weeasycrypto (Python)

Official Python SDK for the WeEasyCrypto tenant API: deposit addresses, balances, deposits, withdrawals, and signed webhooks.

• One runtime dependency. HTTP via urllib; Ed25519 (request signing and webhook verification) via the audited cryptography package (the stdlib has none). A custom transport is injectable for proxies, test stubs, or record/replay.
• Signing you never hand-write. Every request carries an Ed25519 signature (X-Timestamp + X-Signature) computed over the exact bytes sent on the wire — the platform holds only your public key and can verify, never forge. Webhook deliveries are Ed25519-signed too (v1a, per-tenant platform key) — verified with your tenant's public key, ±300 s tolerance.
• Amounts are decimal strings, never floats. parse_amount / format_amount use pure integer arithmetic.

⚠️ Server-side only. Your Ed25519 private_key must never reach a browser or mobile bundle — it was generated locally when the key was issued and the platform cannot recover it.

Install

pip install weeasycrypto

Quickstart

import os
from weeasycrypto import WeEasyCrypto

cv = WeEasyCrypto(
    base_url="https://api.example.com",
    api_key=os.environ["WEEASYCRYPTO_API_KEY"],          # keyId, e.g. "ck_…"
    private_key=os.environ["WEEASYCRYPTO_PRIVATE_KEY"],  # hex Ed25519 seed, generated at issuance
    webhook_public_key=os.environ.get("WEEASYCRYPTO_WEBHOOK_PUBLIC_KEY"),  # portal → Settings → Integrations
)

# Issue a deposit address
addr = cv.addresses.create(label="user-42", chain_key="tron")
addr.family  # 'EVM' | 'TRON' | 'BTC' | 'SOL' | 'TON'

# Balances — amounts are decimal strings, never floats
balances = cv.balances.list()

# Deposits with auto-pagination
for d in cv.deposits.iterate(status="CONFIRMED"):
    print(d.tx_hash, d.amount)

Withdrawals — the idempotency contract

request_id is your idempotency key. Persist it in your own database before calling; the SDK deliberately never generates one, because a regenerated key after a crash is how double-payouts happen.

from weeasycrypto import ConflictError

try:
    w = cv.withdrawals.create(
        request_id="wd-20260710-0001",  # yours, persisted first
        chain_key="eth-mainnet",
        token_symbol="USDT",
        to="0x…",
        amount="100.5",  # always a string
    )
except ConflictError as err:
    if err.is_duplicate_request:
        # Safety signal, not a failure: an earlier attempt already created it.
        # Look the withdrawal up via the id you stored against this request_id.
        ...
    else:
        raise

# Poll to a terminal status (webhooks are the push-based alternative)
final = cv.withdrawals.wait_until_final(w.id)
# final.status: 'CONFIRMED' | 'FAILED' | 'REJECTED' | 'CANCELED'
if final.status == "CONFIRMED":
    print(final.tx_hash)

Network errors on withdrawals.create / create_batch are retried automatically with the same request_id — that can never double-spend. addresses.create has no idempotency key, so it is never auto-retried; list() recent addresses before creating again if the outcome was unknown.

Webhooks

Deliveries carry X-Webhook-Signature: t={ts},v1a={hex} — an Ed25519 signature over {ts}.{body} made with a per-tenant platform key. Verification needs only your tenant's public key (webhookSignPublicKey in the merchant portal, Settings → Integrations); there is no shared secret to protect.

# Flask example — raw body must be the exact bytes received.
from weeasycrypto import WebhookVerificationError

@app.post("/webhook")
def webhook():
    try:
        event = cv.webhooks.parse(
            request.get_data(), request.headers.get("X-Webhook-Signature")
        )
    except WebhookVerificationError:
        return "", 400

    if event.type == "deposit.confirmed":
        credit(event.data["depositId"], event.data["amount"])
    elif event.type == "withdrawal.completed":
        mark_paid(event.data["requestId"])
    # New event types appear over time — ignore what you don't know.
    return "", 200

Errors

WeEasyCryptoError
├─ APIError (status / code / request_id)
│   ├─ AuthenticationError(401)   ├─ PermissionDeniedError(403)
│   ├─ NotFoundError(404)         ├─ ConflictError(409)   # .is_duplicate_request
│   ├─ ValidationError(422)       └─ ServerError(5xx)
│   └─ RateLimitError(429)        # .retry_after_ms
├─ NetworkError                    # no HTTP response; safe to replay withdrawals
├─ WebhookVerificationError
└─ TimeoutError                    # wait_until_final budget exceeded

Testing

python3 -m venv .venv && .venv/bin/pip install -e . pytest
.venv/bin/pytest

Signing is verified against the shared golden vectors in ../vectors/signing-vectors.json.