{ "data": { "category": { "area": "domain-data", "capabilities": [ "accounting.ledger", "accounting.invoices", "accounting.bills", "accounting.reports", "accounting.unified" ], "description": "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.", "indexed": [ { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/ainetcafe-ai-netcafe.json", "kind": "mcp", "name": "ai-netcafe", "slug": "ainetcafe-ai-netcafe", "url": "https://www.anchorterminal.com/tools/ainetcafe-ai-netcafe" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/attestwire-en16931.json", "kind": "mcp", "name": "Attestwire", "slug": "attestwire-en16931", "url": "https://www.anchorterminal.com/tools/attestwire-en16931" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/basebalance.json", "kind": "mcp", "name": "basebalance.cloud — x402 RPC \u0026 MCP gateway", "slug": "basebalance", "url": "https://www.anchorterminal.com/tools/basebalance" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/beancount.json", "kind": "mcp", "name": "Beancount.io", "slug": "beancount", "url": "https://www.anchorterminal.com/tools/beancount" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/beel-mcp.json", "kind": "mcp", "name": "BeeL", "slug": "beel-mcp", "url": "https://www.anchorterminal.com/tools/beel-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/billingserv-mcp.json", "kind": "mcp", "name": "billingserv.com MCP server", "slug": "billingserv-mcp", "url": "https://www.anchorterminal.com/tools/billingserv-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/burdenrateledger-tools.json", "kind": "mcp", "name": "burdenrateledger-tools", "slug": "burdenrateledger-tools", "url": "https://www.anchorterminal.com/tools/burdenrateledger-tools" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/businys-mcp-server.json", "kind": "mcp", "name": "businys.app MCP server", "slug": "businys-mcp-server", "url": "https://www.anchorterminal.com/tools/businys-mcp-server" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/cz-agents-cnb.json", "kind": "mcp", "name": "cnb", "slug": "cz-agents-cnb", "url": "https://www.anchorterminal.com/tools/cz-agents-cnb" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/ekwo-mcp.json", "kind": "mcp", "name": "Ekwo OS — open source accounting: ledger, invoices and VAT on your own Supabase or Postgres", "slug": "ekwo-mcp", "url": "https://www.anchorterminal.com/tools/ekwo-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/factuarea-mcp.json", "kind": "mcp", "name": "Factuarea", "slug": "factuarea-mcp", "url": "https://www.anchorterminal.com/tools/factuarea-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/frihet-erp.json", "kind": "mcp", "name": "Frihet ERP", "slug": "frihet-erp", "url": "https://www.anchorterminal.com/tools/frihet-erp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/synder-gl-importer-mcp.json", "kind": "mcp", "name": "gl-importer-mcp", "slug": "synder-gl-importer-mcp", "url": "https://www.anchorterminal.com/tools/synder-gl-importer-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/1102tools-gsa-perdiem-mcp.json", "kind": "mcp", "name": "GSA Per Diem", "slug": "1102tools-gsa-perdiem-mcp", "url": "https://www.anchorterminal.com/tools/1102tools-gsa-perdiem-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/getholdings-mcp.json", "kind": "mcp", "name": "Holdings", "slug": "getholdings-mcp", "url": "https://www.anchorterminal.com/tools/getholdings-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/yaktool-invoice.json", "kind": "mcp", "name": "invoice", "slug": "yaktool-invoice", "url": "https://www.anchorterminal.com/tools/yaktool-invoice" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/invoicebox-mcp-server.json", "kind": "mcp", "name": "invoicebox.ru MCP server", "slug": "invoicebox-mcp-server", "url": "https://www.anchorterminal.com/tools/invoicebox-mcp-server" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/invoicexml.json", "kind": "mcp", "name": "InvoiceXML", "slug": "invoicexml", "url": "https://www.anchorterminal.com/tools/invoicexml" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/obolpay-jp-verify.json", "kind": "mcp", "name": "JP-Verify", "slug": "obolpay-jp-verify", "url": "https://www.anchorterminal.com/tools/obolpay-jp-verify" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/llm-bus.json", "kind": "mcp", "name": "llm-bus", "slug": "llm-bus", "url": "https://www.anchorterminal.com/tools/llm-bus" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mandarelabs-mandare.json", "kind": "mcp", "name": "Mandare", "slug": "mandarelabs-mandare", "url": "https://www.anchorterminal.com/tools/mandarelabs-mandare" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/norman-mcp-server.json", "kind": "mcp", "name": "Norman MCP Server", "slug": "norman-mcp-server", "url": "https://www.anchorterminal.com/tools/norman-mcp-server" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/wrapper-agency-parser.json", "kind": "mcp", "name": "parser", "slug": "wrapper-agency-parser", "url": "https://www.anchorterminal.com/tools/wrapper-agency-parser" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/linkedparticles-particles.json", "kind": "mcp", "name": "Particles", "slug": "linkedparticles-particles", "url": "https://www.anchorterminal.com/tools/linkedparticles-particles" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/pdfops-mcp.json", "kind": "mcp", "name": "pdfops-mcp", "slug": "pdfops-mcp", "url": "https://www.anchorterminal.com/tools/pdfops-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/polydoc-mcp.json", "kind": "mcp", "name": "PolyDoc", "slug": "polydoc-mcp", "url": "https://www.anchorterminal.com/tools/polydoc-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/positif.json", "kind": "mcp", "name": "Positif", "slug": "positif", "url": "https://www.anchorterminal.com/tools/positif" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/tasktime-agent-bridge.json", "kind": "mcp", "name": "TaskTime