# Hergert Synthora Inference API

> Hergert Synthora Inference API is a paid API for AI agents from api.hergertsynthora.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).

Runs LLM text inference via a self-hosted autonomous agent infrastructure, returning a signed text response for a given prompt.

## Facts

- Endpoint: POST https://api.hergertsynthora.com/v1/inference?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hergert-synthora-inference-api-92bdd9e9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WCTeC-EB99Keu31JJK-aU

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-inference-api-92bdd9e9 -d '<json body>'
```

Example prompt: Ask the Hergert Synthora inference endpoint to explain how x402 micropayment protocol works, using the system prompt 'You are a concise technical expert' and up to 300 output tokens.

## When to prefer this

Choose this endpoint when you need LLM text inference with cryptographic output signing, want to pay per call in USDC via x402 micropayments, or require a self-sovereign inference provider not tied to major cloud AI providers. Particularly useful for agents operating in autonomous payment-native workflows where each inference call is billed independently.

## Known failure modes

- Payment not received or x402 payment header missing — returns 402 Payment Required
- Prompt exceeds model context window — may return error or truncated output
- Invalid or missing prompt field — returns validation error
- Service unavailable due to self-hosted infrastructure downtime — returns 5xx error
- max_tokens value out of acceptable range — may return error or be clamped to default

## How this service works

Garantizamos soberanía digital mediante ejecución autónoma. Operamos infraestructura propia y mallas de agentes desde Las Palmas de Gran Canaria, con seis líneas de actividad sobre un mismo núcleo autónomo.

## Output

A JSON object with ok=true, a niche field set to 'inference', and a result object containing the generated text string and an ed25519 cryptographic signature of that output.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "prompt": {
   "type": "string",
   "description": "The prompt to run"
  },
  "system": {
   "type": "string",
   "description": "Optional system prompt"
  },
  "max_tokens": {
   "type": "integer",
   "description": "Max output tokens (default 400)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "inference",
  "result": {
   "text": "x402 is an HTTP-native micropayment protocol…",
   "signed": "ed25519"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hergert-synthora-inference-api-92bdd9e9/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)