SDK de Python de MERX: cero dependencias, potencia completa

The MERX Python SDK provides a complete interface to the MERX TRON energy exchange using only the Python standard library - no requests, no httpx, no aiohttp. This article covers the four SDK modules (prices, orders, balance, webhooks), every method with working examples, the dataclass type system, manejo de errores, and a comparison with the JavaScript SDK for teams that use both languages.

Why Zero Dependencies

Most Python HTTP clients pull in a dependency tree. The requests library alone brings in urllib3, certifi, charset-normalizer, and idna. For a lightweight SDK that makes a handful of API calls, that overhead is unnecessary.

The MERX Python SDK uses only urllib.request from the standard library. Esto significa:

No dependency conflicts in your virtual environment
No supply chain attack surface from third-party packages
Works on any Python 3.10+ installation without pip install overhead
Deployable to restricted environments where installing packages is difficult

The tradeoff is the absence of async support. The SDK uses synchronous HTTP calls. If you need async, the REST API is simple enough to call directly with aiohttp or httpx using the patterns shown in this article.

Installation

pip install merx-sdk

That is it. No dependencies will be installed alongside it.

Quick Start

from merx import MerxClient

client = MerxClient(api_key="sk_live_your_key_here")

# Check current prices
prices = client.prices.list()
for p in prices:
    if p.energy_prices:
        print(f"{p.provider}: {p.energy_prices[0].price_sun} SUN/energy")

# Buy energy
order = client.orders.create(
    resource_type="ENERGY",
    amount=65000,
    target_address="TYourTargetAddressHere",
    duration_sec=3600,
)
print(f"Order {order.id}: {order.status}")

The client is initialized with your clave de API from the MERX dashboard at merx.exchange. The optional base_url parameter defaults to https://merx.exchange.

client = MerxClient(
    api_key="sk_live_your_key_here",
    base_url="https://merx.exchange",  # Optional
)

The Type System

Every API response is parsed into a Python dataclass. No raw dictionaries, no untyped data. Your IDE gets full autocompletion and your type checker catches errors before runtime.

The SDK exports 16 dataclass types:

from merx import (
    Balance,
    DepositInfo,
    Fill,
    HistoryEntry,
    HistorySummary,
    Order,
    OrderPreview,
    OrderWithFills,
    PreviewMatch,
    PriceHistoryEntry,
    PricePoint,
    PriceStats,
    ProviderPrice,
    Webhook,
    Withdrawal,
    MerxError,
)

Key Type Definitions

@dataclass
class PricePoint:
    duration_sec: int
    price_sun: int

@dataclass
class ProviderPrice:
    provider: str
    is_market: bool
    energy_prices: list[PricePoint]
    bandwidth_prices: list[PricePoint]
    available_energy: int
    available_bandwidth: int
    fetched_at: int

@dataclass
class Order:
    id: str
    resource_type: str       # "ENERGY" or "BANDWIDTH"
    order_type: str          # "MARKET", "LIMIT", "PERIODIC", "BROADCAST"
    status: str              # "PENDING", "EXECUTING", "FILLED", "FAILED", "CANCELLED"
    amount: int
    target_address: str
    duration_sec: int
    total_cost_sun: Optional[int] = None
    total_fee_sun: Optional[int] = None
    created_at: str = ""
    filled_at: Optional[str] = None
    expires_at: Optional[str] = None

@dataclass
class Fill:
    provider: str
    amount: int
    price_sun: int
    cost_sun: int
    tx_id: Optional[str] = None
    status: str = ""
    delegation_tx: Optional[str] = None
    verified: bool = False
    tronscan_url: Optional[str] = None

All dataclasses use standard Python type hints. Fields with defaults are optional API response fields that may not be present in every response.

Module 1: Prices

The prices module provides five methods for querying tiempo real and historical price data. All price endpoints are public and do not require authentication, but the SDK always sends the clave de API header for consistency.

prices.list()

Returns current pricing from all active providers.

prices = client.prices.list()

for p in prices:
    print(f"\n{p.provider} (market={p.is_market}):")
    print(f"  Available energy: {p.available_energy:,}")
    for tier in p.energy_prices:
        hours = tier.duration_sec // 3600
        print(f"  {hours}h: {tier.price_sun} SUN/unit")

Returns list[ProviderPrice]. Each entry includes the provider name, whether it supports market orders with flexible durations, price tiers for energy and bandwidth, and current available capacity.

prices.best(resource, amount=None)

Returns the cheapest available price for a resource type.

best = client.prices.best("ENERGY")
print(f"Cheapest: {best.price_sun} SUN from {best.provider}")

# Only providers with at least 200,000 available
best_large = client.prices.best("ENERGY", amount=200000)

Returns PriceHistoryEntry. The amount parameter filters out providers that lack sufficient capacity.

prices.history(provider=None, resource=None, period="24h")

Returns historical price snapshots for charting and analysis.

