Check tax amounts against a rate schedule the caller supplies
Check tax amounts against a rate schedule the caller supplies. When a declared amount disagrees, the other inclusivity formula is tried too: if that one gives the declared figure, the finding says the policy and the data disagree rather than that the arithmetic is wrong, which is a different correction. Also reports a code absent from the schedule, a line rate disagreeing with it, and an amount too precise for the currency. Not tax advice.
Answeringour last check, 2026-10-04
1 of 1checks answered this week
7540 msmedian answer time
$0.18listed price per call
$0.18price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.zfinia.com/x402/v1/tax-computation-audit
| Category | Code and developer |
|---|---|
| Provider host | api.zfinia.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-04 | valid payment request | 402 | $0.18 | 7540 ms |
Example input (from the provider)
{
"body": {
"currency": "GBP",
"lines": [
{
"base": "100.00",
"description": "Consulting",
"tax_amount": "20.00",
"tax_code": "STD"
},
{
"base": "100.00",
"description": "Licence",
"tax_amount": "16.67",
"tax_code": "STD"
},
{
"base": "80.00",
"description": "Books",
"tax_amount": "16.00",
"tax_code": "RED",
"tax_rate": "20"
},
{
"base": "40.00",
"description": "Export",
"tax_amount": "0",
"tax_code": "OUT"
},
{
"base": "9.99",
"description": "Postage",
"tax_amount": "1.998",
"tax_code": "STD"
}
],
"policy": {
"rounding": "half_up",
"tax_inclusive": false
},
"schedule": [
{
"code": "STD",
"description": "standard",
"rate": "20"
},
{
"code": "RED",
"description": "reduced",
"rate": "5"
},
{
"code": "ZER",
"description": "zero",
"rate": "0"
}
]
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"currency": {
"maxLength": 8,
"type": "string"
},
"lines": {
"items": {
"additionalProperties": false,
"properties": {
"base": {
"type": [
"string",
"number"
]
},
"description": {
"maxLength": 512,
"type": "string"
},
"tax_amount": {
"type": [
"string",
"number"
]
},
"tax_code": {
"maxLength": 64,
"type": "string"
},
"tax_rate": {
"type": [
"string",
"number"
]
}
},
"required": [
"base",
"tax_code"
],
"type": "object"
},
"maxItems": 500,
"minItems": 1,
"type": "array"
},
"policy": {
"additionalProperties": false,
"properties": {
"minor_units": {
"type": "object"
},
"rounding": {
"enum": [
"half_up",
"half_even",
"down",
"up"
],
"type": "string"
},
"tax_inclusive": {
"type": "boolean"
}
},
"type": "object"
},
"schedule": {
"items": {
"additionalProperties": false,
"properties": {
"code": {
"maxLength": 64,
"type": "string"
},
"description": {
"maxLength": 256,
"type": "string"
},
"rate": {
"type": [
"string",
"number"
]
}
},
"required": [
"code",
"rate"
],
"type": "object"
},
"maxItems": 200,
"minItems": 1,
"type": "array"
}
},
"required": [
"lines",
"currency",
"schedule"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}