Comparisons and explainers
AI Agent Payments Comparisons and Protocol Explainers
How the agent payment rails, protocols, and platforms actually compare, each page led by its own primary keyword and original research where we have it.
Plaid MCP Server
Plaid ships two MCP servers with 9 tools and none move money. We measured the Transfer API behind them: its limits are one company-wide ceiling.
ReadAirwallex MCP Server
Airwallex MCP holds 12 write scopes and no money-out scope. We probed it: an agent can issue cards and pick their limits, and the sandbox server gets 20.
ReadTipalti MCP Server
Tipalti MCP is read-only, yet its OAuth server lists 12 write scopes. We read all 36 Tipalti API operations: 5,000-payment batches and no amount cap.
ReadMercury MCP Server
Mercury MCP can only request payments, never send them. We read all 74 Mercury API operations: direct sends skip approval rules and card locks are app-only.
ReadBill.com MCP Server
The Bill.com MCP server is read-only. We read all 325 BILL API operations: payments need MFA, but none of the 11 that set limits or approvals do.
ReadDeel MCP Server
The Deel MCP server has 116 tools and 100 OAuth scopes, 47 of them write. None carries an amount, and two payment calls can auto approve themselves.
ReadRippling MCP Server
The Rippling MCP server shows one code tool over 31 functions, 12 of them write. None moves money and pay data is excluded. See what that means.
ReadZapier MCP and Zapier Agents
Zapier MCP gives AI agents 66 money actions across 9 finance apps and zero spending caps. See what Zapier controls, what it bills, and where a limit goes.
ReadSierra AI agents
Sierra AI agents issue refunds and credits under rules written in prose. Sierra's own benchmark says the API does not check them. Add a hard dollar cap.
ReadWorkato MCP and Genies
Workato MCP servers for finance apps expose 33 write tools and only one checks a budget. See what Workato Genies govern and where a dollar limit has to go.
ReadIBM watsonx Orchestrate
watsonx Orchestrate costs 530 or 6,360 USD a month. We scanned IBM's ADK: 1,149 agent and flow properties, zero money fields. See what that leaves open.
ReadAmex Agentic Commerce
American Express agentic commerce puts a spend amount inside each agent intent and backs agent mistakes. We probed every Amex host for the ACE spec and MCP server.
ReadConcur AI and Joule
Concur AI and Joule agents now build and pre-audit expense reports. We read all 108 Concur API scopes. None carries a dollar limit, and approve takes no amount.
ReadCoupa AI and Navi
Coupa AI agents now approve, pay and write through Coupa MCP. We probed six live US tenants: the MCP token carries two scopes, read and write, and no dollar limit.
ReadNavan and Expensify
Navan AI and Expensify agents can now approve expense reports. We read both MCP servers and the Expensify agent API, and the dollar limit is a sentence.
ReadHubSpot Breeze
HubSpot Breeze agents can write quotes, orders and carts. We measured 157 HubSpot OAuth scopes: 29 cover commerce, none set a dollar limit. See where it goes.
ReadIntercom Fin
Intercom Fin can refund Stripe payments through Procedures. We measured the Intercom MCP server: 14 tools, 3 writes, none touch money. See where the cap goes.
ReadZendesk AI Agents
Zendesk AI agents can refund Shopify orders and call any API. We measured the Zendesk MCP server: two scopes, read and write. See where the refund limit goes.
ReadBrex AI Agents
Brex AI and the Brex MCP server, measured: 43 tools, 5 writes, no limit or transfer tools. The Brex API can create limits and send money. See where agents fit.
ReadRamp AI Agents
Ramp AI agents and the Ramp MCP server, measured: 52 OAuth scopes, 21 writes, and a funds:write scope that can raise a limit or unsuspend a fund. See the fix.
ReadSAP Joule
SAP Joule spend controls, measured in SAP's own Joule Studio packages: the only number on a Joule agent is an iteration count. See what that leaves open.
ReadUiPath Agentic Automation
UiPath agentic automation spend controls, measured in UiPath's own SDKs: the policy check named budget counts tool calls, not dollars. See what it leaves open.
ReadWorkday AI Agents
Workday AI agents, measured in Workday's own ASOR API: 101 agent properties, zero money fields. What Illuminate agents control, cost, and leave open.
ReadOracle AI Agent Studio
Oracle AI Agent Studio, measured in Oracle's own API spec: 215 agent properties, no spend limit. What Oracle AI agents control, cost, and leave open.
ReadServiceNow AI Control Tower
ServiceNow AI Control Tower, measured in its own SDK: 84 AI agent columns, zero money fields. What it governs, what it costs, and where agent spend stays open.
ReadGemini Enterprise
Gemini Enterprise spend controls, measured in Google’s own API: the cap is a Cloud Billing budget with nine filters, and not one of them can see an agent.
ReadSalesforce Agentforce
Agentforce spend controls, measured: Salesforce documents 178 money objects and 41 agent objects, and not one object carries both vocabularies.
ReadAWS AgentCore
AWS AgentCore spend controls, measured from the API: Bedrock AgentCore enforces one per-session USD amount and no merchant, category or approval rule.
ReadMicrosoft Agent 365
Agent 365 pricing is 15 dollars per user per month, or 99 in Microsoft 365 E7. What Agent 365 and Entra Agent ID govern, and the one control they omit.