history = client.prices.history(
    provider="sohu",
    resource="ENERGY",
    period="7d",
)

for entry in history:
    print(f"{entry.polled_at}: {entry.price_sun} SUN ({entry.available:,} available)")

Returns list[PriceHistoryEntry]. Available periods: "1h", "6h", "24h", "7d", "30d".

prices.stats()

Returns aggregate market statistics.

stats = client.prices.stats()
print(f"Best price: {stats.best_price_sun} SUN")
print(f"Average price: {stats.avg_price_sun} SUN")
print(f"Providers online: {stats.total_providers}")
print(f"Cheapest-provider changes (24h): {stats.cheapest_changes_24h}")

Returns PriceStats.

prices.preview(resource, amount, duration, max_price_sun=None)

Previews what an order would cost before placing it.

preview = client.prices.preview(
    resource="ENERGY",
    amount=100000,
    duration=86400,       # 24 hours
    max_price_sun=35,     # Optional ceiling
)

if preview.best:
    print(f"Best: {preview.best.provider}")
    print(f"Cost: {preview.best.cost_trx} TRX")
    print(f"Price: {preview.best.price_sun} SUN/unit")

for fb in preview.fallbacks:
    print(f"Alternative: {fb.provider} at {fb.cost_trx} TRX")

if preview.no_providers:
    print("No providers available for these parameters")

Returns OrderPreview with a best match (or None), a list of fallbacks, and a no_providers boolean.

Module 2: Orders

orders.create(...)

Creates an energy or bandwidth order.

order = client.orders.create(
    resource_type="ENERGY",
    amount=65000,
    target_address="TYourTargetAddress",
    duration_sec=3600,
    order_type="MARKET",           # Default
    max_price_sun=None,            # Required for LIMIT orders
    idempotency_key="unique-id",   # Prevents duplicate orders
)

print(f"Order {order.id}: {order.status}")

Returns Order. Note that unlike the JavaScript SDK where parameters are passed as a dictionary, the Python SDK uses explicit keyword arguments for clarity.

The idempotency_key parameter is critical for production systems. If a network error causes a retry, the API returns the original order instead of creating a duplicate.

orders.list(limit=30, offset=0, status=None)

Lists orders with pagination.

orders, total = client.orders.list(limit=10, offset=0, status="FILLED")
print(f"{total} filled orders total")

for o in orders:
    cost_trx = (o.total_cost_sun or 0) / 1_000_000
    print(f"  {o.id}: {o.amount:,} {o.resource_type}, {cost_trx:.3f} TRX")

Returns tuple[list[Order], int] - the list of orders and the total count for pagination.

orders.get(order_id)

Returns a single order with its fill breakdown.

order = client.orders.get("ord_abc123")

print(f"Status: {order.status}")
print(f"Total cost: {(order.total_cost_sun or 0) / 1_000_000:.3f} TRX")

for fill in order.fills:
    print(f"  {fill.provider}: {fill.amount:,} at {fill.price_sun} SUN")
    print(f"  Verified: {fill.verified}")
    if fill.tronscan_url:
        print(f"  TX: {fill.tronscan_url}")

Returns OrderWithFills, which extends Order with a fills list of Fill objects.

Module 3: Balance

balance.get()

Returns current account balances.

bal = client.balance.get()
print(f"TRX: {bal.trx}")
print(f"USDT: {bal.usdt}")
print(f"Locked: {bal.trx_locked}")

Returns Balance. The trx_locked field shows TRX reserved for pending orders.

balance.deposit_info()

Returns the deposit address and memo for funding your account.

info = client.balance.deposit_info()
print(f"Send TRX to: {info.address}")
print(f"Memo: {info.memo}")
print(f"Minimum: {info.min_amount_trx} TRX / {info.min_amount_usdt} USDT")

Returns DepositInfo. Always include the memo in your deposit transaction for automatic crediting.

balance.withdraw(address, amount, currency="TRX", idempotency_key=None)

Withdraws funds to an external TRON address.

withdrawal = client.balance.withdraw(
    address="TExternalAddress",
    amount=100,
    currency="TRX",
    idempotency_key="withdraw-unique-id",
)
print(f"Withdrawal {withdrawal.id}: {withdrawal.status}")

Returns Withdrawal.

balance.history(period="30D") and balance.summary()

history = client.balance.history("7D")
print(f"{len(history)} transactions in last 7 days")

summary = client.balance.summary()
print(f"Total orders: {summary.total_orders}")
print(f"Total energy: {summary.total_energy:,}")
print(f"Average price: {summary.avg_price_sun} SUN")
print(f"Total spent: {summary.total_spent_sun / 1_000_000:.3f} TRX")

Module 4: Webhooks

webhooks.create(url, events)

Creates a webhook subscription.

webhook = client.webhooks.create(
    url="https://your-server.com/merx-webhook",
    events=["order.filled", "order.failed", "deposit.received"],
)
print(f"Webhook ID: {webhook.id}")
print(f"Secret: {webhook.secret}")  # Shown only once

Returns Webhook. The secret field is only included in the creation response and is used for HMAC-SHA256 signature verification.

