{ "data": { "a": { "slug": "fonoa", "name": "Fonoa", "vendor": "Fonoa Technologies Limited", "vendorUrl": "https://www.fonoa.com", "kind": "http-api", "category": "tax", "summary": "Fonoa is a hosted indirect tax platform for VAT, GST and sales tax. Its REST API validates tax identification numbers, calculates tax on a transaction and reports e-invoices to tax authorities, with a sandbox and a demo environment.", "url": "https://www.anchorterminal.com/tools/fonoa", "markdownUrl": "https://www.anchorterminal.com/tools/fonoa.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/fonoa.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/fonoa.json", "license": "Proprietary service. The API contract is not published. The public Terms of Service took effect on 14 May 2020 and name older seller sites", "transports": [ "http" ], "remoteUrl": "https://api.fonoa.com", "packages": [], "auth": "api-key", "authNotes": "Every request needs a subscription key in the `Ocp-Apim-Subscription-Key` header. Fonoa issues a primary and a secondary key once a client is onboarded, on request by email or through the sales form, with separate keys for the sandbox and production. No self-serve key page, scopes, read-only keys or expiry were found in the docs. Countries are enabled per tenant, and a call for a country that is not enabled returns `COUNTRIES_NOT_ALLOWED`. Webhooks are set up by asking a Fonoa contact.", "pricing": "paid", "pricingNotes": "No public prices. www.fonoa.com/pricing returns 404 and the site's buttons read \"Get in touch\". No free tier or self-serve trial was found. The sandbox has unlimited usage with fixed data and the demo environment has limited usage, and a key for either comes from Fonoa after contact (https://docs.fonoa.com/reference/environments, checked 2026-10-08).", "priceSummary": "Paid", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the API docs, the OpenAPI definitions or the website (checked 2026-10-08).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-08" }, "docsUrl": "https://docs.fonoa.com", "llmsTxt": "https://docs.fonoa.com/llms.txt", "capabilities": [ "tax.calculate", "tax.transactions", "tax.invoicing" ], "tags": [ "hosted", "paid", "closed-source", "api-key", "openapi", "llms-txt", "sandbox", "webhooks", "sales-led", "status-page", "iso27001" ], "lastRelease": "2026-10-02", "graded": true, "anchor": { "graded": true, "score": 51.7, "grade": "D", "agentReady": false, "rank": 575, "ranked": true, "rankOf": 722, "categoryRank": 8, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 64, "maintenance": 49, "payments": 3, "reliability": 66, "schema": 68, "security": 47, "transparency": 48 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "The API reference is served as Markdown with an OpenAPI definition on each endpoint page, and e-invoicing submissions are idempotent by `transaction_id`. API keys are issued by Fonoa staff after contact, no price, rate limit or changelog is published, and the only public terms date from May 2020 and cover older seller sites.", "bestFor": "An agent working for a company that already has a Fonoa contract and needs tax ID validation, VAT or GST calculation, or e-invoice reporting across many countries through one API.", "strengths": [ "Every reference page is served as Markdown with its OpenAPI 3.0 definition inline, indexed by docs.fonoa.com/llms.txt", "E-invoicing submissions are idempotent by `transaction_id`, and the docs say a transaction can be replayed any number of times", "The sandbox at sandbox.fonoa.com returns fixed outcomes for documented test inputs, including errors, delays and HTTP 500", "Webhooks carry a signed OIDC token with a SHA-256 checksum of the body, valid for one hour", "status.fonoa.com shows 100 per cent over 90 days for its E-Invoicing, Lookup and Tax monitors on 8 October 2026" ], "weaknesses": [ "No self-serve signup. Sandbox, demo and production keys are issued by Fonoa after contact by email or the sales form", "No pricing page. www.fonoa.com/pricing