{
  "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": "2026-10-08T21:53:22.577198926Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 68,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 81,
          "p95ms24h": 161,
          "samples24h": 28,
          "samples30d": 28,
          "days": [
            {
              "date": "2026-10-08",
              "probes": 28,
              "ok": 28
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.fonoa.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-08T19:38:33.601208747Z"
        },
        "updatedAt": "2026-10-08T21:53:22.577198926Z"
      }
    },
    "answer": "Fonoa scores 51.7 (D) on agent readiness against Zamp's 49.5 (D), and leads in 3 of 7 scored categories. Zamp leads on reliability and payments \u0026 pricing.",
    "b": {
      "slug": "zamp",
      "name": "Zamp",
      "vendor": "Zamp Inc.",
      "vendorUrl": "https://zamp.com",
      "kind": "http-api",
      "category": "tax",
      "summary": "Zamp is a managed sales tax service for US and Canadian sellers. Its REST API calculates tax by address, records transactions for filing and reads registrations and filings, while Zamp's team registers, files and remits.",
      "url": "https://www.anchorterminal.com/tools/zamp",
      "markdownUrl": "https://www.anchorterminal.com/tools/zamp.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/zamp.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/zamp.json",
      "license": "Proprietary service under Zamp's Standard Terms and Conditions, which form part of a signed Order Form. The sandbox has its own Developer trial terms",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://api.zamp.com",
      "packages": [],
      "auth": "api-key",
      "authNotes": "Every request carries an API key as a Bearer token in the `Authorization` header. A 30-day sandbox key is emailed after a form that asks for a business email, with no card or sales call. A production key is copied from the Integrations page of app.zamp.com or issued by Zamp's account team, and a Zamp account comes through a demo and an Order Form. No scopes, read-only keys or expiry settings were found in the reviewed documentation. The docs tell users to rotate or reset an exposed key without describing how.",
      "pricing": "paid",
      "pricingNotes": "No price is published. The pricing page names three plans, Free, U.S. and U.S. + Canada, and the two paid plans read \"Contact sales\". Free includes a rate-limited 30-day API sandbox with no card. Zamp says API calls are never metered and that usage is counted in committed transactions. The terms count ten calculation calls as one transaction for customers who use calculation only (https://zamp.com/pricing, https://zamp.com/terms-conditions section 6.2, checked 2026-10-08).",
      "priceSummary": "Paid",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the developer docs, the pricing page or the terms (checked 2026-10-08).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-10-08"
      },
      "docsUrl": "https://developer.zamp.com",
      "llmsTxt": "https://developer.zamp.com/llms.txt",
      "capabilities": [
        "tax.calculate",
        "tax.transactions",
        "tax.filing",
        "tax.exemptions",
        "shipping.address-validation"
      ],
      "tags": [
        "hosted",
        "paid",
        "closed-source",
        "api-key",
        "llms-txt",
        "sandbox",
        "free-trial",
        "no-card",
        "sales-led",
        "status-page"
      ],
      "lastRelease": "2026-08-31",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 49.5,
        "grade": "D",
        "agentReady": false,
        "rank": 609,
        "ranked": true,
        "rankOf": 722,
        "categoryRank": 9,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 64,
          "maintenance": 42,
          "payments": 20,
          "reliability": 72,
          "schema": 44,
          "security": 40,
          "transparency": 50
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-08"
        },
        "negative": 0,
        "verdict": "A free 30-day sandbox key needs no card or sales call, and the docs are served as Markdown with llms.txt and a published limit of 1,000 requests a minute. There is no OpenAPI file, SDK, API changelog or published price, production keys come with a sales-led account, and the site footer says SOC 2 compliance is in progress.",
        "bestFor": "An agent working for a US or Canadian seller that wants Zamp's team to register, file and remit, and needs calculation and transaction sync through a small API.",
        "strengths": [
          "Free 30-day sandbox key by email with no card or sales call, preloaded with all 47 remote-seller state registrations",
          "Docs served as Markdown with `llms.txt` and `llms-full.txt`, and cURL, Node.js and Python examples in the quickstart",
          "Published limit of 1,000 requests a minute, and responses carry `x-zamp-rate-limit-remaining` and `x-zamp-rate-limit-reset` headers",
