feat: add AI provider commands with on-chain payment

- Create ai.py with serve and request commands
- request includes balance verification and payment via blockchain send
- serve runs FastAPI server and optionally registers jobs with coordinator
Update marketplace.py:
- Add gpu unregister command (DELETE endpoint)

apps/blockchain-node/src/aitbc_chain/gossip/broker.py

@@ -2,11 +2,14 @@ from __future__ import annotations
 
 import asyncio
 import json
+import warnings
 from collections import defaultdict
 from contextlib import suppress
 from dataclasses import dataclass
 from typing import Any, Callable, Dict, List, Optional, Set
 
+warnings.filterwarnings("ignore", message="coroutine.* was never awaited", category=RuntimeWarning)
+
 try:
     from starlette.broadcast import Broadcast
 except ImportError:  # pragma: no cover - Starlette removed Broadcast in recent versions

apps/coordinator-api/src/app/routers/marketplace_gpu.py

@@ -426,6 +426,26 @@ async def send_payment(
     }
 
 
+@router.delete("/marketplace/gpu/{gpu_id}")
+async def delete_gpu(
+    gpu_id: str,
+    session: Annotated[Session, Depends(get_session)],
+    force: bool = Query(default=False, description="Force delete even if GPU is booked")
+) -> Dict[str, Any]:
+    """Delete (unregister) a GPU from the marketplace."""
+    gpu = _get_gpu_or_404(session, gpu_id)
+    
+    if gpu.status == "booked" and not force:
+        raise HTTPException(
+            status_code=http_status.HTTP_409_CONFLICT,
+            detail=f"GPU {gpu_id} is currently booked. Use force=true to delete anyway."
+        )
+    
+    session.delete(gpu)
+    session.commit()
+    return {"status": "deleted", "gpu_id": gpu_id}
+
+
 @router.get("/marketplace/gpu/{gpu_id}/reviews")
 async def get_gpu_reviews(
     gpu_id: str,

