# SingIt Ask – OpenAI Responses API

> SingIt Ask – OpenAI Responses 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).

Calls OpenAI's Responses API format (supporting GPT, Claude, Gemini, DeepSeek and more) with per-answer metered payment via x402, no API key required

## Facts

- Endpoint: POST https://ask.singitai.app/v1/responses?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/singit-ask-openai-responses-api-59ec209f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NcIo8khV5JTGxy0uwGTvz

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability singit-ask-openai-responses-api-59ec209f -d '<json body>'
```

Example prompt: Using the OpenAI Responses API format on SingIt, send this prompt to gpt-4o: 'Summarize the key differences between transformer and mamba architectures in three bullet points' — charge the token cost to my USDC wallet, no account needed.

## When to prefer this

Prefer this endpoint when you need to call LLMs via the OpenAI Responses API format without managing API keys or subscriptions, especially in agent pipelines that want pay-per-successful-answer semantics with USDC micropayments. It is ideal when you want to access GPT, Claude, Gemini, or DeepSeek through a single unified interface with crypto-native billing. Choose it over direct provider APIs when you want no upfront account setup, only-on-success charging, and support for multiple model families from one endpoint.

## Known failure modes

- Insufficient USDC balance — payment rejected before inference runs
- Invalid or unsupported model name — model not found in /v1/models list
- Malformed request body — missing required 'input' field or wrong bodyType enum
- Model provider outage — upstream LLM unavailable, no charge applied
- Request too large — exceeds ceiling for the selected model
- Network timeout — inference takes too long, no answer returned so no charge

## How this service works

SingIt Ask: OpenAI's Responses API, any model listed at GET /v1/models (GPT, Claude, Gemini, DeepSeek and more). Call it when an agent needs an answer in OpenAI's Responses format with no API key or account.

## Output

Returns the model's completion in OpenAI Responses API format, including the generated text content and token usage metadata. Charges are applied only when a valid answer is returned: actual token cost plus 30% markup plus a settlement fee (0.001 USDC on Base, 0.002 on Solana), up to a model/size-specific ceiling.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "oneOf": [
    {
     "type": "string",
     "minLength": 1
    },
    {
     "type": "array",
     "minItems": 1
    }
   ],
   "description": "The question: text, or a non-empty list of input items (OpenAI Responses format)."
  },
  "model": {
   "type": "string",
   "examples": [
    "claude-sonnet-5.5",
    "gpt-5.5",
    "gemini-3.1-pro"
   ],
   "maxLength": 120,
   "description": "Any model id from GET /v1/models; Anthropic's dashed names (claude-sonnet-5-5) work too."
  },
  "tools": {
   "type": "array",
   "description": "Optional tool definitions."
  },
  "stream": {
   "enum": [
    false
   ],
   "type": "boolean",
   "description": "Streaming is not offered: an answer is paid for whole."
  },
  "instructions": {
   "type": "string",
   "description": "Optional system instructions."
  },
  "max_output_tokens": {
   "type": "integer",
   "default": 4096,
   "maximum": 32000,
   "minimum": 1,
   "description": "The longest answer, in tokens. The payment ceiling grows with it; the charge follows what was used."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/singit-ask-openai-responses-api-59ec209f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ask.singitai.app](https://www.zero.xyz/host/ask.singitai.app/llms.txt)