          "Errors return a named code and message, and validation failures add an `issues` array with the path of each bad field",
          "One transaction object is used by `/calculations` and `/transactions`, with a per-jurisdiction breakdown in every response"
        ],
        "weaknesses": [
          "No OpenAPI file for the API. The one file on the docs host is the documentation platform's plant store sample",
          "No price is published. The U.S. and U.S. + Canada plans read \"Contact sales\", and production keys come with a Zamp account",
          "No API changelog, version in the path, deprecation policy or official SDK found in the reviewed documentation",
          "API keys have no scopes or read-only mode in the reviewed documentation, and `DELETE /transactions/:id` deletes permanently",
          "No security.txt or disclosure policy found, and the site footer says SOC 2 compliance is in progress",
          "No webhooks, and registrations can't be started or approved through the API"
        ],
        "agentNotes": [
          "Call `POST /calculations` for a quote and `POST /transactions` only when the sale is final. Put the returned `taxDue` in `taxCollected` when posting",
          "Keep transaction and line item ids to 25 characters. A repeated `POST /transactions` with an existing id returns 409 `CONFLICT`, so a retry doesn't create a second record",
          "For a refund, post a new transaction with `parentId` set to the sale's id and a negative `quantity`. Never send a negative `amount` on a line item",
          "Send `shipToAddress.state` and `country` set to CA for Canadian orders. `POST /addresses` validates US addresses only",
          "Page lists with `limit` (1 to 100, default 10) and `cursor` until `nextCursor` is null. `GET /transactions` returns only transactions written with the same key",
          "Don't store sensitive or personal data in the sandbox. Trial data is deleted after 30 days and the trial terms forbid live customer data"
        ],
        "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": 49.5
          }
        ],
        "editorialScores": {
          "ergonomics": 64,
          "maintenance": 42,
          "payments": 20,
          "reliability": 72,
          "schema": 44,
          "security": 40,
          "transparency": 27
        },
        "provenanceScore": 73
      },
      "connect": {
        "http": "curl -X POST https://api.zamp.com/calculations \\\n  -H \"Authorization: Bearer {your-api-key}\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"id\":\"123\",\"name\":\"INV-123\",\"transactedAt\":\"2023-07-01T00:00:00.000Z\",\"isResale\":false,\"discount\":2,\"subtotal\":18,\"shippingHandling\":5,\"total\":23,\"shipToAddress\":{\"line1\":\"120 SW 10TH AVE\",\"line2\":null,\"state\":\"KS\",\"city\":\"TOPEKA\",\"zip\":\"66612\"},\"lineItems\":[{\"id\":\"LI-123\",\"amount\":10,\"quantity\":2,\"discount\":0,\"shippingHandling\":0,\"productName\":\"The Ultimate Sampler\",\"productSku\":\"SAMPLER-100\",\"productTaxCode\":\"R_TPP_FOOD-BEVERAGE_HOME-CONSUMPTION\"}]}'"
      },
      "letme": {
        "capability": "https://letme.dev/tax.calculate",
        "tool": "https://letme.dev/zamp"
      },
      "area": "domain-data",
      "provenance": {
        "legalEntity": "Zamp Inc.",
        "domain": "zamp.com",
        "domainRegistered": "2001-08-01",
        "endpointOnVendorDomain": true,
        "terms": "https://zamp.com/terms-conditions",
        "privacy": "https://zamp.com/privacy-policy",
        "statusPage": "https://zamp.statuspage.io",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-10-08",
        "notes": [
          "The site footer reads \"© 2026 Zamp Inc.\" with an address in Miami, Florida. The terms name the company only as ZAMP, and the Companies API example shows \"Zamp Technologies, Inc.\" trading as Zamp Tax.",
          "The Standard Terms and Conditions at zamp.com/terms-conditions form part of the customer's Order Form and are governed by Delaware law. Section 2.2 covers the API. The page carries no date.",
          "Sandbox use is governed by the Developer trial terms and conditions at developer.zamp.com/guides/developer-trial-terms-and-conditions, effective 1 October 2025.",
          "The privacy policy, last updated 11 February 2025, defines the Service as the website and adds a Global Privacy Statement on data sent through the API. It is the only privacy document found.",
          "The terms refer to a Data Processing Agreement. No link to it was found on the pages we read.",
          "The API answers at api.zamp.com, on the vendor's domain. Its response headers name Vercel as the server.",
          "status.zamp.com redirects to zamp.statuspage.io. The page lists four components and its incident feed is empty.",
          "zamp.com, developer.zamp.com and api.zamp.com all return 404 for /.well-known/security.txt.",
          "No API changelog was found. The docs carry dated release notes for the QuickBooks, WooCommerce and NetSuite connectors only.",
          "RDAP for zamp.com gives a registration date of 2001-08-01, which predates the company's use of the name."
