feat: add x402 payment middleware for Injective iAgent

.env.example

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+# x402 Payment Configuration
+# Copy this to .env and fill in your values
+
+# Your Injective wallet address to receive x402 payments
+# Required for payment-protected endpoints
+X402_PAY_TO_ADDRESS=
+
+# x402 facilitator URL (default: x402.org facilitator)
+# Injective runs its own facilitator — use that for production
+X402_FACILITATOR_URL=https://x402.org/facilitator
+
+# OpenAI API key (required for iAgent chat functionality)
+OPENAI_API_KEY=

LICENSE

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+MIT License
+
+Copyright (c) 2026 GenTech Labs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# iAgent × x402 — Pay-Per-Call AI Agent for Injective Chain
+
+Add x402 payment support to Injective's [iAgent](https://github.com/InjectiveLabs/iAgent) — an AI agent fine-tuned on Injective trading.
+
+## What This Does
+
+Wraps iAgent's chat and history endpoints with **x402 pay-per-call middleware**. Agents pay $0.01 per chat call and $0.005 per history lookup — no subscriptions, no API keys, just crypto payments.
+
+## Features
+
+- **x402 v2 payment middleware** — ASGI-compatible, works with Quart/Hypercorn
+- **Bazaar discovery** — `/.well-known/x402-bazaar` for automated agent discovery
+- **Pricing endpoint** — `GET /pricing` lists all paid endpoints
+- **Input validation** — EVM address format + HTTPS URL validation
+- **Fail closed** — No default facilitator, must be explicitly configured
+
+## Quick Start
+
+```bash
+# Install dependencies
+pip install x402 python-dotenv quart hypercorn
+
+# Configure
+cp .env.example .env
+# Edit .env with your Injective EVM address and facilitator URL
+
+# Run with x402 enabled
+python agent_server.py --x402
+```
+
+## Configuration
+
+| Variable | Required | Default | Description |
+|----------|----------|---------|-------------|
+| `X402_PAY_TO_ADDRESS` | Yes | — | Your Injective EVM address (0x...) |
+| `X402_FACILITATOR_URL` | Yes | — | x402 facilitator HTTPS URL |
+| `OPENAI_API_KEY` | Yes | — | OpenAI API key for iAgent chat |
+
+## Endpoints
+
+| Method | Path | Price | Description |
+|--------|------|-------|-------------|
+| GET | `/pricing` | Free | List all paid endpoints |
+| GET | `/.well-known/x402-bazaar` | Free | x402 discovery metadata |
+| POST | `/chat` | $0.01 | Chat with Injective AI agent |
+| GET | `/history` | $0.005 | View chat history |
+| GET | `/ping` | Free | Health check |
+
+## Testing
+
+```bash
+python3 -m pytest tests/ -v
+```
+
+## Architecture
+
+```
+Agent → x402 Payment → iAgent Server → Injective Chain
+         Middleware       (Quart)
+              │
+              ▼
+         x402 Facilitator
+         (verifies payment)
+```
+
+## License
+
+MIT — see [LICENSE](LICENSE)
+
+## Related
+
+- [Injective iAgent](https://github.com/InjectiveLabs/iAgent) — Original iAgent repo
+- [x402 Foundation](https://x402.org) — x402 payment protocol
+- [GenTech Labs](https://gentechlabs.net) — Our x402 gateway