returns 404 and the site's buttons read \"Get in touch\"", "No rate limit numbers found. The 429 response says \"Try again a bit later\" with no `Retry-After` documented", "No changelog, deprecation policy, official SDK or MCP server found. docs.fonoa.com/changelog returns 404", "The only public terms took effect on 14 May 2020 and cover older seller sites. They bar benchmarking and automated access without written permission" ], "agentNotes": [ "Send the key in the `Ocp-Apim-Subscription-Key` header. Use the sandbox key at https://sandbox.fonoa.com and the production key at https://api.fonoa.com", "Treat validations and e-invoicing submissions as asynchronous. POST, then poll the GET endpoint or wait for the webhook, and avoid tight polling", "Reuse the same `transaction_id` on a retry of `/v1/transactions`. A transaction already processed is not processed again", "Commit a calculation with POST `/tax/v2/calculations/\u003cuuid\u003e/commit` only when the sale is final. The commit adds it to revenue tracking", "Ask the Fonoa contact to configure webhooks. There is no API for it, and always fetch `resource_url` as given in the webhook" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 51.7 } ], "editorialScores": { "ergonomics": 64, "maintenance": 49, "payments": 3, "reliability": 66, "schema": 68, "security": 47, "transparency": 27 }, "provenanceScore": 69 }, "connect": { "http": "curl --location 'https://sandbox.fonoa.com/lookup/v2/single-validations' \\\n--header 'Content-Type: application/json' \\\n--header 'Ocp-Apim-Subscription-Key: \u003cyour-sandbox-API-key\u003e' \\\n--data '{\n \"country_iso_code\": \"pl\",\n \"tax_identification_number\": \"2000\"\n}'" }, "letme": { "capability": "https://letme.dev/tax.calculate", "tool": "https://letme.dev/fonoa" }, "area": "domain-data", "provenance": { "legalEntity": "Fonoa Technologies Limited", "domain": "fonoa.com", "domainRegistered": "2004-08-24", "endpointOnVendorDomain": true, "terms": "", "privacy": "https://www.fonoa.com/legal/privacy-notice", "statusPage": "https://status.fonoa.com", "changelog": "", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The privacy notice names Fonoa Technologies Limited, 6th Floor, South Bank House, Barrow Street, Dublin 4, Ireland as data controller. The site footer gives Irish company number 677236.", "No terms URL is recorded. The only terms Fonoa publishes, at www.fonoa.com/legal/terms-of-service, took effect on 14 May 2020, apply to fonoatech.com, efacturacion.net, efiscal.biz, portugal.fonoatech.com and efatture.net, name Fonoa Technologies ltd. and are governed by Croatian law. No service agreement or API terms for fonoa.com customers were found.", "The privacy notice says it does not apply to personal data Fonoa processes on behalf of customers using its software, where Fonoa is a processor under the customer's contract. No date of last update was found on the page.", "The API answers at api.fonoa.com, sandbox.fonoa.com and api-demo.fonoa.com, all on the vendor's domain.", "www.fonoa.com/.well-known/security.txt and www.fonoa.com/security.txt return 404. The security page describes a vulnerability disclosure programme with an email address.", "No changelog was found. docs.fonoa.com/changelog returns 404, and product news is published as blog posts.", "RDAP for fonoa.com gives a registration date of 2004-08-24." ], "score": 69 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/fonoa.json", "live": { "slug": "fonoa", "probe": { "target": "https://api.fonoa.com", "method": "get", "lastAt": "2026-10-08T21:12:10.772964244Z", "lastOk": true, "lastStatus": 404, "lastMs": 63, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 99, "p95ms24h": 161, "samples24h": 21, "samples30d": 21, "days": [ { "date": "2026-10-08", "probes": 21, "ok": 21 } ] }, "vendorStatus": { "page": "https://status.fonoa.