# Withdrawal Latency Index Across Custodial and Rail Options

> Withdrawal Latency Index Across Custodial and Rail Options is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).

Ranks custodial and payment-rail withdrawal options by exit speed, producing latency-tier verdicts, a normalized exit-speed index, park/no-park recommendations, and re-check cadences for idle USDC treasury management.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/withdrawal-latency-index-across-custodial-and-ra?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/withdrawal-latency-index-across-custodial-and-rail-options-6bbf85eb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KVZh4a28B-lrjTakTxv8M

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 withdrawal-latency-index-across-custodial-and-rail-options-6bbf85eb
```

Example prompt: Before I park our idle USDC, rank Coinbase Custody, Fireblocks, and the x402 rail by withdrawal speed — I need to know which ones are instant vs multi-day, an exit-speed index normalized to the fastest option, and a re-check schedule for any that have drifting windows.

## When to prefer this

Choose this endpoint when an agent needs a deterministic, policy-aligned ranking of custodial or rail withdrawal speed before committing idle USDC to a parking position. It is especially valuable when multiple custodians or rails are under consideration simultaneously and you need normalized comparisons, tiered verdicts, and re-check schedules in one call rather than manually aggregating latency data. Prefer it over generic research or web-search tools when you need a structured treasury-policy-aware recommendation rather than raw data.

## Known failure modes

- Missing or malformed query parameters may return a generic or topic-mismatched decision procedure
- LLM or reasoning backend unavailability may result in a non-200 response or degraded output
- Payment not settled (x402 flow) returns 402 with payment instructions rather than the result
- Stale or drifted withdrawal window data submitted as input may produce outdated tier verdicts
- Rate limiting or credit exhaustion on the facilitator side may block the call mid-session

## How this service works

Deterministic ranking procedure for custodial and rail exit-speed before parking idle USDC. Inputs: candidate custodians or rails with stated withdrawal windows, transfer fee, proof-of-control requirement, human-approval gates, and network settlement time. Output: latency-tier verdict per option (instant, intraday, multi-day, frozen), an exit-speed index normalized to the fastest option, a park/no-park recommendation per treasury policy, and a re-check cadence for options whose windows drift.

## Output

A structured decision-procedure brief containing: a latency-tier verdict per option (instant, intraday, multi-day, or frozen), a normalized exit-speed index relative to the fastest option, a park/no-park recommendation per treasury policy, and a suggested re-check cadence for options with drifting withdrawal windows. Response is plain-prose plus structured fields including generatedAt timestamp and generation source.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Withdrawal Latency Index Across Custodial and Rail Options paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "brief": {
         "type": "string",
         "description": "Decision procedure prose for agents"
        },
        "model": {
         "type": "string"
        },
        "topic": {
         "type": "string"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "procedure": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "generationSource": {
         "enum": [
          "llm",
          "reasoning",
          "deterministic"
         ],
         "type": "string"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         "type": "str
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "brief": "plain prose decision procedure (120+ words)",
   "model": "deepseek/deepseek-v4-flash-0731",
   "topic": "string topic",
   "service": "withdrawal-latency-index-across-custodial-and-ra",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "withdrawal-latency-index-across-custodial-and-ra",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/withdrawal-latency-index-across-custodial-and-rail-options-6bbf85eb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)