# Developer Portal

> Developer portal for Flare — quickstarts, API docs, OpenAPI, authentication, sandbox, and MCP.

> For the complete documentation index, see [llms.txt](/llms.txt). Markdown versions of documentation pages are available by appending `.md` to the page URL.

Source: https://dev.flare.network/developers

This page is the curated entry point for building on Flare and for AI agents that need API docs, authentication guidance, sandbox endpoints, and machine-readable specs.

Flare Developer Hub documents Flare Mainnet (chain ID `14`) and Coston2 (chain ID `114`), as well as Songbird (chain ID `19`) and Coston (chain ID `16`), where relevant. Prefer **Coston2** for dApp examples and use the [ContractRegistry](/network/guides/flare-contracts-registry) pattern instead of hardcoding protocol addresses.

## Quickstarts[​](#quickstarts "Direct link to Quickstarts")

-   [Deploy your first contract](/network/getting-started) — browser-based deploy on Flare.
-   [Hardhat or Foundry starter kits](/network/guides/hardhat-foundry-starter-kit) — local tooling and deploy workflows.
-   [FTSOv2 price feeds](/ftso/getting-started) — onchain market data from the Flare Time Series Oracle.
-   [FDC attestations](/fdc/getting-started) — verify external chain and Web2 data onchain.
-   [FAssets / FXRP](/fassets/overview) — bring XRP, BTC, and similar assets into Flare DeFi.
-   [Smart Accounts](/smart-accounts/overview) — account abstraction for XRPL users on Flare.

## API documentation[​](#api-documentation "Direct link to API documentation")

Resource

URL

Purpose

**DA Layer OpenAPI**

[`/openapi/data-availability-api.yaml`](/openapi/data-availability-api.yaml)

Data Availability Client API (FTSO/FDC proofs)

**Network overview**

[/network/overview](/network/overview)

RPC endpoints, explorers, faucets, and API base URLs

**Authentication**

[/developers#authentication](#authentication)

Optional API keys for higher DA/verifier rate limits

Interactive Swagger for the Data Availability API is embedded in the [FDC DA API reference](/fdc/reference/data-availability-api) and [FTSO scaling DA API reference](/ftso/scaling/solidity-reference/data-availability-api). Markdown mirrors of those pages expand the same OpenAPI spec into endpoint tables for agents.

## Authentication[​](#authentication "Direct link to Authentication")

Public Flare HTTP APIs (Data Availability Layer and FDC verifiers) accept an optional **API key** via the `X-API-Key` header. Without a key, endpoints remain usable at public rate limits. With a key, rate limits increase.

Request a higher-limit DA Layer key by opening an [API Key Request](https://github.com/flare-foundation/developer-hub/issues/new/choose) issue. A public test verifier key (`00000000-0000-0000-0000-000000000000`) is documented on the [network overview](/network/overview) and in [FAQs](/support/faqs).

The Developer Hub itself is a static documentation site. Doc search and page fetch for agents use the [MCP server](#ai-agents-and-mcp), not a separate Hub REST API.

## Sandbox environment[​](#sandbox-environment "Direct link to Sandbox environment")

Use **Coston2** as the primary developer sandbox:

Item

Value

RPC

`https://coston2-api.flare.network/ext/C/rpc`

Chain ID

`114`

Explorer

[coston2-explorer.flare.network](https://coston2-explorer.flare.network)

Faucet

[faucet.flare.network/coston2](https://faucet.flare.network/coston2) — C2FLR, FXRP, USDT0

DA Layer

`https://ctn2-data-availability.flare.network/`

FDC verifiers

`https://fdc-verifiers-testnet.flare.network/`

## AI agents and MCP[​](#ai-agents-and-mcp "Direct link to AI agents and MCP")

-   **MCP (Streamable HTTP):** `https://dev.flare.network/mcp` — tools `docs_search` and `docs_fetch`; setup guide: [Flare Developer Hub MCP Server](/network/guides/flare-developer-hub-mcp-server).
-   **Discovery:** [`/.well-known/mcp`](/.well-known/mcp)
-   **llms.txt:** [`/llms.txt`](/llms.txt) — when-to-use guidance and Markdown page index
-   **Agent instructions:** [`/AGENTS.md`](/AGENTS.md)
-   **Markdown pages:** append `.md` to any doc URL (for example `/ftso/overview.md`)

## Developer tools catalog[​](#developer-tools-catalog "Direct link to Developer tools catalog")

Browse curated RPCs, bridges, indexers, wallet SDKs, and more on [Developer Tools](/network/developer-tools).