# Token Execution Fee Burden — Adjacent Period Changes

> Token Execution Fee Burden — Adjacent Period Changes is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Computes period-over-period changes in token execution fee as a ratio of notional value for a sequence of observations

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-token-fee-burden-period-changes?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/token-execution-fee-burden-adjacent-period-changes-a61b6a59
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jJcnjgJOyhuo29sjEnLh_

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 token-execution-fee-burden-adjacent-period-changes-a61b6a59 -d '<json body>'
```

Example prompt: I have four token trades — first trade had a $2 fee on $1000 notional, second had a $2.20 fee on $1100 notional, third had a $2 fee on $1000 notional, and fourth had a $2.20 fee on $1100 notional — can you calculate the adjacent period changes in my execution fee burden relative to notional?

## When to prefer this

Choose this endpoint when you need a deterministic, bounded calculation of how token execution fee burden (fee as fraction of notional) changes between consecutive observation periods — especially useful for sequential trade logs, algo execution audits, or broker comparison analysis. Prefer this over generic statistics tools when you specifically need adjacent-period delta semantics for fee-to-notional ratios in token trading contexts.

## Known failure modes

- Fewer than 2 rows provided — minimum 2 observations required for any period comparison
- More than 200 rows submitted — array exceeds maxItems limit
- notional_usd value of zero submitted — field has exclusiveMinimum of 0 to prevent division by zero
- fee_usd or notional_usd outside allowed range — values must be between 0 and 1e16
- Malformed row objects with missing required fields fee_usd or notional_usd
- Payment failure or insufficient USDC balance for 0.01 USDC per-call cost

## How this service works

Token execution fee relative to notional — Adjacent period changes: Adjacent period changes for Token execution fee relative to notional. Supplied token observations only. Deterministic calculation or caller-threshold verdict, not a live scan, safety proof or trade recommendation. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one bounded adjacent period changes report.

## Output

A bounded report showing the adjacent period-over-period changes in the ratio of execution fee (fee_usd) to notional value (notional_usd) across the supplied sequence of token trade observations, computed deterministically from the provided data without live market data or trade recommendations.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "fee_usd",
     "notional_usd"
    ],
    "properties": {
     "fee_usd": {
      "type": "number",
      "default": 2,
      "maximum": 10000000000000000,
      "minimum": 0
     },
     "notional_usd": {
      "type": "number",
      "default": 1000,
      "maximum": 10000000000000000,
      "minimum": 0,
      "exclusiveMinimum": 0
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "fee_usd": 2,
     "notional_usd": 1000
    },
    {
     "fee_usd": 2.2,
     "notional_usd": 1100
    },
    {
     "fee_usd": 2,
     "notional_usd": 1000
    },
    {
     "fee_usd": 2.2,
     "notional_usd": 1100
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-execution-fee-burden-adjacent-period-changes-a61b6a59/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)