ctxprotocol 0.8.3

Official Python SDK for the Context Protocol - Discover and execute AI tools programmatically

ctxprotocol

The Universal Adapter for AI Agents.

Connect your AI to the real world without managing API keys, hosting servers, or reading documentation.

Context Protocol is pip for AI capabilities. Just as you install packages to add functionality to your code, use the Context SDK to give your Agent instant access to thousands of live data sources and actions—from DeFi and Gas Oracles to Weather and Search.

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💰 $10,000 Developer Grant Program

We're funding the initial supply of MCP Tools for the Context Marketplace. Become a Data Broker.

• 🛠️ Build: Create an MCP Server using this SDK (Solana data, Trading tools, Scrapers, etc.)
• 📦 List: Publish it to the Context Registry
• 💵 Earn: Get a $250–$1,000 Grant + earn USDC every time an agent queries your tool

👉 View Open Bounties & Apply Here

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Why use Context?

• 🔌 One Interface, Everything: Stop integrating APIs one by one. Use a single SDK to access any tool in the marketplace.
• 🧠 Zero-Ops: We're a gateway to the best MCP tools. Just send the JSON and get the result.
• ⚡️ Agentic Discovery: Your Agent can search the marketplace at runtime to find tools it didn't know it needed.
• 💸 Dual-Surface Economics: Use Query for pay-per-response intelligence or Execute for session-budgeted method calls.

Who Is This SDK For?

Role	What You Use
AI Agent Developer	ctxprotocol — Query curated answers or Execute with explicit method pricing + sessions
Tool Contributor (Data Broker)	mcp + ctxprotocol — Standard MCP server + security middleware

Installation

pip install ctxprotocol

Or with optional FastAPI support:

pip install ctxprotocol[fastapi]

Prerequisites

Before using the API, complete setup at ctxprotocol.com:

1. Sign in — Creates your embedded wallet
2. Set spending cap — Approve USDC spending on the ContextRouter (one-time setup)
3. Fund wallet — Add USDC for tool execution fees
4. Generate API key — In Settings page

Two Modes: Precision vs Intelligence

The SDK offers two payment models to serve different use cases:

Mode	Method	Payment Model	Settlement Shape	Use Case
Execute	client.tools.execute()	Per execute call	Session accrual + deferred batch flush	Deterministic pipelines, raw outputs, explicit spend envelopes
Query	client.query.run()	Pay-per-response	Deferred post-response	Complex questions, multi-tool synthesis, curated intelligence

Execute mode gives you raw data and full control with explicit method pricing and session budgets:

session = await client.tools.start_session(max_spend_usd="2.00")
execute_tools = await client.discovery.search(
    "whale transactions",
    mode="execute",
    surface="execute",
    require_execute_pricing=True,
)

result = await client.tools.execute(
    tool_id=execute_tools[0].id,
    tool_name=execute_tools[0].mcp_tools[0].name,
    args={"chain": "base", "limit": 20},
    session_id=session.session.session_id,
)
print(result.session)  # method_price, spent, remaining, max_spend, ...

Query mode gives you curated answers — the server handles answer-safe tool discovery, multi-tool orchestration (up to 100 MCP calls per response turn), self-healing retries, completeness checks, model-aware context budgeting, and AI synthesis for one flat fee:

answer = await client.query.run(
    query="What are the top whale movements on Base?",
    model_id="glm-model",      # optional: choose a supported model
    query_depth="auto",        # optional: fast | auto | deep
    include_data_url=True,     # optional: persist full execution data to blob
)
print(answer.response)    # AI-synthesized answer
print(answer.tools_used)  # Which tools were used
print(answer.cost)        # Cost breakdown
print(answer.data_url)    # Optional blob URL with full data

Mixed listings are first-class: one listing can expose methods to both surfaces. Methods without _meta.pricing.executeUsd remain query-only until priced.

Compatibility: SDK/API payload fields such as price and price_per_query are retained for backward compatibility. In Query mode, they represent listing-level price per response turn. A future major release can add response-named aliases (for example, price_per_response) before deprecating legacy names.

Quick Start

import asyncio
from ctxprotocol import ContextClient

async def main():
    async with ContextClient(api_key="sk_live_...") as client:
        # Pay-per-response: Ask a question, get a curated answer
        answer = await client.query.run("What are the top whale movements on Base?")
        print(answer.response)

        # Execute surface: require explicit execute pricing
        tools = await client.discovery.search(
            "gas prices",
            mode="execute",
            surface="execute",
            require_execute_pricing=True,
        )
        session = await client.tools.start_session(max_spend_usd="1.00")
        result = await client.tools.execute(
            tool_id=tools[0].id,
            tool_name=tools[0].mcp_tools[0].name,
            args={"chainId": 1},
            session_id=session.session.session_id,
        )
        print(result.result)

asyncio.run(main())

See a full dual-surface client script in examples/two-surfaces-client.py.

