Invoice and Receipt Extraction

Read an invoice or receipt from an image or PDF. Returns line items, totals, dates, supplier details and VAT amounts.

Pay by wallet (x402) AI-generated invoice-extract

Example

Example answer

{
  "iban": null,
  "currency": null,
  "due_date": null,
  "subtotal": null,
  "vat_rate": null,
  "buyer_vat": null,
  "buyer_name": null,
  "confidence": {
    "line_items": "low",
    "vat_amount": "low",
    "vendor_name": "low",
    "total_amount": "low"
  },
  "line_items": [],
  "vat_amount": null,
  "vendor_vat": null,
  "vendor_name": null,
  "invoice_date": null,
  "total_amount": null,
  "invoice_number": null,
  "payment_reference": null
}

Inputs

Field	Type	Required	What it is
`url`	string	No	URL to invoice image or PDF
`base64`	string	No	Base64-encoded invoice file

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`iban`	string	Usually (present for most inputs)
`currency`	string	Usually (present for most inputs)
`due_date`	string	Usually (present for most inputs)
`subtotal`	number	Usually (present for most inputs)
`vat_rate`	number	Usually (present for most inputs)
`buyer_vat`	string	Usually (present for most inputs)
`buyer_name`	string	Usually (present for most inputs)
`confidence`	object	Sometimes (present only for some inputs)
`line_items`	array	Sometimes (present only for some inputs)
`vat_amount`	number	Usually (present for most inputs)
`vendor_vat`	string	Usually (present for most inputs)
`vendor_name`	string	Usually (present for most inputs)
`invoice_date`	string	Usually (present for most inputs)
`total_amount`	number	Usually (present for most inputs)
`invoice_number`	string	Usually (present for most inputs)
`payment_reference`	string	Usually (present for most inputs)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "invoice-extract",
    "inputs": {
      "url": "https://httpbin.org/image/jpeg"
    },
    "max_price_cents": 50
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "invoice-extract",
    "inputs": {
      "url": "https://httpbin.org/image/jpeg"
    },
    "max_price_cents": 50
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "invoice-extract",
  inputs: {
    "url": "https://httpbin.org/image/jpeg"
  },
  max_price_cents: 50,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="invoice-extract",
    inputs={
        "url": "https://httpbin.org/image/jpeg",
    },
    max_price_cents=50,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i -X POST https://api.strale.io/x402/v2/invoice-extract \
  -H 'Content-Type: application/json' \
  -d '{
    "url": "https://httpbin.org/image/jpeg"
  }'

Limitations

Handwritten or unusual layouts reduce accuracy
Best results with standard invoice layouts — handwritten invoices or heavily stylised designs may have lower accuracy
What to do instead: For non-standard formats, use pdf-extract for raw text and apply custom parsing rules
Extracted totals and tax figures need checking
AI extraction from invoice documents — line item totals and tax calculations should be verified against source
What to do instead: Validate that extracted line items sum to the total amount and cross-check VAT calculations before booking
Input documents are limited to 8 MiB decoded
Documents supplied by URL or base64 are refused above 8 MiB of decoded data, with a caller_input error naming the input field and no charge. Reduce the document size or split it before submitting.

Bundled checks that include it

Invoice Processing Pipeline €0.50