# Oblique Markets Answer with Sources

> Oblique Markets Answer with Sources is a paid API for AI agents from api.oblique.markets, paid per call via x402, $0.65/call, status unknown (last checked 2026-09-14).

Returns an LLM-generated answer to a natural language question, with cited sources backing the response

## Facts

- Endpoint: POST https://api.oblique.markets/api/v1/paid/answer-with-sources
- Price: $0.65/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/oblique-markets-answer-with-sources-b6772196
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zazIowLFVCNhpoJFdYNkQ

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 oblique-markets-answer-with-sources-b6772196 -d '<json body>'
```

Example prompt: What are the key risks of holding ETH right now, and can you back up your answer with cited sources?

## When to prefer this

Choose this endpoint when you need not just an answer but verifiable citations — ideal for research, due diligence, compliance, or any context where the user needs to trust and verify the information. Prefer it over a plain LLM inference proxy when source attribution matters, and over raw web scraping when you want a synthesized, readable answer rather than raw extracted text.

## Known failure modes

- Missing or empty 'input' query parameter returns a 400 bad request
- Question too vague to retrieve relevant sources may return low-confidence or generic answer
- Payment failure or insufficient USDC balance results in 402 Payment Required
- Rate limiting or upstream LLM unavailability may cause 503 or timeout errors
- Some questions may have no retrievable sources, resulting in an answer without citations

## How this service works

Use when an agent needs a cited answer it can show its principal rather than a bare completion. Returns Concise answer to a research question with cited sources, a confidence level and a disclaimer. $0.65.

## Output

A structured response containing an LLM-generated answer to the query along with a list of cited sources (URLs or references) that support the answer, enabling the agent or end user to verify the information.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "question": {
   "type": "string",
   "description": "Question to answer with citations"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "model": "deepseek/deepseek-v4-flash",
  "answer": "x402 is an HTTP-native payment protocol: a server answers 402 with machine-readable terms, the client retries with a signed stablecoin payment, and a facilitator settles it on chain.",
  "message": "Answer with sources via x402 protocol",
  "sources": [
   {
    "url": "https://github.com/coinbase/x402",
    "title": "x402 protocol specification"
   }
  ],
  "question": "What is the x402 payment protocol?",
  "confidence": "high",
  "disclaimer": null,
  "generated_at": "2026-09-12T00:00:00.000Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/oblique-markets-answer-with-sources-b6772196/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.oblique.markets](https://www.zero.xyz/host/api.oblique.markets/llms.txt)