File size: 4,092 Bytes
bde2f3a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | """x402 Framework Adapter — base class for all AI framework integrations.
Same pattern for every framework:
1. Wrap a tool call
2. Check if user has credits/trials
3. If not, create invoice and request payment
4. Execute tool
5. Deduct credits
Developer writes normal code. x402 handles the payment transparently.
"""
from __future__ import annotations
import json
import logging
import os
from abc import ABC, abstractmethod
from typing import Any, Callable, Optional
import httpx
logger = logging.getLogger("x402.framework")
X402_BASE_URL = os.getenv("X402_BASE_URL", "https://mcp.rugmunch.io/mcp/x402")
class x402Adapter(ABC):
"""Base adapter for AI framework x402 integration.
Args:
api_key: x402 API key for authenticated access
base_url: x402 MCP endpoint URL
auto_pay: If True, automatically pay invoices (requires funded account)
max_budget_usd: Monthly budget cap (0 = unlimited)
"""
def __init__(
self,
api_key: str = "",
base_url: str = X402_BASE_URL,
auto_pay: bool = False,
max_budget_usd: float = 0,
):
self.api_key = api_key
self.base_url = base_url.rstrip("/")
self.auto_pay = auto_pay
self.max_budget_usd = max_budget_usd
self._spent_this_month: float = 0.0
self._client = httpx.Client(
headers={"X-API-Key": api_key} if api_key else {},
timeout=30,
)
self._cache: dict[str, Any] = {}
def _mcp_call(self, tool: str, arguments: dict) -> dict:
"""Call an x402 MCP tool."""
r = self._client.post(
self.base_url,
json={
"method": "tools/call",
"params": {"name": tool, "arguments": arguments},
},
)
data = r.json().get("result", {})
text = data.get("content", [{}])[0].get("text", "{}")
return json.loads(text) if isinstance(text, str) else text
def check_available(self, tool: str) -> tuple[bool, float, str]:
"""Check if a tool can be called — returns (available, price_usd, message).
First checks trials, then checks prepaid credits/budget.
"""
# Check trial availability
pricing = self._mcp_call("x402_check_balance", {"agent_id": f"framework:{id(self)}"})
if pricing.get("balances"):
for tid, bal in pricing["balances"].items():
if tid == tool and bal.get("remaining", 0) > 0:
return True, 0.0, "trial"
# Check budget
if self.max_budget_usd > 0 and self._spent_this_month >= self.max_budget_usd:
return False, 0.0, f"Monthly budget ${self.max_budget_usd} exhausted"
# Look up price
tools = self._mcp_call("x402_list_tools", {"category": ""})
for t in tools.get("tools", []):
if t.get("id") == tool:
price = t.get("price_usd", 0.01)
return True, price, "paid"
return False, 0.0, f"Unknown tool: {tool}"
def get_invoice(self, tool: str) -> dict:
"""Get a payment invoice for a tool. Returns invoice with amount and pay_to address."""
return self._mcp_call("x402_create_invoice", {"tool": tool, "agent_id": f"framework:{id(self)}"})
def record_usage(self, tool: str, cost_usd: float):
"""Record tool usage for budget tracking."""
self._spent_this_month += cost_usd
logger.info(f"x402: called {tool} — ${cost_usd:.4f} (monthly: ${self._spent_this_month:.2f})")
def list_tools(self, category: str = "") -> list[dict]:
"""List available tools with prices."""
return self._mcp_call("x402_list_tools", {"category": category}).get("tools", [])
@abstractmethod
def wrap_tool(self, tool_name: str, tool_func: Callable) -> Callable:
"""Wrap a tool function with x402 payment processing.
The returned function checks payment, calls the tool, deducts cost.
Framework-specific implementations handle the tool registration.
"""
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