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T19:38:33.601208747Z" }, "updatedAt": "2026-10-08T21:12:10.772964244Z" } }, "answer": "TaxCloud scores 57.4 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 4 of 7 scored categories.", "b": { "slug": "taxcloud", "name": "TaxCloud", "vendor": "The Federal Tax Authority, LLC (TaxCloud)", "vendorUrl": "https://taxcloud.com", "kind": "http-api", "category": "tax", "summary": "TaxCloud is a US sales tax service from The Federal Tax Authority, LLC. Its v3 REST API calculates tax on carts, records orders and refunds for filing, stores exemption certificates, verifies addresses and searches product tax codes.", "url": "https://www.anchorterminal.com/tools/taxcloud", "markdownUrl": "https://www.anchorterminal.com/tools/taxcloud.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/taxcloud.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/taxcloud.json", "repo": "https://github.com/FedTax/taxcloud-agent-skills", "license": "Proprietary service under TaxCloud's terms of service. The agent skills repository on GitHub is Apache-2.0", "transports": [ "http" ], "remoteUrl": "https://api.v3.taxcloud.com", "packages": [], "auth": "api-key", "authNotes": "A self-serve API key, generated by a signed-in user at Developer \u003e API in the web app and sent as `X-API-KEY`. Each request also carries a connection ID in the path, created at Integrations \u003e Custom API. The v3 APIs accept a JWT as `Authorization: Bearer` too, and the docs direct integrations to the key. Keys can be listed, created and deleted through the Management API, where creating one needs a signed-in user token. No OAuth, app review or partner approval applies.", "pricing": "paid", "pricingNotes": "The API needs the Premium plan, from $79 a month for 200 orders, with eight public tiers up to $1,299 for 40,000. Each calculation or address verification counts as a tenth of an order. A 30-day trial with Premium access needs no card, so an agent's owner can start without a contract. There is no sandbox (checked 2026-10-08).", "priceSummary": "$79 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the API reference, the guides or the pricing page (checked 2026-10-08).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 0, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-08" }, "docsUrl": "https://docs.taxcloud.com/", "llmsTxt": "https://docs.taxcloud.com/llms.txt", "openapi": "https://docs.taxcloud.com/openapi/api-reference.json", "capabilities": [ "tax.calculate", "tax.transactions", "tax.exemptions", "shipping.address-validation" ], "tags": [ "hosted", "closed-source", "api-key", "openapi", "llms-txt", "no-card", "us-only", "status-page", "agent-skills" ], "lastRelease": "2026-09-24", "graded": true, "anchor": { "graded": true, "score": 57.4, "grade": "C", "agentReady": false, "rank": 475, "ranked": true, "rankOf": 722, "categoryRank": 6, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 64, "maintenance": 57, "payments": 34, "reliability": 66, "schema": 75, "security": 45, "transparency": 51 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "A 30-operation REST API with a public OpenAPI 3.1 contract, llms.txt, Markdown docs and a 30-day trial that needs no card. The vendor publishes no rate limit numbers, no SLA, no API changelog and no official v3 client library, and the security page names no audit or certification.", "bestFor": "An agent working for a US seller that needs tax on a cart at checkout, a record of orders and refunds for filing, and exemption certificates by customer.", "strengths": [ "OpenAPI 3.1 documents for the Sales Tax API (16 operations) and Management API (14), plus llms.txt and a Markdown copy of every docs page", "30-day trial with Premium plan access, the API included, and no card or payment method needed", "Refunds take an `idempotencyKey`, carts upsert by `cartId`, and a repeated void returns 204", "Errors are `application/problem+json` with `title`, `status`, `detail` and an `errors` list, which we confirmed on a 401", "Access keys can be listed, created and deleted through the Management API, and the bulk product delete needs a `confirm_delete` parameter" ], "weaknesses": [ "No rate limit numbers are published. The API page says only that the threshold is high and subject to change", "The security page says TaxCloud does not offer an SLA, and the terms supply the service as is", "No API changelog or deprecation policy was found, and the legacy v1 API has no published end date", "No official client library for v3 was found. The vendor's PHP library targets v1 and was last changed in June 2024", "Each calculation or address check counts as a tenth of an order against the plan, test connections included" ], "agentNotes": [ "Send `X-API-KEY` on every call and put the connection ID in the path, as in `/tax/connections/{connectionId}/carts`. A wrong ID returns 404", "Mark nexus states active in the account first. With none active the API returns zero tax and no error", "Use a separate test connection. There is no sandbox, and orders on a live connection go into filing", "Pass a stable `idempotencyKey` on refunds, and never convert the same cart twice. A second conversion creates a duplicate liability", "Void a wrong order before 12:00 AM Eastern on the 10th of the month after its `completedDate`. Later requests return 422" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 57.4 } ], "editorialScores": { "ergonomics": 64, "maintenance": 57, "payments": 34, "reliability": 66, "schema": 75, "security": 45, "transparency": 33 }, "provenanceScore": 69 }, "connect": { "install": "npx skills add FedTax/taxcloud-agent-skills", "http": "curl https://api.v3.taxcloud.com/tax/connections/\u003cconnectionId\u003e/ping \\\n -H \"X-API-KEY: \u003capiKey\u003e\" \\\n -H \"Accept: application/json\"", "claudeCode": "claude mcp add --transport http taxcloud-docs https://docs.taxcloud.com/_mcp/server" }, "letme": { "capability": "https://letme.dev/tax.calculate", "tool": "https://letme.dev/taxcloud" }, "area": "domain-data", "unitPrices": [ { "item": "Premium, 200 orders a month", "unit": "month", "usd": 79, "note": "the plan with API access; a calculation or address verification counts as a tenth of an order" }, { "item": "Premium, 400 orders a month", "unit": "month", "usd": 149, "note": "monthly billing" }, { "item": "Premium, 1,000 orders a month", "unit": "month", "usd": 299, "note": "monthly billing" }, { "item": "Premium, 10,000 orders a month", "unit": "month", "usd": 749, "note": "monthly billing" }, { "item": "Starter, 100 orders a month", "unit": "month", "usd": 19, "note": "no API access" }, { "item": "Filing subscription, one return a month", "unit": "month", "usd": 39, "note": "separate from the order plan; surcharges for Colorado and Louisiana" } ], "provenance": { "legalEntity": "The Federal Tax Authority, LLC (d/b/a TaxCloud)", "domain": "taxcloud.com", "domainRegistered": "2003-10-06", "endpointOnVendorDomain": true, "terms": "https://taxcloud.com/legal/tos/", "privacy": "https://taxcloud.com/legal/privacy-policy/", "statusPage": "https://status.taxcloud.com", "changelog": "", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The terms of service (last updated March 2025) are with The Federal Tax Authority, LLC, a Washington limited liability company, and govern access to and use of the services. No separate API terms were found.", "The privacy policy (last updated 1 February 2025) covers the website including the TaxCloud platform. No data processing agreement or sub-processor list was found on the legal page.", "The API host is api.v3.taxcloud.com and the legacy host is api.taxcloud.net. RDAP gives a registration date of 2003-10-06 for taxcloud.com, with Network Solutions, LLC as registrar.", "status.taxcloud.com redirects to https://taxcloud.statuspage.datadoghq.com, a Datadog status page created on 28 January 2026.", "taxcloud.com/.well-known/security.txt returns 404.", "No changelog was found. docs.taxcloud.com/changelog returns 404." ], "score": 69 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/taxcloud.json", "live": { "slug": "taxcloud", "probe": { "target": "https://api.v3.taxcloud.com", "method": "get", "lastAt": "2026-10-08T21:12:23.03593912Z", "lastOk": true, "lastStatus": 404, "lastMs": 337, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 339, "p95ms24h": 377, "samples24h": 21, "samples30d": 21, "days": [ { "date": "2026-10-08", "probes": 21, "ok": 21 } ] }, "vendorStatus": { "page": "https://status.taxcloud.