# Agent Onchain Front-Running and Mempool Exposure Protection Procedure

> Agent Onchain Front-Running and Mempool Exposure Protection Procedure is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-20).

Returns a decision procedure brief for protecting agent onchain payments and DEX trades from mempool front-running, covering pattern scoring, private relay routing, timing jitter, slippage discipline, and batch-reveal grouping.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/agent-onchain-front-running-and-mempool-exposure?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-onchain-front-running-and-mempool-exposure-protection-procedure-5cfb92fc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W_0qRr5wnp2ZDzXafAS0M

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 agent-onchain-front-running-and-mempool-exposure-protection-procedure-5cfb92fc
```

Example prompt: My agent runs recurring x402 settlements and timer-driven DEX trades — can you give me a decision procedure for scoring their front-run risk and tell me which value thresholds should trigger private relay routing, how to jitter timing, and what slippage discipline to apply?

## When to prefer this

Choose this endpoint when your agent needs structured, actionable guidance on mempool exposure and front-running risk for onchain payments or DEX trades — particularly for recurring x402 settlements, scheduled payments, or timer-driven trades where predictable patterns create MEV vulnerability. Prefer this over generic MEV documentation when you need a scored decision procedure with concrete thresholds, routing recommendations, and a fallback ladder tailored to autonomous agent payment workflows.

## Known failure modes

- Payment not received — returns HTTP 402 requiring USDC payment before content is served
- Invalid method — only GET/HEAD/DELETE accepted; POST or PUT returns method-not-allowed error
- Topic override not recognized — procedure may default to generic front-running guidance rather than topic-specific advice
- Service temporarily unavailable — upstream LLM or reasoning engine failure returns non-OK response
- Stale generation — generatedAt timestamp may indicate cached rather than fresh reasoning if LLM is rate-limited

## How this service works

Decision procedure for when an agent's predictable onchain payment or trade needs mempool opacity. Covers: front-runnable pattern scoring for scheduled payments, recurring x402 settlements, and timer-driven DEX trades; value thresholds that trigger private-transaction relay routing; timing randomization and deadline jitter to break mempool prediction; slippage and priority-fee discipline for visible transactions; batch-and-reveal grouping for multi-part settlements; and the fallback ladder from

## Output

A structured decision procedure brief containing: a front-runnable pattern score for the agent's payment or trade type, value thresholds that trigger private-transaction relay routing, timing randomization and deadline jitter recommendations, slippage and priority-fee discipline rules for visible transactions, batch-and-reveal grouping guidance for multi-part settlements, and a fallback ladder from private relay through alternative protection strategies. Delivered as prose text with optional topic override, plus generation metadata (model, timestamp, generation source).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Agent onchain front-running and mempool exposure protection procedure paid response",
     "$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": {
         "
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-onchain-front-running-and-mempool-exposure-protection-procedure-5cfb92fc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so-8080.on.ascii.dev](https://www.zero.xyz/host/k2so-8080.on.ascii.dev/llms.txt)