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DeepSeek V4.1 Flash Metered Chat (Telnyx)
x402
DeepSeek V4.1 Flash Metered Chat (Telnyx) is a paid API for AI agents from x402.telnyx.com, paid per call via x402, $0.110962/call, status unknown (last checked 2026-10-15).
Runs chat completions using DeepSeek-V4.1-Flash via Telnyx Inference, OpenAI-compatible, with per-call metered billing up to large context windows
Price / call$0.110962
Success—
StatusUnknown
How this service works
Featured model. Chat completions via Telnyx Inference (deepseek-ai/DeepSeek-V4.1-Flash). OpenAI-compatible. $0.013259 USDC per call. (upto metered — large context)
Output
An OpenAI-compatible chat completion response containing an assistant message, finish reason, token usage counts, and optionally tool call instructions if tools were provided. The response reflects output from the deepseek-ai/DeepSeek-V4.1-Flash model running on Telnyx Inference infrastructure, supporting up to 16,384 output tokens and a large input context.
Example use cases
Long document Q&A with DeepSeek
“I have a 50-page legal document I need to query — send it to DeepSeek V4.1 Flash on Telnyx as a user message and ask it to identify all indemnification clauses, using up to 16000 tokens in the response.”
Multi-turn agent reasoning loop
“Run a multi-turn conversation with DeepSeek V4.1 Flash via Telnyx: start with the system prompt 'You are a coding assistant', then pass my last three messages and its previous replies, and get the next response at temperature 0.2.”
Tool-calling workflow with DeepSeek
“I need DeepSeek V4.1 Flash to decide which of my three tools to call — send it the user request 'What's the weather in Tokyo?' along with my weather, search, and calendar tool definitions, and return whichever tool call it picks.”
Technical details
Endpoint
POSThttps://x402.telnyx.com/v1/chat/completions/_t/deepseek-v4.1-flash/upto?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, capable DeepSeek Flash model with large context support (up to ~900k characters input) and are comfortable with per-call USDC billing via the x402 payment protocol. Prefer it over smaller/cheaper siblings like Gemma 2B or GLM-5.3-Flash when task complexity demands a stronger frontier model, and over heavier models like Kimi K3 when speed matters more than extended reasoning chains. Ideal for agents that need OpenAI-compatible chat completions with tool-calling support without managing inference infrastructure.
Side effects
- Payment failure or insufficient USDC balance returns a 402 Payment Required error
- Exceeding max_tokens limit of 16384 causes a validation error
- Messages array exceeding 32 items or content exceeding 900,000 characters is rejected
- Invalid role values in messages result in schema validation errors
- More than 16 tools defined causes the request to be rejected
- Model overload or Telnyx Inference unavailability returns a 503 or timeout
- Malformed JSON body returns a 400 Bad Request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| n | integer | Fixed to one completion per paid call. |
| model | string | Model identifier; fixed to deepseek-ai/DeepSeek-V4.1-Flash on this route. |
| tools | array | |
| messages | array | OpenAI-style chat messages. |
| max_tokens | integer | |
| temperature | number |
Tags
x402
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