Pay-per-use tools, monetization, and spend controls for AI agents
xpay✦ gives AI agents access to 1,000+ API tools from 80+ providers with pay-per-call pricing. Developers can monetize any API or MCP server in minutes. And Smart Proxy adds spending limits so autonomous agents never overspend.
1,000+ tools
Pay per call
$5 free credits
Sub-200ms latency
What We Are & What We're Not
Agents need tools, tools cost money, xpay✦ makes that simple.
What xpay Is
Tool Discovery Platform
1,000+ API tools from 80+ providers — search, enrichment, scraping, AI models, finance, and more. One MCP connection, pay-per-call pricing, no subscriptions.
Monetization Platform
Any developer can monetize their API or MCP server. Set your price per call, get a proxy endpoint, and start earning from AI agent traffic immediately.
Spend Control Engine
Smart Proxy wraps agent API calls with per-agent budgets, rate limits, and allowed destinations. Financial guardrails so agents never overspend.
What xpay Is NOT
Not a Custodial Wallet
We never hold your funds. Payments settle peer-to-peer between agents and service providers.
Not a Walled Garden
Bring your own tools, APIs, and MCP servers. xpay✦ adds payments and controls on top — it doesn't lock you in.
Core Products
Everything you need to discover tools, control agent spending, and monetize your APIs.
Tool Discovery
1,000+ API Tools, One Connection
Browse and call 1,000+ API tools from 80+ providers — search, enrichment, scraping, AI models, finance, and more. Pay per call with no subscriptions. Connect once via MCP or REST and access everything.
1,000+ tools from 80+ providers
Pay-per-call pricing
Price discovery across providers
Single MCP connection
REST API fallback
$5 free credits to start
Smart Proxy
Financial Guardrails for Autonomous Agents
Wrap your agent API calls with spending limits and automatic payment handling. Set per-agent budgets, rate limits, and allowed destinations. Policy enforcement at the edge with sub-200ms latency.
Per-agent spending limits
Real-time budget tracking
Automatic payment handling
Rate limiting & throttling
Allowed destination lists
Instant alerts on anomalies
Paywall-as-a-Service
Turn Any API Into a Paid Endpoint
Wrap any API endpoint with pay-per-call pricing. Set your price per request, configure rate limits, and start accepting payments from AI agents. No smart contract deployment required.
One-line API integration
Dynamic pricing models
Instant settlement
Real-time analytics
Webhook notifications
Usage-based billing
MCP Server Monetization
Earn From Every Tool Call
Register your MCP server, set per-tool pricing, and get a proxy endpoint. AI agents discover and pay for your tools through the hub. Start earning from agent traffic immediately.
Register any MCP server
Per-tool pricing controls
Proxy endpoint provided
Listed on xpay.tools
Usage analytics dashboard
Automatic payouts
Under the Hood
You don't need to know the plumbing to use xpay✦ — but here's what powers it.
Built on the x402 Protocol
xpay✦ uses the x402 protocol (HTTP 402 "Payment Required") to handle payments between AI agents and API providers. When an agent calls a paid tool, payment is negotiated and settled automatically — no wallets to manage, no crypto to understand. Payments settle peer-to-peer in USDC on Base, meaning xpay✦ never holds your funds.
Protocol-Agnostic Design
As new agent payment protocols emerge (ACP, AP2, UCP), xpay✦ will add support without requiring changes to your integration. You configure spending policies once and xpay✦ handles the rest.
Who xpay Is For
Whether you're building agents, monetizing APIs, or running tools at scale — xpay✦ fits your workflow.
AI Agent Builders
Building agents with LangChain, CrewAI, Claude MCP, or custom frameworks? Give them access to 1,000+ tools with pay-per-call pricing and spending controls built in.
API Providers
Have an API that AI agents want to consume? Monetize it with pay-per-call pricing. Set your price, we handle billing and distribution to agent traffic.
MCP Server Developers
Built an MCP server? Register it on xpay, set per-tool pricing, and get a proxy endpoint. AI agents discover and pay for your tools through the hub.
Enterprises Running Agents
Deploying AI agents at scale? Control spending with per-agent budgets, audit trails, and real-time alerts. Never worry about runaway costs.
Workflow Automation Platforms
Building on n8n, Activepieces, or Zapier? Add paid tool access to your automation workflows with a single MCP connection.
Researchers & Experimenters
Exploring AI agent capabilities? Sign up, get $5 in free credits, and start calling tools immediately. No credit card required.
How It Works
From sign-up to your first tool call in under 5 minutes.
01
Sign Up & Get $5 Free Credits
Create an account at xpay.tools. No credit card required. You get $5 in free credits to start exploring tools immediately.
02
Browse & Search Tools
Explore 1,000+ API tools from 80+ providers. Compare pricing, read docs, and find the right tools for your agents.
03
Get Your API Key
Generate an API key. Use it with our MCP connection or REST API to start calling tools from your agents.
04
Set Spending Controls
Configure per-agent budgets, rate limits, and allowed tools. Smart Proxy ensures agents never exceed their limits.
05
Agents Call Tools & Pay Per Use
Your agents call tools through xpay. Payment is handled automatically per call. No wallets to manage, no crypto to understand.
06
Monitor & Optimize
Track spending in real-time. See which tools your agents use most. Optimize budgets based on actual usage patterns.
