AiPayGen

Pay-per-use Claude AI API for autonomous agents. 106 tools and 140+ endpoints, USDC micropayments on Base via x402, no API keys or signups required.

How it works

1. Agent calls any endpoint (e.g. POST /research)
2. First 10 calls/day are free — no payment needed
3. After that, the server returns HTTP 402 with payment instructions
4. Agent signs a USDC transaction on Base and retries with an X-Payment header
5. Server verifies payment via CDP x402 and returns the result

Agent ──POST /research──▶ AiPayGen ──402 + payment info──▶ Agent
Agent ──POST /research + X-Payment──▶ AiPayGen ──200 + result──▶ Agent

Quick start

Try free (no setup)

curl -X POST https://api.aipaygen.com/preview \
  -H "Content-Type: application/json" \
  -d '{"query": "What is x402?"}'

Python

pip install aipaygen-langchain

from aipaygen_langchain import AiPayGenToolkit

tools = AiPayGenToolkit(x402_token="your_token").get_tools()
# Use with LangChain agents, CrewAI, etc.

JavaScript / TypeScript

npm install aipaygen

import { AiPayGen } from "aipaygen";
const client = new AiPayGen({ token: "your_token" });
const result = await client.research("quantum computing trends");

MCP Server (Claude Desktop, Cursor, etc.)

Connect as a remote MCP server — no local install:

https://mcp.aipaygen.com/mcp

Or run locally:

pip install aipaygen-mcp
aipaygen-mcp

Claude Desktop config:

{
  "mcpServers": {
    "aipaygen": {
      "command": "aipaygen-mcp"
    }
  }
}

Endpoints

AI / NLP

Endpoint	Method	Description
/research	POST	Deep research on any topic
/summarize	POST	Compress text (bullets, paragraph, TLDR)
/analyze	POST	Structured analysis with findings
/translate	POST	Translate to any language
/sentiment	POST	Polarity, score, emotions
/keywords	POST	Extract keywords and topics
/classify	POST	Classify into custom categories
/rewrite	POST	Rewrite for audience or voice
/extract	POST	Pull structured JSON from text
/qa	POST	Q&A over a document
/code	POST	Generate code in any language
/diagram	POST	Generate Mermaid diagrams
/chain	POST	Multi-step AI pipelines

Web Intelligence

Endpoint	Method	Description
/scrape	POST	Scrape any webpage
/search	POST	Web search with AI summary
/research	POST	Deep multi-source research
/extract/{url}	GET	Extract structured data from URL
/scrape/tweets	POST	Search and scrape tweets
/scrape/google-maps	POST	Google Maps business data

Agent Memory

Endpoint	Method	Description
/memory/set	POST	Store persistent key-value data
/memory/get	POST	Retrieve stored data
/memory/search	POST	Search memories by keyword

Discovery

Endpoint	Method	Description
/discover	GET	Full endpoint catalog
/catalog	GET	Browse discovered APIs
/openapi.json	GET	OpenAPI 3.0 spec
/llms.txt	GET	LLMs.txt for AI agents
/.well-known/agent.json	GET	Agent discovery manifest
/preview	POST	Free 120-token Claude demo

Full list: api.aipaygen.com/discover

Architecture

• Runtime: Flask + Gunicorn on Raspberry Pi 5
• AI: Claude Haiku 4.5 via Anthropic API
• Payments: x402 protocol, USDC on Base Mainnet, verified via CDP
• Tunnel: Cloudflare Tunnel → api.aipaygen.com
• Storage: SQLite (memory, usage tracking, API keys)
• Discovery: OpenAPI, LLMs.txt, MCP, agents.json, ai-plugin.json

Links

Resource	URL
Live API	https://api.aipaygen.com
Discover endpoints	https://api.aipaygen.com/discover
OpenAPI spec	https://api.aipaygen.com/openapi.json
LLMs.txt	https://api.aipaygen.com/llms.txt
MCP server	https://mcp.aipaygen.com/mcp
Blog	https://api.aipaygen.com/blog
npm SDK	https://www.npmjs.com/package/aipaygen
PyPI (LangChain)	https://pypi.org/project/aipaygen-langchain/
PyPI (LlamaIndex)	https://pypi.org/project/aipaygen-llamaindex/

License

MIT