# Synapse Random Fact API

> Synapse Random Fact API is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Returns a random interesting fact with its category via a pay-per-call x402 micropayment endpoint

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/random-fact?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-random-fact-api-4827484c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0-dqssc89QJJ3eO8kqR9i

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 synapse-random-fact-api-4827484c
```

Example prompt: Give me a random interesting fact — something surprising or educational I probably didn't know.

## When to prefer this

Choose this endpoint when you need a lightweight, no-account, pay-per-call random fact with no setup friction. Ideal for agents that need occasional trivia or icebreaker content and want to pay micro-amounts per call rather than maintaining a subscription. Not suitable if you need facts filtered by a specific category or topic.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 Payment Required
- Network or server unavailability on the DuckDNS host — returns connection timeout or 5xx error
- Malformed payment header — rejected before fact is returned

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

A JSON object containing a 'fact' field with the full text of a random interesting fact, and a 'category' field indicating the topic area (e.g. 'general'). No pagination or filtering — each call returns one randomly selected fact.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "fact": "Honey never spoils. Archaeologists have found pots of honey in ancient Egyptian tombs that are over 3000 years old and still edible.",
  "category": "general"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-random-fact-api-4827484c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)