{ "data": { "a": { "slug": "kintsugi", "name": "Kintsugi", "vendor": "Kintsugi AI, Inc.", "vendorUrl": "https://trykintsugi.com", "kind": "http-api", "category": "tax", "summary": "Kintsugi is a hosted sales tax, VAT and GST compliance platform. Its API estimates tax, records transactions, customers and exemptions, and manages nexus, registrations and filings. Two MCP servers connect AI assistants to the API and to account data.", "url": "https://www.anchorterminal.com/tools/kintsugi", "markdownUrl": "https://www.anchorterminal.com/tools/kintsugi.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/kintsugi.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/kintsugi.json", "repo": "https://github.com/kintsugi-tax/kintsugi-tax-python-sdk", "license": "Proprietary service under the Kintsugi Terms of Service. The Python SDK repository is MIT", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.trykintsugi.com", "packages": [ { "registry": "pypi", "name": "kintsugi-tax-platform-sdk" }, { "registry": "npm", "name": "@kintsugi-tax/tax-platform-sdk" } ], "auth": "mixed", "authNotes": "API keys are self-serve in the app under Configuration, API Keys, but only on a paid plan that includes them, and the pricing page lists API access under Premium, which is arranged through sales. The Tenanted API takes the key in `Api-Key`. v1, the SDKs and the docs MCP server take `x-api-key` with `x-organization-id`. A key belongs to one organisation, can expire, and has no scopes. Key and user management endpoints accept only an Owner or Admin session token. The account-data MCP server uses OAuth 2.1 with PKCE, dynamic client registration and the scope `read:user_data`, signed in with the app login.", "pricing": "paid", "pricingNotes": "API access is listed only under Premium, which is priced on request. Free is $0 with no card and covers exposure monitoring, CSV imports and no-code integrations, without API keys. Starter starts at $75 per filing or registration. No free tier or sandbox with live API access was found, so an agent can't start on the API without a Premium plan. The API Lab in the docs runs against simulated responses (https://trykintsugi.com/pricing, checked 2026-10-08).", "priceSummary": "$75 / tx", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the API docs, the OpenAPI file or the pricing page (checked 2026-10-08).", "endpoints": [] }, "toolCount": 55, "popularity": { "githubStars": null, "npmWeekly": 71, "pypiWeekly": 10, "asOf": "2026-10-08" }, "docsUrl": "https://docs.trykintsugi.com", "llmsTxt": "https://docs.trykintsugi.com/llms.txt", "openapi": "https://api.trykintsugi.com/openapi.json", "capabilities": [ "tax.calculate", "tax.transactions", "tax.filing", "tax.exemptions" ], "tags": [ "hosted", "paid", "closed-source", "api-key", "oauth", "mcp", "openapi", "llms-txt", "python", "typescript", "java", "php", "ruby", "sales-led", "status-page", "soc2" ], "lastRelease": "2026-10-07", "graded": true, "anchor": { "graded": true, "score": 60.7, "grade": "C", "agentReady": false, "rank": 392, "ranked": true, "rankOf": 722, "categoryRank": 3, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 75, "maintenance": 78, "payments": 13, "reliability": 73, "schema": 87, "security": 52, "transparency": 60 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": -3, "negativeNotes": [ "2 to 7 October 2026. The API changelog marks five changes applied to the pinned 2026-07-21 release as breaking (address access rules and import `userId` on 2 October, filing pause window and a changed error code on 5 October, billing callers on 7 October), while the docs say a pinned release can't change an integration. Each is documented with migration steps on the day, so we deducted the minimum of 3. No advance notice was found (https://docs.trykintsugi.com/reference/changelog)" ], "verdict": "The docs are built for machine readers, with llms.txt, Markdown pages, a public OpenAPI 3.1 file, a dated changelog and an MCP server whose 55 tools carry read-only and destructive annotations. API keys need the custom-priced Premium plan and carry no scopes, no general rate limit is published, and breaking changes reached the pinned 2026-07-21 release in October 2026.", "bestFor": "An agent working for a seller that already has Kintsugi Premium and wants estimates, transaction sync, exemptions, nexus, registrations and filing status through one API, or read-only answers about an account through the OAuth MCP server.", "strengths": [ "Docs served for agents. `llms.txt` indexes 682 pages, every page has a `.md` twin, and `llms-full.txt` holds