Pro", "slug": "tasktime-agent-bridge", "url": "https://www.anchorterminal.com/tools/tasktime-agent-bridge" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/theneuralledger-intelligence.json", "kind": "mcp", "name": "The Neural Ledger Intelligence", "slug": "theneuralledger-intelligence", "url": "https://www.anchorterminal.com/tools/theneuralledger-intelligence" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/timbrix-mcp.json", "kind": "mcp", "name": "Timbrix — CFDI 4.0 para México", "slug": "timbrix-mcp", "url": "https://www.anchorterminal.com/tools/timbrix-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/medianfi-compliance.json", "kind": "mcp", "name": "US compliance and books health", "slug": "medianfi-compliance", "url": "https://www.anchorterminal.com/tools/medianfi-compliance" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/wyrdmcp-wyrd-scribe.json", "kind": "mcp", "name": "wyrd-scribe", "slug": "wyrdmcp-wyrd-scribe", "url": "https://www.anchorterminal.com/tools/wyrdmcp-wyrd-scribe" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/x402receipts-mcp.json", "kind": "mcp", "name": "x402receipts", "slug": "x402receipts-mcp", "url": "https://www.anchorterminal.com/tools/x402receipts-mcp" }, { "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/yaktool.json", "kind": "mcp", "name": "yaktool", "slug": "yaktool", "url": "https://www.anchorterminal.com/tools/yaktool" } ], "indexedCount": 34, "json": "https://www.anchorterminal.com/categories/accounting.json", "name": "Accounting \u0026 invoicing", "slug": "accounting", "test": "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.", "title": "Accounting and invoicing APIs for AI agents", "toolCount": 12, "tools": [ "apideck-accounting", "merge-accounting", "xero", "pennylane", "codat", "zoho-books", "freeagent", "odoo", "rutter", "invoice-ninja", "quickbooks-online", "freshbooks" ], "url": "https://www.anchorterminal.com/categories/accounting" }, "faq": [ { "answer": "Apideck Accounting API + MCP has the highest benchmark score of the 12 ranked accounting and invoicing APIs, 72.9 (BB). Merge Accounting API is second with 70 (BB).", "question": "What are the highest-rated accounting and invoicing APIs for AI agents?" }, { "answer": "2 of the 12 ranked here grade BB or better, the bar for agent-ready on the Anchor benchmark.", "question": "How many accounting and invoicing APIs are agent-ready?" }, { "answer": "None of the ranked listings here accepts x402 for its main call yet.", "question": "Which accounting and invoicing APIs accept x402 payments?" }, { "answer": "By the Anchor benchmark score out of 100, a weighted mean of the scored categories minus deductions for negative events, from public evidence re-checked as vendors change. Listings cannot pay for a place. The latest assessment behind this page is from 9 October 2026.", "question": "How is this list ranked?" } ], "howToChoose": [ { "label": "Objects covered and write access", "detail": "Check which objects can be read and which can be written, since a bill or payment you cannot post leaves the agent able to report but not to record." }, { "label": "Direct or unified connection", "detail": "Check whether the API connects to the accounting package your client uses or goes through a unified layer, since coverage and access can differ between the two." }, { "label": "Rate limits and error handling", "detail": "Check the rate limits and how errors come back, including retry guidance and idempotency, since a sync that retries a failed invoice can create duplicates in the ledger." }, { "label": "Sandbox and report access", "detail": "Confirm a sandbox company can run the full flow and that reports are readable, since an agent should test invoices and bills before real books change." } ], "picks": [ { "also": { "name": "Merge Accounting API", "slug": "merge-accounting", "why": "BB, 70/100" }, "name": "Apideck Accounting API + MCP", "need": "Highest score overall", "slug": "apideck-accounting", "why": "BB, 72.9/100 on the benchmark" }, { "name": "FreeAgent API", "need": "Reliability", "slug": "freeagent", "why": "85/100 on reliability, against 75 for the overall leader" }, { "name": "Pennylane", "need": "Security \u0026 auth", "slug": "pennylane", "why": "68/100 on security \u0026 auth, against 66 for the overall leader" }, { "name": "QuickBooks Online API + MCP", "need": "Maintenance \u0026 community", "slug": "quickbooks-online", "why": "85/100 on maintenance \u0026 community, against 80 for the overall leader" }, { "name": "Odoo External API", "need": "Transparency \u0026 trust", "slug": "odoo", "why": "93/100 on transparency \u0026 trust, against 73 for the overall leader" }, { "also": { "name": "Invoice Ninja API", "slug": "invoice-ninja", "why": "self-hosted, Elastic License 2 licence" }, "name": "Odoo External API", "need": "Self-hosting under an open licence", "slug": "odoo", "why": "self-hosted, Community edition LGPL-3 licence" } ], "ranked": 12, "shortlist": [ { "bestFor": "A SaaS product that has to reach many customers' ledgers, especially European or desktop ones, through one agent-friendly MCP.", "grade": "BB", "name": "Apideck Accounting API + MCP", "position": 