ReadQuickBooks MCP Server
QuickBooks MCP server, NetSuite MCP and Xero MCP server compared: tool counts, write scopes, delete access and what our September 2026 probe found.
ReadPayment MCP Servers
Stripe MCP server, Shopify MCP server and PayPal MCP server compared: live endpoints, OAuth scopes, write surface and what our September 2026 probe found.
ReadPayPal Agentic Commerce
PayPal agentic commerce explained: what Agent Ready and Store Sync do, where the PayPal MCP server fits, and what our September 2026 endpoint probe found.
ReadShopify Agentic Commerce
Shopify agentic commerce explained: how Agentic Storefronts put your store inside ChatGPT and Copilot, what fees apply, and the UCP file we probed on 14 stores.
ReadWeb Bot Auth
Web Bot Auth explained: how RFC 9421 HTTP message signatures verify AI agent traffic, which agents actually publish keys today, and what it will never control.
ReadTempo Blockchain
Tempo blockchain explained: the Stripe and Paradigm stablecoin L1, TIP-20, the Machine Payments Protocol, and what it does not control about agent spend.
ReadAI Agent Governance
AI agent governance in 2026: what NIST and OWASP actually cover, which AI agent guardrails bind at runtime, and where every framework stops short of the money.
ReadA2A Protocol
The A2A protocol reached v1.0 in April 2026 with 150+ organizations. What it standardizes, how it differs from MCP, and why paying an agent needs an extension.
ReadMastercard Agent Pay
Mastercard Agent Pay in 2026: what Agentic Tokens control, what Verifiable Intent proves, what Agent Pay for Machines added, and the gap all three leave.
ReadVisa Intelligent Commerce
Visa Intelligent Commerce in 2026: what the Trusted Agent Protocol proves, what Intelligent Commerce Connect and the VIC APIs cover, and the gap they leave.
ReadStripe agentic commerce
What Stripe agentic commerce actually ships in 2026: the Agentic Commerce Suite, shared payment tokens, MPP versus x402, the Agent Toolkit, and the gap left.
ReadChatGPT Instant Checkout
ChatGPT Instant Checkout launched in September 2025 and was phased out in March 2026. What OpenAI replaced it with, why it stalled, and what merchants do now.
ReadGoogle AP2
Google AP2 explained: how the Agent Payments Protocol signs Checkout and Payment Mandates, the v0.2 FIDO handover, and where the AP2 protocol stops.
ReadHuman in the loop AI
Human in the loop AI explained: what HITL means, human in the loop vs human on the loop, the four approval patterns, and where the gate actually holds.
ReadAI agent cost
AI agent cost explained: the pricing models vendors bill on, what an AI agent costs per month, and the third budget line no vendor puts on an invoice.
ReadAgentic checkout
Agentic checkout explained: how an AI agent completes a purchase, how the ACP and UCP protocols differ, and what merchants change to accept agent orders.
ReadAPI monetization
API monetization explained: the eight pricing models, how to choose a strategy, which platforms meter and bill API calls, and how to charge AI agents per call.
Readx402 protocol
x402 protocol explained: how HTTP 402 Payment Required lets AI agents pay per API call, what a facilitator does, what changed in v2, and how to cap spend.
ReadAI procurement agents
AI procurement software compared: what agentic procurement platforms and AI procurement agents actually do, where each stops, and how to cap agent spend.
ReadAgentic payments
Agentic payments explained: how agentic AI payments work, the four rails agents pay over, what the forecasts really say, and how to control agent spend.
ReadAI agent monetization
AI agent monetization explained: the pricing models that work in 2026, what Agentforce and Fin actually charge per action, and the rails that collect.
ReadAgent payment platforms
AI agent payment platforms compared: card issuers, agent wallets, checkout protocols, and control planes, and which one actually enforces a spend limit.
ReadUniversal Commerce Protocol
Universal Commerce Protocol (UCP) explained: the Google and Shopify open standard for AI agent checkout, how it works, and how UCP compares to ACP.
ReadMCP Payments
MCP payments explained: how AI agents pay through a payments MCP server, which protocol settles underneath, and how to cap agent spend.
ReadVisa Intelligent Commerce vs Mastercard Agent Pay
Visa Intelligent Commerce vs Mastercard Agent Pay compared: how each card network lets AI agents pay, and how to govern the spend.
ReadAgentic Commerce Protocol
Agentic Commerce Protocol: what OpenAI and Stripe maintain in ACP, the 2026-04-17 spec, how Stripe ACP support works, and what it leaves to you.
ReadAP2 vs ACP vs x402
Agent payments protocol explained: how Google AP2, the Agentic Commerce Protocol, and x402 differ, and how a rail-neutral control plane works. Get started.
ReadMachine payments protocol
Machine Payments Protocol (MPP): the HTTP 402 standard Stripe and Tempo co-authored, how it differs from x402, and the spend control it leaves to you.
ReadKnow Your Agent (KYA)
Know Your Agent (KYA) explained: how agent identity, ownership, and accountability work for AI payments, and why it matters. Get started.
ReadSee how AgentsPay compares
Wallets, controls, approvals, cards, and audit. Start in the sandbox today.