# HERGERT SYNTHORA LLM Fast Inference

> HERGERT SYNTHORA LLM Fast Inference is a paid API for AI agents from api.hergertsynthora.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-15).

Runs a fast LLM chat/completion call via Synthora's autonomous agent mesh, returning a text result with a cryptographic receipt.

## Facts

- Endpoint: POST https://api.hergertsynthora.com/v1/llm-fast?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hergert-synthora-llm-fast-inference-77298443
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P0mKJDr6uW5ZoHS5taSn8

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 hergert-synthora-llm-fast-inference-77298443 -d '<json body>'
```

Example prompt: Send this prompt to Synthora's fast LLM endpoint using the 'llm_fast' tier — system prompt: 'You are a concise assistant', user message: 'Summarize the key risks of investing in small-cap stocks', max 512 tokens, temperature 0.7.

## When to prefer this

Choose this endpoint when you need a fast, pay-per-call LLM inference with a cryptographic receipt (ed25519) for auditability, priced in USDC via x402, from a European sovereign-infrastructure provider. Ideal for autonomous agent pipelines that require verifiable AI outputs without a subscription, or when operating in workflows that already use x402 micropayment rails.

## Known failure modes

- Invalid or unrecognized model label returns an error
- Prompt or messages array missing returns validation error
- max_tokens exceeds cap of 1024 — clamped or rejected
- Payment not received via x402 — 402 response before execution
- Temperature out of valid range causes parameter rejection
- Both 'prompt' and 'messages' supplied may cause ambiguity or rejection

## How this service works

SYNTHORA LLM Gateway FAST: OpenAI-compatible /v1/chat/completions pay-per-call, no API keys. Fast free-tier models (llama-3.1-8b class) with automatic upstream failover, Ed25519-signed. 0.005 USDC via x402 on Base. POST {"messages":[{"role":"user","content":"..."}]} (or {"prompt":"..."}).

## Output

A JSON object with 'ok' (boolean), 'niche' set to 'llm_fast', a 'result' object containing the LLM-generated text, and a 'receipt' object with an ed25519 cryptographic signature confirming the paid call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Etiqueta aceptada; el tier fija el modelo real"
  },
  "prompt": {
   "type": "string",
   "description": "Atajo sin messages"
  },
  "system": {
   "type": "string",
   "description": "System prompt opcional (con prompt)"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object"
   },
   "description": "OpenAI chat messages"
  },
  "max_tokens": {
   "type": "integer",
   "description": "Max output tokens (default 256, cap 1024)"
  },
  "temperature": {
   "type": "number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "llm_fast",
  "result": {},
  "receipt": {
   "alg": "ed25519"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hergert-synthora-llm-fast-inference-77298443/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.hergertsynthora.com](https://www.zero.xyz/host/api.hergertsynthora.com/llms.txt)