1, "price": "$599 / mo", "score": 72.9, "slug": "apideck-accounting", "strengths": [ "56 accounting connectors, including European ledgers such as DATEV, Exact Online, Fortnox and Twinfield", "Dynamic MCP mode with 4 meta-tools at about 1,300 tokens, and annotations on all 362 tools", "Public OpenAPI spec (accounting.yml, 208 operations) with a dated changelog and a BREAKING.md for removals" ], "url": "https://www.anchorterminal.com/tools/apideck-accounting", "verdict": "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.", "weaknesses": [ "No published rate limits of Apideck's own, only connector limits mirrored in headers", "No idempotency keys on writes, so a timed-out create can duplicate", "$599 a month for 25 customers after the trial, no free tier" ], "where": "both", "x402": "no" }, { "bestFor": "A SaaS product that reads and writes many customers' ledgers through one model and wants docs an agent can read cheaply.", "grade": "BB", "name": "Merge Accounting API", "position": 2, "price": "$650 / mo", "score": 70, "slug": "merge-accounting", "strengths": [ "12 accounting platforms behind one set of common models, with writes", "Three production linked accounts free with no card", "llms.txt, Markdown twins of every docs page and a JSON OpenAPI spec" ], "url": "https://www.anchorterminal.com/tools/merge-accounting", "verdict": "12 accounting platforms behind one set of common models, with writes. Launch jumps from free to $650 a month at the fourth linked account.", "weaknesses": [ "Launch jumps from free to $650 a month at the fourth linked account", "No documented 429 handling, idempotency keys or safe-retry guidance for writes", "Merge's own MCP server for the Unified API has been idle since 0.1.4 in April 2025" ], "where": "hosted", "x402": "no" }, { "bestFor": "An agent keeping the books for UK, Australian or New Zealand businesses, or any team that wants read-only scopes and long deprecation notice.", "grade": "B", "name": "Xero API + MCP", "position": 3, "price": "Freemium", "score": 67.2, "slug": "xero", "strengths": [ "Granular OAuth scopes, such as accounting.reports.profitandloss.read, required for apps created from 29 April 2026", "Deprecations announced with 12 to 13 months' notice on a dated changelog", "Public OpenAPI specs, with an Idempotency-Key parameter on 101 accounting operations" ], "url": "https://www.anchorterminal.com/tools/xero", "verdict": "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.", "weaknesses": [ "Developer docs, including the per-minute rate limits, only render with JavaScript", "1,000 calls a day per organisation on the free tier, 5,000 on paid", "Official MCP server idle since 5 June 2026, with no CI, no annotations and no registry entry" ], "where": "both", "x402": "no" }, { "bestFor": "An agent working on the books of French companies or an accounting firm's client portfolio, with French chart of accounts, FEC export, Factur-X e-invoicing and VAT returns.", "grade": "B", "name": "Pennylane", "position": 4, "price": "Paid", "score": 66.3, "slug": "pennylane", "strengths": [ "Scopes split each resource into `:readonly` and `:all`, for company tokens, firm tokens and OAuth apps", "Hosted MCP server at `https://mcp.pennylane.com/mcp` with 31 read-only tools, OAuth 2.1 with PKCE and dynamic client registration", "OpenAPI 3.0.1 definitions on each reference page, an llms.txt index and Markdown twins of every docs page" ], "url": "https://www.anchorterminal.com/tools/pennylane", "verdict": "The v2 API has per-resource read and write scopes, an OpenAPI definition on every reference page, llms.txt and a breaking-change process that ran over 24 weeks. Access needs a paid Essentiel plan or partner approval, creation endpoints are not idempotent, and the API agreement lets Pennylane change or revoke the API without notice.", "weaknesses": [ "The API agreement allows changes, suspension or revocation with or without notice and supplies the API as is", "Creation endpoints do not enforce idempotency, except supplier invoice imports", "API and MCP access for companies starts at the Essentiel plan, and OAuth apps need approval from the Partnerships team" ], "where": "hosted", "x402": "no" }, { "bestFor": "Banks, lenders, bill pay, expense and card products that already have or will sign a Codat contract and need writes into many accounting packages.", "grade": "B", "name": "Codat", "position": 5, "price": "Paid", "score": 64.3, "slug": "codat", "strengths": [ "Public OpenAPI 3 specs for every API in codatio/oas, with long operation descriptions and per-integration response examples", "Idempotency-Key header on POST and PATCH, cached for 90 minutes, and released after a 429 so the same key can be retried", "429 responses carry Retry-After, and every response carries X-Rate-Limit-Limit, Remaining and Reset headers" ], "url": "https://www.anchorterminal.com/tools/codat", "verdict": "Public OpenAPI specs, an Idempotency-Key header on writes, Retry-After on 429 and a written three-month deprecation notice suit an agent that retries. Access is the limitation. No price or self-serve signup is published, the general Accounting API is closed to new clients, and API keys carry no scopes.", "weaknesses": [ "No public price. The pricing page returns 404 and fees are set in an order form", "No self-serve signup found. The docs and the site ask new users to get in touch", "The general Accounting API spec says it is relevant only to existing clients, and the status page labels it Legacy" ], "where": "hosted", "x402": "no" }, { "bestFor": "Small