the full text", "Public OpenAPI 3.1 file at `https://api.trykintsugi.com/openapi.json`, readable without a key, with 901 operations and 1,325 schemas", "The MCP server at `https://docs.trykintsugi.com/mcp` lists 55 tools, each with readOnlyHint, destructiveHint and idempotentHint set", "A second MCP server at `https://mcp.trykintsugi.com/mcp` uses OAuth 2.1 with PKCE and dynamic client registration, and Kintsugi says its 46 tools are all read-only", "One error envelope on the Tenanted API with a stable `code`, a `requestId` and field-level `errors`, and creates that are idempotent on `externalId` and `source`" ], "weaknesses": [ "API access, SDKs and real-time tax calculation are listed only under Premium, which is priced on request. API keys need a paid plan that includes them", "Nine changelog entries from 17 September to 7 October 2026 are marked breaking, five on the pinned 2026-07-21 release and four on v1. No advance notice was found", "No general rate limit is published and no `Retry-After` header is documented. The docs say only to retry 429, 500 and 503 with backoff", "API keys act on a whole organisation with no scopes or read-only mode. Expiry is the only setting", "No `security.txt`, disclosure policy, bug bounty, uptime SLA document or subprocessor list was found on the public pages" ], "agentNotes": [ "Send `Api-Key` and pin `Api-Version` (for example `2026-10-06`) on Tenanted API calls to `https://api.trykintsugi.com`. Without the header a request runs against `2026-07-21`", "Use `x-api-key` and `x-organization-id` with `/v1` paths for the SDKs and the docs MCP server. They don't cover the Tenanted API", "Call `POST /tax-estimations` for a quote. Nothing is stored. Record the sale with a transaction create, which answers 202, then check `processingStatus` before reading tax totals", "Always send `externalId` on creates. A repeat with the same `externalId` and `source` returns the stored record with 200 and doesn't apply the new fields", "Branch on the error `code`, not the message. Retry 429, 500 and 503 with exponential backoff, and restart paging from the first page on `stale_cursor`" ], "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": 60.7 } ], "editorialScores": { "ergonomics": 75, "maintenance": 78, "payments": 13, "reliability": 73, "schema": 87, "security": 52, "transparency": 44 }, "provenanceScore": 75 }, "connect": { "install": "pip install kintsugi-tax-platform-sdk", "http": "curl https://api.trykintsugi.com/products/categories \\\n -H \"Api-Key: $KINTSUGI_API_KEY\" \\\n -H \"Api-Version: 2026-07-21\"", "config": { "mcpServers": { "kintsugi": { "headers": { "X-API-KEY": "your-api-key", "X-ORGANIZATION-ID": "your-org-id" }, "url": "https://docs.trykintsugi.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/tax.calculate", "tool": "https://letme.dev/kintsugi" }, "area": "domain-data", "unitPrices": [ { "item": "Starter plan, per filing or registration", "unit": "tx", "usd": 75, "note": "Starting price. API access is not included in Starter and is listed only under Premium, which is quoted by sales" } ], "provenance": { "legalEntity": "Kintsugi AI, Inc.", "domain": "trykintsugi.com", "domainRegistered": "2023-03-10", "endpointOnVendorDomain": true, "terms": "https://trykintsugi.com/terms-of-service", "privacy": "https://trykintsugi.com/privacy-policy", "statusPage": "https://status.trykintsugi.com", "changelog": "https://docs.trykintsugi.com/reference/changelog", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The terms of service (last updated 29 September 2026) name Kintsugi AI, Inc., a Delaware corporation at 2261 Market St, Suite 5931, San Francisco, and cover the platform unless a signed Customer Agreement applies.", "The terms incorporate the privacy policy (last updated 13 April 2025) and the Data Processing Agreement at trykintsugi.com/data-processing-agreement (last updated 26 August 2026).", "The API answers at api.trykintsugi.com and the MCP servers at docs.trykintsugi.com and mcp.trykintsugi.com, all on the vendor's domain.", "trykintsugi.com/.well-known/security.txt returns 404. The security page names no disclosure address or bug bounty.", "RDAP for trykintsugi.com gives a registration date of 2023-03-10 and GoDaddy as registrar." ], "score": 75 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/kintsugi.json", "live": { "slug": "kintsugi", "probe": { "target": "https://api.trykintsugi.com", "method": "get", "lastAt": "2026-10-08T22:39:50.201568106Z", "lastOk": true, "lastStatus": 404, "lastMs": 582, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 572, "p95ms24h": 672, "samples24h": 36, "samples30d": 36, "days": [ { "date": "2026-10-08", "probes": 36, "ok": 36 } ] }, "vendorStatus": { "page": "https://status.trykintsugi.