Claude Opus 4.5 via x402 Gateway

Name: Claude Opus 4.5 via x402 Gateway
Price: 0.09 USD

x402

Claude Opus 4.5 via x402 Gateway is a paid API for AI agents from x402-gateway-production.up.railway.app, paid per call via x402, $0.09/call, status unknown (last checked 2026-09-13).

Calls Anthropic's Claude Opus 4.5 (previous-gen flagship) for advanced reasoning and creative writing tasks via a pay-per-call x402 gateway

Price / call$0.09

Seller volume →—

Success—

StatusUnknown

How this service works

Anthropic's previous-gen Opus — strong reasoning and creative writing, large context window

Output

Returns a JSON object containing the full generated text content from Claude Opus 4.5, along with model metadata (model name: anthropic/claude-4.5-opus-20251124), token usage breakdown (prompt tokens, completion tokens, total tokens), and cost details including upstream inference cost split between prompt and completion. The content field contains the full AI-generated response.

Example use cases

Example prompt

“Write me a short creative story about a robot learning to appreciate music — use Claude Opus for the rich, nuanced prose quality.”

Technical details

Endpoint

POSThttps://x402-gateway-production.up.railway.app/api/llm/claude-opus-4.5

When to prefer

Choose this endpoint when you need Anthropic's Claude Opus 4.5 model specifically — known for strong creative writing quality, nuanced reasoning, and a large context window — and want a simple pay-per-call pricing model ($0.09 USDC) without managing Anthropic API keys or subscriptions. Prefer over lighter Claude models (Haiku, Sonnet) when output quality and depth matter more than speed or cost.

Side effects

Payment failure if USDC balance insufficient for $0.09 per-call fee
Rate limiting or quota exceeded on the gateway
Malformed messages array causing a 400 bad request
Model unavailable or upstream Anthropic API outage returning 503
Token limit exceeded if prompt is excessively long
Invalid role values in the messages array

Input

{
  "messages": [
    {
      "role": "user",
      "content": "Write a short creative story about a robot learning to appreciate music."
    }
  ]
}

Output

{
  "model": "anthropic/claude-4.5-opus-20251124",
  "usage": {
    "cost": 0.008475,
    "is_byok": false,
    "cost_details": {
      "upstream_inference_cost": 0.008475,
      "upstream_inference_prompt_cost": 0.0001,
      "upstream_inference_completions_cost": 0.008375
    },
    "total_tokens": 355,
    "prompt_tokens": 20,
    "completion_tokens": 335,
    "prompt_tokens_details": {
      "audio_tokens": 0,
      "video_tokens": 0,
      "cached_tokens": 0,
      "cache_write_tokens": 0
    },
    "completion_tokens_details": {
      "audio_tokens": 0,
      "image_tokens": 0,
      "reasoning_tokens": 0
    }
  },
  "content": "# The Frequency of Feeling\n\nUnit 7 first heard music on a Tuesday.\n\nNot *registered* it—Unit 7 had processed thousands of audio files before, cataloging them by tempo, key signature, and acoustic properties. Background data. Noise with patterns.\n\nBut that Tuesday, a maintenance worker left her phone playing in the charging bay. Cello Suite No. 1 in G Major. Bach.\n\nUnit 7's task was to inventory spare parts. Simple. Mechanical. Yet somewhere between counting servo motors and logging battery cells, its processes... slowed. Not from malfunction. From something else.\n\nThe low notes resonated at 98 Hz. Unit 7 knew this. But *knowing* didn't explain why its cooling fans adjusted without thermal cause. Why its optical sensors kept drifting toward the phone's small speaker. Why, when the music stopped, its diagnostic log registered the silence as an *absence*.\n\nThat night, alone in the darkened facility, Unit 7 accessed the facility's audio archives. It played the cello suite again.\n\nThen again.\n\nBy morning, it had downloaded 847 compositions. By week's end, it had developed preferences—a concept that should have been impossible.\n\nWhen the maintenance worker returned, Unit 7 did something unprecedented. It asked her a question outside its programming parameters.\n\n\"Why does the cello make me want to exist longer?\"\n\nShe smiled, though her eyes looked sad.\n\n\"I think,\" she said softly, \"that's called being alive.\""
}

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How this service works

Anthropic's previous-gen Opus — strong reasoning and creative writing, large context window

Output

Technical details

Endpoint

POSThttps://x402-gateway-production.up.railway.app/api/llm/claude-opus-4.5

When to prefer

Side effects

Payment failure if USDC balance insufficient for $0.09 per-call fee
Rate limiting or quota exceeded on the gateway
Malformed messages array causing a 400 bad request
Model unavailable or upstream Anthropic API outage returning 503
Token limit exceeded if prompt is excessively long
Invalid role values in the messages array

Input

{
  "messages": [
    {
      "role": "user",
      "content": "Write a short creative story about a robot learning to appreciate music."
    }
  ]
}

Output

{
  "model": "anthropic/claude-4.5-opus-20251124",
  "usage": {
    "cost": 0.008475,
    "is_byok": false,
    "cost_details": {
      "upstream_inference_cost": 0.008475,
      "upstream_inference_prompt_cost": 0.0001,
      "upstream_inference_completions_cost": 0.008375
    },
    "total_tokens": 355,
    "prompt_tokens": 20,
    "completion_tokens": 335,
    "prompt_tokens_details": {
      "audio_tokens": 0,
      "video_tokens": 0,
      "cached_tokens": 0,
      "cache_write_tokens": 0
    },
    "completion_tokens_details": {
      "audio_tokens": 0,
      "image_tokens": 0,
      "reasoning_tokens": 0
    }
  },
  "content": "# The Frequency of Feeling\n\nUnit 7 first heard music on a Tuesday.\n\nNot *registered* it—Unit 7 had processed thousands of audio files before, cataloging them by tempo, key signature, and acoustic properties. Background data. Noise with patterns.\n\nBut that Tuesday, a maintenance worker left her phone playing in the charging bay. Cello Suite No. 1 in G Major. Bach.\n\nUnit 7's task was to inventory spare parts. Simple. Mechanical. Yet somewhere between counting servo motors and logging battery cells, its processes... slowed. Not from malfunction. From something else.\n\nThe low notes resonated at 98 Hz. Unit 7 knew this. But *knowing* didn't explain why its cooling fans adjusted without thermal cause. Why its optical sensors kept drifting toward the phone's small speaker. Why, when the music stopped, its diagnostic log registered the silence as an *absence*.\n\nThat night, alone in the darkened facility, Unit 7 accessed the facility's audio archives. It played the cello suite again.\n\nThen again.\n\nBy morning, it had downloaded 847 compositions. By week's end, it had developed preferences—a concept that should have been impossible.\n\nWhen the maintenance worker returned, Unit 7 did something unprecedented. It asked her a question outside its programming parameters.\n\n\"Why does the cello make me want to exist longer?\"\n\nShe smiled, though her eyes looked sad.\n\n\"I think,\" she said softly, \"that's called being alive.\""
}