# Praecise developer platform > The reference, guides and agent endpoints of every Praecise product a program can use today. Every page is generated from what the product itself serves; this was read on 2026-11-14. Every page is also available as Markdown at the same address with .md added. ## Products - [Rivier](https://platform.praecise.com/rivier.md): Rivier runs a business's inbox, contacts, campaigns, shop, bookings, books, content, files, memory and agents. Every action in the dashboard is an API operation with the same name on REST, GraphQL, MCP, the SDK and the CLI. - [Skerry](https://platform.praecise.com/skerry.md): Skerry is an API that instructs regulated providers to move money for businesses: verification, custodied stablecoin wallets, bank accounts, payouts, conversion, and card, bank-debit, stablecoin and bank-transfer payments. Skerry holds no funds and no keys, and cannot sign blockchain transactions. - [Praecise Cloud](https://platform.praecise.com/cloud.md): Praecise Cloud is AI operations infrastructure: apps, agents and models, from hosting to day-to-day operations, concept to production, for one owner up to large scale. Furcate is the open operating system base from Praecise. - [Praecise Inbox](https://platform.praecise.com/inbox.md): Email for people, agents and machines. A person approves an access key for named mailboxes and permissions; software then reads, searches, files and sends mail through REST, MCP or A2A. Every call is recorded where the mailbox's holders can see it. - [Praecise account](https://platform.praecise.com/accounts.md): One Praecise account for every product: sign people in with it, confirm an action with a passkey, be told when they sign out, and manage an account's domains and mailboxes. ## Rivier - [Getting started](https://platform.praecise.com/rivier/guides/getting-started.md): The base address, how to make a key, and a first call with the Authorization header. - [Authentication and tokens](https://platform.praecise.com/rivier/guides/authentication.md): Project keys, short-lived tokens, OAuth for apps and account tokens, with the scopes each one holds. - [MCP](https://platform.praecise.com/rivier/guides/mcp.md): Connect an AI agent to Rivier over the Model Context Protocol with one address and a key. - [GraphQL](https://platform.praecise.com/rivier/guides/graphql.md): One endpoint for reads and writes across areas, with the same keys and scopes as REST. - [Command line and SDK](https://platform.praecise.com/rivier/guides/cli.md): The rivier command and the TypeScript client, both generated from the same operation list. - [Events and webhooks](https://platform.praecise.com/rivier/guides/events.md): Read what happened as a stream, or have signed events sent to your own https endpoint. - [Errors and limits](https://platform.praecise.com/rivier/guides/errors.md): What a refusal looks like, the status codes, rate limits, retries and repeat-safe writes. - [Search the web](https://platform.praecise.com/rivier/guides/search.md): Passages from the web that match a question, each with the page it came from. - [Answer a question](https://platform.praecise.com/rivier/guides/answer.md): One answer to a question, with a numbered source for every claim it makes. - [Research a topic](https://platform.praecise.com/rivier/guides/research.md): A longer run that answers, looks for what is missing, reads more and answers again. - [Watch a question](https://platform.praecise.com/rivier/guides/monitor.md): Keep a question on watch and be told when its answer changes. - [AI search discovery](https://platform.praecise.com/rivier/guides/discovery.md): Measure how AI search engines see your site, with one script tag and an audit. - [Reference](https://platform.praecise.com/rivier/reference.md): 2108 operations in 25 groups - [OpenAPI document](https://api.rivier.ai/v1/openapi.json): served by the product - [Agent endpoint (MCP)](https://api.rivier.ai/mcp) - [Rivier's own llms.txt](https://platform.praecise.com/rivier/llms.txt) ## Skerry - [Skerry, for agents](https://platform.praecise.com/skerry/guides/agents.md) - [Reference](https://platform.praecise.com/skerry/reference.md): 255 operations in 27 groups - [OpenAPI document](https://api.skerry.xyz/openapi.json): served by the product - [Agent endpoint (MCP)](https://mcp.skerry.xyz/mcp): 227 tools, listed at https://platform.praecise.com/skerry/agents.md - [Skerry's own llms.txt](https://platform.praecise.com/skerry/llms.txt) ## Praecise Cloud - [Getting started](https://platform.praecise.com/cloud/guides/getting-started.md): Get an account, open the Cloud section of Praecise Spaces and deploy your first project on Praecise Cloud. - [Deploying and rolling back](https://platform.praecise.com/cloud/guides/deploying.md): What happens when you deploy on Praecise Cloud, and how an earlier release is served again. - [Domains](https://platform.praecise.com/cloud/guides/domains.md): Serve a site on your own domain on Praecise Cloud, with a certificate and an address before the domain is attached. - [Security defaults](https://platform.praecise.com/cloud/guides/security-defaults.md): The defaults Praecise Cloud applies: access per project, settings outside releases, isolated agents and signed updates. - [Agents and llms.txt](https://platform.praecise.com/cloud/guides/agents.md): How an agent reads Praecise Cloud through llms.txt and markdown pages, and how a Harness app describes itself to other agents. - [Reference](https://platform.praecise.com/cloud/reference.md): 14 operations in 3 groups - [OpenAPI document](https://console.praecise.cloud/api/openapi.json): served by the product - [Agent endpoint (MCP)](https://console.praecise.cloud/mcp) - [Praecise Cloud's own llms.txt](https://platform.praecise.com/cloud/llms.txt) ## Praecise Inbox - [Reference](https://platform.praecise.com/inbox/reference.md): 9 operations in 2 groups - [OpenAPI document](https://email.inbox.praecise.com/api/openapi.json): served by the product - [Agent endpoint (MCP)](https://email.inbox.praecise.com/mcp): 10 tools, listed at https://platform.praecise.com/inbox/agents.md - [Praecise Inbox's own llms.txt](https://platform.praecise.com/inbox/llms.txt) ## Praecise account - [Quickstart: a first call](https://platform.praecise.com/accounts/guides/quickstart.md): Get a service token, call /api/me, read the answer. - [Tutorial: sign in with the Praecise account](https://platform.praecise.com/accounts/guides/tutorial.md): A product that signs people in through Praecise, step by step, with working code. - [Signing people in](https://platform.praecise.com/accounts/guides/sign-in.md): The reference for products: the request, the ID token, passkeys, sign-out and logout tokens. - [Machines, agents and assistants](https://platform.praecise.com/accounts/guides/agents.md): The device grant, agent clients, assistants acting for a person, and APIs that accept these tokens. - [The shared services and tokens for an API](https://platform.praecise.com/accounts/guides/api.md): Domains, mailboxes, service tokens, and access tokens for an API with a claims hook. - [Reference](https://platform.praecise.com/accounts/reference.md): 11 operations in 4 groups - [OpenAPI document](https://accounts.praecise.com/openapi.json): served by the product - [Sign-in endpoints](https://platform.praecise.com/accounts/sign-in.md): OpenID Connect, from the service's discovery document - [Praecise account's own llms.txt](https://platform.praecise.com/accounts/llms.txt)