# Chromia > Chromia is a public Layer-1 relational blockchain: apps and AI agents store data in real tables (PostgreSQL under EBFT consensus), each app on its own chain; users pay no gas. Mainnet since July 2024. Positioning: the security data layer for AI agents. Facts are sourced on /sources/. ## Start building - [Docs](https://docs.chromia.com/) - [Install the chr CLI](https://docs.chromia.com/get-started/installation/) - [Run a dapp, step by step](https://docs.chromia.com/get-started/create-dapp/run-dapp-cli/) - [Rell in 10 minutes](https://docs.chromia.com/rell/rell-intro/) - [Client SDKs](https://docs.chromia.com/build/clients/overview/) - [MCP server for agents](https://docs.chromia.com/build/clients/mcp-server/) - [Hello world template](https://github.com/ChromiaProject/hello-world-chromia) - [Learn: courses](https://chromia.com/learn/) ## Explorer (live mainnet) - [Chromia Explorer](https://chromia.com/explorer/): running chains, latest blocks and transactions, read live from mainnet nodes. - [Network: clusters, providers, nodes](https://chromia.com/explorer/network) - [FT4 assets](https://chromia.com/explorer/assets) - [CHR supply, staking and price oracle](https://chromia.com/explorer/chr) - Deep links: /explorer/chain/, /explorer/chain//block/, /explorer/chain//tx/, /explorer/chain//account/, /explorer/chain//asset/, /explorer/search?q= - JSON API used by the explorer (read-only, cached): /api/x/overview, /api/x/c//blocks, /api/x/c//txs, /api/x/c//block/, /api/x/c//tx/, /api/x/search?q= ## Pages - [Chromia: the database nobody can fake](https://chromia.com/): Chromia is a public blockchain that stores data in real tables, so apps and AI agents keep records anyone can check. Users pay no gas. - [About Chromia: story, team and sources](https://chromia.com/about/): From ChromaWay in 2014 to a relational blockchain on mainnet since July 2024: our story, the team, how to reach us and the source of every figure. - [Chromia blog: updates, releases and ideas](https://chromia.com/blog/): Monthly updates, releases and ideas from the Chromia team. Every post here is a real post on blog.chromia.com, listed with its date. - [Chromia community: Discord, Telegram, X and code](https://chromia.com/community/): Join the Chromia community: Discord for developers, Telegram, X for news, and GitLab and GitHub for the code. Ask questions and share what you build. - [Build on Chromia: Rell, chr CLI, SDKs and courses](https://chromia.com/developers/): Start building on Chromia: hello world in four commands, Rell by example, the chr CLI, SDKs, a docs map, free courses, AI tools and grants. - [Chromia ecosystem: apps live on mainnet](https://chromia.com/ecosystem/): My Neighbor Alice, EVAL Engine, Chromia Pay, Filehub, ATBASH and more: apps live on Chromia mainnet, each on a chain of its own. - [How Chromia works: the relational blockchain](https://chromia.com/how-it-works/): How Chromia works: PostgreSQL tables under EBFT consensus, one chain per app, final in one to two seconds, with a three-layer anchoring hierarchy. - [Learn Chromia: docs, courses and reference](https://chromia.com/learn/): every official Chromia doc, course and reference in seven steps. Official docs: https://docs.chromia.com/ (machine-readable: https://docs.chromia.com/llms.txt). - [Chromia vs Ethereum vs Solana](https://chromia.com/compare/): fees, storage cost, SQL querying, data storage, language and finality compared; every figure sourced and dated. - [Chromia network: chains, providers and nodes](https://chromia.com/network/): Chromia mainnet by its own numbers: 44 chains, 19 node providers and 35 nodes in 11 countries, read from the directory chain. - [CHR token: what it does, supply and staking](https://chromia.com/token/): CHR pays for capacity on Chromia, pays the node