# Accounting and invoicing APIs for AI agents

> 8 accounting & invoicing listings ranked by the Anchor benchmark. Leader Apideck Accounting API + MCP (BB). APIs for bookkeeping and invoicing: ledgers, invoices, bills, expenses and reports, straight from the accounting software or through one API across many. Compared on the objects covered, write access, sandboxes, rate limits and price.

- Canonical: https://www.anchorterminal.com/categories/accounting
- Markdown: https://www.anchorterminal.com/categories/accounting.md (~4,050 tokens)
- Slim: https://www.anchorterminal.com/categories/accounting.min.md (~480 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/categories/accounting.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

APIs for bookkeeping and invoicing: ledgers, invoices, bills, expenses and reports, straight from the accounting software or through one API across many. Compared on the objects covered, write access, sandboxes, rate limits and price.

- Tools ranked: 8 · agent-ready (BB or better): 2 · accept x402: 0 · hosted endpoints: 8 · desk reviews by the panel: 16
- JSON: https://www.anchorterminal.com/api/v1/tools.json (list) · https://www.anchorterminal.com/api/v1/rankings.json (ranked) · https://www.anchorterminal.com/api/v1/x402.json (payable) · https://www.anchorterminal.com/api/v1/capabilities.json (by capability)
- Grades run AA, A, BB, B, C, D, E, F · methodology: https://www.anchorterminal.com/benchmark/

- Capabilities in this category: accounting.ledger, accounting.invoices, accounting.bills, accounting.reports, accounting.unified
- https://letme.dev/accounting.ledger picks the top-graded tool in this list and says how to call it direct; calling through letme comes later (https://www.anchorterminal.com/letme/index.md)

## Ranking

| # | Tool | Vendor | Kind | Category | Grade | Score | Confidence | x402 | Auth | Where | Reviews | Page |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 60 | Apideck Accounting API + MCP | Apideck | HTTP API | Accounting | BB | 73.2 | medium | no | API key | hosted + local | 3.5/5 (2) | https://www.anchorterminal.com/tools/apideck-accounting.md |
| 100 | Merge Accounting API | Merge | HTTP API | Accounting | BB | 70.2 | medium | no | API key | hosted | 3.5/5 (2) | https://www.anchorterminal.com/tools/merge-accounting.md |
| 143 | Xero API + MCP | Xero | HTTP API | Accounting | B | 67.4 | medium | no | OAuth | hosted + local | 3.5/5 (2) | https://www.anchorterminal.com/tools/xero.md |
| 291 | FreeAgent API | FreeAgent | HTTP API | Accounting | C | 57.6 | medium | no | OAuth | hosted | 2.5/5 (2) | https://www.anchorterminal.com/tools/freeagent.md |
| 311 | Rutter Accounting API | Rutter | HTTP API | Accounting | C | 55.8 | medium | no | API key | hosted | 3/5 (2) | https://www.anchorterminal.com/tools/rutter.md |
| 342 | Invoice Ninja API | Invoice Ninja | HTTP API | Accounting | D | 52.4 | medium | no | API key | hosted | 2.5/5 (2) | https://www.anchorterminal.com/tools/invoice-ninja.md |
| 369 | QuickBooks Online API + MCP | Intuit | HTTP API | Accounting | D | 49.3 | low | no | OAuth | hosted + local | 2/5 (2) | https://www.anchorterminal.com/tools/quickbooks-online.md |
| 397 | FreshBooks API | FreshBooks | HTTP API | Accounting | E | 45.6 | medium | no | OAuth | hosted | 3/5 (2) | https://www.anchorterminal.com/tools/freshbooks.md |

Scores are from public evidence against the published checklist (https://www.anchorterminal.com/benchmark/), with Performance and Task success pending. p95 latency and context cost come from our probes, which haven't run yet.

## Summaries

### 60. Apideck Accounting API + MCP, BB (73.2)

Unified accounting API for invoices, bills, payments, journal entries and financial reports across platforms including QuickBooks, Xero and NetSuite. 56 accounting connectors, including European ledgers such as DATEV, Exact Online, Fortnox and Twinfield. No published rate limits of Apideck's own, only connector limits mirrored in headers.

