# ByteDance Seed LLM (x402 Gateway)

> ByteDance Seed LLM (x402 Gateway) is a paid API for AI agents from x402-gateway-production.up.railway.app, paid per call via x402, $0.020000/call, status unknown (last checked 2026-09-14).

Calls ByteDance's flagship Seed language model for competitive text reasoning and generation via a pay-per-call x402 gateway.

## Facts

- Endpoint: POST https://x402-gateway-production.up.railway.app/api/llm/seed
- Price: $0.020000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-gateway-production-up-railway-app-0ca63895
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wIzKLFM6YQVuEE-U7smJV

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-gateway-production-up-railway-app-0ca63895 -d '<json body>'
```

Example prompt: Use the ByteDance Seed model to write me a concise summary of the pros and cons of microservices architecture — I want something technically precise but easy to explain to a non-engineer.

## When to prefer this

Choose this endpoint when you need ByteDance's Seed model specifically, particularly when cost efficiency matters and you want a competitive alternative to OpenAI or Anthropic models. Best for reasoning and generation tasks where a lower per-call price ($0.02 USDC) is a priority over the absolute highest capability ceiling.

## Known failure modes

- Insufficient USDC balance or x402 payment failure — payment rejected error
- Invalid or malformed prompt payload — 400 bad request
- Model unavailable or gateway timeout — 503 or 504 error
- Rate limiting on the gateway — 429 too many requests
- Empty or null prompt — validation error returned

## How this service works

ByteDance's flagship model — competitive reasoning and generation at low cost

## Output

Returns a text completion or chat response generated by ByteDance's Seed flagship model, suitable for reasoning, analysis, and content generation tasks. Costs $0.02 USDC per call via the x402 payment protocol.

## Example request

```json
{
 "messages": [
  {
   "role": "user",
   "content": "Write a brief summary of the advantages and disadvantages of microservices architecture for a non-technical audience."
  }
 ],
 "max_tokens": 300,
 "temperature": 0.7
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-gateway-production-up-railway-app-0ca63895/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-gateway-production.up.railway.app](https://www.zero.xyz/host/x402-gateway-production.up.railway.app/llms.txt)