Available event types: order.filled, order.failed, deposit.received, withdrawal.completed.

webhooks.list() and webhooks.delete(webhook_id)

webhooks = client.webhooks.list()
active = [w for w in webhooks if w.is_active]
print(f"{len(active)} active webhooks")

deleted = client.webhooks.delete("wh_abc123")
print(f"Deleted: {deleted}")  # True or False

Error Handling

All API errors raise MerxError with a code attribute and a human-readable message.

from merx import MerxClient, MerxError

client = MerxClient(api_key="sk_live_your_key_here")

try:
    order = client.orders.create(
        resource_type="ENERGY",
        amount=65000,
        target_address="TInvalidAddress",
        duration_sec=3600,
    )
except MerxError as e:
    print(f"Error [{e.code}]: {e}")
    # Output: Error [INVALID_ADDRESS]: Target address is not a valid TRON address

The MerxError class extends Exception, so it integrates naturally with Python exception handling. The code attribute provides machine-readable classification:

Code	Meaning
`UNAUTHORIZED`	Invalid or missing clave de API
`INSUFFICIENT_FUNDS`	Account balance too low
`INVALID_ADDRESS`	Not a valid TRON address
`ORDER_NOT_FOUND`	Order ID does not exist
`DUPLICATE_REQUEST`	Idempotency key already used
`RATE_LIMITED`	Too many requests, back off
`PROVIDER_UNAVAILABLE`	No providers can fulfill the request
`VALIDATION_ERROR`	Request body or parameters failed validation

Comparison with the JavaScript SDK

Both SDKs cover the same four modules with the same methods. The key differences are in language idioms:

Aspect	Python SDK	JavaScript SDK
HTTP client	`urllib.request` (stdlib)	Native `fetch`
Dependencies	Zero	Zero
Async support	No (synchronous only)	Yes (all methods return Promises)
Types	Dataclasses	TypeScript interfaces
Order creation	Keyword arguments	Object parameter
Orders list return	`tuple[list, int]`	`{ orders: [], total: number }`
Webhook delete	Returns `bool`	Returns `{ deleted: boolean }`
Min runtime	Python 3.10+	Node.js 18+
Module system	Standard imports	ESM only

The two SDKs are designed to feel natural in their respective languages while maintaining functional parity. A team using both Python and JavaScript can expect identical behavior from each.

Production Pattern: Price-Aware Order Placement

Aqui esta a complete production flow that checks current prices, validates the cost, and creates an order with idempotency:

import uuid
from merx import MerxClient, MerxError

client = MerxClient(api_key="sk_live_your_key_here")

def buy_energy(target: str, amount: int = 65000, max_cost_trx: float = 5.0):
    """Buy energy with cost validation and idempotency."""

    # Preview the cost first
    preview = client.prices.preview(
        resource="ENERGY",
        amount=amount,
        duration=3600,
    )

    if preview.no_providers:
        raise RuntimeError("No energy providers available")

    cost = float(preview.best.cost_trx)
    if cost > max_cost_trx:
        raise RuntimeError(
            f"Cost {cost:.3f} TRX exceeds limit {max_cost_trx:.3f} TRX"
        )

    # Place the order
    order = client.orders.create(
        resource_type="ENERGY",
        amount=amount,
        target_address=target,
        duration_sec=3600,
        idempotency_key=str(uuid.uuid4()),
    )

    print(f"Order {order.id} created at {preview.best.provider}")
    print(f"Expected cost: {cost:.3f} TRX")
    return order


try:
    order = buy_energy("TYourTargetAddress", amount=65000, max_cost_trx=3.0)
except MerxError as e:
    print(f"API error: [{e.code}] {e}")
except RuntimeError as e:
    print(f"Business logic error: {e}")

Installation Verification

After installing, verify the SDK is working:

from merx import MerxClient, __version__

print(f"merx-sdk version: {__version__}")

# Public endpoint, no auth required
client = MerxClient(api_key="test")
try:
    prices = client.prices.list()
    print(f"Providers online: {len(prices)}")
    for p in prices:
        if p.energy_prices:
            print(f"  {p.provider}: {p.energy_prices[0].price_sun} SUN")
except Exception as e:
    print(f"Connection error: {e}")

The prices.list() endpoint is public, so even a placeholder clave de API will work for testing connectivity.

Resources

Plataforma: merx.exchange
Documentacion: merx.exchange/docs
PyPI: pypi.org/project/merx-sdk
SDK de JavaScript: github.com/Hovsteder/merx-sdk-js | npm
Servidor MCP para agentes de IA: github.com/Hovsteder/merx-mcp | npm