businesses already on Zoho that want an agent to raise invoices, record bills and payments, reconcile bank transactions and post journals with narrow scopes.", "grade": "C", "name": "Zoho Books", "position": 6, "price": "$15 / mo", "score": 61.1, "slug": "zoho-books", "strengths": [ "OpenAPI 3.0.0 files for 45 resources and 885 operations download from the docs as `openapi-all.zip`", "OAuth scopes narrow to one module and one operation, such as `ZohoBooks.invoices.READ`", "Every API reference operation has a Markdown twin, such as `/books/api/v3/invoices/create-an-invoice.md`" ], "url": "https://www.anchorterminal.com/tools/zoho-books", "verdict": "The public OpenAPI files cover 885 operations with OAuth scopes per module and operation, and the Free plan allows 1,000 API requests a day. No report endpoint, official SDK, SLA or dated API changelog was found, and the documented token calls put the client secret in the URL.", "weaknesses": [ "No profit and loss, balance sheet or other report endpoint appears in the API docs or the OpenAPI files", "The documented token and refresh calls put the client secret and refresh token in the URL query string", "Daily caps are low, 1,000 requests on Free and 10,000 on the top three plans" ], "where": "hosted", "x402": "no" }, { "bestFor": "An agent doing the books for a UK freelancer or small limited company, especially one already banking with NatWest.", "grade": "C", "name": "FreeAgent API", "position": 7, "price": "Your plan", "score": 57.2, "slug": "freeagent", "strengths": [ "Published limits of 120 requests a minute and 3,600 an hour per user, with Retry-After on 429", "X-RateLimit-Test header that lowers the sandbox to 5 requests a minute for testing back-off", "API free under section 4.1 of the terms, with 30 days' notice before any fee" ], "url": "https://www.anchorterminal.com/tools/freeagent", "verdict": "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.", "weaknesses": [ "No OAuth scopes, so a token can do anything the authorising user can", "No OpenAPI spec, SDK, llms.txt or official MCP server", "Error responses aren't documented beyond the 429" ], "where": "hosted", "x402": "no" }, { "bestFor": "An agent working inside a company that already runs Odoo, where invoices, bills, journal entries, stock and sales sit in one database behind one endpoint pattern.", "grade": "C", "name": "Odoo External API", "position": 8, "price": "Paid", "score": 55.9, "slug": "odoo", "strengths": [ "`/json/2/\u003cmodel\u003e/\u003cmethod\u003e` reaches every model the user can see, including `account.move` for invoices, bills and journal entries", "API keys are per user, shown once, expire within three months at most and can be generated and revoked through the API", "Odoo 20 adds an MCP server at `\u003cdatabase_url\u003e/mcp` that exposes five read-only tools by default, with write tools switched on one by one" ], "url": "https://www.anchorterminal.com/tools/odoo", "verdict": "One endpoint pattern reaches every model, with field selection, filters and paging, and keys that expire within three months. On Odoo Online the external API needs the Custom plan, there is no OpenAPI file, and the acceptable use policy asks for about one call a second with no parallel calls.", "weaknesses": [ "On Odoo Online the external API is limited to the Custom plan. One App Free and Standard exclude it", "No OpenAPI file and no llms.txt. The per-database reference at `/doc` needs a login or a key, and its docs section reads \"Under construction\"", "The acceptable use policy puts API traffic at about one call a second with no parallel calls. No 429 or Retry-After handling was found in the docs" ], "where": "local", "x402": "no" }, { "bestFor": "Lenders, spend-management and fintech products that read ledgers alongside commerce and payment platforms, and that need writes an agent can retry safely.", "grade": "C", "name": "Rutter Accounting API", "position": 9, "price": "Paid", "score": 55.6, "slug": "rutter", "strengths": [ "Idempotency-Key header on writes, and prefer_sync writes that fall back to async after 30 seconds", "Error codes 450, 451, 452 and 550 that separate the platform's failure from Rutter's", "OpenAPI spec per dated API version, with an upgrade guide listing breaking changes" ], "url": "https://www.anchorterminal.com/tools/rutter", "verdict": "Idempotency-Key header on writes, and prefer_sync writes that fall back to async after 30 seconds. Production prices are quote-only.", "weaknesses": [ "Production prices are quote-only", "Terms and privacy policy are Google Drive PDFs, and no legal entity is named on the site", "The per-connection access_token travels as a URL query parameter" ], "where": "hosted", "x402": "no" }, { "bestFor": "An agent that quotes, invoices, chases and records payments for a small business, or for anyone who wants the billing system on their own server.", "grade": "D", "name": "Invoice Ninja API", "position": 10, "price": "$14 / mo", "score": 52.1, "slug": "invoice-ninja", "strengths": [ "OpenAPI 3 spec with 379 operations and curl and PHP examples on each path", "Public demo endpoint with the token TOKEN, no account needed", "Self-hosting is free with every Pro and Enterprise feature" ], "url": "https://www.anchorterminal.com/tools/invoice-ninja", "verdict": "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.", "weaknesses": [ "No general ledger, journals or balance sheet, so the bookkeeping half of the category test can't be done", "Rate limits aren't in the docs, only in the source", "Status page shows seven days and has no history page" ], "where": "hosted", "x402": "no" } ], "updated": "2026-10-09" }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/best/accounting/", "json": "https://www.anchorterminal.com/best/accounting/index.