{ "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": "2026-10-08T21:12:12.887517805Z", "lastOk": true, "lastStatus": 404, "lastMs": 596, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 572, "p95ms24h": 658, "samples24h": 21, "samples30d": 21, "days": [ { "date": "2026-10-08", "probes": 21, "ok": 21 } ] }, "vendorStatus": { "page": "https://status.trykintsugi.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T21:06:10.4373132Z" }, "updatedAt": "2026-10-08T21:12:12.887517805Z" } }, "answer": "Kintsugi scores 60.7 (C) on agent readiness against Numeral's 49.3 (D), and leads in 6 of 7 scored categories.", "b": { "slug": "numeral", "name": "Numeral", "vendor": "Numeral Two, Inc.", "vendorUrl": "https://www.numeral.com", "kind": "http-api", "category": "tax", "summary": "Numeral is a hosted sales tax and VAT compliance service from Numeral Two, Inc. Its REST API calculates tax, records transactions and refunds, and manages exempt customers, and Numeral registers and files. A remote MCP server reads the account.", "url": "https://www.anchorterminal.com/tools/numeral", "markdownUrl": "https://www.anchorterminal.com/tools/numeral.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/numeral.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/numeral.json", "repo": "https://github.com/NumeralHQ/numeral-tax-go", "license": "Proprietary service under Numeral's terms of service. The Go, Python and Node SDKs are Apache-2.0", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.numeralhq.com", "packages": [ { "registry": "go", "name": "github.com/NumeralHQ/numeral-tax-go" }, { "registry": "pypi", "name": "numeral-tax" }, { "registry": "npm", "name": "numeral-tax" } ], "auth": "api-key", "authNotes": "The API and the MCP server take a secret API key as a Bearer token, `sk_test_` for the sandbox or `sk_prod_` for live data. Keys are created and revoked in the dashboard at dashboard.numeralhq.com under Developers. No scopes, expiry or OAuth flow were found, and publishable keys are rejected by the MCP server. Dashboard access starts with the get-started form or a demo, and the product page says to book a demo before generating test keys. MCP write tools are enabled per account on request.", "pricing": "paid", "pricingNotes": "Professional is $75 per filing and $150 per state registration, month to month. The tax engine and API are listed under Enterprise at a custom price. Monitoring (nexus study and alerts) is free. Test keys record transactions with no charges or remittance, but no self-serve signup was found and whether a free account can create keys isn't stated (https://www.numeral.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 spec or the pricing page (checked 2026-10-08).", "endpoints": [] }, "toolCount": 14, "popularity": { "githubStars": 0, "npmWeekly": 9, "pypiWeekly": 19, "asOf": "2026-10-08" }, "docsUrl": "https://docs.numeral.com", "llmsTxt": "https://docs.numeral.com/llms.txt", "openapi": "https://docs.numeral.com/api-reference/v2026-03-01/openapi.json", "capabilities": [ "tax.calculate", "tax.transactions", "tax.exemptions", "tax.filing" ], "tags": [ "hosted", "paid", "closed-source", "api-key", "mcp", "openapi", "llms-txt", "sandbox", "sales-led", "go", "python", "typescript" ], "lastRelease": "2026-09-15", "graded": true, "anchor": { "graded": true, "score": 49.3, "grade": "D", "agentReady": false, "rank": 611, "ranked": true, "rankOf": 722, "categoryRank": 10, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 71, "maintenance": 60, "payments": 10, "reliability": 25, "schema": 87, "security": 47, "transparency": 45 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "Docs are written for agents, with a public OpenAPI spec for 32 operations, Markdown pages, llms.txt and a remote MCP server whose 14 tools are read-only by default. No status page, numeric rate limit or SLA was found, the API ignores idempotency keys, and API access is sold on a custom plan after a demo.", "bestFor": "An agent working for a seller or platform that has a Numeral account and needs tax at checkout, committed transactions for filing, and read access to nexus, registrations and filings through MCP.", "strengths": [ "Public OpenAPI 3.0.1 spec for version 2026-03-01 with 32 operations, 74 