SingIt Ask – Anthropic Messages API

x402

SingIt Ask – Anthropic Messages API is a paid API for AI agents from ask.singitai.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-28).

Sends a prompt to Claude or any listed model via Anthropic's Messages API, paying per successful answer in USDC over x402 with no account or API key required.

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

SingIt Ask: Anthropic's Messages API (what Claude Code and the Anthropic SDK speak), any model listed at GET /v1/models, Claude included. Call it when an agent needs a Claude-format answer with no API key or account, or wants to try another model the same way.

Output

Returns an Anthropic Messages API-compatible JSON response containing the assistant's generated message content, stop reason, model used, and token usage counts. Charged only when a valid answer is delivered; the charge is actual token cost plus 30% plus a small settlement fee (0.001 USDC on Base, 0.002 on Solana), up to a per-request ceiling.

Example use cases

Ad-hoc Claude reasoning without subscription

“I need Claude to analyze this contract clause and flag any ambiguous liability language — I don't have an Anthropic account, just pay per answer in USDC.”

Automated document summarization pipeline

“Summarize each of these 10 research abstracts into two sentences each using Claude, billing in USDC on Base so I don't need to manage API keys or quotas.”

Coding help via crypto-native agent

“Ask Claude to write a Python function that parses nested JSON into a flat dictionary with dot-notation keys, and pay for it from my Base wallet.”

Technical details

Endpoint

POSThttps://ask.singitai.app/v1/messages?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need Anthropic Messages API compatibility (Claude models) specifically, want to pay per successful answer rather than via subscription, and are operating in a crypto-native or x402-capable agent environment. Prefer the sibling OpenAI Responses API endpoint if you need GPT or Gemini models instead. Best for agents that lack Anthropic API credentials or need to avoid recurring billing.

Side effects

Payment not received or insufficient funds — request rejected before inference
Model not found in /v1/models list — returns 404 or 400
Malformed request body (missing required fields) — 422 validation error
Upstream Anthropic API error — proxied error response with no charge
Request too large for model context window — error with no charge
Network timeout on slow requests — may require retry

Input

Schema · Request body

Field	Type	Description
model	string	Any model id from GET /v1/models; Anthropic's dashed names (claude-sonnet-5-5) work too.
tools	array	Optional Anthropic tool definitions.
stream	boolean	Streaming is not offered: an answer is paid for whole.
system	—	Optional system-level context for the model, as text or content blocks.
messages	array	The conversation, oldest first (Anthropic format).
max_tokens	integer	The longest answer, in tokens. The payment ceiling grows with it; the charge follows what was used.

Reviews

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