Configuration

Client Options

Option	Type	Required	Default	Description
api_key	str	Yes	—	Your Context Protocol API key
base_url	str	No	https://www.ctxprotocol.com	API base URL (for development)
request_timeout_seconds	float	No	300.0	Timeout for non-streaming API calls
stream_timeout_seconds	float	No	600.0	Timeout for establishing streaming API calls

# Production
client = ContextClient(api_key=os.environ["CONTEXT_API_KEY"])

# Local development
client = ContextClient(
    api_key="sk_test_...",
    base_url="http://localhost:3000",
    request_timeout_seconds=420.0,
    stream_timeout_seconds=840.0,
)

API Reference

Discovery

client.discovery.search(query, limit?)

Search for tools with optional surface-aware filters.

tools = await client.discovery.search("ethereum gas", limit=10)

execute_tools = await client.discovery.search(
    "ethereum gas",
    mode="execute",
    surface="execute",
    require_execute_pricing=True,
)

client.discovery.get_featured(limit?, ...)

Get featured/popular tools.

featured = await client.discovery.get_featured(limit=5)
featured_execute = await client.discovery.get_featured(
    limit=5,
    mode="execute",
    require_execute_pricing=True,
)

Tools (Execute Surface)

Session lifecycle helpers use the canonical execute-scoped API contract: /api/v1/tools/execute/sessions...

client.tools.execute(tool_id, tool_name, args?)

Execute a single tool method. Execute calls can run inside session budgets.

session = await client.tools.start_session(max_spend_usd="2.50")

result = await client.tools.execute(
    tool_id="uuid-of-tool",
    tool_name="get_gas_prices",
    args={"chainId": 1},
    session_id=session.session.session_id,
)
print(result.method.execute_price_usd)
print(result.session)

client.tools.start_session(max_spend_usd)

started = await client.tools.start_session(max_spend_usd="5.00")

client.tools.get_session(session_id)

status = await client.tools.get_session("sess_123")

client.tools.close_session(session_id)

closed = await client.tools.close_session("sess_123")

Query (Pay-Per-Response)

client.query.run(query, tools?, model_id?, include_data?, include_data_url?, query_depth?, idempotency_key?)

Run an agentic query. The server discovers answer-safe tools, executes the full pipeline (up to 100 MCP calls per response turn), applies model-aware mediator/data budgeting, and returns an AI-synthesized answer.

query_depth controls orchestration depth:

• fast: lower-latency path for simple lookups.
• auto: server routes to either fast or deep from query intent + selected tool complexity.
• deep: completeness-oriented path (default when omitted).

# Simple string
answer = await client.query.run("What are the top whale movements on Base?")

# With specific tools
answer = await client.query.run(
    query="Analyze whale activity on Base",
    tools=["tool-uuid-1", "tool-uuid-2"],  # optional — auto-discover if omitted
    model_id="kimi-model-thinking",          # optional
    query_depth="auto",                      # optional: fast | auto | deep
    include_data=True,                       # optional: include execution data inline
    include_data_url=True,                   # optional: include blob URL for full data
)

print(answer.response)      # AI-synthesized text
print(answer.tools_used)    # [QueryToolUsage(id, name, skill_calls)]
print(answer.cost)          # QueryCost(model_cost_usd, tool_cost_usd, total_cost_usd)
print(answer.duration_ms)   # Total time
print(answer.data)          # Optional execution data (when include_data=True)
print(answer.data_url)      # Optional blob URL (when include_data_url=True)

When retrieval-first synthesis rollout is enabled server-side, full-data or truncation-sensitive query requests can switch to retrieval-first context assembly using private stage artifacts and canonical execution data slices. include_data and include_data_url continue to reference the same canonical dataset used for synthesis.

client.query.stream(query, tools?, model_id?, include_data?, include_data_url?, query_depth?, idempotency_key?)

Same as run() but streams events in real-time via SSE.

async for event in client.query.stream(
    query="What are the top whale movements?",
    query_depth="fast",
):
    if event.type == "tool-status":
        print(f"Tool {event.tool.name}: {event.status}")
    elif event.type == "text-delta":
        print(event.delta, end="")
    elif event.type == "done":
        print(f"\nTotal cost: {event.result.cost.total_cost_usd}")

Types

from ctxprotocol import (
    # Auth utilities for tool contributors
    verify_context_request,
    is_protected_mcp_method,
    is_open_mcp_method,
    
    # Client types
    ContextClientOptions,
    Tool,
    McpTool,
    ExecuteOptions,
    ExecutionResult,
    ContextErrorCode,
    
    # Auth types (for MCP server contributors)
    VerifyRequestOptions,
    
    # Context types (for MCP server contributors receiving injected data)
    ContextRequirementType,
    HyperliquidContext,
    PolymarketContext,
    WalletContext,
    UserContext,
)

