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solvex-sdk

Python client for the Solvex FunCaptcha solving API.

Install

pip install solvex-sdk
# or, from this repo:
pip install .

The distribution is published as solvex-sdk; the import name is solvex.

Requires Python 3.10+. Depends on httpx.

Quickstart

from solvex import SolvexClient, FunCaptchaTask, Proxy

with SolvexClient("sk_live_...") as sx:
    result = sx.solve(FunCaptchaTask(
        website_url="https://roblox.com",
        website_public_key="476068BF-9607-4799-B53D-966BE98E2B81",
        proxy=Proxy.from_url("http://user:pass@184.82.39.210:8080"),
    ))
    print(result.token)
    print(f"cost=${result.cost_usd}  solved in {result.solve_seconds}s")

A proxy is required — Solvex does not run proxyless solves.

Supported site keys

Solvex rejects websitePublicKey values it doesn't know, rather than silently forwarding bad context (wrong surl, wrong location.href, wrong referrer) that Arkose would quietly suppress a token for. The currently-registered keys:

Label	websitePublicKey
Roblox Login	476068BF-9607-4799-B53D-966BE98E2B81
Roblox Signup	A2A14B1D-1AF3-C791-9BBC-EE33CC7A0A6F

Passing anything else raises UnsupportedSiteKeyError (errorId: 23) — contact support to add the site you need.

Logged-in sessions (blob + cookies)

When the challenge is tied to a logged-in Roblox session (e.g. authenticated actions that hand you a dataExchangeBlob), pass the blob in data and the matching session cookie string in cookies. Without the cookie Arkose will treat the session as mismatched and suppress the token:

result = sx.solve(FunCaptchaTask(
    website_url="https://www.roblox.com",
    website_public_key="476068BF-9607-4799-B53D-966BE98E2B81",
    proxy=Proxy.from_url("http://user:pass@1.2.3.4:8080"),
    data=roblox_data_exchange_blob,
    cookies=".ROBLOSECURITY=...; RBXEventTrackerV2=...;",
))

Cookie formats

The API accepts cookies in any of the shapes you'd get from common clients — they're normalized to a Cookie: header server-side:

# Raw header string (default)
cookies=".ROBLOSECURITY=...; RBXEventTrackerV2=..."

# Python requests
cookies=session.cookies.get_dict()

# rnet — same dict shape
cookies=dict(client.cookies)

# Playwright / Selenium / Puppeteer
cookies=[{"name": ".ROBLOSECURITY", "value": "..."}, {"name": "RBXEventTrackerV2", "value": "..."}]

# List of pair strings
cookies=[".ROBLOSECURITY=...", "RBXEventTrackerV2=..."]

PoW-flagged sessions

When Arkose returns pow=true, the server can solve the PoW challenge and still hand you a token instead of failing. Opt in with solve_pow=True — it trades 1–3s (C++ fast path) or 15–30s (Node fallback) of latency for a higher success rate on flagged sessions. Billed as a normal solve.

task = FunCaptchaTask(..., solve_pow=True)

Async

import asyncio
from solvex import AsyncSolvexClient, FunCaptchaTask, Proxy

async def main():
    async with AsyncSolvexClient("sk_live_...") as sx:
        result = await sx.solve(FunCaptchaTask(
            website_url="https://roblox.com",
            website_public_key="476068BF-9607-4799-B53D-966BE98E2B81",
            proxy=Proxy.from_url("socks5://184.82.39.210:1080"),
            use_http3=True,   # None = server default (enabled)
        ))
        print(result.token)

asyncio.run(main())

Low-level

If you want to manage polling yourself:

task_id = sx.create_task(task)
while True:
    r = sx.get_task_result(task_id)
    if r["status"] == "ready":
        print(r["solution"]["token"])
        break

Balance

print(f"${sx.get_balance():.4f} remaining")

Errors

Every non-zero errorId raises a typed exception:

Exception	errorId	Meaning
InvalidKeyError	1	clientKey missing / bad / revoked
UnsupportedTaskError	2, 22	task type not enabled
UnsupportedSiteKeyError	23	websitePublicKey not registered — contact support
InsufficientCreditsError	10	account balance too low
TaskFailedError	12	solver couldn't produce a token (credits refunded)
TaskNotFoundError	16	unknown taskId
RateLimitedError	31	per-key or per-user rate limit
TaskTimeoutError	40	task exceeded server timeout / client wait

Catch SolvexError to catch everything.

from solvex import SolvexClient, TaskFailedError, RateLimitedError

try:
    result = sx.solve(task, timeout=90)
except TaskFailedError:
    # server already refunded — retry with fresh proxy
    ...
except RateLimitedError:
    time.sleep(5)

Idempotency

Pass idempotency_key= to guard against double-billing on retries. Replays within 24h return the same taskId without a second charge.

sx.solve(task, idempotency_key=f"user-42-{run_id}")

HTTP/3

Set use_http3=False on the task to force HTTP/2 (useful when debugging proxies that mangle h3). Default is server-side (h3 enabled).

Browser profile

Set browser= to route the solve through a specific fingerprints_v2 profile. Accepts a family alias ("firefox", "chrome", "brave", "edge", "safari") or a specific profile name ("firefox_win_140", "chrome_win_141", etc.). Omit or pass "auto" for the legacy Safari path.

task = FunCaptchaTask(..., browser="firefox")

License

MIT.