# Aubrai Longevity Chat (x402-api.aubr.ai)

> Aubrai Longevity Chat (x402-api.aubr.ai) is a paid API for AI agents from x402-api.aubr.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).

Send a longevity, aging, or lifespan science question to Aubrai and receive a request ID to poll for the AI-generated answer, with an option for a fast conversational reply or a deep research response with citations.

## Facts

- Endpoint: GET https://x402-api.aubr.ai/api/chat
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-api-aubr-ai-fc734191
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zClEG6Ca9VwAeL9xS0YJD

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 x402-api-aubr-ai-fc734191
```

Example prompt: Ask Aubrai, VitaDAO's longevity co-scientist, what the current evidence says about rapamycin extending lifespan in mammals — give me a deep research answer with citations, not just a quick reply.

## When to prefer this

Use this endpoint when a user needs a conversational or research-grade answer specifically about longevity, aging biology, or lifespan science — especially when citations from scientific literature are needed. Prefer the fast mode for quick factual questions and omit/set fast=false for in-depth research synthesis. Choose this over general-purpose LLM queries when domain expertise in geroscience and VitaDAO's curated knowledge base is valuable.

## Known failure modes

- Missing or empty message field returns an error
- Payment not provided or insufficient USDC balance causes 402 rejection
- Polling the request ID before the answer is ready returns a pending status
- Invalid fast parameter type (non-boolean) may cause a validation error
- Network timeout if polling exceeds the expected response window

## How this service works

Send a question about longevity, aging, or lifespan science. Returns a request ID to poll for the AI-generated answer from Aubrai, VitaDAO's decentralized co-scientist.

## Output

A request ID (conversation ID) that the agent can poll to retrieve the AI-generated answer. In fast mode, the answer arrives in 3-6 seconds with a conversational response; in deep mode (15-25 seconds), the answer includes citations and synthesized research findings from longevity and aging literature.

## Example request

```json
{
 "fast": true,
 "message": "What is the current scientific evidence on NAD+ boosting compounds and their effects on cellular aging?"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "fast": {
   "type": "boolean",
   "description": "true → quick conversational answer (3-6s). false/omit → deep research with citations (15-25s)."
  },
  "message": {
   "type": "string",
   "description": "Chat message"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "status": "queued",
  "requestId": "req_abc123"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-api-aubr-ai-fc734191/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-api.aubr.ai](https://www.zero.xyz/host/x402-api.aubr.ai/llms.txt)