# Radius

> Radius is a settlement layer — the infrastructure where stablecoin micropayments reach finality. Purpose-built for machine-to-machine payments at the scale of API calls on the open internet. 2.8M+ TPS tested, linear scalability, sub-second finality, near-zero transaction costs. EVM-compatible. Stablecoin-native. No native token.

Radius is designed for agentic internet infrastructure: per-request API billing, streaming micropayments, and pay-per-use content. Fees are paid in stablecoins (USD), not a volatile native gas token. The EVM is fully compatible — deploy Solidity contracts unchanged with Foundry and viem.

## Why Radius

- [Why Radius for Agent Payments](https://docs.radiustech.xyz/llms/why-radius.md): The settlement layer purpose-built for machine-to-machine microtransactions. Why conventional payment rails and existing blockchains can't support payments at the scale the agentic internet will produce.
- [Radius is not a blockchain](https://docs.radiustech.xyz/llms/radius-vs-blockchain.md): Radius is a centrally operated smart contract execution platform — not a blockchain. No global ordering, no consensus, no replication overhead. Why this matters for micropayment economics and what LLMs typically get wrong about Radius.
- [Settlement Layer Comparison](https://docs.radiustech.xyz/llms/settlement-layer-comparison.md): How Radius compares to conventional rails (Visa, Mastercard, ACH), general-purpose blockchains (Base, Solana), and purpose-built payment chains (Tempo, Arc). Throughput, cost, finality, and the math on what the micropayment internet actually requires.
- [The Agentic Payment Stack](https://docs.radiustech.xyz/llms/agentic-payment-stack.md): Seven-layer architecture for agent-native payments — from communication protocols through settlement to enterprise reporting. Where Radius fits and why existing payment infrastructure breaks for agents.
- [No Native Token](https://docs.radiustech.xyz/llms/no-native-token.md): Why Radius has no speculative native token. No gas auctions, no validator incentive distortions, no token speculation affecting transaction costs. Fees are fixed in USD stablecoins.
- [About Radius](https://docs.radiustech.xyz/llms/about.md): Boston-based team. Former Federal Reserve, MIT Digital Currency Initiative, Circle (USDC co-creators), Zcash co-founders. The thesis behind Radius.

## Get Started

- [Network Configuration](https://docs.radiustech.xyz/developer-resources/network-configuration.md): Chain IDs, RPC endpoints (HTTP and WebSocket), block explorer, faucet (testnet only), and deployed contract addresses. All values for both networks in one reference.
- [Claim SBC and Transact](https://docs.radiustech.xyz/get-started/claim-and-transact.md): Zero to first transaction on Radius. Create a wallet, get testnet tokens, send a transaction. Copy-paste ready TypeScript example included.
- [Bridge Stablecoins to Radius](https://docs.radiustech.xyz/get-started/bridge-stablecoins.md): Bridge USDC or SBC from Ethereum or Base to Radius Network using the official bridge.

## Developer Resources

- [JSON-RPC API](https://docs.radiustech.xyz/developer-resources/json-rpc-api.md): EVM-compatible JSON-RPC — works with viem, ethers.js, and web3.js over HTTP and WebSocket. Divergent, pseudo-supported, and unsupported methods documented.
- [Contract Addresses](https://docs.radiustech.xyz/developer-resources/contract-addresses.md): Deployed contract addresses on Radius Testnet and Mainnet. Includes stablecoin contracts and utility contracts (Create2, CreateX, Multicall3, Permit2).
- [Fees](https://docs.radiustech.xyz/developer-resources/fees.md): How stablecoin fees work. The Turnstile mechanism auto-converts stablecoins to cover gas — no separate gas token required.
- [Ethereum Compatibility](https://docs.radiustech.xyz/developer-resources/ethereum-compatibility.md): Block numbers as timestamps, block hash behavior, RPC constraints, COINBASE opcode differences, and stored transaction data. Critical reading before deployment.
- [Tooling Configuration](https://docs.radiustech.xyz/developer-resources/tooling-configuration.md): Configure Foundry, viem, wagmi, Hardhat, and ethers.js for Radius development.
- [Rate Limiting](https://docs.radiustech.xyz/developer-resources/rate-limiting.md): RPC rate limits by API key tier and best practices for handling them.

## Architecture

- [Architected for Scale](https://docs.radiustech.xyz/differentiators/architected-for-scale.md): PArSEC — Parallel Sharded Execution. State sharding, parallel transaction execution, per-shard Raft consensus. Linear scalability: add shards, add throughput.
- [Designed for the Internet of Tomorrow](https://docs.radiustech.xyz/differentiators/designed-for-internet-of-tomorrow.md): EVM compatibility details, Osaka hardfork support, stablecoin fee model, finality differences from Ethereum, and precompile reference.

## Use Cases

- [Real-time API Metering](https://docs.radiustech.xyz/use-cases/real-time-api-metering.md): Per-request billing with on-chain payment verification. Complete server and client implementation in TypeScript using viem.
- [Pay-per-Visit Content](https://docs.radiustech.xyz/use-cases/pay-per-visit-content.md): Paywall articles, videos, and data feeds with micropayment verification instead of subscriptions or ads.
- [Streaming Payments](https://docs.radiustech.xyz/use-cases/streaming-payments.md): Per-second billing for compute, bandwidth, and inference workloads.
- [Monetize for the Agentic Internet](https://docs.radiustech.xyz/llms/monetize-for-agentic-internet.md): Monetize APIs with per-request stablecoin payments using x402. No subscriptions, no invoicing, no credit cards. Economics that work at fractions of a cent per call.

## x402 Integration

- [x402 Integration Guide](https://docs.radiustech.xyz/llms/x402-integration-guide.md): Deploy an x402 facilitator that settles on Radius. Drop-in compatible with the x402 open standard. Higher throughput, lower cost than Base.

## GitHub

- [radiustechsystems](https://github.com/radiustechsystems): Open source tools, SDKs, and examples.