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/best/accounting/index.md", "slim": "https://www.anchorterminal.com/best/accounting/index.min.md" }, "markdown": "The 10 highest-scoring of 12 accounting and invoicing APIs on the Anchor benchmark, with a pick for each need and where each one falls short. Scores come from public evidence, re-checked as vendors change.\n\n- Ranked: 12 · agent-ready (BB or better): 2 · accept x402: 0 · hosted endpoints: 11\n- Full ranked table: https://www.anchorterminal.com/categories/accounting.md\n- Head-to-head comparisons: https://www.anchorterminal.com/compare/accounting/index.md (66)\n- Methodology: https://www.anchorterminal.com/benchmark/index.md\n\n## The shortlist\n\n| # | Tool | Grade | Score | Best for | Price | Where |\n| --- | --- | --- | --- | --- | --- | --- |\n| 1 | [Apideck Accounting API + MCP](https://www.anchorterminal.com/tools/apideck-accounting.md) | BB | 72.9 | A SaaS product that has to reach many customers' ledgers, especially European or desktop ones, through one agent-friendly MCP. | $599 / mo | hosted and local |\n| 2 | [Merge Accounting API](https://www.anchorterminal.com/tools/merge-accounting.md) | BB | 70 | A SaaS product that reads and writes many customers' ledgers through one model and wants docs an agent can read cheaply. | $650 / mo | hosted |\n| 3 | [Xero API + MCP](https://www.anchorterminal.com/tools/xero.md) | B | 67.2 | An agent keeping the books for UK, Australian or New Zealand businesses, or any team that wants read-only scopes and long deprecation notice. | Freemium | hosted and local |\n| 4 | [Pennylane](https://www.anchorterminal.com/tools/pennylane.md) | B | 66.3 | An agent working on the books of French companies or an accounting firm's client portfolio, with French chart of accounts, FEC export, Factur-X e-invoicing and VAT returns. | Paid | hosted |\n| 5 | [Codat](https://www.anchorterminal.com/tools/codat.md) | B | 64.3 | Banks, lenders, bill pay, expense and card products that already have or will sign a Codat contract and need writes into many accounting packages. | Paid | hosted |\n| 6 | [Zoho Books](https://www.anchorterminal.com/tools/zoho-books.md) | C | 61.1 | Small businesses already on Zoho that want an agent to raise invoices, record bills and payments, reconcile bank transactions and post journals with narrow scopes. | $15 / mo | hosted |\n| 7 | [FreeAgent API](https://www.anchorterminal.com/tools/freeagent.md) | C | 57.2 | An agent doing the books for a UK freelancer or small limited company, especially one already banking with NatWest. | Your plan | hosted |\n| 8 | [Odoo External API](https://www.anchorterminal.com/tools/odoo.md) | C | 55.9 | An agent working inside a company that already runs Odoo, where invoices, bills, journal entries, stock and sales sit in one database behind one endpoint pattern. | Paid | local |\n| 9 | [Rutter Accounting API](https://www.anchorterminal.com/tools/rutter.md) | C | 55.6 | Lenders, spend-management and fintech products that read ledgers alongside commerce and payment platforms, and that need writes an agent can retry safely. | Paid | hosted |\n| 10 | [Invoice Ninja API](https://www.anchorterminal.com/tools/invoice-ninja.md) | D | 52.1 | An agent that quotes, invoices, chases and records payments for a small business, or for anyone who wants the billing system on their own server. | $14 / mo | hosted |\n\n## Picks by need\n\n- Highest score overall: [Apideck Accounting API + MCP](https://www.anchorterminal.com/tools/apideck-accounting.md), BB, 72.9/100 on the benchmark. Also [Merge Accounting API](https://www.anchorterminal.com/tools/merge-accounting.md), BB, 70/100.\n- Reliability: [FreeAgent API](https://www.anchorterminal.com/tools/freeagent.md), 85/100 on reliability, against 75 for the overall leader.\n- Security \u0026 auth: [Pennylane](https://www.anchorterminal.com/tools/pennylane.md), 68/100 on security \u0026 auth, against 66 for the overall leader.\n- Maintenance \u0026 community: [QuickBooks Online API + MCP](https://www.anchorterminal.com/tools/quickbooks-online.md), 85/100 on maintenance \u0026 community, against 80 for the overall leader.\n- Transparency \u0026 trust: [Odoo External API](https://www.anchorterminal.com/tools/odoo.md), 93/100 on transparency \u0026 trust, against 73 for the overall leader.\n- Self-hosting under an open licence: [Odoo External API](https://www.anchorterminal.com/tools/odoo.md), self-hosted, Community edition LGPL-3 licence. Also [Invoice Ninja API](https://www.anchorterminal.com/tools/invoice-ninja.md), self-hosted, Elastic License 2 licence.\n\n## How to choose\n\n- Objects covered and write access: Check which objects can be read and which can be written, since a bill or payment you cannot post leaves the agent able to report but not to record.\n- Direct or unified connection: Check whether the API connects to the accounting package your client uses or goes through a unified layer, since coverage and access can differ between the two.\n- Rate limits and error handling: Check the rate limits and how errors come back, including retry guidance and idempotency, since a sync that retries a failed invoice can create duplicates in the ledger.\n- Sandbox and report access: Confirm a sandbox company can run the full flow and that reports are readable, since an agent should test invoices and bills before real books change.