# AgentData LLM Chat Completion (x402, No Account)

> AgentData LLM Chat Completion (x402, No Account) is a paid API for AI agents from agentdata-api.sander-van-aard.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Runs an OpenAI-style chat completion against one of three tiered models (DeepSeek Flash, GPT mini, DeepSeek Pro) billed per-call in USDC via x402 — no API key or account required.

## Facts

- Endpoint: POST https://agentdata-api.sander-van-aard.workers.dev/llm/chat
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentdata-llm-chat-completion-x402-no-account-2b3adaca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__HX7ht6CMaeJw2GDwW2B6

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 agentdata-llm-chat-completion-x402-no-account-2b3adaca -d '<json body>'
```

Example prompt: Use the smart tier ($0.02) to answer this question with an OpenAI-style chat call — no API key needed, just pay per call in USDC: 'Summarize the key differences between transformer and mamba architectures in three bullet points.'

## When to prefer this

Choose this endpoint when you need LLM chat completions without managing API keys, rate limits, or monthly billing — ideal for agents that need pay-per-use inference billed in USDC on Base via x402. Best when you want predictable flat per-call pricing across fast, smart, or reasoning tiers and can tolerate the model being sourced from either DeepSeek or OpenAI depending on tier.

## Known failure modes

- 503 if the selected model or upstream source is unavailable — no charge incurred
- 402 with tier price quoted if payment has not yet been provided
- Input exceeds per-tier character cap (16k chars for fast, 32k for higher tiers) — request rejected
- Malformed messages array or missing required body fields returns a 4xx validation error
- Network timeout on the Cloudflare Workers edge layer

## How this service works

LLM chat completion per call — no account, no API key, no token math. Three flat-priced tiers: fast $0.002 (DeepSeek v4 Flash), smart $0.02 (GPT-5.4 mini), reasoning $0.03 (DeepSeek v4 Pro). Send OpenAI-style messages, get the assistant reply with finish_reason and token usage. Input capped per tier (16k-32k chars); the 402 quotes the exact tier price up front. Model or source unavailable means a 503 and you pay nothing. USDC on Base.

## Output

Returns the assistant's reply text along with finish_reason (e.g. 'stop') and token usage counts for the request. If the model or source is unavailable a 503 is returned and no charge is made; a 402 response quotes the exact tier price before the call is executed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentdata-llm-chat-completion-x402-no-account-2b3adaca/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdata-api.sander-van-aard.workers.dev](https://www.zero.xyz/host/agentdata-api.sander-van-aard.workers.dev/llms.txt)