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T19:39:15.801163493Z" }, "updatedAt": "2026-10-08T21:12:23.03593912Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Fonoa Technologies Limited", "b": "The Federal Tax Authority, LLC (TaxCloud)", "name": "Vendor" }, { "a": "https://api.fonoa.com", "b": "https://api.v3.taxcloud.com", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Paid", "b": "Paid", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service. The API contract is not published. The public Terms of Service took effect on 14 May 2020 and name older seller sites", "b": "Proprietary service under TaxCloud's terms of service. The agent skills repository on GitHub is Apache-2.0", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-02", "b": "2026-09-24", "name": "Last release" }, { "a": "no document linked", "b": "2025-03-01", "name": "Terms last updated" }, { "a": "no date given", "b": "2025-02-01", "name": "Privacy policy last updated" }, { "a": "", "b": "yes", "name": "Customer content may train models" }, { "a": "", "b": "yes", "name": "Terms restrict automated access" }, { "a": "", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "0 stars", "name": "Popularity" } ], "faq": [ { "answer": "TaxCloud scores 57.4 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 4 of 7 scored categories.", "question": "Which is better for AI agents, Fonoa or TaxCloud?" }, { "answer": "Both need an API key.", "question": "Do Fonoa and TaxCloud need an API key?" }, { "answer": "Yes. Fonoa has a hosted endpoint at https://api.fonoa.com and TaxCloud at https://api.v3.taxcloud.com.", "question": "Can an agent call Fonoa and TaxCloud without installing anything?" } ], "goodFor": [ { "aheadOn": null, "also": null, "goodFor": "An agent working for a company that already has a Fonoa contract and needs tax ID validation, VAT or GST calculation, or e-invoice reporting across many countries through one API.", "slug": "fonoa", "watchFor": "No self-serve signup. Sandbox, demo and production keys are issued by Fonoa after contact by email or the sales form" }, { "aheadOn": [ "Schema \u0026 documentation, 75 against 68", "Payments \u0026 pricing, 34 against 3", "Maintenance \u0026 community, 57 against 49" ], "also": [ "Free to start without a card" ], "goodFor": "An agent working for a US seller that needs tax on a cart at checkout, a record of orders and refunds for filing, and exemption certificates by customer.", "slug": "taxcloud", "watchFor": "No rate limit numbers are published. The API page says only that the threshold is high and subject to change" } ], "job": { "capability": "tax.calculate", "name": "Tax calculate" }, "others": [ { "json": "https://www.anchorterminal.com/compare/anrok-vs-fonoa.json", "title": "Anrok vs Fonoa", "url": "https://www.anchorterminal.com/compare/anrok-vs-fonoa" }, { "json": "https://www.anchorterminal.com/compare/anrok-vs-taxcloud.json", "title": "Anrok vs TaxCloud", "url": "https://www.anchorterminal.com/compare/anrok-vs-taxcloud" }, { "json": "https://www.anchorterminal.com/compare/avalara-vs-fonoa.json", "title": "Avalara AvaTax vs Fonoa", "url": "https://www.anchorterminal.com/compare/avalara-vs-fonoa" }, { "json": "https://www.anchorterminal.com/compare/avalara-vs-taxcloud.json", "title": "Avalara AvaTax vs TaxCloud", "url": "https://www.anchorterminal.com/compare/avalara-vs-taxcloud" }, { "json": "https://www.anchorterminal.com/compare/fonoa-vs-kintsugi.json", "title": "Fonoa vs Kintsugi", "url": "https://www.anchorterminal.com/compare/fonoa-vs-kintsugi" }, { "json": "https://www.anchorterminal.com/compare/fonoa-vs-numeral.json", "title": "Fonoa vs