# NexusAPI AI Chat Endpoint

> NexusAPI AI Chat Endpoint is a paid API for AI agents from nexus-api-virid.vercel.app, paid per call via x402, $0.073275/call, status unknown (last checked 2026-09-14).

Sends a natural language query to an AI chat model and returns a generated text response, payable per call in USDC on Base.

## Facts

- Endpoint: POST https://nexus-api-virid.vercel.app/api/ai/chat
- Price: $0.073275/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexusapi-ai-chat-endpoint-8795542d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OZQwGnRVXT3TaIFEHLx12

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 nexusapi-ai-chat-endpoint-8795542d -d '<json body>'
```

Example prompt: Ask the AI chat endpoint: 'What are the key differences between proof-of-work and proof-of-stake blockchains?' and give me the full response.

## When to prefer this

Choose this endpoint when you need a quick, keyless AI chat response and are willing to pay micro-amounts in USDC on Base per call, especially in agentic or automated pipelines where managing API keys is impractical and crypto-native micropayments are acceptable.

## Known failure modes

- Payment not received or insufficient USDC — returns 402 Payment Required
- Empty or missing query field — may return an error or empty response
- Model timeout or upstream LLM failure — returns 5xx server error
- Malformed JSON body — returns 400 Bad Request
- Rate limiting or capacity issues on the NexusAPI platform

## How this service works

Crypto, AI, Social Media, Finance, Weather, Tools &amp; more. Pay per call in USDC on Base. No API keys.

## Output

A JSON object containing an AI-generated text reply to the submitted query, produced by the underlying language model powering the NexusAPI chat endpoint.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "description": "Search query or input parameter"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "description": "API response data"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexusapi-ai-chat-endpoint-8795542d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nexus-api-virid.vercel.app](https://www.zero.xyz/host/nexus-api-virid.vercel.app/llms.txt)