction Resolve Protocol endpoint for tx3, hosted by Demeter.

## Pricing

- [Pricing](https://demeter.run/pricing.md): Every Demeter port and plan side by side. Usage is metered per port, idle usage costs $0, and switching plan or port never changes your endpoints.
- [Free tier](https://demeter.run/free-tier.md): The Demeter free tier: every API on mainnet and testnets, usable right away with no credit card. Enroll your project in the free-tier program within 30 days to keep it.

## For agents

- [Agent Skill: demeter-ports](https://demeter.run/.well-known/agent-skills/demeter-ports/SKILL.md): Call Cardano APIs (Blockfrost, Kupo, Ogmios, UTxO RPC, TRP) hosted by Demeter, with the right host, API key placement and client setup.
- [API catalog](https://demeter.run/.well-known/api-catalog): RFC 9727 linkset for Demeter's management API, the gRPC API the Console uses to create projects, ports and keys.
- [auth.md](https://demeter.run/auth.md): How a coding agent gets a Free testnet port with no account, and hands the claim to its person.