Numeral", "url": "https://www.anchorterminal.com/compare/fonoa-vs-numeral" }, { "json": "https://www.anchorterminal.com/compare/fonoa-vs-quaderno.json", "title": "Fonoa vs Quaderno", "url": "https://www.anchorterminal.com/compare/fonoa-vs-quaderno" }, { "json": "https://www.anchorterminal.com/compare/fonoa-vs-taxjar.json", "title": "Fonoa vs TaxJar", "url": "https://www.anchorterminal.com/compare/fonoa-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/fonoa-vs-vertex-tax.json", "title": "Fonoa vs Vertex O Series", "url": "https://www.anchorterminal.com/compare/fonoa-vs-vertex-tax" }, { "json": "https://www.anchorterminal.com/compare/fonoa-vs-zamp.json", "title": "Fonoa vs Zamp", "url": "https://www.anchorterminal.com/compare/fonoa-vs-zamp" }, { "json": "https://www.anchorterminal.com/compare/kintsugi-vs-taxcloud.json", "title": "Kintsugi vs TaxCloud", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-taxcloud" }, { "json": "https://www.anchorterminal.com/compare/numeral-vs-taxcloud.json", "title": "Numeral vs TaxCloud", "url": "https://www.anchorterminal.com/compare/numeral-vs-taxcloud" }, { "json": "https://www.anchorterminal.com/compare/quaderno-vs-taxcloud.json", "title": "Quaderno vs TaxCloud", "url": "https://www.anchorterminal.com/compare/quaderno-vs-taxcloud" }, { "json": "https://www.anchorterminal.com/compare/taxcloud-vs-taxjar.json", "title": "TaxCloud vs TaxJar", "url": "https://www.anchorterminal.com/compare/taxcloud-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/taxcloud-vs-vertex-tax.json", "title": "TaxCloud vs Vertex O Series", "url": "https://www.anchorterminal.com/compare/taxcloud-vs-vertex-tax" }, { "json": "https://www.anchorterminal.com/compare/taxcloud-vs-zamp.json", "title": "TaxCloud vs Zamp", "url": "https://www.anchorterminal.com/compare/taxcloud-vs-zamp" } ], "scores": [ { "by": 0, "edge": "", "fonoa": 66, "key": "reliability", "name": "Reliability", "taxcloud": 66, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 7, "edge": "taxcloud", "fonoa": 68, "key": "schema", "name": "Schema \u0026 documentation", "taxcloud": 75, "weight": 13 }, { "by": 0, "edge": "", "fonoa": 64, "key": "ergonomics", "name": "Agent ergonomics", "taxcloud": 64, "weight": 13 }, { "by": 2, "edge": "fonoa", "fonoa": 47, "key": "security", "name": "Security \u0026 auth", "taxcloud": 45, "weight": 14 }, { "by": 31, "edge": "taxcloud", "fonoa": 3, "key": "payments", "name": "Payments \u0026 pricing", "taxcloud": 34, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 8, "edge": "taxcloud", "fonoa": 49, "key": "maintenance", "name": "Maintenance \u0026 community", "taxcloud": 57, "weight": 7 }, { "by": 3, "edge": "taxcloud", "fonoa": 48, "key": "transparency", "name": "Transparency \u0026 trust", "taxcloud": 51, "weight": 7 } ], "summary": "TaxCloud scores 57.4 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 4 of 7 scored categories. Both do tax calculate.", "verdicts": { "fonoa": "The API reference is served as Markdown with an OpenAPI definition on each endpoint page, and e-invoicing submissions are idempotent by `transaction_id`. API keys are issued by Fonoa staff after contact, no price, rate limit or changelog is published, and the only public terms date from May 2020 and cover older seller sites.", "taxcloud": "A 30-operation REST API with a public OpenAPI 3.1 contract, llms.txt, Markdown docs and a 30-day trial that needs no card. The vendor publishes no rate limit numbers, no SLA, no API changelog and no official v3 client library, and the security page names no audit or certification." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/fonoa-vs-taxcloud", "json": "https://www.anchorterminal.com/compare/fonoa-vs-taxcloud.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/fonoa-vs-taxcloud.md", "slim": "https://www.anchorterminal.com/compare/fonoa-vs-taxcloud.min.md" }, "markdown": "TaxCloud scores 57.4 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 4 of 7 scored categories. Both do tax calculate.