# Ardaro Invoice Matching > Ardaro Invoice Matching is a paid API for AI agents from agents.getardaro.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-14). Compares a single invoice against a purchase order line-by-line and returns a structured discrepancy report for human review, without approving payment or posting to financial systems. ## Facts - Endpoint: POST https://agents.getardaro.com/v1/invoice-matching/analyze - Price: $0.5/call - Payment: x402 - Status: unknown - Last checked: 2026-09-14 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/ardaro-invoice-matching-62b3808a - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fqd9TrEzRMwRxAF_notKx 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 ardaro-invoice-matching-62b3808a -d '' ``` Example prompt: Can you check if supplier invoice INV-2024-0891 from supplier S-4421 matches PO PO-2024-3310? The invoice is in USD, has one line item for 10 units of 'Widget A' at $20.00 each (line ID L-001, mapped to PO line PO-L-001), subtotal $200.00, tax $14.00, total $214.00 — flag any discrepancies for my AP team to review. ## When to prefer this Choose this endpoint when you need a deterministic, auditable, stateless invoice-to-PO comparison for a single invoice before human AP review — especially when you need documented policy boundaries (no payment approval, no financial posting, no delivery verification) that satisfy compliance requirements. Prefer this over general-purpose LLM analysis when you need reproducible results and explicit discrepancy enumeration. Not suitable for bulk batch processing of many invoices in one call, for payment execution, or for delivery/receipt verification. ## Known failure modes - Missing required invoice fields (currency, line_items, reference, supplier_id, purchase_order_reference) returns a validation error - Invalid currency code not in the allowed enum returns a schema error - Line item quantity of zero is rejected by schema validation - Malformed numeric strings (e.g. amounts with more than two decimal places for non-JPY) fail pattern validation - PO line ID references that don't resolve to any PO line result in unmatched invoice lines - Arithmetic inconsistencies between supplied line amounts and totals are surfaced as discrepancies, not errors - Truncated or missing PO data may result in unknown_check outcomes rather than matched/unmatched classification ## How this service works Evidence-bounded visibility into publicly discoverable x402 agent services. ## Output Returns a JSON object containing: a policy block (documenting what checks were and were not performed, that human review is always required, and that no payment approval or financial posting occurs), a summary block (overall outcome such as 'no_discrepancies' or 'discrepancies_found', counts of matched/unmatched lines, and unknown checks), an arithmetic block (computed and supplied totals, subtotals, tax, rounding mode), a list of discrepancies (empty if none found), and an array of comparison rows (one per invoice line, showing match method, invoice and PO values, and per-line outcome). ## Request schema (JSON Schema) ```json { "type": "object", "properties": { "invoice": { "type": "object", "allOf": [ { "if": { "properties": { "currency": { "const": "JPY" } } }, "then": { "properties": { "tax": { "type": "string", "pattern": "^(?:0|[1-9][0-9]{0,25})(?![\\s\\S])", "maxLength": 26 }, "total": { "type": "string", "pattern": "^(?:0|[1-9][0-9]{0,25})(?![\\s\\S])", "maxLength": 26 }, "subtotal": { "type": "string", "pattern": "^(?:0|[1-9][0-9]{0,25})(?![\\s\\S])", "maxLength": 26 }, "line_items": { "type": "array", "items": { "type": "object", "properties": { "amount": { "type": "string", "pattern": "^(?:0|[1-9][0-9]{0,25})(?![\\s\\S])", "maxLength": 26 } } } } } } } ], "required": [ "currency", "line_items", "purchase_order_reference", "reference", "supplier_id" ], "properties": { "tax": { "type": "string", "pattern": "^(?:0|[1-9][0-9]{0,25})(?:\\.[0-9]{1,2})?(?![\\s\\S])", "maxLength": 29 }, "total": { "type": "string", "pattern": "^(?:0|[1-9][0-9]{0,25})(?:\\.[0-9]{1,2})?(?![\\s\\S])", "maxLength": 29 }, "currency": { "enum": [ "USD", "EUR", "GBP", "CAD", "AUD", "MXN", "JPY" ], "type": "string" }, "subtotal": { "type": "string", "pattern": "^(?:0|[1-9][0-9]{0,25})(?:\\.[0-9]{1,2})?(?![\\s\\S])", "maxLength": 29 }, "reference": { "type": "string", "maxLength": 80, "minLength": 1 }, "line_items": { "type": "array", "items": { "type": "object", "required": [ "description", "line_id", "quantity", "unit", "unit_price" ], "properties": { "unit": { "type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:/-]*(?![\\s\\S])", "maxLength": 32, "minLength": 1 }, "amount": { "type": "string", "pattern": "^(?:0|[1-9][0-9]{0,25})(?:\\.[0-9]{1,2})?(?![\\s\\S])", "maxLength": 29 }, "line_id": { "type": "string", "pattern": "^[A-Za-z0-9][A-Za-z0-9._:/-]*(?![\\s\\S])", "maxLength": 80, "minLength": 1 }, … (truncated) ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "result": { "policy": { "stateless": true, "model_calls": 0, "matching_rule": "explicit_po_line_id_else_unique_case_sensitive_product_code", "decision_scope": "No discrepancies means only that the supported checks found none in supplied data. Human review is always required.", "quantity_scope": "Only this invoice is counted; prior invoices and deliveries are not checked. Uninvoiced quantity is not evidence of undelivered goods. Uncertain allocation makes affected PO quantities unavailable.", "supplier_scope": "Supplier identifiers are caller-supplied matching identifiers; supplier identity and document authenticity are not verified.", "arithmetic_scope": "Supplied line amounts and totals are checked using per-line rounding. Tax applicability, discounts, shipping, and alternate rounding policies are not inferred.", "identity_purpose": "deterministic_result_comparison_only", "human_review_required": true, "raw_documents_retained": false, "payment_approval_supported": false, "financial_posting_performed": false, "financial_posting_supported": false, "delivery_verification_supported": false }, "summary": { "outcome": "no_discrepancies", "payment_approved": false, "delivery_verified": false, "discrepancy_count": 0, "invoice_line_count": 1, "unknown_check_count": 0, "human_review_required": true, "purchase_order_line_count": 1, "matched_invoice_line_count": 1, "unmatched_invoice_line_count": 0 }, "arithmetic": { "invoice_tax": "1.40", "invoice_total": "21.40", "rounding_mode": "ROUND_HALF_UP", "rounding_scope": "each_line_then_sum", "invoice_subtotal": "20.00", "invoice_total_status": "consistent", "computed_invoice_total": "21.40", "invoice_currency_scale": 2, "invoice_line_amount_sum": "20.00", "invoice_subtotal_status": "consistent", "purchase_order_currency_scale": 2, "invoice_supplied_line_amount_sum": "20.00" }, "discrepancies": [], "comparison_rows": [ { "outcome": "no_discrepancies", "invoice_unit": "each", "match_method": "explicit_po_line_id", "invoice_amount": "20.00", "invoice_source": "/invoice/line_items/0", "invoice_line_id": "INV-1", "invoice_currency": "USD", "invoice_quantity": "2", "allocation_status": "allocated", "discrepancy_codes": [], "invoice_unit_price": "10", "purchase_orde … (truncated) ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ardaro-invoice-matching-62b3808a/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from agents.getardaro.com](https://www.zero.xyz/host/agents.getardaro.com/llms.txt)