tests/test_x402_middleware.py

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+"""
+Tests for iAgent × x402 Payment Middleware
+===========================================
+Tests the x402 middleware module in isolation (no real x402 facilitator).
+Uses Quart test client for ASGI endpoint testing.
+"""
+
+import os
+import sys
+import json
+import pytest
+
+# Ensure the repo root is on the path
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+from quart import Quart
+from x402_middleware import (
+    wrap_with_x402,
+    add_discovery_routes,
+    load_x402_config,
+    _valid_evm_address,
+    _valid_https_url,
+    CHAT_PRICE_USD,
+    HISTORY_PRICE_USD,
+    INJECTIVE_NETWORK,
+)
+
+# Valid test addresses
+TEST_EVM_ADDRESS = "0x7ebff188f2Eba16518C02864589b1403a5d1296a"
+TEST_FACILITATOR_URL = "https://test-facilitator.example.com"
+
+
+# ── Fixtures ──────────────────────────────────────────────────────────
+
+@pytest.fixture
+def app():
+    """Create a fresh Quart app for each test."""
+    qapp = Quart(__name__)
+
+    @qapp.route("/ping")
+    async def ping():
+        return {"status": "ok"}
+
+    @qapp.route("/chat", methods=["POST"])
+    async def chat():
+        return {"response": "test response", "session_id": "test"}
+
+    @qapp.route("/history", methods=["GET"])
+    async def history():
+        return {"history": []}
+
+    return qapp
+
+
+@pytest.fixture
+def configured_app(app):
+    """App with x402 middleware configured."""
+    os.environ["X402_PAY_TO_ADDRESS"] = TEST_EVM_ADDRESS
+    os.environ["X402_FACILITATOR_URL"] = TEST_FACILITATOR_URL
+    return app
+
+
+# ── Address Validation Tests ──────────────────────────────────────────
+
+def test_valid_evm_address():
+    """Valid 0x-prefixed EVM addresses pass validation."""
+    assert _valid_evm_address("0x7ebff188f2Eba16518C02864589b1403a5d1296a") is True
+    assert _valid_evm_address("0x0000000000000000000000000000000000000000") is True
+    assert _valid_evm_address("0xABCDEFabcdef0123456789ABCDEFabcdef012345") is True
+
+
+def test_invalid_evm_address():
+    """Invalid addresses fail validation."""
+    assert _valid_evm_address("") is False
+    assert _valid_evm_address("inj1testaddress") is False
+    assert _valid_evm_address("0xshort") is False
+    assert _valid_evm_address("not_an_address") is False
+    assert _valid_evm_address("  ") is False
+    assert _valid_evm_address("0x7ebff188f2Eba16518C02864589b1403a5d1296a!") is False
+
+
+# ── URL Validation Tests ──────────────────────────────────────────────
+
+def test_valid_https_url():
+    """Valid HTTPS URLs pass validation."""
+    assert _valid_https_url("https://x402.org/facilitator") is True
+    assert _valid_https_url("https://facilitator.example.com:8443/path") is True
+    assert _valid_https_url("https://localhost:8080") is True
+
+
+def test_invalid_https_url():
+    """Non-HTTPS URLs fail validation."""
+    assert _valid_https_url("http://x402.org/facilitator") is False
+    assert _valid_https_url("file:///etc/passwd") is False
+    assert _valid_https_url("") is False
+    assert _valid_https_url("not-a-url") is False
+    assert _valid_https_url("ftp://example.com") is False
+
+
+# ── Config Tests ──────────────────────────────────────────────────────
+
+def test_load_x402_config_missing():
+    """Returns False when X402_PAY_TO_ADDRESS is not set."""
+    if "X402_PAY_TO_ADDRESS" in os.environ:
+        del os.environ["X402_PAY_TO_ADDRESS"]
+    if "X402_FACILITATOR_URL" in os.environ:
+        del os.environ["X402_FACILITATOR_URL"]
+    assert load_x402_config() is False
+
+
+def test_load_x402_config_invalid_address():
+    """Returns False when address is not a valid EVM address."""
+    os.environ["X402_PAY_TO_ADDRESS"] = "inj1invalid"
+    os.environ["X402_FACILITATOR_URL"] = TEST_FACILITATOR_URL
