DeepSeek Fill-in-the-Middle (FIM) via Locus x402

x402

DeepSeek Fill-in-the-Middle (FIM) via Locus x402 is a paid API for AI agents from deepseek.x402.paywithlocus.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Completes code between a given prefix and suffix using DeepSeek's fill-in-the-middle capability, paid per-call via x402 micropayment protocol.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Frontier AI models — DeepSeek-V3 for fast chat and code, DeepSeek-R1 for deep chain-of-thought reasoning. OpenAI-compatible API format. Among the most capable and cost-efficient models available.

Output

Returns a JSON object containing the completed code (in the data field), payment details showing settled and authorized USDC amounts, a unique request ID, and a status URL for tracking the request. The filled-in code appears between the supplied prompt prefix and suffix.

Example use cases

Autocomplete function body from signature

“I have a Python function that starts with 'def parse_config(filepath):' and ends with 'return config_dict' — use DeepSeek FIM to fill in the implementation, up to 200 tokens.”

Fill missing SQL query logic

“I've got the beginning of a SQL query 'SELECT user_id, SUM(amount) FROM orders WHERE' and the end 'GROUP BY user_id HAVING SUM(amount) > 1000' — can you use DeepSeek to fill in what goes in between, max 128 tokens?”

Complete React component JSX block

“My React component starts with 'const Card = ({ title, body }) => { return (' and closes with ');};' — use DeepSeek FIM to generate the JSX markup in between, up to 300 tokens at default temperature.”

Technical details

Endpoint

POSThttps://deepseek.x402.paywithlocus.com/deepseek/fim

When to prefer

Choose this endpoint when you need fill-in-the-middle (FIM) code completion — inserting code between a known prefix and suffix — using DeepSeek's frontier model, paid per-call with no subscription via the x402 micropayment protocol. Prefer it over chat-style code generation when you have both surrounding context (prefix and suffix) and need precise code infill rather than open-ended generation. It's ideal for agentic coding workflows, editor-like autocomplete, and pay-as-you-go usage patterns.

Side effects

Missing or invalid model name (must be 'deepseek-v4-pro') causes request rejection
max_tokens not provided or exceeds 384000 limit causes authorization failure
Insufficient USDC balance or payment failure via x402 protocol blocks execution
Empty or malformed prompt/suffix fields may result in poor or no completion
Rate limiting or upstream DeepSeek API unavailability causes 5xx errors

Input

Schema · Request body

Field	Type	Description
model	string
prompt	string
suffix	string
max_tokens	number
temperature	number

Output

Schema · Response

{
  "type": "json",
  "example": {
    "data": {},
    "payment": {
      "scheme": "exact",
      "settledUsdc": "0.001000",
      "authorizedMaxUsdc": "0.001000"
    },
    "request": {
      "id": "00000000-0000-4000-8000-000000000000",
      "statusUrl": "/requests/00000000-0000-4000-8000-000000000000"
    },
    "success": true
  }
}

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How this service works

Frontier AI models — DeepSeek-V3 for fast chat and code, DeepSeek-R1 for deep chain-of-thought reasoning. OpenAI-compatible API format. Among the most capable and cost-efficient models available.

Output

Example use cases

Autocomplete function body from signature

“I have a Python function that starts with 'def parse_config(filepath):' and ends with 'return config_dict' — use DeepSeek FIM to fill in the implementation, up to 200 tokens.”

Fill missing SQL query logic

Complete React component JSX block

Technical details

Endpoint

POSThttps://deepseek.x402.paywithlocus.com/deepseek/fim

When to prefer

Side effects

Missing or invalid model name (must be 'deepseek-v4-pro') causes request rejection
max_tokens not provided or exceeds 384000 limit causes authorization failure
Insufficient USDC balance or payment failure via x402 protocol blocks execution
Empty or malformed prompt/suffix fields may result in poor or no completion
Rate limiting or upstream DeepSeek API unavailability causes 5xx errors

Input

Schema · Request body

Field	Type	Description
model	string
prompt	string
suffix	string
max_tokens	number
temperature	number

Output

Schema · Response

{
  "type": "json",
  "example": {
    "data": {},
    "payment": {
      "scheme": "exact",
      "settledUsdc": "0.001000",
      "authorizedMaxUsdc": "0.001000"
    },
    "request": {
      "id": "00000000-0000-4000-8000-000000000000",
      "statusUrl": "/requests/00000000-0000-4000-8000-000000000000"
    },
    "success": true
  }
}