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x402engine Claude Haiku LLM API
x402
x402engine Claude Haiku LLM API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).
Runs Anthropic's Claude Haiku model via a pay-per-call HTTP 402 micropayment endpoint for fast, affordable text generation
Price / call$0.02
Success—
StatusUnknown
How this service works
Anthropic's fastest model — affordable and quick for simple tasks and high throughput
Output
Returns Claude Haiku's generated text completion based on the provided message array. The response contains the model's reply to the conversation, up to the specified max_tokens limit (default 1024). Typical latency is low, suitable for real-time or near-real-time agent use.
Example use cases
Affordable agent reasoning step
“Use Claude Haiku to classify this incoming support message as 'billing', 'technical', or 'general' and return just the category label — the message is: 'I was charged twice for my subscription this month.'”
High-throughput content summarization
“I have 50 product descriptions I need condensed to one sentence each for a catalog — run them through Claude Haiku one at a time and keep max tokens at 60 per response.”
Lightweight chatbot backend
“Power my FAQ chatbot with Claude Haiku — send it the user message 'How do I reset my password?' and a system-style instruction to answer concisely as a helpful assistant, max 150 tokens.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/claude-haiku?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, affordable Claude Haiku inference on a per-call basis without committing to an Anthropic subscription or managing API keys. It is ideal for AI agents that need to pay programmatically via USDC micropayments, high-throughput pipelines requiring many cheap LLM calls, or prototypes needing Claude's quality at low cost. Prefer it over GPT-based endpoints when Anthropic's Claude output style or safety characteristics are specifically desired.
Side effects
- Payment not included or insufficient USDC — returns HTTP 402 with payment requirement
- Missing required 'messages' field — returns 400 validation error
- Empty messages array (minItems: 1 violated) — returns 400
- Invalid role values in message objects — returns 400
- max_tokens set too high — may be capped or return error
- Anthropic API upstream downtime — returns 5xx error
- Malformed JSON body — returns 400 parse error
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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