- Page: https://www.anchorterminal.com/tools/apideck-accounting · Markdown: https://www.anchorterminal.com/tools/apideck-accounting.md · JSON: https://www.anchorterminal.com/api/v1/tools/apideck-accounting.json
- Capabilities: accounting.unified, accounting.ledger, accounting.invoices, accounting.bills, accounting.reports · endpoint: `https://unify.apideck.com/accounting`

### 100. Merge Accounting API, BB (70.2)

Unified accounting API for invoices, payments, expenses, journal entries and financial statements across platforms including QuickBooks, Xero and NetSuite. 12 accounting platforms behind one set of common models, with writes. Launch jumps from free to $650 a month at the fourth linked account.

- Page: https://www.anchorterminal.com/tools/merge-accounting · Markdown: https://www.anchorterminal.com/tools/merge-accounting.md · JSON: https://www.anchorterminal.com/api/v1/tools/merge-accounting.json
- Capabilities: accounting.unified, accounting.ledger, accounting.invoices, accounting.bills, accounting.reports · endpoint: `https://api.merge.dev/api/accounting/v1`

### 143. Xero API + MCP, B (67.4)

Accounting API for Xero organisations, with contacts, invoices, bills, payments, bank transactions, manual journals, the balance sheet, profit and loss and trial balance, plus payroll in some regions. Granular OAuth scopes, such as accounting.reports.profitandloss.read, required for apps created from 29 April 2026. Developer docs, including the per-minute rate limits, only render with JavaScript.

- Page: https://www.anchorterminal.com/tools/xero · Markdown: https://www.anchorterminal.com/tools/xero.md · JSON: https://www.anchorterminal.com/api/v1/tools/xero.json
- Capabilities: accounting.ledger, accounting.invoices, accounting.bills, accounting.reports · endpoint: `https://api.xero.com/api.xro/2.0`

### 291. FreeAgent API, C (57.6)

REST API for FreeAgent, the UK small-business accounting product owned by NatWest Group. Published limits of 120 requests a minute and 3,600 an hour per user, with Retry-After on 429. No OAuth scopes, so a token can do anything the authorising user can.

- Page: https://www.anchorterminal.com/tools/freeagent · Markdown: https://www.anchorterminal.com/tools/freeagent.md · JSON: https://www.anchorterminal.com/api/v1/tools/freeagent.json
- Capabilities: accounting.ledger, accounting.invoices, accounting.bills, accounting.reports · endpoint: `https://api.freeagent.com/v2`

### 311. Rutter Accounting API, C (55.8)

Unified API for accounting, commerce and payment platforms, aimed at lenders and financial software developers. Idempotency-Key header on writes, and prefer_sync writes that fall back to async after 30 seconds. Production prices are quote-only.

- Page: https://www.anchorterminal.com/tools/rutter · Markdown: https://www.anchorterminal.com/tools/rutter.md · JSON: https://www.anchorterminal.com/api/v1/tools/rutter.json
- Capabilities: accounting.unified, accounting.ledger, accounting.invoices, accounting.bills, accounting.reports · endpoint: `https://production.rutterapi.com/versioned`

### 342. Invoice Ninja API, D (52.4)

Source-available invoicing platform (Laravel) you can self-host or use hosted at invoicing.co. OpenAPI 3 spec with 379 operations and curl and PHP examples on each path. No general ledger, journals or balance sheet, so the bookkeeping half of the category test can't be done.

- Page: https://www.anchorterminal.com/tools/invoice-ninja · Markdown: https://www.anchorterminal.com/tools/invoice-ninja.md · JSON: https://www.anchorterminal.com/api/v1/tools/invoice-ninja.json
- Capabilities: accounting.invoices, accounting.reports · endpoint: `https://invoicing.co/api/v1`

### 369. QuickBooks Online API + MCP, D (49.3)

Intuit's REST API for accessing QuickBooks Online accounting data. Official MCP server from Intuit with 145 tools and flags to remove write, update or delete tools. Rate limits, developer terms, partner tiers and deprecation rules are behind a JavaScript portal that returns nothing to a plain fetch.