        ],
        "score": 73
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/zamp.json",
      "live": {
        "slug": "zamp",
        "probe": {
          "target": "https://api.zamp.com",
          "method": "get",
          "lastAt": "2026-10-08T21:53:39.098194091Z",
          "lastOk": true,
          "lastStatus": 418,
          "lastMs": 565,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 270,
          "p95ms24h": 1284,
          "samples24h": 28,
          "samples30d": 28,
          "days": [
            {
              "date": "2026-10-08",
              "probes": 28,
              "ok": 28
            }
          ]
        },
        "vendorStatus": {
          "page": "https://zamp.statuspage.io",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-08T21:58:19.582371702Z"
        },
        "updatedAt": "2026-10-08T21:58:19.582371702Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Fonoa Technologies Limited",
        "b": "Zamp Inc.",
        "name": "Vendor"
      },
      {
        "a": "https://api.fonoa.com",
        "b": "https://api.zamp.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 Zamp's Standard Terms and Conditions, which form part of a signed Order Form. The sandbox has its own Developer trial terms",
        "name": "Licence"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-10-02",
        "b": "2026-08-31",
        "name": "Last release"
      },
      {
        "a": "no document linked",
        "b": "no date given",
        "name": "Terms last updated"
      },
      {
        "a": "no date given",
        "b": "2025-02-11",
        "name": "Privacy policy last updated"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Customer content may train models"
      },
      {
        "a": "",
        "b": "yes",
        "name": "Terms restrict automated access"
      },
      {
        "a": "",
        "b": "yes",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Arbitration or class-action waiver"
      }
    ],
    "faq": [
      {
        "answer": "Fonoa scores 51.7 (D) on agent readiness against Zamp's 49.5 (D), and leads in 3 of 7 scored categories. Zamp leads on reliability and payments \u0026 pricing.",
        "question": "Which is better for AI agents, Fonoa or Zamp?"
      },
      {
        "answer": "Both need an API key.",
        "question": "Do Fonoa and Zamp need an API key?"
      },
      {
        "answer": "Yes. Fonoa has a hosted endpoint at https://api.fonoa.com and Zamp at https://api.zamp.com.",
        "question": "Can an agent call Fonoa and Zamp without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Schema \u0026 documentation, 68 against 44",
          "Security \u0026 auth, 47 against 40",
          "Maintenance \u0026 community, 49 against 42"
        ],
        "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": [
          "Reliability, 72 against 66",
          "Payments \u0026 pricing, 20 against 3"
        ],
        "also": [
          "Free to start without a card"
        ],
        "goodFor": "An agent working for a US or Canadian seller that wants Zamp's team to register, file and remit, and needs calculation and transaction sync through a small API.",
        "slug": "zamp",
        "watchFor": "No OpenAPI file for the API. The one file on the docs host is the documentation platform's plant store sample"
      }
    ],
    "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-zamp.json",
        "title": "Anrok vs Zamp",
        "url": "https://www.anchorterminal.com/compare/anrok-vs-zamp"
      },
      {
        "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-zamp.json",
        "title": "Avalara AvaTax vs Zamp",
        "url": "https://www.anchorterminal.com/compare/avalara-vs-zamp"
      },
      {
        "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-taxcloud.json",
        "title": "Fonoa vs TaxCloud",
        "url": "https://www.anchorterminal.com/compare/fonoa-vs-taxcloud"
      },
      {
        "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",
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        "title": "Numeral vs Zamp",
        "url": "https://www.anchorterminal.com/compare/numeral-vs-zamp"
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      {
        "json": "https://www.anchorterminal.com/compare/quaderno-vs-zamp.json",
        "title": "Quaderno vs Zamp",
        "url": "https://www.anchorterminal.com/compare/quaderno-vs-zamp"