schemas and 57 enums, plus llms.txt and a Markdown copy of every docs page", "Remote MCP server at `https://mcp.numeralhq.com/mcp` documents 14 read-only tools. Four write tools are off by default and absent from `tools/list` until enabled", "Date-versioned API selected with the `X-API-Version` header, with a changelog and migration notes for each of four versions", "Errors are flat JSON with `code`, `type` and `message`, and the docs list every `type`. MCP tool errors carry a stable `error_code`", "`sk_test_` keys read and write sandbox data only, and the docs say revoking a key takes effect immediately" ], "weaknesses": [ "No status page, uptime SLA or numeric rate limit was found. The product page says rate limits can be removed on request", "The API ignores an `Idempotency-Key` header. A retried commit is safe only if the client handles `REFERENCE_ORDER_ID_ALREADY_EXISTS`", "Secret keys carry no scopes, and the MCP server has no OAuth flow. One key reads all of the account's tax data", "API access is listed under the Enterprise plan at a custom price, and the product page says to book a demo first", "SDKs are early. Go is v0.1.0, `numeral-tax` on PyPI is 0.1.0a1 from December 2025 and on npm is 0.1.0-alpha.2" ], "agentNotes": [ "Send `X-API-Version: 2026-03-01` on every call to `https://api.numeralhq.com`. Merchant, platform and certificate endpoints reject requests without it", "Commit with a stable `reference_order_id`. On `REFERENCE_ORDER_ID_ALREADY_EXISTS` look up the existing transaction, because `Idempotency-Key` is ignored", "Commit before the calculation's `expires_at`. If it has expired, calculate again and commit the new `calculation_id` with the original `reference_order_id`", "Send `amount` as the line total in minor units to `/tax/calculations` and as the per-unit price to `/tax/platform/calculations`", "Start with an `sk_test_` key. Certificate endpoints and MCP certificate tools are live only and answer `TESTMODE_NOT_SUPPORTED` or `live_mode_required`" ], "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": 49.3 } ], "editorialScores": { "ergonomics": 71, "maintenance": 60, "payments": 10, "reliability": 25, "schema": 87, "security": 47, "transparency": 36 }, "provenanceScore": 53 }, "connect": { "install": "go get -u 'github.com/NumeralHQ/numeral-tax-go@v0.1.0'", "http": "curl --request POST \\\n --url https://api.numeralhq.com/tax/calculations \\\n --header 'Authorization: Bearer \u003ctoken\u003e' \\\n --header 'Content-Type: application/json' \\\n --header 'X-API-Version: 2026-03-01' \\\n --data '{ ... }'", "claudeCode": "claude mcp add --transport http numeral https://mcp.numeralhq.com/mcp \\\n --header \"Authorization: Bearer sk_test_...\"", "config": { "mcpServers": { "numeral": { "headers": { "Authorization": "Bearer sk_test_..." }, "type": "http", "url": "https://mcp.numeralhq.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/tax.calculate", "tool": "https://letme.dev/numeral" }, "area": "domain-data", "unitPrices": [ { "item": "Filed return, Professional", "unit": "tx", "usd": 75, "note": "Per return filed. API access is listed under Enterprise at a custom price" }, { "item": "State registration, Professional", "unit": "tx", "usd": 150, "note": "One-time fee per state" } ], "provenance": { "legalEntity": "Numeral Two, Inc.", "domain": "numeral.com", "domainRegistered": "1997-10-02", "endpointOnVendorDomain": false, "terms": "https://www.numeral.com/legal/terms-of-service", "privacy": "", "statusPage": "", "changelog": "https://docs.numeral.com/api-reference/v2026-03-01/changelog", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The terms of service (last updated 10 June 2025) name Numeral Two, Inc. d/b/a Numeral, 527 Howard St, San Francisco, and are governed by California law.", "The API answers at api.numeralhq.com and the MCP server at mcp.numeralhq.com, a second domain. Numeral's docs name both hosts, and the dashboard is at dashboard.numeralhq.com.", "The privacy policy at numeral.com/legal/privacy-policy (effective 11 May 2026) covers the websites and says it does not apply to data processed through the platform and APIs. The privacy link here is the Data Processing Agreement (last updated 2 January 2024), which governs that