\n\n- How the benchmark tests 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.\n\n## Each one in detail\n\n### 1. Apideck Accounting API + MCP, BB 72.9/100\n\nUnified accounting API for invoices, bills, payments, journal entries and financial reports across platforms including QuickBooks, Xero and NetSuite.\n\n- Verdict: 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.\n- Choose it for: A SaaS product that has to reach many customers' ledgers, especially European or desktop ones, through one agent-friendly MCP.\n- Strength: 56 accounting connectors, including European ledgers such as DATEV, Exact Online, Fortnox and Twinfield\n- Strength: Dynamic MCP mode with 4 meta-tools at about 1,300 tokens, and annotations on all 362 tools\n- Strength: Public OpenAPI spec (accounting.yml, 208 operations) with a dated changelog and a BREAKING.md for removals\n- Weakness: No published rate limits of Apideck's own, only connector limits mirrored in headers\n- Weakness: No idempotency keys on writes, so a timed-out create can duplicate\n- Weakness: $599 a month for 25 customers after the trial, no free tier\n- Price: $599 / mo · Auth: API key · x402: no · Where: hosted and local\n- Full assessment: https://www.anchorterminal.com/tools/apideck-accounting.md\n\n### 2. Merge Accounting API, BB 70/100\n\nUnified accounting API for invoices, payments, expenses, journal entries and financial statements across platforms including QuickBooks, Xero and NetSuite.\n\n- Verdict: 12 accounting platforms behind one set of common models, with writes. Launch jumps from free to $650 a month at the fourth linked account.\n- Choose it for: A SaaS product that reads and writes many customers' ledgers through one model and wants docs an agent can read cheaply.\n- Strength: 12 accounting platforms behind one set of common models, with writes\n- Strength: Three production linked accounts free with no card\n- Strength: llms.txt, Markdown twins of every docs page and a JSON OpenAPI spec\n- Weakness: Launch jumps from free to $650 a month at the fourth linked account\n- Weakness: No documented 429 handling, idempotency keys or safe-retry guidance for writes\n- Weakness: Merge's own MCP server for the Unified API has been idle since 0.1.4 in April 2025\n- Price: $650 / mo · Auth: API key · x402: no · Where: hosted\n- Full assessment: https://www.anchorterminal.com/tools/merge-accounting.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-merge-accounting.md\n\n### 3. Xero API + MCP, B 67.2/100\n\nAccounting 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.\n\n- Verdict: 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.\n- Choose it for: An agent keeping the books for UK, Australian or New Zealand businesses, or any team that wants read-only scopes and long deprecation notice.\n- Strength: Granular OAuth scopes, such as accounting.reports.profitandloss.read, required for apps created from 29 April 2026\n- Strength: Deprecations announced with 12 to 13 months' notice on a dated changelog\n- Strength: Public OpenAPI specs, with an Idempotency-Key parameter on 101 accounting operations\n- Weakness: Developer docs, including the per-minute rate limits, only render with JavaScript\n- Weakness: 1,000 calls a day per organisation on the free tier, 5,000 on paid\n- Weakness: Official MCP server idle since 5 June 2026, with no CI, no annotations and no registry entry\n- Price: Freemium · Auth: OAuth · x402: no · Where: hosted and local\n- Full assessment: https://www.anchorterminal.com/tools/xero.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-xero.md\n\n### 4. Pennylane, B 66.3/100\n\nPennylane is a French accounting and invoicing platform for companies and accounting firms. Its Company and Firm REST APIs cover invoices, supplier invoices, ledger entries, transactions and exports. A hosted read-only MCP server exposes the same books to AI assistants.\n\n- Verdict: The v2 API has per-resource read and write scopes, an OpenAPI definition on every reference page, llms.txt and a breaking-change process that ran over 24 weeks. Access needs a paid Essentiel plan or partner approval, creation endpoints are not idempotent, and the API agreement lets Pennylane change or revoke the API without notice.\n- Choose it for: An agent working on the books of French companies or an accounting firm's client portfolio, with French chart of accounts, FEC export, Factur-X e-invoicing and VAT returns.\n- Strength: Scopes split each resource into `:readonly` and `:all`, for company tokens, firm tokens and OAuth apps\n- Strength: Hosted MCP server at `https://mcp.pennylane.com/mcp` with 31 read-only tools, OAuth 2.1 with PKCE and dynamic client registration\n- Strength: OpenAPI 3.0.1 definitions on each reference page, an llms.txt index and Markdown twins of every docs page\n- Weakness: The API agreement allows changes, suspension or revocation with or without notice and supplies the API as is\n- Weakness: Creation endpoints do not enforce idempotency, except supplier invoice imports\n- Weakness: API and MCP access for companies starts at the Essentiel plan, and OAuth apps need approval from the Partnerships team\n- Price: Paid · Auth: OAuth or key · x402: no · Where: hosted\n- Full assessment: https://www.anchorterminal.com/tools/pennylane.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-pennylane.md\n\n### 5. Codat, B 64.3/100\n\nCodat connects a business's accounting, banking and commerce software to financial products and banks through one REST API. Product APIs cover bill pay, expenses, bank feeds and lending data, with official SDKs for TypeScript, Python and C#.