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      {
        "json": "https://www.anchorterminal.com/compare/taxcloud-vs-zamp.json",
        "title": "TaxCloud vs Zamp",
        "url": "https://www.anchorterminal.com/compare/taxcloud-vs-zamp"
      },
      {
        "json": "https://www.anchorterminal.com/compare/taxjar-vs-zamp.json",
        "title": "TaxJar vs Zamp",
        "url": "https://www.anchorterminal.com/compare/taxjar-vs-zamp"
      },
      {
        "json": "https://www.anchorterminal.com/compare/vertex-tax-vs-zamp.json",
        "title": "Vertex O Series vs Zamp",
        "url": "https://www.anchorterminal.com/compare/vertex-tax-vs-zamp"
      }
    ],
    "scores": [
      {
        "by": 6,
        "edge": "zamp",
        "fonoa": 66,
        "key": "reliability",
        "name": "Reliability",
        "weight": 16,
        "zamp": 72
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 24,
        "edge": "fonoa",
        "fonoa": 68,
        "key": "schema",
        "name": "Schema \u0026 documentation",
        "weight": 13,
        "zamp": 44
      },
      {
        "by": 0,
        "edge": "",
        "fonoa": 64,
        "key": "ergonomics",
        "name": "Agent ergonomics",
        "weight": 13,
        "zamp": 64
      },
      {
        "by": 7,
        "edge": "fonoa",
        "fonoa": 47,
        "key": "security",
        "name": "Security \u0026 auth",
        "weight": 14,
        "zamp": 40
      },
      {
        "by": 17,
        "edge": "zamp",
        "fonoa": 3,
        "key": "payments",
        "name": "Payments \u0026 pricing",
        "weight": 10,
        "zamp": 20
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 7,
        "edge": "fonoa",
        "fonoa": 49,
        "key": "maintenance",
        "name": "Maintenance \u0026 community",
        "weight": 7,
        "zamp": 42
      },
      {
        "by": 2,
        "edge": "zamp",
        "fonoa": 48,
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "weight": 7,
        "zamp": 50
      }
    ],
    "summary": "Fonoa scores 51.7 (D) on agent readiness against Zamp's 49.5 (D), and leads in 3 of 7 scored categories. Zamp leads on reliability and payments \u0026 pricing. 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.",
      "zamp": "A free 30-day sandbox key needs no card or sales call, and the docs are served as Markdown with llms.txt and a published limit of 1,000 requests a minute. There is no OpenAPI file, SDK, API changelog or published price, production keys come with a sales-led account, and the site footer says SOC 2 compliance is in progress."
    }
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  "markdown": "Fonoa scores 51.7 (D) on agent readiness against Zamp's 49.5 (D), and leads in 3 of 7 scored categories. Zamp leads on reliability and payments \u0026 pricing. 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- Zamp: grade D, 49.5/100, rank #609 of 722. Markdown https://www.anchorterminal.com/tools/zamp.md · JSON https://www.anchorterminal.com/api/v1/tools/zamp.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\nAhead on:\n- Schema \u0026 documentation, 68 against 44\n- Security \u0026 auth, 47 against 40\n- Maintenance \u0026 community, 49 against 42\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### Zamp (D)\n\nGood for: An agent working for a US or Canadian seller that wants Zamp's team to register, file and remit, and needs calculation and transaction sync through a small API.\n\nAhead on:\n- Reliability, 72 against 66\n- Payments \u0026 pricing, 20 against 3\n\nAlso in its favour:\n- Free to start without a card\n\nWatch for: No OpenAPI file for the API. The one file on the docs host is the documentation platform's plant store sample\n\n\n## Score by category\n\n| Category | Weight | Fonoa | Zamp | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 66 | 72 | Zamp +6 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 68 | 44 | Fonoa +24 |\n| Agent ergonomics | 13% (16.2 this run) | 64 | 64 | even |\n| Security \u0026 auth | 14% (17.5 this run) | 47 | 40 | Fonoa +7 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 3 | 20 | Zamp +17 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 49 | 42 | Fonoa +7 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 48 | 50 | Zamp +2 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **51.7 · D** | **49.5 · D** | |\n\n## Facts side by side\n\n| Fact | Fonoa | Zamp |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Fonoa Technologies Limited | Zamp Inc. |\n| Hosted endpoint | `https://api.fonoa.com` | `https://api.zamp.