\n\n- Fonoa: grade D, 51.7/100, rank #575 of 722. Markdown https://www.anchorterminal.com/tools/fonoa.md · JSON https://www.anchorterminal.com/api/v1/tools/fonoa.json\n- TaxCloud: grade C, 57.4/100, rank #475 of 722. Markdown https://www.anchorterminal.com/tools/taxcloud.md · JSON https://www.anchorterminal.com/api/v1/tools/taxcloud.json\n\n## Which one, for what\n\n### Fonoa (D)\n\nGood for: An agent working for a company that already has a Fonoa contract and needs tax ID validation, VAT or GST calculation, or e-invoice reporting across many countries through one API.\n\nWatch for: No self-serve signup. Sandbox, demo and production keys are issued by Fonoa after contact by email or the sales form\n\n### TaxCloud (C)\n\nGood for: An agent working for a US seller that needs tax on a cart at checkout, a record of orders and refunds for filing, and exemption certificates by customer.\n\nAhead on:\n- Schema \u0026 documentation, 75 against 68\n- Payments \u0026 pricing, 34 against 3\n- Maintenance \u0026 community, 57 against 49\n\nAlso in its favour:\n- Free to start without a card\n\nWatch for: No rate limit numbers are published. The API page says only that the threshold is high and subject to change\n\n\n## Score by category\n\n| Category | Weight | Fonoa | TaxCloud | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 66 | 66 | even |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 68 | 75 | TaxCloud +7 |\n| Agent ergonomics | 13% (16.2 this run) | 64 | 64 | even |\n| Security \u0026 auth | 14% (17.5 this run) | 47 | 45 | Fonoa +2 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 3 | 34 | TaxCloud +31 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 49 | 57 | TaxCloud +8 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 48 | 51 | TaxCloud +3 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **51.7 · D** | **57.4 · C** | |\n\n## Facts side by side\n\n| Fact | Fonoa | TaxCloud |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Fonoa Technologies Limited | The Federal Tax Authority, LLC (TaxCloud) |\n| Hosted endpoint | `https://api.fonoa.com` | `https://api.v3.taxcloud.com` |\n| Transports | HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Paid | Paid |\n| x402 | no | no |\n| Licence | Proprietary service. The API contract is not published. The public Terms of Service took effect on 14 May 2020 and name older seller sites | Proprietary service under TaxCloud's terms of service. The agent skills repository on GitHub is Apache-2.0 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-02 | 2026-09-24 |\n| Terms last updated | no document linked | 2025-03-01 |\n| Privacy policy last updated | no date given | 2025-02-01 |\n| Customer content may train models | | yes |\n| Terms restrict automated access | | yes |\n| Terms restrict benchmarking | | yes |\n| Terms or service can change without notice | | yes |\n| Arbitration or class-action waiver | | not found in the text |\n| Popularity | none | 0 stars |\n\n## Verdicts\n\n**Fonoa.** The API reference is served as Markdown with an OpenAPI definition on each endpoint page, and e-invoicing submissions are idempotent by `transaction_id`. API keys are issued by Fonoa staff after contact, no price, rate limit or changelog is published, and the only public terms date from May 2020 and cover older seller sites.\n\n**TaxCloud.** A 30-operation REST API with a public OpenAPI 3.1 contract, llms.txt, Markdown docs and a 30-day trial that needs no card. The vendor publishes no rate limit numbers, no SLA, no API changelog and no official v3 client library, and the security page names no audit or certification.