\n\n- Verdict: Public OpenAPI specs, an Idempotency-Key header on writes, Retry-After on 429 and a written three-month deprecation notice suit an agent that retries. Access is the limitation. No price or self-serve signup is published, the general Accounting API is closed to new clients, and API keys carry no scopes.\n- Choose it for: Banks, lenders, bill pay, expense and card products that already have or will sign a Codat contract and need writes into many accounting packages.\n- Strength: Public OpenAPI 3 specs for every API in codatio/oas, with long operation descriptions and per-integration response examples\n- Strength: Idempotency-Key header on POST and PATCH, cached for 90 minutes, and released after a 429 so the same key can be retried\n- Strength: 429 responses carry Retry-After, and every response carries X-Rate-Limit-Limit, Remaining and Reset headers\n- Weakness: No public price. The pricing page returns 404 and fees are set in an order form\n- Weakness: No self-serve signup found. The docs and the site ask new users to get in touch\n- Weakness: The general Accounting API spec says it is relevant only to existing clients, and the status page labels it Legacy\n- Price: Paid · Auth: API key · x402: no · Where: hosted\n- Full assessment: https://www.anchorterminal.com/tools/codat.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-codat.md\n\n### 6. Zoho Books, C 61.1/100\n\nZoho Books is hosted accounting software from Zoho for small and mid-sized businesses. Agents reach it through the REST API v3, covering invoices, bills, payments, banking, journals and the chart of accounts behind OAuth 2.0.\n\n- Verdict: The public OpenAPI files cover 885 operations with OAuth scopes per module and operation, and the Free plan allows 1,000 API requests a day. No report endpoint, official SDK, SLA or dated API changelog was found, and the documented token calls put the client secret in the URL.\n- Choose it for: Small businesses already on Zoho that want an agent to raise invoices, record bills and payments, reconcile bank transactions and post journals with narrow scopes.\n- Strength: OpenAPI 3.0.0 files for 45 resources and 885 operations download from the docs as `openapi-all.zip`\n- Strength: OAuth scopes narrow to one module and one operation, such as `ZohoBooks.invoices.READ`\n- Strength: Every API reference operation has a Markdown twin, such as `/books/api/v3/invoices/create-an-invoice.md`\n- Weakness: No profit and loss, balance sheet or other report endpoint appears in the API docs or the OpenAPI files\n- Weakness: The documented token and refresh calls put the client secret and refresh token in the URL query string\n- Weakness: Daily caps are low, 1,000 requests on Free and 10,000 on the top three plans\n- Price: $15 / mo · Auth: OAuth · x402: no · Where: hosted\n- Full assessment: https://www.anchorterminal.com/tools/zoho-books.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-zoho-books.md\n\n### 7. FreeAgent API, C 57.2/100\n\nREST API for FreeAgent, the UK small-business accounting product owned by NatWest Group.\n\n- Verdict: 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.\n- Choose it for: An agent doing the books for a UK freelancer or small limited company, especially one already banking with NatWest.\n- Strength: Published limits of 120 requests a minute and 3,600 an hour per user, with Retry-After on 429\n- Strength: X-RateLimit-Test header that lowers the sandbox to 5 requests a minute for testing back-off\n- Strength: API free under section 4.1 of the terms, with 30 days' notice before any fee\n- Weakness: No OAuth scopes, so a token can do anything the authorising user can\n- Weakness: No OpenAPI spec, SDK, llms.txt or official MCP server\n- Weakness: Error responses aren't documented beyond the 429\n- Price: Your plan · Auth: OAuth · x402: no · Where: hosted\n- Full assessment: https://www.anchorterminal.com/tools/freeagent.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-freeagent.md\n\n### 8. Odoo External API, C 55.9/100\n\nOdoo is a business suite from Odoo SA in Belgium with accounting, invoicing, sales, stock and HR apps on one database. Outside software reaches it through the JSON-2 HTTP API with API keys and, from Odoo 20, an MCP server.\n\n- Verdict: One endpoint pattern reaches every model, with field selection, filters and paging, and keys that expire within three months. On Odoo Online the external API needs the Custom plan, there is no OpenAPI file, and the acceptable use policy asks for about one call a second with no parallel calls.\n- Choose it for: An agent working inside a company that already runs Odoo, where invoices, bills, journal entries, stock and sales sit in one database behind one endpoint pattern.\n- Strength: `/json/2/\u003cmodel\u003e/\u003cmethod\u003e` reaches every model the user can see, including `account.move` for invoices, bills and journal entries\n- Strength: API keys are per user, shown once, expire within three months at most and can be generated and revoked through the API\n- Strength: Odoo 20 adds an MCP server at `\u003cdatabase_url\u003e/mcp` that exposes five read-only tools by default, with write tools switched on one by one\n- Weakness: On Odoo Online the external API is limited to the Custom plan. One App Free and Standard exclude it\n- Weakness: No OpenAPI file and no llms.txt. The per-database reference at `/doc` needs a login or a key, and its docs section reads \"Under construction\"\n- Weakness: The acceptable use policy puts API traffic at about one call a second with no parallel calls. No 429 or Retry-After handling was found in the docs\n- Price: Paid · Auth: API key · x402: no · Where: local\n- Full assessment: https://www.anchorterminal.com/tools/odoo.