data.", "www.numeral.com/.well-known/security.txt returns 404, as do the same paths on www.numeralhq.com and api.numeralhq.com.", "No status page was found on the site, the docs or the help centre.", "The trust centre at security.numeral.com is a Oneleet page drawn by script, which we couldn't read.", "RDAP gives registration dates of 1997-10-02 for numeral.com and 2022-07-14 for numeralhq.com." ], "score": 53 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/numeral.json", "live": { "slug": "numeral", "probe": { "target": "https://api.numeralhq.com", "method": "get", "lastAt": "2026-10-08T21:12:16.935226704Z", "lastOk": true, "lastStatus": 200, "lastMs": 602, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 606, "p95ms24h": 672, "samples24h": 21, "samples30d": 21, "days": [ { "date": "2026-10-08", "probes": 21, "ok": 21 } ] }, "updatedAt": "2026-10-08T21:12:16.935226704Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Kintsugi AI, Inc.", "b": "Numeral Two, Inc.", "name": "Vendor" }, { "a": "https://api.trykintsugi.com", "b": "https://api.numeralhq.com", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP", "b": "HTTP, Streamable 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 Numeral's terms of service. The Go, Python and Node SDKs are Apache-2.0", "name": "Licence" }, { "a": "55", "b": "14", "name": "Tools exposed" }, { "a": "yes", "b": "yes", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-07", "b": "2026-09-15", "name": "Last release" }, { "a": "2026-09-29", "b": "no date given", "name": "Terms last updated" }, { "a": "2025-04-13", "b": "no document linked", "name": "Privacy policy last updated" }, { "a": "yes", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "yes", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "yes", "b": "not found in the text", "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": "yes", "name": "Arbitration or class-action waiver" }, { "a": "71 npm/wk, 10 PyPI/wk", "b": "0 stars, 9 npm/wk, 19 PyPI/wk", "name": "Popularity" } ], "faq": [ { "answer": "Kintsugi scores 60.7 (C) on agent readiness against Numeral's 49.3 (D), and leads in 6 of 7 scored categories.", "question": "Which is better for AI agents, Kintsugi or Numeral?" }, { "answer": "Kintsugi takes an API key or an OAuth sign-in. Numeral needs an API key.", "question": "Do Kintsugi and Numeral need an API key?" }, { "answer": "Yes. Kintsugi has a hosted endpoint at https://api.trykintsugi.com and Numeral at https://api.numeralhq.com.", "question": "Can an agent call Kintsugi and Numeral without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 73 against 25", "Security \u0026 auth, 52 against 47", "Maintenance \u0026 community, 78 against 60", "Transparency \u0026 trust, 60 against 45" ], "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": null, "also": [ "No incidents deducted, where Kintsugi loses 3 points for them" ], "goodFor": "An agent working for a seller or platform that has a Numeral account and needs tax at checkout, committed transactions for filing, and read access to nexus, registrations and filings through MCP.", "slug": "numeral", "watchFor": "No status page, uptime SLA or numeric rate limit was found. The product page says rate limits can be removed on request" } ], "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-numeral.json", "title": "Anrok vs Numeral", "url": "https://www.anchorterminal.com/compare/anrok-vs-numeral" }, { "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-numeral.json", "title": "Avalara AvaTax vs Numeral", "url": "https://www.anchorterminal.com/compare/avalara-vs-numeral" }, { "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/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/kintsugi-vs-zamp.json", "title": "Kintsugi vs Zamp", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-zamp" }, { "json": "https://www.anchorterminal.com/compare/numeral-vs-quaderno.json", "title": "Numeral vs Quaderno", "url": "https://www.anchorterminal.com/compare/numeral-vs-quaderno" }, { "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/numeral-vs-taxjar.json", "title": "Numeral vs TaxJar", "url": "https://www.anchorterminal.com/compare/numeral-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/numeral-vs-vertex-tax.json", "title": "Numeral