providers and secures the network by staking. Fixed supply, how to stake, and the CHR 2.0 proposal. - [CHR 2.0 proposal: fixed daily issuance, providers first](https://chromia.com/chr-2/): The September 2026 CHR 2.0 proposal: 125,000 CHR a day, providers paid first, the residual split between the Foundation and a Community Pool that pays stakers and burns. Not ratified. - [CHR 2.0 supply simulator](https://chromia.com/chr-2/simulator/): Explore what the CHR 2.0 proposal does to supply: set CHR price, adoption, fee revenue and provider costs and watch supply to 2046. A mechanism explorer, not a forecast. - [Fly through Chromia](https://chromia.com/world/): The network, the agent checkpoint, shielded assets, the live apps and CHR: Chromia, stop by stop. - [Ask Chromia: chat](https://chromia.com/chat/): Ask Chromia anything: ask the docs, use the hosted Unbound chat, or run EVAL Engine models yourself. - [Chromia use cases: AI agents, gaming, data, payments](https://chromia.com/use-cases/): What runs on Chromia: AI agents with verifiable records, games with on-chain items, shared data tables, CHR payments and permanent file storage. ## Live data - Live query demo on the home page (https://chromia.com/#try): runs read-only Rell queries on Chromia mainnet. API: GET /api/query?chain=&type=&args=, GET /api/chains, GET /api/structure?chain=, GET /api/costs. ## Key facts - Mainnet since July 2024; ~2 s finality (EBFT, >2/3 of signers); one chain per dapp, own container. - CHR: native token; max supply 978,064,789; stake native CHR in Chromia Vault, 14-day unbonding. CHR 2.0 is a proposal, not ratified. - Apps live on mainnet include My Neighbor Alice, EVAL Engine, Chromia Pay and ATBASH. ## Machine-readable - Every page has a Markdown twin: add `index.md` to any URL (e.g. https://chromia.com/developers/index.md). - [llms-full.txt](https://chromia.com/llms-full.txt): every page in one file. - [sitemap.xml](https://chromia.com/sitemap.xml): all 260 pages. - Live JSON: /api/network (directory-chain summary), /api/ledger (latest blocks on 6 mainnet chains). ## Learn: free courses - [Associate function](https://chromia.com/learn/associate-function/) - [Big data](https://chromia.com/learn/big-data/) - [Book review](https://chromia.com/learn/book-review/) - [Chat agent course](https://chromia.com/learn/chat-agent-course/) - [Chromia comparisons](https://chromia.com/learn/chromia-comparisons/) - [Chromia for evm developers](https://chromia.com/learn/chromia-for-evm-developers/) - [Chromia goat chat agent](https://chromia.com/learn/chromia-goat-chat-agent/) - [Continuous integration](https://chromia.com/learn/continuous-integration/) - [Continuous integration deploy](https://chromia.com/learn/continuous-integration-deploy/) - [Ft4 asset](https://chromia.com/learn/ft4-asset/) - [Ft4 demo app](https://chromia.com/learn/ft4-demo-app/) - [Iccf course](https://chromia.com/learn/iccf-course/) - [Icmf course](https://chromia.com/learn/icmf-course/) - [Latest known time](https://chromia.com/learn/latest-known-time/) - [Marketplace course](https://chromia.com/learn/marketplace-course/) - [Monetize dapp](https://chromia.com/learn/monetize-dapp/) - [My news feed](https://chromia.com/learn/my-news-feed/) - [Random number generation](https://chromia.com/learn/random-number-generation/) - [Relationships course](https://chromia.com/learn/relationships-course/) - [Rell integration test](https://chromia.com/learn/rell-integration-test/) - [Rell masterclass](https://chromia.com/learn/rell-masterclass/) - [Tic tac toe](https://chromia.com/learn/tic-tac-toe/) - [Vector db movie demo](https://chromia.com/learn/vector-db-movie-demo/) - [Web3 for web2 devs](https://chromia.com/learn/web3-for-web2-devs/) - [Zero knowledge proof](https://chromia.com/learn/zero-knowledge-proof/)