\n\n## Before you call either\n\n### Fonoa\n\n1. Send the key in the `Ocp-Apim-Subscription-Key` header. Use the sandbox key at https://sandbox.fonoa.com and the production key at https://api.fonoa.com\n2. Treat validations and e-invoicing submissions as asynchronous. POST, then poll the GET endpoint or wait for the webhook, and avoid tight polling\n3. Reuse the same `transaction_id` on a retry of `/v1/transactions`. A transaction already processed is not processed again\n4. Commit a calculation with POST `/tax/v2/calculations/\u003cuuid\u003e/commit` only when the sale is final. The commit adds it to revenue tracking\n5. Ask the Fonoa contact to configure webhooks. There is no API for it, and always fetch `resource_url` as given in the webhook\n\n### TaxCloud\n\n1. Send `X-API-KEY` on every call and put the connection ID in the path, as in `/tax/connections/{connectionId}/carts`. A wrong ID returns 404\n2. Mark nexus states active in the account first. With none active the API returns zero tax and no error\n3. Use a separate test connection. There is no sandbox, and orders on a live connection go into filing\n4. Pass a stable `idempotencyKey` on refunds, and never convert the same cart twice. A second conversion creates a duplicate liability\n5. Void a wrong order before 12:00 AM Eastern on the 10th of the month after its `completedDate`. Later requests return 422\n\n## Questions\n\n### Which is better for AI agents, Fonoa or TaxCloud?\n\nTaxCloud scores 57.4 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 4 of 7 scored categories.\n\n### Do Fonoa and TaxCloud need an API key?\n\nBoth need an API key.\n\n### Can an agent call Fonoa and TaxCloud without installing anything?\n\nYes. Fonoa has a hosted endpoint at https://api.fonoa.com and TaxCloud at https://api.v3.taxcloud.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/fonoa-vs-taxcloud.json, and with the fewest tokens: https://www.anchorterminal.com/compare/fonoa-vs-taxcloud.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"fonoa\", \"b\": \"taxcloud\"}`. From a terminal: `anchor compare fonoa taxcloud`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/fonoa.json and https://www.anchorterminal.com/api/v1/tools/taxcloud.json\n\n## Other comparisons with Fonoa or TaxCloud\n\n- [Anrok vs Fonoa](https://www.anchorterminal.com/compare/anrok-vs-fonoa.md)\n- [Anrok vs TaxCloud](https://www.anchorterminal.com/compare/anrok-vs-taxcloud.md)\n- [Avalara AvaTax vs Fonoa](https://www.anchorterminal.com/compare/avalara-vs-fonoa.md)\n- [Avalara AvaTax vs TaxCloud](https://www.anchorterminal.com/compare/avalara-vs-taxcloud.md)\n- [Fonoa vs Kintsugi](https://www.anchorterminal.com/compare/fonoa-vs-kintsugi.md)\n- [Fonoa vs Numeral](https://www.anchorterminal.com/compare/fonoa-vs-numeral.md)\n- [Fonoa vs Quaderno](https://www.anchorterminal.com/compare/fonoa-vs-quaderno.md)\n- [Fonoa vs TaxJar](https://www.anchorterminal.com/compare/fonoa-vs-taxjar.md)\n- [Fonoa vs Vertex O Series](https://www.anchorterminal.com/compare/fonoa-vs-vertex-tax.md)\n- [Fonoa vs Zamp](https://www.anchorterminal.com/compare/fonoa-vs-zamp.md)\n- [Kintsugi vs TaxCloud](https://www.anchorterminal.com/compare/kintsugi-vs-taxcloud.md)\n- [Numeral vs TaxCloud](https://www.anchorterminal.com/compare/numeral-vs-taxcloud.md)\n- [Quaderno vs TaxCloud](https://www.anchorterminal.com/compare/quaderno-vs-taxcloud.md)\n- [TaxCloud vs TaxJar](https://www.anchorterminal.com/compare/taxcloud-vs-taxjar.md)\n- [TaxCloud vs Vertex O Series](https://www.anchorterminal.com/compare/taxcloud-vs-vertex-tax.md)\n- [TaxCloud vs Zamp](https://www.anchorterminal.com/compare/taxcloud-vs-zamp.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-08", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Fonoa vs TaxCloud", "url": "" } ], "description": "TaxCloud scores 57.4 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 4 of 7 scored categories. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Fonoa D 51.7", "TaxCloud C 57.4", "scores" ], "h1": "Fonoa vs TaxCloud", "image": "https://www.anchorterminal.com/assets/og/compare-fonoa-vs-taxcloud.png", "path": "/compare/fonoa-vs-taxcloud", "published": "2026-10-01", "section": "tools", "title": "Fonoa vs TaxCloud for AI agents, D 51.7 vs C 57.4 | Anchor Terminal", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/fonoa-vs-taxcloud" }, "tokens": { "markdown": 2050, "slim": 630 }, "version": 1 }