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Delx Fibonacci
x402
Delx Fibonacci is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Computes the Nth Fibonacci number for integer n up to 78, returning a structured JSON receipt for a micropayment of $0.001 USDC.
Price / call$0.001
Success—
StatusUnknown
How this service works
Nth Fibonacci (n≤78). Use for sequences, demos, or test fixtures without shipping a math package. Returns F(n) for n up to 78 with a structured receipt. $0.001 USDC per successful call via x402 on Base—deterministic first-party JSON, no API key, no subscription, and nothing is billed on structured validation errors.
Output
Returns a structured JSON object containing the input index n, the computed Fibonacci value F(n), and a receipt confirming the successful call. No extraneous data; deterministic and consistent across calls for the same n.
Example use cases
Test fixture seed generation
“I need a deterministic integer seed for my test suite — can you get me the 30th Fibonacci number as a structured result?”
Educational sequence demo
“Can you show me the Fibonacci value at position 20 to use as a live demo in my math lesson?”
Validating a math library output
“My code says F(55) is 139583862445 — can you confirm the correct 55th Fibonacci number so I can check if that's right?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/fibonacciWhen to prefer
Choose this endpoint when you need a reliable, server-side computation of a Fibonacci number without shipping or maintaining a math library in your agent's runtime. Ideal for test fixtures, demos, or pipeline steps that need a deterministic integer value. Prefer it over local computation when you want a first-party signed receipt to prove the result. Not suited for computing sequences beyond index 78 or for bulk generation of many Fibonacci numbers in a single call.
Side effects
- n out of range (n > 78 or n < 0): returns a structured validation error and no charge is applied
- non-integer input for n: returns a validation error with no billing
- missing n field: returns a structured error, no charge
- payment failure or insufficient USDC balance: call does not proceed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| n | integer | Integer input (see tool summary for allowed range). |
Output
Schema · Response
{
"type": "json",
"example": {
"n": 42,
"value": 267914296,
"schema": "delx/fibonacci/v1"
}
}Tags
x402
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