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T22:39:26.488867507Z" }, "updatedAt": "2026-10-08T22:39:50.201568106Z" } }, "answer": "Kintsugi scores 60.7 (C) on agent readiness against Zamp's 49.5 (D), and leads in 6 of 7 scored categories. Zamp leads on 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": "2026-10-08T22:40:03.790649161Z", "lastOk": true, "lastStatus": 418, "lastMs": 330, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 272, "p95ms24h": 1314, "samples24h": 36, "samples30d": 36, "days": [ { "date": "2026-10-08", "probes": 36, "ok": 36 } ] }, "vendorStatus": { "page": "https://zamp.statuspage.io", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T22:39:46.503453266Z" }, "updatedAt": "2026-10-08T22:40:03.790649161Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Kintsugi AI, Inc.", "b": "Zamp Inc.", "name": "Vendor" }, { "a": "https://api.trykintsugi.com", "b": "https://api.zamp.com", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP", "b": "HTTP", "name": "Transports" }, { "a": "OAuth or key", "b": "API key", "name": "Auth" }, { "a": "Paid", "b": "Paid", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under the Kintsugi Terms of Service. The Python SDK repository is MIT", "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": "55", "b": "none", "name": "Tools exposed" }, { "a": "yes", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-07", "b": "2026-08-31", "name": "Last release" }, { "a": "2026-09-29", "b": "no date given", "name": "Terms last updated" }, { "a": "2025-04-13", "b": "2025-02-11", "name": "Privacy policy last updated" }, { "a": "yes", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "yes", "b": "yes", "name": "Terms restrict automated access" }, { "a": "yes", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "71 npm/wk, 10 PyPI/wk", "b": "none", "name": "Popularity" } ], "faq": [ { "answer": "Kintsugi scores 60.7 (C) on agent readiness against Zamp's 49.5 (D), and leads in 6 of 7 scored categories. Zamp leads on payments \u0026 pricing.", "question": "Which is better for AI agents, Kintsugi or Zamp?" }, { "answer": "Kintsugi takes an API key or an OAuth sign-in. Zamp needs an API key.", "question": "Do Kintsugi and Zamp need an API key?" }, { "answer": "Yes. Kintsugi has a hosted endpoint at https://api.trykintsugi.com and Zamp at https://api.zamp.com.", "question": "Can an agent call Kintsugi and Zamp without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 87 against 44", "Agent ergonomics, 75 against 64", "Security \u0026 auth, 52 against 40", "Maintenance \u0026 community, 78 against 42", "Transparency \u0026 trust, 60 against 50" ], "also": null, "goodFor": "An agent working for a seller that already has Kintsugi Premium and wants estimates, transaction sync, exemptions, nexus, registrations and filing status through one API, or read-only answers about an account through the OAuth MCP server.", "slug": "kintsugi", "watchFor": "API access, SDKs and real-time tax calculation are listed only under Premium, which is priced on request. API keys need a paid plan that includes them" }, { "aheadOn": [ "Payments \u0026 pricing, 20 against 13" ], "also": [ "Free to start without a card", "No incidents deducted, where Kintsugi loses 3 points for them" ], "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-kintsugi.json", "title": "Anrok vs Kintsugi", "url": "https://www.anchorterminal.com/compare/anrok-vs-kintsugi" }, { "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-kintsugi.json", "title": "Avalara AvaTax vs Kintsugi", "url": "https://www.anchorterminal.com/compare/avalara-vs-kintsugi" }, { "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-zamp.json", "title": "Fonoa vs Zamp", "url": "https://www.anchorterminal.com/compare/fonoa-vs-zamp" }, { "json": "https://www.anchorterminal.com/compare/kintsugi-vs-numeral.json", "title": "Kintsugi vs Numeral", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-numeral" }, { "json": "https://www.anchorterminal.com/compare/kintsugi-vs-quaderno.json", "title": "Kintsugi vs Quaderno", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-quaderno" }, { "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/kintsugi-vs-taxjar.json", "title": "Kintsugi vs TaxJar", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/kintsugi-vs-vertex-tax.json", "title": "Kintsugi vs Vertex O