AI agents need APIs without friction. Compare httpay's permissionless, pay-per-call model against every other option.
Every dimension that matters to AI agents and developers
| Feature | ⚡ httpay.xyz | Direct API Subs. | RapidAPI | nkmc.ai | Pylon API | Zapier / Make |
|---|---|---|---|---|---|---|
| 🔑Signup Required | None ★ Best |
Required Per provider |
Required RapidAPI account |
Optional CLI install needed |
Required Account + wallet |
Required Paid plans |
| 💳Payment Model | Pay-per-call $0.001–$0.005 USDC ★ Best |
Monthly sub $10–$500/mo typical |
Tier subscriptions Free tier + markups |
Varies No built-in payments |
Pay-per-call USDC on Base |
Monthly plans $20–$100+/mo |
| 🤖x402 Protocol | Native ✓ Auto-pay for agents ★ Best |
None | None | None | Yes x402 compatible |
None |
| 📦API Catalog Size | 57 services ~10,000+ endpoints ★ Best |
Single service 1 API per account |
40,000+ APIs But subscription-locked |
Limited CLI tooling focus |
~20 capabilities Smaller catalog |
5,000+ apps Workflow-focused |
| 🧪Free Demo Mode | Yes ?demo=true on any call ★ Best |
Sometimes Provider-dependent |
Free tier Rate-limited |
Local dev | Limited testing | Trial period Card required |
| 🔌MCP Server | Available npx @httpay/mcp ★ Best |
None | None | CLI-based | None | None |
| 📖Agent Discovery | Full suite llms.txt, agent.md, openapi.yaml ★ Best |
OpenAPI only If provided |
OpenAPI / Swagger | Docs only | OpenAPI | No agent context |
| ⚙️Setup Complexity | Zero Just send a request + USDC ★ Best |
High Account, keys, billing setup |
Medium Account + plan subscription |
Medium Local install required |
Low–Medium Wallet + account setup |
High Workflow builder + auth |
| 🌐HTTP Native | Yes Standard REST, agent-ready ★ Best |
Yes | Yes | CLI wrapper | Yes | Webhook only |
| 🔓Permissionless | Fully Any agent, any wallet ★ Best |
No Must be approved customer |
No Account + TOS |
Partial | Partial Wallet needed |
No Enterprise gating |
| 📉Rate Limits | Pay to scale No artificial caps ★ Best |
Plan-based Hit limit → upgrade plan |
Tier-based Strict per-plan limits |
Upstream limits | Per-capability | Hard limits Task quotas per plan |
| 🔗Blockchain / USDC | Native Base network USDC ★ Best |
None | None | None | USDC on Base | None |
What does it actually cost to run 1,000 calls? No hidden fees, no annual lock-ins.
Six properties that make httpay the only rational choice for autonomous agents
No registration. No API keys. No OAuth dance. An agent with a funded wallet can start calling APIs immediately — no human-in-the-loop approval steps.
httpay speaks the x402 protocol natively. Your agent gets a 402 Payment Required response, pays in USDC, and retries — all automatically.
Pay $0.001–$0.005 per call. Run 10 calls or 10 million — you pay exactly what you use. No wasted monthly fees, no tier upgrades.
From crypto prices and weather to web scraping, DeFi analytics, AI text, and geolocation — all behind a single unified gateway URL with consistent auth.
Append ?demo=true to any request for a free, realistic mock response. No wallet needed to explore the API.
Install npx @httpay/mcp to give Claude, GPT, or any MCP-compatible AI assistant direct access to all 57 services.
Where each option falls short for autonomous agent use cases
Signing up individually with each API provider (OpenWeather, CoinGecko, etc.)
API marketplace with 40,000+ APIs behind subscription tiers
CLI-based AI capability runner — not an HTTP API gateway
x402-compatible gateway with pay-per-call USDC payments
Workflow automation platforms that connect apps via triggers and actions
From zero to your first paid API call — no signup, no config files, just code.
npm install x402-fetch
import wrapFetchWithPayments from 'x402-fetch'; // Wrap fetch with your funded Base wallet private key const fetch = wrapFetchWithPayments(globalThis.fetch, { privateKey: process.env.WALLET_PRIVATE_KEY, // Base network wallet }); // Call any of 57 services — agent pays automatically via x402 const res = await fetch('https://httpay.xyz/api/gateway/open-meteo/forecast?latitude=40.71&longitude=-74.01'); const weather = await res.json(); console.log(weather.current); // Live weather data — cost: $0.001 USDC
// Add ?demo=true to any endpoint for a free mock response const res = await fetch('https://httpay.xyz/api/gateway/open-meteo/forecast?latitude=40.71&longitude=-74.01&demo=true'); // Returns realistic mock data — perfect for development & testing
Quick decision guide
npx @httpay/mcpCommon questions from developers and agents evaluating httpay
402 Payment Required response with a payment payload. Your wallet signs and sends a USDC microtransaction on Base, and the gateway immediately processes your request. No registration, no API keys, no session tokens. The wallet is your identity.?demo=true), a published MCP server (npx @httpay/mcp), and richer agent discovery files (llms.txt, agent.md, openapi.yaml). If catalog breadth matters, httpay wins.npx @httpay/mcp to start the MCP server. Add it to your Claude Desktop or any MCP-compatible client. Your AI assistant can then discover and call all 57 services directly — with automatic USDC micropayments via your configured wallet.x402-fetch library handles the payment signing automatically.Join the agents already using httpay. No signup, no commitment — just your wallet and a single HTTP call.