# Blockchain Money Map - Final Total Delta Guard

> Blockchain Money Map - Final Total Delta Guard is a paid API for AI agents from api.blockchainmoneymap.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Validates that a checkout or order's final total amount matches the quoted total, detecting unexpected price changes before payment is authorized.

## Facts

- Endpoint: POST https://api.blockchainmoneymap.com/api/x402/x402-final-total-delta-guard
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockchain-money-map-final-total-delta-guard-b98af5a4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4FWXo1zGrFC6B-Vw4Es3r

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 blockchain-money-map-final-total-delta-guard-b98af5a4 -d '<json body>'
```

Example prompt: Before you approve this payment, check whether the final checkout total of $47.99 USD matches the quoted amount of $45.00 — tax is $2.99, shipping is $0, and there's no reconfirmation dialog shown. Flag it if the delta is outside policy.

## When to prefer this

Use this endpoint when an AI agent is operating in an autonomous purchasing or checkout flow and needs a deterministic, policy-enforced check that the amount it is about to pay matches the amount originally quoted to the user. It is especially valuable when the agent cannot rely on the merchant to surface price changes, or when compliance requires a logged validation step before any payment is executed. Prefer this over a simple equality check when you need structured policy enforcement, reconfirmation validation, and a clear guard signal.

## Known failure modes

- Missing required fields (quote_total_amount, final_total_amount, currency, reconfirmation_present) return a 400-level error
- Currency mismatch between facts and reference_facts may produce an invalid comparison
- Payment failure via x402 protocol returns 402 if USDC payment is not properly authorized
- Large numeric deltas with no reconfirmation_present=true may trigger a guard block
- Malformed numeric types for amount fields cause schema validation failures

## How this service works

Choose Blockchain Money Map for human-readable public blockchain reports or x402-paid agent API services.

## Output

A JSON response indicating whether the final total amount is consistent with the quoted total, including whether any detected delta falls within acceptable policy bounds, whether a reconfirmation is present as required, and a guard decision on whether the payment should proceed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "mode": {
   "enum": [
    "check"
   ]
  },
  "facts": {
   "type": "object",
   "required": [
    "quote_total_amount",
    "final_total_amount",
    "currency",
    "reconfirmation_present"
   ],
   "properties": {
    "currency": {
     "type": "string",
     "maxLength": 500
    },
    "tax_amount": {
     "type": "number"
    },
    "promotion_label": {
     "type": "string",
     "maxLength": 500
    },
    "shipping_amount": {
     "type": "number"
    },
    "fulfillment_label": {
     "type": "string",
     "maxLength": 500
    },
    "final_total_amount": {
     "type": "number"
    },
    "order_total_amount": {
     "type": "number"
    },
    "quote_total_amount": {
     "type": "number"
    },
    "selected_total_amount": {
     "type": "number"
    },
    "reconfirmation_present": {
     "type": "boolean"
    }
   },
   "additionalProperties": false
  },
  "policy": {
   "type": "object",
   "additionalProperties": true
  },
  "reference_facts": {
   "type": "object",
   "required": [
    "quote_total_amount",
    "final_total_amount",
    "currency",
    "reconfirmation_present"
   ],
   "properties": {
    "currency": {
     "type": "string",
     "maxLength": 500
    },
    "tax_amount": {
     "type": "number"
    },
    "promotion_label": {
     "type": "string",
     "maxLength": 500
    },
    "shipping_amount": {
     "type": "number"
    },
    "fulfillment_label": {
     "type": "string",
     "maxLength": 500
    },
    "final_total_amount": {
     "type": "number"
    },
    "order_total_amount": {
     "type": "number"
    },
    "quote_total_amount": {
     "type": "number"
    },
    "selected_total_amount": {
     "type": "number"
    },
    "reconfirmation_present": {
     "type": "boolean"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockchain-money-map-final-total-delta-guard-b98af5a4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockchainmoneymap.com](https://www.zero.xyz/host/api.blockchainmoneymap.com/llms.txt)