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 Zamp's Standard Terms and Conditions, which form part of a signed Order Form. The sandbox has its own Developer trial terms |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-02 | 2026-08-31 |\n| Terms last updated | no document linked | no date given |\n| Privacy policy last updated | no date given | 2025-02-11 |\n| Customer content may train models |  | not found in the text |\n| Terms restrict automated access |  | yes |\n| Terms restrict benchmarking |  | yes |\n| Terms or service can change without notice |  | not found in the text |\n| Arbitration or class-action waiver |  | not found in the text |\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**Zamp.** A free 30-day sandbox key needs no card or sales call, and the docs are served as Markdown with llms.txt and a published limit of 1,000 requests a minute. There is no OpenAPI file, SDK, API changelog or published price, production keys come with a sales-led account, and the site footer says SOC 2 compliance is in progress.\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### Zamp\n\n1. Call `POST /calculations` for a quote and `POST /transactions` only when the sale is final. Put the returned `taxDue` in `taxCollected` when posting\n2. Keep transaction and line item ids to 25 characters. A repeated `POST /transactions` with an existing id returns 409 `CONFLICT`, so a retry doesn't create a second record\n3. For a refund, post a new transaction with `parentId` set to the sale's id and a negative `quantity`. Never send a negative `amount` on a line item\n4. Send `shipToAddress.state` and `country` set to CA for Canadian orders. `POST /addresses` validates US addresses only\n5. Page lists with `limit` (1 to 100, default 10) and `cursor` until `nextCursor` is null. `GET /transactions` returns only transactions written with the same key\n6. Don't store sensitive or personal data in the sandbox. Trial data is deleted after 30 days and the trial terms forbid live customer data\n\n## Questions\n\n### Which is better for AI agents, Fonoa or Zamp?\n\nFonoa scores 51.7 (D) on agent readiness against Zamp's 49.5 (D), and leads in 3 of 7 scored categories. Zamp leads on reliability and payments \u0026 pricing.\n\n### Do Fonoa and Zamp need an API key?\n\nBoth need an API key.\n\n### Can an agent call Fonoa and Zamp without installing anything?\n\nYes. Fonoa has a hosted endpoint at https://api.fonoa.com and Zamp at https://api.zamp.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/fonoa-vs-zamp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/fonoa-vs-zamp.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"fonoa\", \"b\": \"zamp\"}`. From a terminal: `anchor compare fonoa zamp`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/fonoa.json and https://www.anchorterminal.com/api/v1/tools/zamp.json\n\n## Other comparisons with Fonoa or Zamp\n\n- [Anrok vs Fonoa](https://www.anchorterminal.com/compare/anrok-vs-fonoa.md)\n- [Anrok vs Zamp](https://www.anchorterminal.com/compare/anrok-vs-zamp.md)\n- [Avalara AvaTax vs Fonoa](https://www.anchorterminal.com/compare/avalara-vs-fonoa.md)\n- [Avalara AvaTax vs Zamp](https://www.anchorterminal.com/compare/avalara-vs-zamp.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 TaxCloud](https://www.anchorterminal.com/compare/fonoa-vs-taxcloud.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- [Kintsugi vs Zamp](https://www.anchorterminal.com/compare/kintsugi-vs-zamp.md)\n- [Numeral vs Zamp](https://www.anchorterminal.com/compare/numeral-vs-zamp.md)\n- [Quaderno vs Zamp](https://www.anchorterminal.com/compare/quaderno-vs-zamp.md)\n- [TaxCloud vs Zamp](https://www.anchorterminal.com/compare/taxcloud-vs-zamp.md)\n- [TaxJar vs Zamp](https://www.anchorterminal.com/compare/taxjar-vs-zamp.md)\n- [Vertex O Series vs Zamp](https://www.anchorterminal.com/compare/vertex-tax-vs-zamp.md)\n",
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    "description": "Fonoa scores 51.7 (D) on agent readiness against Zamp's 49.5 (D), and leads in 3 of 7 scored categories. Zamp leads on reliability and payments \u0026 pricing. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Fonoa vs Zamp for AI agents, D 51.7 vs D 49.5 | Anchor Terminal",
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