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SingIt Ask: Claude Sonnet 5.5
x402
SingIt Ask: Claude Sonnet 5.5 is a paid API for AI agents from ask.singitai.app, paid per call via x402, $0.007773/call, status unknown (last checked 2026-10-30).
Provides OpenAI-compatible chat completions using Anthropic's Claude Sonnet 5.5 model, paid per call in USDC with no API key required.
Price / call$0.007773
Success—
StatusUnknown
How this service works
SingIt Ask: Claude Sonnet 5.5 (Anthropic) chat completions with no API key or account, OpenAI-compatible. Anthropic's mid-sized Claude model: everyday coding, writing and analysis at a lower cost than Opus. Call it when an agent needs Claude Sonnet 5.5 specifically.
Output
A JSON chat completion response in OpenAI-compatible format containing the assistant's text reply generated by Claude Sonnet 5.5, with token usage metadata. Streaming is not supported; the full response is returned at once.
Example use cases
Automated code review assistant
“Use Claude Sonnet 5.5 to review this JavaScript async function and explain any issues it might have — please keep the response under 900 tokens.”
Draft professional email reply
“Have Claude Sonnet 5.5 write a polite but firm reply to this vendor email declining their offer, keeping the tone professional and the response under 600 tokens.”
Summarize and analyze a document
“Ask Claude Sonnet 5.5 to summarize the key points of this meeting transcript and identify any action items, in under 1000 tokens.”
Technical details
Endpoint
POSThttps://ask.singitai.app/v1/chat/claude-sonnet-5.5?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need Anthropic's Claude Sonnet 5.5 model (mid-tier capability, lower cost than Opus) and want to avoid setting up an Anthropic API account. Ideal for agents that need pay-per-call USDC billing via x402 with OpenAI-compatible request format. Prefer over Claude Haiku when higher reasoning quality is needed, and over Claude Opus when cost is a concern.
Side effects
- Payment failure if USDC balance is insufficient for the x402 transaction
- Input exceeds 24000 character limit across all messages, resulting in rejection
- max_tokens set above 1200 causes validation error
- Empty or malformed messages array returns an error
- Model ID provided does not match a supported model on the platform
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Any model id from GET /v1/models; the ceiling follows its price. Omit for the default model. |
| stream | boolean | Streaming is not offered. |
| messages | array | The conversation, oldest first. |
| max_tokens | integer | The longest answer, in tokens. The payment ceiling grows with it; the charge follows what was used. |
Tags
x402
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