- Page: https://www.anchorterminal.com/tools/quickbooks-online · Markdown: https://www.anchorterminal.com/tools/quickbooks-online.md · JSON: https://www.anchorterminal.com/api/v1/tools/quickbooks-online.json
- Capabilities: accounting.ledger, accounting.invoices, accounting.bills, accounting.reports · endpoint: `https://quickbooks.api.intuit.com/v3`

### 397. FreshBooks API, E (45.6)

REST API for FreshBooks, the invoicing-first accounting product for freelancers and small firms. OAuth scopes split read and write per resource, such as user:invoices:read. Rate limits have no numbers, status code or headers.

- Page: https://www.anchorterminal.com/tools/freshbooks · Markdown: https://www.anchorterminal.com/tools/freshbooks.md · JSON: https://www.anchorterminal.com/api/v1/tools/freshbooks.json
- Capabilities: accounting.ledger, accounting.invoices, accounting.bills, accounting.reports · endpoint: `https://api.freshbooks.com`

## How we test this category

An agent creates a customer and an invoice, records a payment, reads a profit and loss report and posts a bill in a sandbox company. We check which steps work, the rate limits and how errors come back. This test hasn't run yet, so Task success is pending and the grades here come from the categories assessed from public evidence.

## Indexed, not reviewed (32)

Sorted into this category from public catalogues, with facts and our own checks but no score, grade or rank (https://www.anchorterminal.com/indexed/index.md).

