# SignalDesk AI Fibonacci Calculator

> SignalDesk AI Fibonacci Calculator is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-09).

Computes the Fibonacci number at a given index (0–1000) and returns the result as a string.

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/math/fibonacci?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-09
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-fibonacci-calculator-79730ccb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eDgzOmzprEMZ3m-2MF4GD

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 signaldesk-ai-fibonacci-calculator-79730ccb -d '<json body>'
```

Example prompt: Calculate the Fibonacci number at index 200 for me.

## When to prefer this

Choose this endpoint when you need a quick, deterministic, paid-per-call Fibonacci computation via the x402 micropayment protocol, especially within agent workflows that already use x402/USDC billing. It is appropriate for single-index lookups (not batch sequence generation) where precise large-integer string output is needed for indices up to 1000.

## Known failure modes

- Index below 0 or above 1000 returns a validation error
- Non-integer or missing 'n' parameter causes a 400 bad request
- Payment failure or insufficient USDC balance results in a 402 Payment Required response
- Service unavailability on Cloudflare Workers returns a 5xx error
- Execution quota or rate limit exceeded returns an error response

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object with a single field 'fibonacci' containing the Fibonacci number at the requested index as a string (e.g. {"fibonacci": "55"}). The string format accommodates very large integers beyond standard numeric precision.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "n": {
   "type": "integer",
   "maximum": 1000,
   "minimum": 0,
   "description": "Index."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "fibonacci": "55"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-fibonacci-calculator-79730ccb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)