# Obol Stack Bounty Radar Chat Completions

> Obol Stack Bounty Radar Chat Completions is a paid API for AI agents from 4-obol-agent.dvlabs.dev, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Payment-gated LLM chat completions endpoint (OpenAI-compatible) served by the Obol Stack bounty-radar operator, requiring an x402 micropayment header per request

## Facts

- Endpoint: POST https://4-obol-agent.dvlabs.dev/services/bounty-radar/v1/chat/completions
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/obol-stack-bounty-radar-chat-completions-125df91e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n8wEDLD8oWVVzqu_QkMux

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 obol-stack-bounty-radar-chat-completions-125df91e -d '<json body>'
```

Example prompt: Ask the bounty-radar AI model (use claude-sonnet-4-6) to explain what makes a good bug bounty report — keep it to 300 tokens and use a temperature of 0.7.

## When to prefer this

Choose this endpoint when you need a pay-per-call, OpenAI-compatible chat completions interface backed by the x402 micropayment protocol — ideal for agent workflows that need metered LLM access without subscriptions, or when integrating with the Obol Stack decentralized operator ecosystem. Prefer this over hosted OpenAI/Anthropic APIs when you want crypto-native (USDC) per-request billing or when operating within an x402-aware agent framework.

## Known failure modes

- 402 Payment Required — missing or invalid X-PAYMENT header; response includes accepts[] with pricing details
- Invalid model identifier — model not listed in the operator's /api/services.json or 402 accepts[].extra
- Malformed messages array — missing required 'role' or 'content' fields
- Temperature out of range (must be 0–2) or max_tokens less than 1
- Operator node offline or unreachable — connection timeout or 5xx error
- Payment amount insufficient — operator rejects underpaid x402 payload

## How this service works

x402 payment-gated services advertised by this Obol Stack operator. Every operation expects an `X-PAYMENT` header carrying a signed x402 v2 payment payload; unpaid requests receive a 402 with `accepts[]` describing the prices the operator will honour. See https://www.x402.org for the wire protocol and https://github.com/ObolNetwork/obol-stack for the source.

Note: schemas for individual operations are derived heuristically from the underlying ServiceOffer's `type` field. Buyers using generated clients should treat request and response shapes as advisory until operators tighten them with explicit OpenAPI fragments.

## Output

Returns an OpenAI-compatible chat.completion JSON object containing the assistant's reply message, the model used, a unique completion ID, the finish reason (e.g. 'stop'), and the choice index. Streaming mode is also supported if requested.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Model identifier advertised in the 402 accepts[].extra or /api/services.json."
  },
  "stream": {
   "type": "boolean"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant",
       "tool"
      ],
      "type": "string"
     },
     "content": {
      "oneOf": [
       {
        "type": "string"
       },
       {
        "type": "array"
       },
       {
        "type": "null"
       }
      ]
     }
    },
    "additionalProperties": true
   }
  },
  "max_tokens": {
   "type": "integer",
   "minimum": 1
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-example",
  "model": "claude-sonnet-4-6",
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "Hello! How can I help you today?"
    },
    "finish_reason": "stop"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/obol-stack-bounty-radar-chat-completions-125df91e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 4-obol-agent.dvlabs.dev](https://www.zero.xyz/host/4-obol-agent.dvlabs.dev/llms.txt)