# Agent Payments Atlas > Protocols, wallets and payment infrastructure for AI agents Read-only editorial reference. Examples and calculations are illustrative, not authorization to transact. Product affiliations and source limitations are disclosed in the guides. ## Agent access - [MCP endpoint](https://agentpaymentsatlas.com/mcp): public read-only Streamable HTTP; tools `search_guides` and `get_guide`. - [Search index](https://agentpaymentsatlas.com/search.json): titles, descriptions, canonical URLs and Markdown resources. - [Full text](https://agentpaymentsatlas.com/llms-full.txt): the same published guide content. - [Editorial method](https://agentpaymentsatlas.com/methodology/). ## Guides - [AI Agent Payment Infrastructure: Protocols, Wallets and APIs](https://agentpaymentsatlas.com/markdown/PA01.md): Explore payment protocols, wallets and paid APIs for AI agents. Compare authority boundaries and find a practical integration path. - [Agentic Payment Protocols: What Each Standard Does](https://agentpaymentsatlas.com/markdown/PA02.md): See how agent payment standards divide authorization, checkout and settlement. Find the right x402, AP2 or MPP guide for your task. - [AI Agent Wallets: Compare Custody, Controls and Payment Rails](https://agentpaymentsatlas.com/markdown/PA03.md): Compare AI agent wallets by custody, assets, payment routes and spending controls. Build a shortlist with documented limits and evidence. - [x402 Marketplaces and Paid APIs: Discovery to Delivery](https://agentpaymentsatlas.com/markdown/PA04.md): Learn how x402 marketplaces expose paid resources. Check discovery metadata, payment terms and delivery before choosing an API. - [Integrate AI Agent Payments: A Practical Implementation Path](https://agentpaymentsatlas.com/markdown/PA05.md): Plan an AI agent payment integration from authority and wallet selection to retries, delivery checks and a bounded production pilot. - [Agentic Payment Providers: Compare What They Actually Enable](https://agentpaymentsatlas.com/markdown/PA06.md): Compare agent payment providers by their actual role, supported protocols, availability and operational evidence before choosing a pilot. - [Agentic Payments Explained: How AI Agents Pay](https://agentpaymentsatlas.com/markdown/PA07.md): Understand how AI agents receive permission to pay, use cards or stablecoins, and verify that a paid resource was actually delivered. - [x402 Protocol Guide: Payment Challenges, Settlement and Delivery](https://agentpaymentsatlas.com/markdown/PA08.md): Follow an x402 payment from the HTTP 402 challenge to settlement and delivery. Review versioned examples, retries and failure handling. - [AP2 Agent Payments Protocol: Mandates and Integration](https://agentpaymentsatlas.com/markdown/PA09.md): Understand AP2 v0.2 checkout and payment mandates, trust boundaries and consent. Use a versioned checklist to plan an integration. - [Machine Payments Protocol: MPP Architecture and Integration](https://agentpaymentsatlas.com/markdown/PA10.md): Explore Machine Payments Protocol flows, payment methods and sessions. Check integration requirements and lifecycle failure cases. - [Visa Intelligent Commerce: Merchant and Agent Requirements](https://agentpaymentsatlas.com/markdown/PA11.md): Review Visa Intelligent Commerce roles, credentials and integration requirements. Check availability and partner dependencies before a pilot. - [Mastercard Agent Pay: How It Works and Who Can Use It](https://agentpaymentsatlas.com/markdown/PA12.md): Understand Mastercard Agent Pay roles, payment consent and integration dependencies. Check documented capabilities and market availability. - [Agent-to-Agent Payments: Authority, Settlement and Receipts](https://agentpaymentsatlas.com/markdown/PA13.md): Design agent-to-agent payments with bounded authority, retry handling and traceable settlement. Keep payment and service delivery separate. - [AI Agent Payment Authorization: Consent, Scope and Approval](https://agentpaymentsatlas.com/markdown/PA14.md): Define what an AI agent may spend, where and when. Compare consent, delegated policies, approval records and authority revocation. - [AI Agent Wallet Spending Limits: Budgets and Enforcement](https://agentpaymentsatlas.com/markdown/PA15.md): Set payment budgets for AI agent wallets. Account for pending attempts, reserves, fees and concurrent spend with an enforcement checklist. - [x402 Bazaar Guide: Discover and Validate Paid Resources](https://agentpaymentsatlas.com/markdown/PA16.md): Discover paid resources through x402 Bazaar and validate metadata, pricing and payment requirements before an agent calls an endpoint. - [MCP Payments: Paying for Tools and Exposing Payment Actions](https://agentpaymentsatlas.com/markdown/PA17.md): Distinguish MCP tools that make payments from paid MCP access. Compare trust, authorization, retry behavior and receipt requirements. - [Accept AI Agent Payments for Your API with x402](https://agentpaymentsatlas.com/markdown/PA18.md): Plan a paid API with x402: publish payment terms, verify an attempt and deliver the resource. Review retries, expiry and test cases. - [x402 vs AP2 vs MPP: Compare Roles, Flows and Requirements](https://agentpaymentsatlas.com/markdown/PA19.md): Compare x402, AP2 and MPP by the problems they solve, payment flows and integration requirements. Choose by use case and protocol version. - [Stablecoins vs Cards for AI Agent Payments](https://agentpaymentsatlas.com/markdown/PA20.md): Compare stablecoins and cards for AI agent purchases by acceptance, custody, fees, recovery and geography. Choose a rail for your task. - [Coinbase Agentic Wallet: Capabilities, Controls and Limits](https://agentpaymentsatlas.com/markdown/PA21.md): Review Coinbase Agentic Wallet capabilities, custody, payment routes and spending controls. Separate the wallet from AgentKit and Agentic Market. - [Circle Agent Wallets: Agent Stack Capabilities and Limits](https://agentpaymentsatlas.com/markdown/PA22.md): Identify the Circle wallet products relevant to AI agents. Review custody, integration responsibilities and documented capabilities. - [Crossmint Agent Payments: Wallets, Standards and Merchant Reach](https://agentpaymentsatlas.com/markdown/PA23.md): Map Crossmint agent wallets and payment standards. Check merchant reach, authorization, integration evidence and current limitations. - [Stripe AI Agent Payments: Wallets, Protocols and Tooling](https://agentpaymentsatlas.com/markdown/PA24.md): Find the Stripe product or protocol for your agent payment task. Separate ACP, MPP, buyer tooling and merchant checkout requirements. - [AI Agent Payment Stack Selector](https://agentpaymentsatlas.com/markdown/PA25.md): Choose payment infrastructure for an AI agent by task, rail, custody and approval constraints. Export a shortlist and verification questions. - [About Payments Atlas](https://agentpaymentsatlas.com/markdown/PA26.md): Learn who publishes Payments Atlas, our focus on payment infrastructure, wallets and paid APIs, and how we disclose product relationships and handle corrections. - [How Payments Atlas Evaluates Products and Evidence](https://agentpaymentsatlas.com/markdown/PA27.md): See how Payments Atlas checks payment infrastructure, wallets and paid APIs, records evidence and limitations, and separates documented claims from hands-on results.