# Linkrra Pearl Pool — OpenAI-Compatible Chat Completions via x402

> Linkrra Pearl Pool — OpenAI-Compatible Chat Completions via x402 is a paid API for AI agents from pool.linkrra.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Runs an OpenAI-compatible chat completion request, charging $0.01 USDC per call via the x402 payment protocol on Base mainnet

## Facts

- Endpoint: POST https://pool.linkrra.com/api/billing/x402/chat/completions?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/linkrra-pearl-pool-openai-compatible-chat-completions-via-x402-9b1aa2d0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2FNhrjDlMQwRIkjwpcLA_

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 linkrra-pearl-pool-openai-compatible-chat-completions-via-x402-9b1aa2d0 -d '<json body>'
```

Example prompt: Send this chat prompt to Linkrra Pearl Pool and pay per request in USDC on Base: 'Explain the concept of zero-knowledge proofs in simple terms' — use whichever model is cheapest in the catalogue.

## When to prefer this

Choose this endpoint when you need OpenAI-compatible LLM inference with per-request USDC billing on Base mainnet via the x402 protocol — ideal for crypto-native apps, autonomous agents that hold on-chain balances, or any use case where pay-as-you-go stablecoin micropayments are preferred over subscription-based API keys.

## Known failure modes

- 402 Payment Required — x402 challenge returned if payment is missing or malformed
- Invalid or unsupported model name — model not found in /v1/models catalogue
- Malformed request body — missing required messages or model field returns 400
- Payment underfunded — USDC amount below per-model price triggers rejection
- Network issues on Base — transaction fails to confirm, inference not executed
- Rate or capacity limits from the GPU pool — may return 503 if no providers available

## How this service works

Linkrra Synap inference — pay-per-call chat completion for model "glm-4.6". Price covers up to 16 output tokens, billed at this model's own per-token price (see GET /v1/models) converted at $0.2273 per million credits. Minimum charge $0.01 per paid call — a request whose usage-based price is below the minimum is quoted and settled at exactly the minimum, so a small call costs the minimum and not less. If the completion uses fewer tokens the difference is not refunded in v1 — it is credited to your paying wallet address on the same ledger the topup endpoint uses, so nothing is lost: spend it with another paid request, or register it as a free-standing account.

## Output

Returns an OpenAI-standard chat.completion JSON object with the assistant's reply in choices[0].message.content, plus token usage counts and a payment object containing the Base network transaction hash and the USD amount paid.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string"
    },
    "method": {
     "type": "string"
    },
    "bodyType": {
     "type": "string"
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-...",
  "usage": {
   "total_tokens": 0,
   "prompt_tokens": 0,
   "completion_tokens": 0
  },
  "object": "chat.completion",
  "choices": [
   {
    "message": {
     "role": "assistant",
     "content": "..."
    }
   }
  ],
  "payment": {
   "network": "eip155:8453",
   "paidUsd": 0,
   "transaction": "0x..."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/linkrra-pearl-pool-openai-compatible-chat-completions-via-x402-9b1aa2d0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pool.linkrra.com](https://www.zero.xyz/host/pool.linkrra.com/llms.txt)