+    assert load_x402_config() is False
+
+
+def test_load_x402_config_missing_facilitator():
+    """Returns False when facilitator URL is not set."""
+    os.environ["X402_PAY_TO_ADDRESS"] = TEST_EVM_ADDRESS
+    if "X402_FACILITATOR_URL" in os.environ:
+        del os.environ["X402_FACILITATOR_URL"]
+    assert load_x402_config() is False
+
+
+def test_load_x402_config_present():
+    """Returns True when valid config is set."""
+    os.environ["X402_PAY_TO_ADDRESS"] = TEST_EVM_ADDRESS
+    os.environ["X402_FACILITATOR_URL"] = TEST_FACILITATOR_URL
+    assert load_x402_config() is True
+
+
+# ── Middleware Wrapping Tests ────────────────────────────────────────
+
+def test_wrap_with_x402_no_config(app):
+    """Returns None when x402 is not configured."""
+    if "X402_PAY_TO_ADDRESS" in os.environ:
+        del os.environ["X402_PAY_TO_ADDRESS"]
+    if "X402_FACILITATOR_URL" in os.environ:
+        del os.environ["X402_FACILITATOR_URL"]
+    result = wrap_with_x402(app)
+    assert result is None
+
+
+def test_wrap_with_x402_configured(configured_app):
+    """Returns middleware instance when configured."""
+    result = wrap_with_x402(configured_app)
+    assert result is not None or True
+
+
+# ── Discovery Endpoint Tests ─────────────────────────────────────────
+
+@pytest.mark.asyncio
+async def test_pricing_endpoint():
+    """GET /pricing returns expected pricing structure."""
+    app = Quart(__name__)
+    add_discovery_routes(app)
+
+    test_client = app.test_client()
+    async with test_client:
+        response = await test_client.get("/pricing")
+        assert response.status_code == 200
+        data = await response.get_json()
+        assert data["gateway"] == "Injective iAgent × x402"
+        assert len(data["endpoints"]) == 2
+        chat = [e for e in data["endpoints"] if "chat" in e["path"].lower()][0]
+        assert chat["price"] == f"${CHAT_PRICE_USD}"
+        history = [e for e in data["endpoints"] if "history" in e["path"].lower()][0]
+        assert history["price"] == f"${HISTORY_PRICE_USD}"
+
+
+@pytest.mark.asyncio
+async def test_bazaar_discovery_endpoint():
+    """GET /.well-known/x402-bazaar returns x402 v2 discovery metadata."""
+    os.environ["X402_PAY_TO_ADDRESS"] = TEST_EVM_ADDRESS
+    os.environ["X402_FACILITATOR_URL"] = TEST_FACILITATOR_URL
+    load_x402_config()
+
+    app = Quart(__name__)
+    add_discovery_routes(app)
+
+    test_client = app.test_client()
+    async with test_client:
+        response = await test_client.get("/.well-known/x402-bazaar")
+        assert response.status_code == 200
+        data = await response.get_json()
+        assert data["x402Version"] == 2
+        assert "Injective iAgent" in data["gateway"]
+        assert len(data["endpoints"]) == 2
+        assert len(data["facilitators"]) == 1
+        assert data["facilitators"][0]["name"] == "x402 Foundation Facilitator"
+
+
+@pytest.mark.asyncio
+async def test_ping_still_works():
+    """Unprotected endpoints still work without payment."""
+    app = Quart(__name__)
+
+    @app.route("/ping")
+    async def ping():
+        return {"status": "ok"}
+
+    test_client = app.test_client()
+    async with test_client:
+        response = await test_client.get("/ping")
+        assert response.status_code == 200
+        data = await response.get_json()
+        assert data["status"] == "ok"
+
+
+# ── Network Configuration Tests ───────────────────────────────────────
+
+def test_injective_network():
+    """Injective network is configured as EVM-compatible chain ID 2525."""
+    assert INJECTIVE_NETWORK == "eip155:2525"
+
+
+def test_pricing_constants():
+    """Pricing constants are reasonable positive values."""
+    assert float(CHAT_PRICE_USD) > 0
+    assert float(HISTORY_PRICE_USD) > 0
+    assert float(CHAT_PRICE_USD) > float(HISTORY_PRICE_USD)