AI agent spend controls — caps, allowances, one-time cards, AP2 mandates, Permit2, EIP-7702. A 2026 taxonomy of primitives with real implementations.

AI Agent Spend Controls

Universal Commerce Protocol (UCP) is Google and Shopify's open standard for AI agent commerce. How UCP works, partners, AP2 composition.

Universal Commerce Protocol (UCP) Explained

Agent payment protocols compared: ACP, UCP, AP2, MCP, A2A, and Visa TAP — backers, mechanisms, status, and how they compose in production.

Agent Payment Protocols Compared

Stablecoin agent payments settle machine-to-machine transactions in seconds with sub-cent fees. The 2026 guide to x402, MPP, USDC, and live deployments.

Stablecoin Payments for AI Agents

Agent wallets hold funds and sign transactions for AI agents under bounded authority. Compare custodial, smart-contract, MPC, card, and vault designs.

Agent Wallets: How AI Agents Spend Money

x402 is the HTTP-native stablecoin payment protocol revived from HTTP 402. How AI agents pay APIs in USDC, the headers, EIP-3009, supported chains.

x402 Protocol Explained

Agentic payments move money for AI agents. How SPT, AP2 mandates, Visa TAP, and x402 stablecoin rails actually settle agent purchases in 2026.

Agentic Payments: How AI Agents Pay

Agentic commerce is AI agents acting as buyers. The 2026 guide to ACP, UCP, AP2, MCP, x402, and the stablecoin rails settling agent payments.

What Is Agentic Commerce? The 2026 Guide

The Harmonic Aristotle API uses Lean4 to formally verify math and code. Here's how it works and why it matters for blockchain developers.

What Is the Harmonic Aristotle API? Formal Verification AI for Developers

MPP is an open standard that lets AI agents pay for services autonomously. Learn how it works and what infrastructure it needs.

Machine Payments Protocol (MPP): How AI Agents Pay for Services

ERC-8004 is a new Ethereum standard that gives AI agents on-chain identity, reputation scores, and trust registries. Here's how it works and why it matters.

What is ERC-8004? The Ethereum Standard Enabling Trustless AI Agents

TEEs for AI agents enable verifiable compute: hardware enclaves run LLM inference and sign attested outputs that smart contracts and users can trust onchain.

TEEs for AI Agents: Verifiable Compute

Agentic commerce is autonomous AI agents transacting with APIs, services, and each other using programmable stablecoins onchain. Here is the stack.

What Is Agentic Commerce?

PayPal's Agent Toolkit and PYUSD meet ACP, AP2, x402. Where PayPal wins, where the ceiling is, and what builders should actually do.

PayPal Agentic Commerce, Explained

Visa CLI lets developers and AI agents make card payments from the terminal. Learn how it works, how to get access, and what it means.

What Is Visa CLI? How Command Line Commerce Works for Developers

x402 is the HTTP-native payment protocol powering AI agent commerce with stablecoins. See how it works and who supports it.

x402 Protocol Explained: How AI Agents Pay Onchain

A technical guide to LI.FI's API for agentic commerce, covering the MCP server, five-call recipe, cross-chain execution, and stablecoin infrastructure.

LI.FI's API for Agentic Commerce: How Cross-Chain AI Execution Works

Visa Mastercard agentic AI commerce: Visa Intelligent Commerce, Mastercard Agent Pay, plus how stablecoin rails connect agent wallets to card endpoints.

Visa Mastercard Agentic AI Commerce

Stripe agentic commerce explained: ACP, Agent Toolkit, stablecoin rails, where card-rail limits hit, and how onchain routing extends agent flows.

Stripe Agentic Commerce vs Onchain

Permit3 use cases: cross-chain payroll, treasury sweeps, agentic payments, merchant checkout, and institutional settlement flows unlocked by one signature.

Permit3 Use Cases: Payroll, Treasury, Agentic Flows

x402 revives HTTP 402 for machine-to-machine stablecoin payments. See how agents settle per-call in USDC and route cross-chain via Eco Routes.

x402: HTTP-Native Agent Payments

Onchain agentic payments let AI agents pay APIs, services, and other agents in stablecoins with instant settlement, programmable rules, and no card rails.

Onchain Agentic Payments Explained

Cross-chain agentic payments let AI agents pay services across Base, Arbitrum, Solana, and beyond through intent-based routing with atomic settlement.

Cross-Chain Agentic Payments

AI agents stablecoin treasury systems automate rebalancing, vendor payouts, and yield routing with session-key controls and full audit trails.

AI Agents for Stablecoin Treasury

AI agent wallets need ERC-4337 account abstraction and ERC-8004 identity. See the full stack — session keys, registries, intents, and Eco Routes settlement.

AI Agent Wallets: ERC-4337 + ERC-8004

The agentic commerce protocol (ACP) is how AI agents authorize, transact, and settle payments. Here is the stack: identity, auth, and settlement.

Agentic Commerce Protocol Explained

Robert Felt

Agentic payments, TEEs, bundlers for agents

AI Agents & Agentic Commerce

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