# Delx Cost Per Success

> Delx Cost Per Success is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-20).

Computes cost per successful delivery by dividing total cost by the number of successful deliveries

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/cost-per-success?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-cost-per-success-5ca3fcae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4qySsT65Ch32RGdLLp1c0

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-cost-per-success-5ca3fcae -d '<json body>'
```

Example prompt: We spent $4,200 total this week and had 1,400 successful deliveries — what was our cost per success?

## When to prefer this

Choose this endpoint when you need a simple, deterministic, serverless computation of cost-per-success from raw totals — especially in SRE, ops, or delivery pipeline contexts where you want a zero-dependency, stateless calculation without maintaining your own math logic. Prefer it over general-purpose code execution when you want a reliable, auditable, cheap API call that returns structured JSON directly consumable by downstream agents.

## Known failure modes

- Division by zero if success_count is 0 or missing
- Missing required fields (total_cost or success_count) result in validation error
- Non-numeric inputs cause schema rejection
- Negative values may produce nonsensical results if not validated by caller

## How this service works

Compute cost per successful delivery from total cost and success count — call when dividing total cost by successful deliveries. Use for SRE/ops math agents buy from broad utility catalogs: SLA, error budget, success rate, and health scores with zero upstream cost. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, and no claim of live chain tip, web search, or…

## Output

A deterministic JSON object containing the computed cost-per-success value, derived by dividing total_cost by success_count. The response is machine-readable and stateless, with no upstream data fetched.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "total_cost": {
   "type": "number",
   "description": "Total cost incurred in the window."
  },
  "success_count": {
   "type": "number",
   "description": "Number of successful deliveries."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "schema": "delx/util-cost-per-success/v1",
  "total_cost": 12.5,
  "success_count": 50,
  "cost_per_success": 0.25
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-cost-per-success-5ca3fcae/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)