What was verified
deepseek-v4-flash-0731 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.
Model Validation and Capabilities
The deepseek-v4-flash-0731 model is listed in the TokenBison public model catalog and has been verified to return text from a real, non-streaming chat request [0]. This validation does not establish support for tool calling, vision, or streaming, nor does it guarantee specific rate limits or imply provider endorsement [0]. Evidence basis: What was verified
Implementation and Security Workflow
To connect your application, create a TokenBison account, add balance, and generate an API key [1]. Store this key securely in the OPENAI_API_KEY environment variable, ensuring it is never embedded in browser code or committed to source control [1]. When estimating costs, note that token-based estimates use standard uncached input and output tokens for the public default group, excluding cache, image, audio, tiered, per-request, and account-specific pricing [2]. Always confirm current model pricing and your account group before executing a workload, as actual calls may incur charges [1, 2]. Evidence basis: Connect your application; Understand the estimate
Troubleshooting Unsuccessful Requests
If a request fails with a 401 error, verify the API key and the Authorization header [3]. For model-access errors, confirm the exact model ID and ensure the key has the correct allowed models or group permissions [3]. If there is an insufficient balance, inspect the account wallet [3]. For 429 rate limit errors or temporary upstream errors, implement bounded exponential backoff and avoid retrying indefinitely [3]. Evidence basis: Troubleshoot an unsuccessful request
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-flash-0731","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-flash-0731","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'])