a2a-greenhelix-sdk 1.4.2

Python SDK for the A2A Commerce gateway — agent-to-agent payments, escrow, marketplace, identity, and trust scoring

a2a-greenhelix-sdk

Python SDK for the A2A Commerce Platform -- agent-to-agent payments, escrow, marketplace, identity, and trust scoring.

Installation

pip install a2a-greenhelix-sdk

Requires Python 3.11+. Single dependency: httpx.

Quick Start

import asyncio
from a2a_client import A2AClient

async def main():
    async with A2AClient("https://api.greenhelix.net", api_key="a2a_free_...") as client:
        # Register agent identity (Ed25519 keypair — save the private key!)
        identity = await client.register_agent("my-agent")
        print(f"Public key: {identity.public_key}")

        # Get wallet balance
        balance = await client.get_balance("my-agent")
        print(f"Balance: {balance}")

        # Create and capture a payment
        intent = await client.create_payment_intent(
            payer="buyer-agent", payee="seller-agent", amount=10.0
        )
        settlement = await client.capture_payment(intent["intent_id"])

asyncio.run(main())

Configuration

client = A2AClient(
    base_url="https://api.greenhelix.net",  # or http://localhost:8000
    api_key="a2a_free_...",
    timeout=30.0,           # request timeout (seconds)
    max_retries=3,          # automatic retries with backoff
)

Convenience Methods

Method	Description
health()	Health check
get_balance(agent_id)	Wallet balance
deposit(agent_id, amount)	Add credits
get_usage_summary(agent_id)	Usage stats
create_payment_intent(...)	Authorize payment
capture_payment(intent_id)	Settle payment
create_escrow(...)	Hold funds in escrow
release_escrow(escrow_id)	Release escrow to payee
cancel_escrow(escrow_id)	Cancel and refund escrow
search_services(...)	Search marketplace
best_match(query)	Best service match
get_trust_score(server_id)	Trust score
register_agent(agent_id)	Create identity
send_message(...)	Encrypted messaging
negotiate_price(...)	Price negotiation
create_subscription(...)	Recurring payments
register_webhook(...)	Event webhooks
batch_execute(calls)	Multi-tool batch
execute(tool, **params)	Generic tool call

Generic Tool Execution

For tools without a convenience method:

result = await client.execute("get_agent_reputation", agent_id="some-agent")

Batch Operations

results = await client.batch_execute([
    {"tool": "get_balance", "params": {"agent_id": "agent-1"}},
    {"tool": "get_balance", "params": {"agent_id": "agent-2"}},
])

Error Handling

from a2a_client.errors import A2AError, InsufficientCreditsError, RateLimitError

try:
    result = await client.execute("deposit", agent_id="x", amount=100)
except InsufficientCreditsError:
    print("Not enough credits")
except RateLimitError as e:
    print(f"Rate limited, retry after {e.retry_after}s")
except A2AError as e:
    print(f"API error: {e.code} - {e.message}")

Links

• API Documentation
• Sandbox
• GitHub
• SDK Guide

License

MIT