What was verified
deepseek-v4-pro appeared in TokenBison's public model catalog and returned text from a real, non-streaming chat request. This check does not establish tool calling, vision, streaming support, rate guarantees or provider endorsement.
Connect your application
Create a TokenBison account, add balance if needed, then create an API key. Store it in the OPENAI_API_KEY environment variable. Never embed a key in browser code or commit it to source control. The examples below send a small request; actual calls may incur charges.
Understand the estimate
Token-based estimates use standard uncached input and output tokens for the public default group. Cache, image, audio, tiered, per-request and account-specific pricing are excluded. Always confirm the current model pricing and your account group before running a workload.
Troubleshoot an unsuccessful request
For 401, check the key and Authorization header. For a model-access error, check the exact model ID and the key's allowed models/group. For insufficient balance, inspect the wallet. For 429 or temporary upstream errors, use bounded exponential backoff and avoid retrying indefinitely.
Suggested Validation for Python Exception Handling
First, initiate the request using urllib.request.urlopen, ensuring you assign a timeout value for blocking operations and define the appropriate Content-Type for requests containing data. As a suggested validation step, wrap the call in a handler that checks for HTTPError before the broader URLError. If HTTPError occurs, examine the code and headers attributes to isolate the HTTP failure reason. If only URLError occurs, review the reason attribute, which may contain text or nested exceptions. Apply your chosen retry or cancellation strategy based on this classification, recognizing that these client-library checks outline a suggested debugging workflow and do not measure model capability or network reliability. Evidence basis: Python: request and response handling; Python: HTTP errors and connection errors
Suggested Checkpoint Separating Transfer Completion from Model Output
Begin by executing your request and observing when the network transfer finishes. Following transfer completion, implement a suggested checkpoint to immediately inspect the HTTP response status code using your client's status reporting features. If the status code indicates a failure, halt further processing and apply your error-handling routine. If the status code reflects success, proceed to parse the response body and validate the application-level model output. This suggested workflow clarifies that a completed transfer or successful HTTP status alone does not guarantee successful model execution. Evidence basis: curl: transfer success and HTTP response status; Connect your application
Suggested Workflow for Cost Estimation and Access Verification
Start by generating a baseline cost estimate using only standard uncached input and output tokens designated for the public default group. As a suggested conditional step, cross-reference this estimate with your active account group and exclude cache, image, audio, tiered, per-request, and account-specific pricing modifiers from the calculation. Next, inspect your account wallet balance. If the balance proves insufficient, pause execution and recharge the account before proceeding. Once validated, verify that your API key is stored in the OPENAI_API_KEY environment variable and never embedded in browser code or source control, then submit the request while acknowledging that actual charges may vary from the preliminary estimate. Evidence basis: Understand the estimate; Connect your application
Technical references
Reviewed client-documentation snapshots, not documentation fetched again today. These do not establish model capabilities, latency or availability guarantees.
Python: request and response handling · 2026-09-16
Python urllib.request.urlopen accepts a timeout in seconds for blocking operations such as connecting; this is not a deadline for an entire application workflow. Describing it as solely a connection or initial-handshake timeout is incorrect: connecting is an example, not the entire scope. Its response exposes status, headers and URL and supports use as a context manager. Requests carrying data should specify the appropriate Content-Type. These are client-library facts, not evidence of a particular model's capabilities or latency.
Python: HTTP errors and connection errors · 2026-09-16
Python HTTPError is a subclass of URLError. HTTPError exposes the HTTP status through code, response headers through headers, and a readable error body. URLError.reason may be text or another exception. Consequently, a handler that needs to distinguish HTTP errors must check the more specific HTTPError before the broader URLError. These client exception types do not establish the cause of a TokenBison outage.
curl: transfer success and HTTP response status · 2026-09-16
By default curl can finish a transfer successfully even when the HTTP status indicates a failed request. Its --write-out option can report the HTTP response code; --fail enables HTTP-error failure handling. A successful transfer alone therefore does not establish successful model execution. Response codes and returned application data are separate checks.
A minimal text request
curl
curl https://tokenbison.com/v1/chat/completions \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
--data '{"max_tokens":256,"messages":[{"content":"Reply with the word OK.","role":"user"}],"model":"deepseek-v4-pro","stream":false}'Python
import json, os, urllib.request
payload = json.loads('{"max_tokens":256,"messages":[{"content":"Reply with the word OK.","role":"user"}],"model":"deepseek-v4-pro","stream":false}')
request = urllib.request.Request(
'https://tokenbison.com/v1/chat/completions',
data=json.dumps(payload).encode(),
headers={'Authorization': 'Bearer ' + os.environ['OPENAI_API_KEY'],
'Content-Type': 'application/json'},
)
with urllib.request.urlopen(request, timeout=60) as response:
print(json.load(response)['choices'][0]['message']['content'])