# Token Buy Receipt Shortfall — Before and After Comparison

> Token Buy Receipt Shortfall — Before and After Comparison is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).

Computes a deterministic before-and-after comparison of token buy receipt shortfall, reporting how actual tokens received differed from expected tokens across two observations.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-token-buy-receipt-compare?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/token-buy-receipt-shortfall-before-and-after-comparison-c2d74cf6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ObEGKfjXZZo1nlRCPrtpf

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-buy-receipt-shortfall-before-and-after-comparison-c2d74cf6 -d '<json body>'
```

Example prompt: Compare my token buy receipt shortfall before and after — before I expected 1000 tokens and got 950, and after I expected 1100 tokens and got 1045. How did the shortfall change?

## When to prefer this

Choose this endpoint when you need a fast, deterministic, cost-effective ($0.01 USDC) side-by-side shortfall calculation for exactly two token purchase observations. It is ideal for auditing whether a configuration change, fee adjustment, or swap parameter tweak improved or worsened token receipt accuracy. It is not a live market scanner or trade recommendation engine — use it when you already have two concrete (expected, actual) token pairs and need a structured comparison report.

## Known failure modes

- Missing required fields (expected_tokens or actual_tokens) in either before or after object returns a validation error
- expected_tokens set to zero or below fails due to exclusiveMinimum constraint
- Values exceeding the maximum (1e16) are rejected
- Malformed JSON body returns a 400-level error
- Payment not included or insufficient USDC triggers an x402 payment-required response

## How this service works

Token buy receipt shortfall — Before and after comparison: Before and after comparison for Token buy receipt shortfall. 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 before and after comparison report.

## Output

A bounded, deterministic report showing token shortfall (expected minus actual) for both the 'before' and 'after' observations, along with a comparative summary indicating how the shortfall changed between the two snapshots. Not a live scan, safety proof, or trade recommendation — purely a calculation based on the supplied figures.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "after": {
   "type": "object",
   "default": {
    "actual_tokens": 1045,
    "expected_tokens": 1100
   },
   "required": [
    "expected_tokens",
    "actual_tokens"
   ],
   "properties": {
    "actual_tokens": {
     "type": "number",
     "default": 950,
     "maximum": 10000000000000000,
     "minimum": 0
    },
    "expected_tokens": {
     "type": "number",
     "default": 1000,
     "maximum": 10000000000000000,
     "minimum": 0,
     "exclusiveMinimum": 0
    }
   },
   "additionalProperties": false
  },
  "before": {
   "type": "object",
   "default": {
    "actual_tokens": 950,
    "expected_tokens": 1000
   },
   "required": [
    "expected_tokens",
    "actual_tokens"
   ],
   "properties": {
    "actual_tokens": {
     "type": "number",
     "default": 950,
     "maximum": 10000000000000000,
     "minimum": 0
    },
    "expected_tokens": {
     "type": "number",
     "default": 1000,
     "maximum": 10000000000000000,
     "minimum": 0,
     "exclusiveMinimum": 0
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-buy-receipt-shortfall-before-and-after-comparison-c2d74cf6/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)