vs Vertex O Series", "url": "https://www.anchorterminal.com/compare/numeral-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" } ], "scores": [ { "by": 48, "edge": "kintsugi", "key": "reliability", "kintsugi": 73, "name": "Reliability", "numeral": 25, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 0, "edge": "", "key": "schema", "kintsugi": 87, "name": "Schema \u0026 documentation", "numeral": 87, "weight": 13 }, { "by": 4, "edge": "kintsugi", "key": "ergonomics", "kintsugi": 75, "name": "Agent ergonomics", "numeral": 71, "weight": 13 }, { "by": 5, "edge": "kintsugi", "key": "security", "kintsugi": 52, "name": "Security \u0026 auth", "numeral": 47, "weight": 14 }, { "by": 3, "edge": "kintsugi", "key": "payments", "kintsugi": 13, "name": "Payments \u0026 pricing", "numeral": 10, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 18, "edge": "kintsugi", "key": "maintenance", "kintsugi": 78, "name": "Maintenance \u0026 community", "numeral": 60, "weight": 7 }, { "by": 15, "edge": "kintsugi", "key": "transparency", "kintsugi": 60, "name": "Transparency \u0026 trust", "numeral": 45, "weight": 7 } ], "summary": "Kintsugi scores 60.7 (C) on agent readiness against Numeral's 49.3 (D), and leads in 6 of 7 scored categories. 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.", "numeral": "Docs are written for agents, with a public OpenAPI spec for 32 operations, Markdown pages, llms.txt and a remote MCP server whose 14 tools are read-only by default. No status page, numeric rate limit or SLA was found, the API ignores idempotency keys, and API access is sold on a custom plan after a demo." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/kintsugi-vs-numeral", "json": "https://www.anchorterminal.com/compare/kintsugi-vs-numeral.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/kintsugi-vs-numeral.md", "slim": "https://www.anchorterminal.com/compare/kintsugi-vs-numeral.min.md" }, "markdown": "Kintsugi scores 60.7 (C) on agent readiness against Numeral's 49.3 (D), and leads in 6 of 7 scored categories. 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- Numeral: grade D, 49.3/100, rank #611 of 722. Markdown https://www.anchorterminal.com/tools/numeral.md · JSON https://www.anchorterminal.com/api/v1/tools/numeral.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- Reliability, 73 against 25\n- Security \u0026 auth, 52 against 47\n- Maintenance \u0026 community, 78 against 60\n- Transparency \u0026 trust, 60 against 45\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### Numeral (D)\n\nGood for: An agent working for a seller or platform that has a Numeral account and needs tax at checkout, committed transactions for filing, and read access to nexus, registrations and filings through MCP.\n\nAlso in its favour:\n- No incidents deducted, where Kintsugi loses 3 points for them\n\nWatch for: No status page, uptime SLA or numeric rate limit was found. The product page says rate limits can be removed on request\n\n\n## Score by category\n\n| Category | Weight | Kintsugi | Numeral | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 73 | 25 | Kintsugi +48 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 87 | 87 | even |\n| Agent ergonomics | 13% (16.2 this run) | 75 | 71 | Kintsugi +4 |\n| Security \u0026 auth | 14% (17.5 this run) | 52 | 47 | Kintsugi +5 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 13 | 10 | Kintsugi +3 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 78 | 60 | Kintsugi +18 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 60 | 45 | Kintsugi +15 |\n| Negative events | ≤15 | -3 | 0 | |\n| **Total** | | **60.7 · C** | **49.3 · D** | |\n\n## Facts side by side\n\n| Fact | Kintsugi | Numeral |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Kintsugi AI, Inc. | Numeral Two, Inc. |\n| Hosted endpoint | `https://api.trykintsugi.com` | `https://api.numeralhq.com` |\n| Transports | HTTP, Streamable HTTP | HTTP, Streamable 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 Numeral's terms of service. The Go, Python and Node SDKs are Apache-2.0 |\n| Tools exposed | 55 | 14 |\n| Read-only variant documented | yes | yes |\n| llms.txt | yes | yes |\n| Last release | 2026-10-07 | 2026-09-15 |\n| Terms last updated | 2026-09-29 | no date given |\n| Privacy policy last updated | 2025-04-13 | no document linked |\n| Customer content may train models | yes | not found in the text |\n| Terms restrict automated access | yes | not found in the text |\n| Terms restrict benchmarking | yes | not found in the text |\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 | yes |\n| Popularity | 71 npm/wk, 10 PyPI/wk | 0 stars, 9 npm/wk, 19 PyPI/wk |\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**Numeral.