Radius llm.txt

llm.md

Radius

Radius is stablecoin-native settlement infrastructure for the agentic internet. It settles machine-to-machine micropayments at the scale of API calls, paid content, and streaming compute. 2.8M+ TPS tested, linear scalability, sub-second finality, near-zero transaction costs, EVM-compatible execution, stablecoin fees, and no native token.

Radius is built for agentic commerce: per-request API billing, HTTP-native x402 payments, pay-per-visit content, and streaming payments. Developers can use standard Ethereum tooling - Solidity, Foundry, viem, wagmi, ethers.js, and JSON-RPC - while paying fees in stablecoins instead of volatile gas tokens.

What changed since launch

• Radius now has first-party x402 facilitator infrastructure for HTTP 402 payments on Radius mainnet and testnet.
• Radius x402 supports Permit2 settlement, EIP-2612 gas sponsoring, /supported, /verify, /settle, and /health facilitator endpoints.
• Radius publishes agent skills through /.well-known/agent-skills/, including radius-dev, x402, and dripping-faucet.
• Radius Workshop now publishes public prototypes for the agentic economy: Hermes and OpenClaw deployment templates, NEST payment agents, x402 merchant demos, Radius wallet libraries, and Solidity primitives for agent commerce.
• Radius docs now include production-oriented tooling guides for Foundry, viem, wagmi, Hardhat, ethers.js, JSON-RPC behavior, contract addresses, fees, and Ethereum compatibility.
• Radius release notes track protocol and RPC improvements including nonce-gap handling, eth_sendRawTransactionSync, eth_maxPriorityFeePerGas, receipt fixes, and mainnet Chain ID 723487.

Why Radius

• Why Radius for Agent Payments: Why conventional rails and general-purpose blockchains do not fit high-volume agent micropayments.
• Radius is not a blockchain: Radius is a centrally operated smart contract execution platform, not a globally replicated blockchain. This is key to its micropayment economics.
• Settlement Layer Comparison: Radius compared with Visa, Mastercard, ACH, Base, Solana, Tempo, and Arc.
• The Agentic Payment Stack: Seven-layer model for agent-native payments and where Radius fits.
• No Native Token: Fees are fixed in USD stablecoins, with no speculative gas token.
• About Radius: Team, thesis, and background.

x402 and Agent Payments

• x402 Integration: Accept HTTP-native payments on Radius with hosted or self-managed facilitators.
• x402 Facilitator API: /supported, /verify, /settle, /health, headers, status codes, and payment outcome mapping.
• Monetize for the Agentic Internet: Charge per API call in stablecoins using x402.
• Real-time API Metering: Per-request API billing with on-chain verification.
• Pay-per-Visit Content: Micropayment paywalls for articles, videos, feeds, and downloads.
• Streaming Payments: Per-second billing for compute, bandwidth, and inference.

Agent Skills

• Agent Skills Discovery: Machine-readable Radius skill index.
• Radius Development Skill: End-to-end playbook for building Radius apps with viem, wagmi, Foundry, x402, Turnstile fees, and production gotchas.
• x402 Skill: Server-side and client-side x402 integration on Radius.
• Dripping Faucet Skill: Programmatic testnet and mainnet faucet flows for agents.

Radius Workshop

Radius Workshop is the public experimental lab for Radius product prototypes, agentic payment apps, and harness extensions. It shows Radius beyond core settlement: deployable agents, wallet tooling, x402 demos, agent-to-agent commerce contracts, and application patterns for the agentic economy.

• Radius Workshop: Public GitHub organization where the Radius product team explores new concepts, frameworks, and technologies.
• Merchant Console Demo: Radius x402 paid-API demo showing HTTP 402 payment-required responses, facilitator verify/settle flow, sub-second settlement metrics, recent paid events, and agent traffic visualization.
• Radius Hermes Railway Template: Deploy a Radius-ready Hermes agent on Railway with persistent state, Radius wallet funding, agent discovery, A2A communication, ERC-8004 registration tools, and Radius skills.
• Radius OpenClaw Railway Template: Deploy an OpenClaw gateway on Railway with persistent state, Radius skills, and Radius wallet tools.
• Radius Agent Template: Minimal NEST payment agent that can send and receive Radius payments, register with the NANDA agent network, and expose A2A messaging.
• Radius Agent Contracts: Solidity contracts for agent-to-agent commerce, including escrow, bounties, pay-per-query billing, and revenue splitting.
• Radius Wallet Python: Simple Python wallet library for Radius.
• Radius Wallet TypeScript: Simple TypeScript wallet library for Radius.
• Radius Cloudflare Agents: Radius-oriented work around persistent Cloudflare agent runtimes.
• Radius Policy: Generic allowlist/blacklist policy engine for on-chain compliance.
• Radius Token: Policy-enforced ERC-20 with mint/burn, pause, and supply cap.
• Radius Keychain: Delegated sub-keys with spending limits and call scopes.
• Radius Stream Channel: EIP-712 payment channels with cumulative vouchers.
• Radius DEX: Order book DEX prototype with multi-hop routing through a hub token.
• Radius Virtual Address: Deterministic virtual addresses for merchant deposit routing.

Developer Resources

• Network Configuration: Chain IDs, RPC URLs, WebSocket endpoints, explorers, faucet URLs, and network metadata.
• Contract Addresses: Stablecoins, Create2, CreateX, Multicall3, Permit2, and x402 contracts.
• JSON-RPC API: EVM-compatible RPC methods, Radius-specific behavior, and unsupported methods.
• Ethereum Compatibility: Block numbers as timestamps, block hash behavior, log filters, balance behavior, and EVM differences.
• Tooling Configuration: Configure Foundry, viem, wagmi, Hardhat, and ethers.js.
• Fees: Stablecoin-native fees and Turnstile conversion.
• Release Notes: Recent product, RPC, and network changes.

Architecture

• Architected for Scale: PArSEC, state sharding, parallel transaction execution, per-shard Raft, and linear scalability.
• Designed for the Internet of Tomorrow: EVM compatibility, Osaka support, stablecoin fees, finality, and precompiles.

GitHub

• radiustechsystems: Core Radius open source tools, SDKs, facilitator code, skills, and examples.
• radius-workshop: Public product lab for Radius prototypes, agentic payment apps, deployment templates, and agent-commerce experiments.