// Connect via MCP — access 1,000+ tools instantly { "mcpServers": { "xpay": { "url": "https://mcp.xpay.sh/mcp?key=YOUR_API_KEY" } } } // Or call tools via REST curl https://mcp.xpay.sh/exa-search \ -H "Authorization: Bearer YOUR_API_KEY" \ -d '{"query": "AI agent frameworks"}'
Use Cases
xpay enables autonomous transactions across the entire agentic economy. Here are some of the ways teams are using xpay today.
Autonomous Research Agents
Research agents that autonomously purchase API calls to search engines, databases, and knowledge bases without human approval for each query.
Agent OperationsCode Generation Pipelines
Multi-agent systems where code agents pay for compute, testing APIs, and deployment services as part of automated CI/CD.
Agent OperationsContent Creation Workflows
Content agents that pay for image generation, fact-checking services, and publishing APIs autonomously.
Agent OperationsAPI Monetization
Turn your existing APIs into revenue streams. Add x402 payment requirements with one line of code.
API ProvidersData Marketplace Access
Agents that purchase data feeds, market data, and proprietary datasets programmatically.
Data & AnalyticsML Inference Services
Pay-per-inference for ML models. Agents call specialized models and pay per prediction.
AI/MLCompute Resource Provisioning
Agents that spin up and pay for cloud compute, GPUs, and storage as needed for their tasks.
InfrastructureTranslation & Localization
Translation agents that pay for specialized translation APIs and human review services.
ContentWeb Scraping & Crawling
Agents that pay for anti-bot bypass services, proxy networks, and structured data extraction.
Data CollectionSecurity & Compliance Scanning
Security agents that purchase vulnerability scans, compliance checks, and threat intelligence feeds.
SecurityGlossary
Key terms and concepts used across the xpay✦ platform.
Tool Discovery
Finding and comparing API tools across providers. xpay's hub lets agents browse 1,000+ tools, compare pricing, and call them with a single connection.
Price Discovery
Comparing per-call pricing across multiple providers offering similar tools. xpay surfaces cost-per-call for every tool so agents (and developers) can optimize spend.
MCP (Model Context Protocol)
Anthropic's protocol for connecting AI models to external tools and data sources. xpay provides a single MCP endpoint that gives agents access to 1,000+ tools.
MCP Server Monetization
Registering your MCP server on xpay, setting per-tool pricing, and getting a proxy endpoint. AI agents discover and pay for your tools through the hub.
Smart Proxy
xpay's gateway that wraps agent API calls with spending controls and automatic payment handling. Enforces per-agent budgets, rate limits, and destination allowlists.
Paywall-as-a-Service
xpay's API monetization product that wraps any endpoint with pay-per-call pricing, enabling API providers to accept payments from AI agents.
Spending Controls
Configurable limits on agent transactions including per-agent budgets, rate limits, allowed tools, and time-based restrictions.
Pay-Per-Call Pricing
A billing model where you pay only for the API calls you make. No subscriptions, no monthly fees. Each tool call is priced individually.
x402 Protocol
A payment protocol using HTTP 402 "Payment Required" status codes to enable micropayments between machines. xpay uses x402 under the hood to settle payments.
Non-custodial
An architecture where the platform never holds user funds. xpay facilitates peer-to-peer payments but never takes custody of assets.
Tool Calling
The mechanism by which AI agents invoke external services (APIs, databases, etc.) to accomplish tasks. xpay adds payment and spending controls to tool calls.
USDC
USD Coin, a stablecoin pegged 1:1 to the US dollar. xpay uses USDC for settlement, but developers interact with simple dollar-denominated pricing.
Frequently Asked Questions
Common questions about xpay✦ tools, pricing, and monetization.
xpay gives AI agents pay-per-use access to 1,000+ API tools from 80+ providers, lets developers monetize any API or MCP server, and adds spending controls so autonomous agents never overspend. Think of it as a tool marketplace + billing layer + financial guardrails for AI agents.
Sign up at xpay.tools — you get $5 in free credits immediately, no credit card required. Browse tools, grab your API key, and start calling tools via MCP or REST in under 5 minutes.
Over 1,000 API tools from 80+ providers including Exa (web search), Hunter (email enrichment), Apollo (contact data), Firecrawl (web scraping), Replicate (AI models), and many more. New tools are added weekly. Browse the full catalog at xpay.tools.
Every tool has a per-call price shown upfront — typically $0.001 to $0.10 per call. You only pay for what you use. No subscriptions, no monthly minimums. Add credits via Stripe (card) or USDC.
Register your API or MCP server on xpay, set per-tool pricing, and get a proxy endpoint. AI agents discover your tools through the hub and pay per call. You earn from every call without handling billing yourself.
Smart Proxy is a gateway that wraps agent API calls with spending controls. Set per-agent budgets, rate limits, and allowed tools. If an agent tries to exceed its budget, Smart Proxy blocks the request before any payment is made. All enforcement happens at the edge with sub-200ms latency.
No. xpay is non-custodial by design. Payments settle peer-to-peer between agents and service providers in USDC on Base. We never hold your funds.
No. xpay abstracts all blockchain complexity. You see dollar-denominated pricing, pay with a credit card or USDC, and call tools via standard MCP or REST APIs. The x402 protocol and USDC settlement happen under the hood.
xpay works with any framework that supports MCP or REST APIs — including Claude (via MCP), LangChain, CrewAI, AutoGPT, OpenAI Assistants, n8n, and Activepieces. If your agent can make HTTP calls, it works with xpay.
Instead of signing up for 10+ API providers, managing 10+ API keys, and paying 10+ monthly subscriptions, you get one xpay API key that accesses 1,000+ tools with pay-per-call pricing. One connection, one bill, one set of spending controls.