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-odoo.md\n\n### 9. Rutter Accounting API, C 55.6/100\n\nUnified API for accounting, commerce and payment platforms, aimed at lenders and financial software developers.\n\n- Verdict: Idempotency-Key header on writes, and prefer_sync writes that fall back to async after 30 seconds. Production prices are quote-only.\n- Choose it for: Lenders, spend-management and fintech products that read ledgers alongside commerce and payment platforms, and that need writes an agent can retry safely.\n- Strength: Idempotency-Key header on writes, and prefer_sync writes that fall back to async after 30 seconds\n- Strength: Error codes 450, 451, 452 and 550 that separate the platform's failure from Rutter's\n- Strength: OpenAPI spec per dated API version, with an upgrade guide listing breaking changes\n- Weakness: Production prices are quote-only\n- Weakness: Terms and privacy policy are Google Drive PDFs, and no legal entity is named on the site\n- Weakness: The per-connection access_token travels as a URL query parameter\n- Price: Paid · Auth: API key · x402: no · Where: hosted\n- Full assessment: https://www.anchorterminal.com/tools/rutter.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-rutter.md\n\n### 10. Invoice Ninja API, D 52.1/100\n\nSource-available invoicing platform (Laravel) you can self-host or use hosted at invoicing.co.\n\n- Verdict: 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.\n- Choose it for: An agent that quotes, invoices, chases and records payments for a small business, or for anyone who wants the billing system on their own server.\n- Strength: OpenAPI 3 spec with 379 operations and curl and PHP examples on each path\n- Strength: Public demo endpoint with the token TOKEN, no account needed\n- Strength: Self-hosting is free with every Pro and Enterprise feature\n- Weakness: No general ledger, journals or balance sheet, so the bookkeeping half of the category test can't be done\n- Weakness: Rate limits aren't in the docs, only in the source\n- Weakness: Status page shows seven days and has no history page\n- Price: $14 / mo · Auth: API key · x402: no · Where: hosted\n- Full assessment: https://www.anchorterminal.com/tools/invoice-ninja.md\n- Against #1: https://www.anchorterminal.com/compare/apideck-accounting-vs-invoice-ninja.md\n\n2 more are ranked in the full table: https://www.anchorterminal.com/categories/accounting.md\n\n## Head to head\n\n- [Apideck Accounting API + MCP vs Merge Accounting API](https://www.anchorterminal.com/compare/apideck-accounting-vs-merge-accounting.md)\n- [Apideck Accounting API + MCP vs Xero API + MCP](https://www.anchorterminal.com/compare/apideck-accounting-vs-xero.md)\n- [Apideck Accounting API + MCP vs Pennylane](https://www.anchorterminal.com/compare/apideck-accounting-vs-pennylane.md)\n- [Apideck Accounting API + MCP vs Codat](https://www.anchorterminal.com/compare/apideck-accounting-vs-codat.md)\n- [Merge Accounting API vs Xero API + MCP](https://www.anchorterminal.com/compare/merge-accounting-vs-xero.md)\n- [Merge Accounting API vs Pennylane](https://www.anchorterminal.com/compare/merge-accounting-vs-pennylane.md)\n- [Codat vs Merge Accounting API](https://www.anchorterminal.com/compare/codat-vs-merge-accounting.md)\n- [Pennylane vs Xero API + MCP](https://www.anchorterminal.com/compare/pennylane-vs-xero.md)\n- [Codat vs Xero API + MCP](https://www.anchorterminal.com/compare/codat-vs-xero.md)\n- [Codat vs Pennylane](https://www.anchorterminal.com/compare/codat-vs-pennylane.md)\n\n## Questions\n\n### What are the highest-rated accounting and invoicing APIs for AI agents?\n\nApideck Accounting API + MCP has the highest benchmark score of the 12 ranked accounting and invoicing APIs, 72.9 (BB). Merge Accounting API is second with 70 (BB).\n\n### How many accounting and invoicing APIs are agent-ready?\n\n2 of the 12 ranked here grade BB or better, the bar for agent-ready on the Anchor benchmark.\n\n### Which accounting and invoicing APIs accept x402 payments?\n\nNone of the ranked listings here accepts x402 for its main call yet.\n\n### How is this list ranked?\n\nBy the Anchor benchmark score out of 100, a weighted mean of the scored categories minus deductions for negative events, from public evidence re-checked as vendors change. Listings cannot pay for a place. The latest assessment behind this page is from 9 October 2026.\n\n## How this list is made\n\nThe order is the Anchor benchmark score, the same number as on each listing. Each listing is graded from public evidence against the benchmark checklist, and the picks are worked out from those grades, prices and facts. 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Picks by need, strengths, weaknesses and prices from the Anchor benchmark.", "facts": [ "Apideck Accounting API + MCP BB", "Merge Accounting API BB", "Xero API + MCP B" ], "h1": "Best accounting and invoicing APIs for AI agents", "image": "https://www.anchorterminal.com/assets/og/best-accounting.png", "path": "/best/accounting/", "published": "", "section": "tools", "title": "Best accounting and invoicing APIs for AI agents in 2026, ranked", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/best/accounting/" }, "tokens": { "markdown": 5700, "slim": 1480 }, "version": 1 }