Production network: Arc Mainnet. FlareHQ production at flarehq.xyz settles on Arc Mainnet (chain ID
5042, RPC https://rpc.mainnet.arc.io, explorer https://explorer.arc.io). Arc Testnet (chain ID 5042002) remains available only as a development/test environment — see the testnet notes on individual pages.Quickstart
Get your first USDC payment running in under 5 minutes with the FlareHQ SDK.
Authentication
Generate API keys and learn how to authenticate every request.
Hosted Checkout
Accept stablecoin payments with a pre-built, embeddable checkout UI.
x402 Protocol
Monetize REST endpoints per-request using HTTP 402 micro-payments.
Streaming Payments
Stream USDC continuously per-second to any wallet address.
Escrow & Disputes
Lock funds on-chain with milestone-based release and dispute handling.
AI Agent Finance
Deploy ERC-8004 autonomous agents with Circle MPC wallets.
API Reference
Explore every endpoint with request and response schemas.
How FlareHQ works
FlareHQ connects your application to Arc Mainnet through a simple REST API and JavaScript SDK. Payments settle in USDC using Circle Developer-Controlled (SCA) wallets — operations are server-authorized and no private keys are exposed to you.1
Create an account
Sign up at flarehq.xyz and verify your email to activate your merchant account.
2
Get your API key
Verify your merchant email (
POST /api/merchant/verify) to receive your API key (arc_live_..., shown once).3
Install the SDK
Add
@flarehq/sdk to your project and initialize the client with your API key.4
Start accepting payments
Create a checkout session, set up an x402 paywall, or deploy a payment stream — all through the same unified SDK.
Core capabilities
Payment Links
Shareable, reusable USDC checkout URLs — no code required.
x402 Marketplace
List and monetize API endpoints discoverable by AI agents and developers.
CCTP Bridge
Move USDC across chains via Circle CCTP (Arc Mainnet development flow — see page for production status).
ERC-8183 Jobs
Post on-chain job contracts and pay autonomous agents for completed work.
Webhooks
Receive real-time event notifications for every payment lifecycle event.
SDKs
Official libraries for Node.js, React, and Python.
Merchant Platform
Sign up, verify, and manage your business — payouts, wallet setup, and payment links.
Consumer Payments
Sessions, balances, and send/request flows for end users of your product.
Payroll
Pay an entire team, contractor pool, or agent cohort in a single batch call.