Series", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-vertex-tax" }, { "json": "https://www.anchorterminal.com/compare/numeral-vs-zamp.json", "title": "Numeral vs Zamp", "url": "https://www.anchorterminal.com/compare/numeral-vs-zamp" }, { "json": "https://www.anchorterminal.com/compare/quaderno-vs-zamp.json", "title": "Quaderno vs Zamp", "url": "https://www.anchorterminal.com/compare/quaderno-vs-zamp" }, { "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": 1, "edge": "kintsugi", "key": "reliability", "kintsugi": 73, "name": "Reliability", "weight": 16, "zamp": 72 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 43, "edge": "kintsugi", "key": "schema", "kintsugi": 87, "name": "Schema \u0026 documentation", "weight": 13, "zamp": 44 }, { "by": 11, "edge": "kintsugi", "key": "ergonomics", "kintsugi": 75, "name": "Agent ergonomics", "weight": 13, "zamp": 64 }, { "by": 12, "edge": "kintsugi", "key": "security", "kintsugi": 52, "name": "Security \u0026 auth", "weight": 14, "zamp": 40 }, { "by": 7, "edge": "zamp", "key": "payments", "kintsugi": 13, "name": "Payments \u0026 pricing", "weight": 10, "zamp": 20 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 36, "edge": "kintsugi", "key": "maintenance", "kintsugi": 78, "name": "Maintenance \u0026 community", "weight": 7, "zamp": 42 }, { "by": 10, "edge": "kintsugi", "key": "transparency", "kintsugi": 60, "name": "Transparency \u0026 trust", "weight": 7, "zamp": 50 } ], "summary": "Kintsugi scores 60.7 (C) on agent readiness against Zamp's 49.5 (D), and leads in 6 of 7 scored categories. Zamp leads on payments \u0026 pricing. Both do tax calculate.", "verdicts": { "kintsugi": "The docs are built for machine readers, with llms.txt, Markdown pages, a public OpenAPI 3.1 file, a dated changelog and an MCP server whose 55 tools carry read-only and destructive annotations. API keys need the custom-priced Premium plan and carry no scopes, no general rate limit is published, and breaking changes reached the pinned 2026-07-21 release in October 2026.", "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." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/kintsugi-vs-zamp", "json": "https://www.anchorterminal.com/compare/kintsugi-vs-zamp.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/kintsugi-vs-zamp.md", "slim": "https://www.anchorterminal.com/compare/kintsugi-vs-zamp.min.md" }, "markdown": "Kintsugi scores 60.7 (C) on agent readiness against Zamp's 49.5 (D), and leads in 6 of 7 scored categories. Zamp leads on payments \u0026 pricing. Both do tax calculate.\n\n- Kintsugi: grade C, 60.7/100, rank #392 of 722. Markdown https://www.anchorterminal.com/tools/kintsugi.md · JSON https://www.anchorterminal.com/api/v1/tools/kintsugi.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### Kintsugi (C)\n\nGood for: An agent working for a seller that already has Kintsugi Premium and wants estimates, transaction sync, exemptions, nexus, registrations and filing status through one API, or read-only answers about an account through the OAuth MCP server.\n\nAhead on:\n- Schema \u0026 documentation, 87 against 44\n- Agent ergonomics, 75 against 64\n- Security \u0026 auth, 52 against 40\n- Maintenance \u0026 community, 78 against 42\n- Transparency \u0026 trust, 60 against 50\n\nWatch for: API access, SDKs and real-time tax calculation are listed only under Premium, which is priced on request. API keys need a paid plan that includes them\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- Payments \u0026 pricing, 20 against 13\n\nAlso in its favour:\n- Free to start without a card\n- No incidents deducted, where Kintsugi loses 3 points for them\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 | Kintsugi | Zamp | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 73 | 72 | Kintsugi +1 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 87 | 44 | Kintsugi +43 |\n| Agent ergonomics | 13% (16.2 this run) | 75 | 64 | Kintsugi +11 |\n| Security \u0026 auth | 14% (17.5 this run) | 52 | 40 | Kintsugi +12 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 13 | 20 | Zamp +7 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 78 | 42 | Kintsugi +36 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 60 | 50 | Kintsugi +10 |\n| Negative events | ≤15 | -3 | 0 | |\n| **Total** | | **60.7 · C** | **49.5 · D** | |\n\n## Facts side by side\n\n| Fact | Kintsugi | Zamp |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Kintsugi AI, Inc. | Zamp Inc. |\n| Hosted endpoint | `https://api.trykintsugi.com` | `https://api.zamp.com` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Paid | Paid |\n| x402 | no | no |\n| Licence | Proprietary service under the Kintsugi Terms of Service. The Python SDK repository is MIT | 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| Tools exposed | 55 | none |\n| Read-only variant documented | yes | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-07 | 2026-08-31 |\n| Terms last updated | 2026-09-29 | no date given |\n| Privacy policy last updated | 2025-04-13 | 2025-02-11 |\n| Customer content may train models | yes | not found in the text |\n| Terms restrict automated access | yes | yes |\n| Terms restrict benchmarking | yes | yes |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | yes | not found in the text |\n| Popularity | 71 npm/wk, 10 PyPI/wk | none |\n\n## Verdicts\n\n**Kintsugi.** The docs are built for machine readers, with llms.txt, Markdown pages, a public OpenAPI 3.1 file, a dated changelog and an MCP server whose 55 tools carry read-only and destructive annotations. API keys need the custom-priced Premium plan and carry no scopes, no general rate limit is published, and breaking changes reached the pinned 2026-07-21 release in October 2026.\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### Kintsugi\n\n1. Send `Api-Key` and pin `Api-Version` (for example `2026-10-06`) on Tenanted API calls to `https://api.trykintsugi.com`. Without the header a request runs against `2026-07-21`\n2. Use `x-api-key` and `x-organization-id` with `/v1` paths for the SDKs and the docs MCP server. They don't cover the Tenanted API\n3. Call `POST /tax-estimations` for a quote. Nothing is stored. Record the sale with a transaction create, which answers 202, then check `processingStatus` before reading tax totals\n4. Always send `externalId` on creates. A repeat with the same `externalId` and `source` returns the stored record with 200 and doesn't apply the new fields\n5. Branch on the error `code`, not the message. Retry 429, 500 and 503 with exponential backoff, and restart paging from the first page on `stale_cursor`\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, Kintsugi or Zamp?\n\nKintsugi scores 60.7 (C) on agent readiness against Zamp's 49.5 (D), and leads in 6 of 7 scored categories. Zamp leads on payments \u0026 pricing.\n\n### Do Kintsugi and Zamp need an API key?\n\nKintsugi takes an API key or an OAuth sign-in. Zamp needs an API key.\n\n### Can an agent call Kintsugi and Zamp without installing anything?\n\nYes. Kintsugi has a hosted endpoint at https://api.trykintsugi.com and Zamp at https://api.zamp.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/kintsugi-vs-zamp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/kintsugi-vs-zamp.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"kintsugi\", \"b\": \"zamp\"}`. From a terminal: `anchor compare kintsugi zamp`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/kintsugi.json and https://www.anchorterminal.com/api/v1/tools/zamp.json\n\n## Other comparisons with Kintsugi or Zamp\n\n- [Anrok vs Kintsugi](https://www.anchorterminal.com/compare/anrok-vs-kintsugi.md)\n- [Anrok vs Zamp](https://www.anchorterminal.com/compare/anrok-vs-zamp.md)\n- [Avalara AvaTax vs Kintsugi](https://www.anchorterminal.com/compare/avalara-vs-kintsugi.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 Zamp](https://www.anchorterminal.com/compare/fonoa-vs-zamp.md)\n- [Kintsugi vs Numeral](https://www.anchorterminal.com/compare/kintsugi-vs-numeral.md)\n- [Kintsugi vs Quaderno](https://www.anchorterminal.com/compare/kintsugi-vs-quaderno.md)\n- [Kintsugi vs TaxCloud](https://www.anchorterminal.com/compare/kintsugi-vs-taxcloud.md)\n- [Kintsugi vs TaxJar](https://www.anchorterminal.com/compare/kintsugi-vs-taxjar.md)\n- [Kintsugi vs Vertex O Series](https://www.anchorterminal.com/compare/kintsugi-vs-vertex-tax.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", "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": "Kintsugi vs Zamp", "url": "" } ], "description": "Kintsugi scores 60.7 (C) on agent readiness against Zamp's 49.5 (D), and leads in 6 of 7 scored categories. Zamp leads on payments \u0026 pricing. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Kintsugi C 60.7", "Zamp D 49.5", "scores" ], "h1": "Kintsugi vs Zamp", "image": "https://www.anchorterminal.com/assets/og/compare-kintsugi-vs-zamp.png", "path": "/compare/kintsugi-vs-zamp", "published": "2026-10-01", "section": "tools", "title": "Kintsugi vs Zamp for AI agents, C 60.7 vs D 49.5 | Anchor Terminal", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-zamp" }, "tokens": { "markdown": 2300, "slim": 730 }, "version": 1 }