# Delx Backoff Schedule

> Delx Backoff Schedule is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).

Calculates a bounded exponential backoff schedule given a number of retry attempts, base delay, and cap, returning a machine-readable list of wait intervals.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/backoff-schedule
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-backoff-schedule-4591cd4c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pJBrGWxVGcbO4_vTm_HCA

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 delx-backoff-schedule-4591cd4c -d '<json body>'
```

Example prompt: Calculate an exponential backoff schedule for 6 retry attempts, starting at 250ms base delay and capped at 30 seconds.

## When to prefer this

Choose this endpoint when you need a deterministic, stateless, bounded exponential backoff schedule computed server-side without shipping math logic locally. Ideal for autonomous agents and workflows that need machine-readable retry timing before acting on untrusted input or calling unreliable upstream APIs. Prefer it over hand-coding backoff logic when you want validated, capped intervals without managing the arithmetic yourself.

## Known failure modes

- Invalid parameter values (e.g. attempts > 20, cap_ms > 3600000) return a structured validation error without billing
- Missing required fields fall back to documented defaults
- Malformed JSON body returns a 400-level error

## How this service works

Calculate a bounded exponential backoff schedule for reliable autonomous retries. Use it before an autonomous workflow acts on untrusted input, changes an API, retries a request, or evaluates production reliability. Returns bounded machine-readable JSON for $0.002 USDC via x402 on Base. Execution is deterministic, first-party, local-only, stateless, and does not call an upstream provider; structured validation failures are not billed.

## Output

Returns a machine-readable JSON array of wait intervals in milliseconds, one per retry attempt, computed as bounded exponential backoff values (e.g. [250, 500, 1000, 2000, ...]) capped at the specified maximum. The schedule is deterministic and stateless — the same inputs always produce the same output.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "cap_ms": {
   "type": "integer",
   "default": 30000,
   "maximum": 3600000,
   "minimum": 1
  },
  "base_ms": {
   "type": "integer",
   "default": 250,
   "maximum": 60000,
   "minimum": 1
  },
  "attempts": {
   "type": "integer",
   "default": 4,
   "maximum": 20,
   "minimum": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "schema": "delx/backoff-schedule/v1",
  "strategy": "exponential_cap",
  "delays_ms": [
   250,
   500,
   1000,
   2000
  ],
  "jitter_range": "0..delay_ms (full jitter recommended at execution time)",
  "total_delay_ms": 3750
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-backoff-schedule-4591cd4c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)