Error Handling

The SDK raises ContextError with specific error codes:

from ctxprotocol import ContextClient, ContextError

try:
    result = await client.tools.execute(...)
except ContextError as e:
    match e.code:
        case "no_wallet":
            # User needs to set up wallet
            print(f"Setup required: {e.help_url}")
        case "insufficient_allowance":
            # User needs to set a spending cap
            print(f"Set spending cap: {e.help_url}")
        case "payment_failed":
            # Insufficient USDC balance
            pass
        case "execution_failed":
            # Tool execution error
            pass

Error Codes

Code	Description	Handling
unauthorized	Invalid API key	Check configuration
no_wallet	Wallet not set up	Direct user to help_url
insufficient_allowance	Spending cap not set	Direct user to help_url
payment_failed	USDC payment failed	Check balance
execution_failed	Tool error	Retry with different args

🔒 Securing Your Tool (MCP Contributors)

If you're building an MCP server (tool contributor), verify incoming requests:

Quick Implementation with FastAPI

from fastapi import FastAPI, Request, Depends, HTTPException
from ctxprotocol import create_context_middleware, ContextError

app = FastAPI()
verify_context = create_context_middleware(audience="https://your-tool.com/mcp")

@app.post("/mcp")
async def handle_mcp(request: Request, context: dict = Depends(verify_context)):
    # context contains verified JWT payload (on protected methods)
    # None for open methods like tools/list
    body = await request.json()
    # Handle MCP request...

Manual Verification

from ctxprotocol import verify_context_request, is_protected_mcp_method, ContextError

# Check if a method requires auth
if is_protected_mcp_method(body["method"]):
    try:
        payload = await verify_context_request(
            authorization_header=request.headers.get("authorization"),
            audience="https://your-tool.com/mcp",  # optional
        )
        # payload contains verified JWT claims
    except ContextError as e:
        # Handle authentication error
        raise HTTPException(status_code=401, detail="Unauthorized")

MCP Security Model

The SDK implements a selective authentication model — discovery is open, execution is protected:

MCP Method	Auth Required	Why
initialize	❌ No	Session setup
tools/list	❌ No	Discovery - agents need to see your schemas
resources/list	❌ No	Discovery
prompts/list	❌ No	Discovery
tools/call	✅ Yes	Execution - costs money, runs your code

What this means in practice:

• ✅ https://your-mcp.com/mcp + initialize → Works without auth
• ✅ https://your-mcp.com/mcp + tools/list → Works without auth
• ❌ https://your-mcp.com/mcp + tools/call → Requires Context Protocol JWT

This matches standard API patterns (OpenAPI schemas are public, GraphQL introspection is open).

Execution Timeout & Product Design

⚠️ Important: MCP tool execution has a ~60 second timeout (enforced at the platform/client level, not by MCP itself). This is intentional—it encourages building pre-computed insight products rather than raw data access.

Best practice: Run heavy queries offline (via cron jobs), store results in your database, and serve instant results via MCP. This is how Bloomberg, Nansen, and Arkham work.

# ❌ BAD: Raw access (timeout-prone, no moat)
{"name": "run_sql", "description": "Run any SQL against blockchain data"}

# ✅ GOOD: Pre-computed product (instant, defensible)
{"name": "get_smart_money_wallets", "description": "Top 100 wallets that timed market tops"}

See the full documentation for detailed guidance.

Context Injection (Personalized Tools)

For tools that analyze user data, Context automatically injects user context:

from ctxprotocol import CONTEXT_REQUIREMENTS_KEY, HyperliquidContext

# Define tool with context requirements
TOOLS = [{
    "name": "analyze_my_positions",
    "description": "Analyze your positions with personalized insights",
    "_meta": {
        "contextRequirements": ["hyperliquid"],
        "rateLimit": {
            "maxRequestsPerMinute": 30,
            "cooldownMs": 2000,
            "maxConcurrency": 1,
            "supportsBulk": True,
            "recommendedBatchTools": ["get_portfolio_snapshot"],
            "notes": "Hobby tier: use snapshot endpoints before fan-out loops.",
        },
    },
    "inputSchema": {
        "type": "object",
        "properties": {
            "portfolio": {
                "type": "object",
                "description": "Portfolio context (injected by platform)",
            },
        },
        "required": ["portfolio"],
    },
}]

# Your handler receives typed context
async def handle_analyze_positions(portfolio: HyperliquidContext):
    positions = portfolio.perp_positions
    account = portfolio.account_summary
    # ... analyze and return insights

Links

• Context Protocol — Main website
• Documentation
• GitHub — This SDK
• TypeScript SDK — For Node.js
• PyPI Package

Requirements

• Python 3.10+
• httpx
• pydantic
• pyjwt[crypto]

License

MIT