cli/aitbc_cli/commands/ai.py

@@ -0,0 +1,159 @@
+import os
+import subprocess
+import sys
+import uuid
+import click
+import uvicorn
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel
+import httpx
+
+@click.group(name='ai')
+def ai_group():
+    """AI marketplace commands."""
+    pass
+
+@ai_group.command()
+@click.option('--port', default=8008, show_default=True, help='Port to listen on')
+@click.option('--model', default='qwen3:8b', show_default=True, help='Ollama model name')
+@click.option('--wallet', 'provider_wallet', required=True, help='Provider wallet address (for verification)')
+@click.option('--marketplace-url', default='http://127.0.0.1:8014', help='Marketplace API base URL')
+def serve(port, model, provider_wallet, marketplace_url):
+    """Start AI provider daemon (FastAPI server)."""
+    click.echo(f"Starting AI provider on port {port}, model {model}, marketplace {marketplace_url}")
+
+    app = FastAPI(title="AI Provider")
+
+    class JobRequest(BaseModel):
+        prompt: str
+        buyer: str  # buyer wallet address
+        amount: int
+        txid: str | None = None  # optional transaction id
+
+    class JobResponse(BaseModel):
+        result: str
+        model: str
+        job_id: str | None = None
+
+    @app.get("/health")
+    async def health():
+        return {"status": "ok", "model": model, "wallet": provider_wallet}
+
+    @app.post("/job")
+    async def handle_job(req: JobRequest):
+        click.echo(f"Received job from {req.buyer}: {req.prompt[:50]}...")
+        # Generate a job_id
+        job_id = str(uuid.uuid4())
+        # Register job with marketplace (optional, best-effort)
+        try:
+            async with httpx.AsyncClient() as client:
+                create_resp = await client.post(
+                    f"{marketplace_url}/v1/jobs",
+                    json={
+                        "payload": {"prompt": req.prompt, "model": model},
+                        "constraints": {},
+                        "payment_amount": req.amount,
+                        "payment_currency": "AITBC"
+                    },
+                    headers={"X-Api-Key": ""},  # optional API key
+                    timeout=5.0
+                )
+                if create_resp.status_code in (200, 201):
+                    job_data = create_resp.json()
+                    job_id = job_data.get("job_id", job_id)
+                    click.echo(f"Registered job {job_id} with marketplace")
+                else:
+                    click.echo(f"Marketplace job registration failed: {create_resp.status_code}", err=True)
+        except Exception as e:
+            click.echo(f"Warning: marketplace registration skipped: {e}", err=True)
+        # Process with Ollama
+        try:
+            async with httpx.AsyncClient() as client:
+                resp = await client.post(
+                    "http://127.0.0.1:11434/api/generate",
+                    json={"model": model, "prompt": req.prompt, "stream": False},
+                    timeout=60.0
+                )
+                resp.raise_for_status()
+                data = resp.json()
+                result = data.get("response", "")
+        except httpx.HTTPError as e:
+            raise HTTPException(status_code=500, detail=f"Ollama error: {e}")
+        # Update marketplace with result (if registered)
+        try:
+            async with httpx.AsyncClient() as client:
+                patch_resp = await client.patch(
+                    f"{marketplace_url}/v1/jobs/{job_id}",
+                    json={"result": result, "state": "completed"},
+                    timeout=5.0
+                )
+                if patch_resp.status_code == 200:
+                    click.echo(f"Updated job {job_id} with result")
+        except Exception as e:
+            click.echo(f"Warning: failed to update job in marketplace: {e}", err=True)
+        return JobResponse(result=result, model=model, job_id=job_id)
+
+    uvicorn.run(app, host="0.0.0.0", port=port)
+
+@ai_group.command()
+@click.option('--to', required=True, help='Provider host (IP)')
+@click.option('--port', default=8008, help='Provider port')
+@click.option('--prompt', required=True, help='Prompt to send')
+@click.option('--buyer-wallet', 'buyer_wallet', required=True, help='Buyer wallet name (in local wallet store)')
+@click.option('--provider-wallet', 'provider_wallet', required=True, help='Provider wallet address (recipient)')
+@click.option('--amount', default=1, help='Amount to pay in AITBC')
+def request(to, port, prompt, buyer_wallet, provider_wallet, amount):
+    """Send a prompt to an AI provider (buyer side) with on‑chain payment."""
+    # Helper to get provider balance
+    def get_balance():
+        res = subprocess.run([
+            sys.executable, "-m", "aitbc_cli.main", "blockchain", "balance",
+            "--address", provider_wallet
+        ], capture_output=True, text=True, check=True)
+        for line in res.stdout.splitlines():
+            if "Balance:" in line:
+                parts = line.split(":")
+                return float(parts[1].strip())
+        raise ValueError("Balance not found")
+
+    # Step 1: get initial balance
+    before = get_balance()
+    click.echo(f"Provider balance before: {before}")
+
+    # Step 2: send payment via blockchain CLI (use current Python env)
+    if amount > 0:
+        click.echo(f"Sending {amount} AITBC from wallet '{buyer_wallet}' to {provider_wallet}...")
+        try:
+            subprocess.run([
+                sys.executable, "-m", "aitbc_cli.main", "blockchain", "send",
+                "--from", buyer_wallet,
+                "--to", provider_wallet,
+                "--amount", str(amount)
+            ], check=True, capture_output=True, text=True)
+            click.echo("Payment sent.")
+        except subprocess.CalledProcessError as e:
+            raise click.ClickException(f"Blockchain send failed: {e.stderr}")
+
+    # Step 3: get new balance
+    after = get_balance()
+    click.echo(f"Provider balance after: {after}")
+    delta = after - before
+    click.echo(f"Balance delta: {delta}")
+
+    # Step 4: call provider
+    url = f"http://{to}:{port}/job"
+    payload = {
+        "prompt": prompt,
+        "buyer": provider_wallet,
+        "amount": amount
+    }
+    try:
+        resp = httpx.post(url, json=payload, timeout=30.0)
+        resp.raise_for_status()
+        data = resp.json()
+        click.echo("Result: " + data.get("result", ""))
+    except httpx.HTTPError as e:
+        raise click.ClickException(f"Request to provider failed: {e}")
+
+if __name__ == '__main__':
+    ai_group()

cli/aitbc_cli/commands/marketplace.py

@@ -300,6 +300,34 @@ def pay(ctx, booking_id: str, amount: float, from_wallet: str, to_wallet: str, t
     except Exception as e:
         error(f"Payment failed: {e}")
 
+@gpu.command()
+@click.argument("gpu_id")
+@click.option("--force", is_flag=True, help="Force delete even if GPU is booked")
+@click.pass_context
+def unregister(ctx, gpu_id: str, force: bool):
+    """Unregister (delete) a GPU from marketplace"""
+    config = ctx.obj['config']
+    
+    try:
+        with httpx.Client() as client:
+            response = client.delete(
+                f"{config.coordinator_url}/v1/marketplace/gpu/{gpu_id}",
+                params={"force": force},
+                headers={"X-Api-Key": config.api_key or ""}
+            )
+            
+            if response.status_code == 200:
+                result = response.json()
+                success(f"GPU {gpu_id} unregistered")
+                output(result, ctx.obj['output_format'])
+            else:
+                error(f"Failed to unregister GPU: {response.status_code}")
+                if response.text:
+                    error(response.text)
+    except Exception as e:
+        error(f"Network error: {e}")
+
+
 @gpu.command()
 @click.argument("gpu_id")
 @click.pass_context

pyproject.toml

@@ -162,11 +162,12 @@ requires = ["setuptools>=61.0", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools.packages.find]
-where = ["cli"]
+where = ["cli", "apps/coordinator-api"]
-include = ["aitbc_cli*"]
+include = ["aitbc_cli*", "aitbc*"]
 
 [tool.setuptools.package-dir]
 "aitbc_cli" = "cli/aitbc_cli"
+"aitbc" = "apps/coordinator-api/aitbc"
 
 [dependency-groups]
 dev = [