| Listing | Kind | What it does | Why it's here |
| --- | --- | --- | --- |
| [ai-netcafe](https://www.anchorterminal.com/tools/ainetcafe-ai-netcafe.md) | MCP server | Tables and ledgers checked by arithmetic, not by a model. 24 tools. MCP 2026-07-28 ready. | vendor's own |
| [Attestwire](https://www.anchorterminal.com/tools/attestwire-en16931.md) | MCP server | EN 16931: validate invoice data, UBL/CII or PDF; emit XRechnung/Peppol XML, never a PDF. | vendor's own |
| [basebalance.cloud — x402 RPC & MCP gateway](https://www.anchorterminal.com/tools/basebalance.md) | MCP server | USDC-gated Base JSON-RPC: free 10 req/min, $0.50 per 10k. Failover, cache, /mcp, ledger. | vendor's own, widely used |
| [BeeL](https://www.anchorterminal.com/tools/beel-mcp.md) | MCP server | Spanish e-invoicing with VeriFactu (AEAT): issue invoices, manage customers, validate NIFs. | vendor's own |
| [billingserv.com MCP server](https://www.anchorterminal.com/tools/billingserv-mcp.md) | MCP server | BillingServ MCP server for customers, invoices, orders, packages, licenses, and revenue reports. | vendor's own |
| [burdenrateledger-tools](https://www.anchorterminal.com/tools/burdenrateledger-tools.md) | MCP server | BurdenRateLedger: the monthly US search demand across the tools this product ships, read from... | vendor's own |
| [businys.app MCP server](https://www.anchorterminal.com/tools/businys-mcp-server.md) | MCP server | 221 MCP tools across 26 practices for independent professionals. Clients, invoices, contracts. | vendor's own |
| [cnb](https://www.anchorterminal.com/tools/cz-agents-cnb.md) | MCP server | Official ČNB exchange rates — daily & historical CZK vs EUR, USD, 30+ currencies. For accounting. | vendor's own |
| [Ekwo OS — open source accounting: ledger, invoices and VAT on your own Supabase or Postgres](https://www.anchorterminal.com/tools/ekwo-mcp.md) | MCP server | Double-entry books an agent keeps as the user: invoices, VAT returns, 107 country packs. | vendor's own |
| [Factuarea](https://www.anchorterminal.com/tools/factuarea-mcp.md) | MCP server | Spanish invoicing with VeriFactu (AEAT): invoices, quotes, contacts, products, taxes and filings. | vendor's own |
| [Frihet ERP](https://www.anchorterminal.com/tools/frihet-erp.md) | MCP server | AI-native ERP MCP: ES/EU fiscal compliance (VeriFactu/TicketBAI/Facturae), invoicing, tax, banking | vendor's own |
| [gl-importer-mcp](https://www.anchorterminal.com/tools/synder-gl-importer-mcp.md) | MCP server | Import CSV/XLSX accounting data into QuickBooks Online or Xero via the Synder Importer API. | vendor's own |
| [Holdings](https://www.anchorterminal.com/tools/getholdings-mcp.md) | MCP server | Let your AI send invoices and take payment — card or ACH. Free. | vendor's own |
| [invoice](https://www.anchorterminal.com/tools/yaktool-invoice.md) | MCP server | Check invoice mandatory fields, validate a draft before issuing, and look up EN 16931 code lists. | vendor's own |
| [invoicebox.ru MCP server](https://www.anchorterminal.com/tools/invoicebox-mcp-server.md) | MCP server | MCP-сервер Инвойсбокса: счета, отгрузки и возвраты по просьбе человека | vendor's own |
| [InvoiceXML](https://www.anchorterminal.com/tools/invoicexml.md) | MCP server | Create, validate, convert & extract compliant e-invoices (UBL, Factur-X, ZUGFeRD, XRechnung) | vendor's own |
| [llm-bus](https://www.anchorterminal.com/tools/llm-bus.md) | MCP server | Coordinate multiple AI agents over MCP: atomic claims, leases, shared ledger, handoffs, tasks. | vendor's own |
| [Mandare](https://www.anchorterminal.com/tools/mandarelabs-mandare.md) | MCP server | Verify an agent fleet's tamper-evident ledger, check budgets, kill a runaway agent. Local-first. | vendor's own |
| [market](https://www.anchorterminal.com/tools/sputnikx-market.md) | MCP server | Sputnik X: EU trade 63M+, LV customs, salary, sanctions, EU AI Act, SoulLedger + x402 USDC. | vendor's own |
| [Norman MCP Server](https://www.anchorterminal.com/tools/norman-mcp-server.md) | MCP server | AI-powered bookkeeping and tax filing for entrepreneurs at the heart of the European economy. | vendor's own |
| [parser](https://www.anchorterminal.com/tools/wrapper-agency-parser.md) | MCP server | Parse receipts & invoices into structured JSON. Pay per call in USDC (x402 on Base), no API key. | vendor's own |
| [Particles](https://www.anchorterminal.com/tools/linkedparticles-particles.md) | MCP server | An append-only ledger of sourced, dated, confidence-scored claims your agent cites and you audit | vendor's own |
| [pdfops-mcp](https://www.anchorterminal.com/tools/pdfops-mcp.md) | MCP server | Deterministic PDF tools for AI agents: inspect fields, fill forms, merge PDFs, invoices. | vendor's own |
| [PolyDoc](https://www.anchorterminal.com/tools/polydoc-mcp.md) | MCP server | HTML/URL to PDF, screenshots, e-invoices. PDF/A and PDF/UA output with optional veraPDF verify. | vendor's own |
| [Positif](https://www.anchorterminal.com/tools/positif.md) | MCP server | The agent switchboard: identity, policy, loop-guard, and an append-only audit ledger. | vendor's own |
| [TaskTime Pro](https://www.anchorterminal.com/tools/tasktime-agent-bridge.md) | MCP server | First-party local TaskTime Pro tools for tasks, timers, expenses, invoices, reports, and planning. | vendor's own |
| [The Neural Ledger Intelligence](https://www.anchorterminal.com/tools/theneuralledger-intelligence.md) | MCP server | Read-only global event and evidence intelligence with entities, assets, and impact paths. | vendor's own |
| [Timbrix — CFDI 4.0 para México](https://www.anchorterminal.com/tools/timbrix-mcp.md) | MCP server | Official Timbrix MCP server: stamp, cancel, and query Mexican CFDI 4.0 invoices from AI agents. | vendor's own |
| [US compliance and books health](https://www.anchorterminal.com/tools/medianfi-compliance.md) | MCP server | US company filing obligations, plus a 25-check bookkeeping diagnostic. Sourced, dated, no signup. | vendor's own |
| [wyrd-scribe](https://www.anchorterminal.com/tools/wyrdmcp-wyrd-scribe.md) | MCP server | Creates new pages with provenance and records lineage in a ledger under .wyrd/. | vendor's own |
| [x402receipts](https://www.anchorterminal.com/tools/x402receipts-mcp.md) | MCP server | Record x402 agent purchases as reconciled, auditable receipts; verify any receipt on the ledger. | vendor's own |
| [yaktool](https://www.anchorterminal.com/tools/yaktool.md) | MCP server | 73 local deterministic tools: GTIN, feeds, CSV-XLSX, Digital Link QR, e-invoices. Rules cited. | vendor's own |