** Docs are written for agents, with a public OpenAPI spec for 32 operations, Markdown pages, llms.txt and a remote MCP server whose 14 tools are read-only by default. No status page, numeric rate limit or SLA was found, the API ignores idempotency keys, and API access is sold on a custom plan after a demo.\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### Numeral\n\n1. Send `X-API-Version: 2026-03-01` on every call to `https://api.numeralhq.com`. Merchant, platform and certificate endpoints reject requests without it\n2. Commit with a stable `reference_order_id`. On `REFERENCE_ORDER_ID_ALREADY_EXISTS` look up the existing transaction, because `Idempotency-Key` is ignored\n3. Commit before the calculation's `expires_at`. If it has expired, calculate again and commit the new `calculation_id` with the original `reference_order_id`\n4. Send `amount` as the line total in minor units to `/tax/calculations` and as the per-unit price to `/tax/platform/calculations`\n5. Start with an `sk_test_` key. Certificate endpoints and MCP certificate tools are live only and answer `TESTMODE_NOT_SUPPORTED` or `live_mode_required`\n\n## Questions\n\n### Which is better for AI agents, Kintsugi or Numeral?\n\nKintsugi scores 60.7 (C) on agent readiness against Numeral's 49.3 (D), and leads in 6 of 7 scored categories.\n\n### Do Kintsugi and Numeral need an API key?\n\nKintsugi takes an API key or an OAuth sign-in. Numeral needs an API key.\n\n### Can an agent call Kintsugi and Numeral without installing anything?\n\nYes. Kintsugi has a hosted endpoint at https://api.trykintsugi.com and Numeral at https://api.numeralhq.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/kintsugi-vs-numeral.json, and with the fewest tokens: https://www.anchorterminal.com/compare/kintsugi-vs-numeral.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"kintsugi\", \"b\": \"numeral\"}`. From a terminal: `anchor compare kintsugi numeral`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/kintsugi.json and https://www.anchorterminal.com/api/v1/tools/numeral.json\n\n## Other comparisons with Kintsugi or Numeral\n\n- [Anrok vs Kintsugi](https://www.anchorterminal.com/compare/anrok-vs-kintsugi.md)\n- [Anrok vs Numeral](https://www.anchorterminal.com/compare/anrok-vs-numeral.md)\n- [Avalara AvaTax vs Kintsugi](https://www.anchorterminal.com/compare/avalara-vs-kintsugi.md)\n- [Avalara AvaTax vs Numeral](https://www.anchorterminal.com/compare/avalara-vs-numeral.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- [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- [Kintsugi vs Zamp](https://www.anchorterminal.com/compare/kintsugi-vs-zamp.md)\n- [Numeral vs Quaderno](https://www.anchorterminal.com/compare/numeral-vs-quaderno.md)\n- [Numeral vs TaxCloud](https://www.anchorterminal.com/compare/numeral-vs-taxcloud.md)\n- [Numeral vs TaxJar](https://www.anchorterminal.com/compare/numeral-vs-taxjar.md)\n- [Numeral vs Vertex O Series](https://www.anchorterminal.com/compare/numeral-vs-vertex-tax.md)\n- [Numeral vs Zamp](https://www.anchorterminal.com/compare/numeral-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 Numeral", "url": "" } ], "description": "Kintsugi scores 60.7 (C) on agent readiness against Numeral's 49.3 (D), and leads in 6 of 7 scored categories. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Kintsugi C 60.7", "Numeral D 49.3", "scores" ], "h1": "Kintsugi vs Numeral", "image": "https://www.anchorterminal.com/assets/og/compare-kintsugi-vs-numeral.png", "path": "/compare/kintsugi-vs-numeral", "published": "2026-10-01", "section": "tools", "title": "Kintsugi vs Numeral for AI agents, C 60.7 vs D 49.3 | Anchor Terminal", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-numeral" }, "tokens": { "markdown": 2250, "slim": 680 }, "version": 1 }