{ "data": { "a": { "slug": "taxjar", "name": "TaxJar", "vendor": "TaxJar (Stripe)", "vendorUrl": "https://www.taxjar.com", "kind": "http-api", "category": "tax", "summary": "TaxJar is Stripe's US sales tax service for businesses that sell across states. Its REST API calculates tax for an order, looks up rates by address, records orders and refunds for reporting, and stores exempt customers.", "url": "https://www.anchorterminal.com/tools/taxjar", "markdownUrl": "https://www.anchorterminal.com/tools/taxjar.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/taxjar.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/taxjar.json", "repo": "https://github.com/taxjar/taxjar-node", "license": "Proprietary service under TaxJar's terms of service and API licence agreement. The official API clients on GitHub are MIT", "transports": [ "http" ], "remoteUrl": "https://api.taxjar.com/v2", "packages": [ { "registry": "npm", "name": "taxjar" }, { "registry": "pypi", "name": "taxjar" } ], "auth": "api-key", "authNotes": "A self-serve API token, generated by a signed-in user at Account \u003e TaxJar API in the web app and sent as `Authorization: Bearer \u003ctoken\u003e`. The token has no scopes and covers every endpoint for that account, deletes included. API access needs the Professional plan or the 30-day trial. The sandbox takes its own token. No OAuth, app review or partner approval applies.", "pricing": "paid", "pricingNotes": "The API needs the Professional plan, from $99 a month at 200 orders, with higher order tiers on a selector. Each calculation or rate lookup counts as a tenth of an order, errors included. A 30-day trial with API access needs no card, so an agent's owner can start without a contract. The sandbox comes with Professional plans (checked 2026-10-08).", "priceSummary": "$99 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the API reference, the API guides or the pricing page (checked 2026-10-08).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 57, "npmWeekly": 95036, "pypiWeekly": 49713, "asOf": "2026-10-08" }, "docsUrl": "https://developers.taxjar.com/api/reference/", "capabilities": [ "tax.calculate", "tax.transactions", "tax.exemptions", "shipping.address-validation" ], "tags": [ "hosted", "closed-source", "api-key", "sandbox", "no-card", "python", "typescript", "ruby", "php", "java", "go", "dotnet", "status-page", "soc2" ], "lastRelease": "2026-09-02", "graded": true, "anchor": { "graded": true, "score": 57.6, "grade": "C", "agentReady": false, "rank": 417, "ranked": true, "rankOf": 629, "categoryRank": 4, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 61, "maintenance": 64, "payments": 30, "reliability": 84, "schema": 48, "security": 43, "transparency": 71 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "A 21-operation REST API with a no-card 30-day trial, caller-chosen transaction IDs that make order pushes safe to repeat, and no status-page incident since March 2026. No OpenAPI spec or llms.txt was found, the API changelog stops at January 2022, tokens carry no scopes, and calculation is US-only for new accounts.", "bestFor": "An agent working for a US seller that needs sales tax on an order at checkout and a record of orders and refunds for state reporting, with exempt customers handled by ID.", "strengths": [ "30-day trial with Professional plan access, the API included, and no card needed at signup", "Orders and refunds take a caller-chosen `transaction_id`. A duplicate create returns 422 and the docs direct a PUT update", "status.taxjar.com lists seven components and no incident since 26 March 2026", "Rate limits published as 10,000 requests a minute on Professional and 25,000 on Premium", "Official clients for seven languages. The Node client reached 5.0.0 on npm on 2 September 2026 and .NET 5.0.0 on NuGet on 4 August 2026" ], "weaknesses": [ "No OpenAPI spec or llms.txt was found. The taxjar/openapi repository on GitHub holds only a README", "The API changelog's last entry is 24 January 2022, and no deprecation policy was found", "Calculation covers the United States only for new accounts. The docs point other countries to Stripe Tax", "API tokens carry no scopes or read-only mode, and the same token can delete transactions and customers", "Calls that return an error still count as a tenth of an order against the plan, per the help centre" ], "agentNotes": [ "Send `x-api-version: 2022-01-24` on every call. Accounts opened before 3 February 2022 default to an older version with weaker validation", "Pass `nexus_addresses[]` or keep nexus states in the account. Without nexus the API returns zero tax and reports no error", "Create orders with your own `transaction_id`. On 422 the order already exists, so send a PUT to update it", "Post JSON with `Content-Type: application/json`. Form-encoded arrays such as `line_items[]` can return 406", "Cache calculations and skip states without nexus. Each calculation or rate lookup counts as a tenth of an order, errors included" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 57.6 } ], "editorialScores": { "ergonomics": 61, "maintenance": 64, "payments": 30, "reliability": 84, "schema": 48, "security": 43, "transparency": 55 }, "provenanceScore": 87 }, "connect": { "install": "npm install taxjar", "http": "curl https://api.taxjar.com/v2/categories \\\n -H \"Authorization: Bearer ${TAXJAR_API_KEY}\"" }, "letme": { "capability": "https://letme.dev/tax.calculate", "tool": "https://letme.dev/taxjar" }, "area": "domain-data", "unitPrices": [ { "item": "Professional, 200 orders a month", "unit": "month", "usd": 99, "note": "the plan with API access; a calculation or rate lookup counts as a tenth of an order" }, { "item": "Professional, 500 orders a month", "unit": "month", "usd": 249, "note": "per the flex fee article" }, { "item": "Professional, 1,000 orders a month", "unit": "month", "usd": 499, "note": "per the flex fee article" }, { "item": "Starter, 200 orders a month", "unit": "month", "usd": 39, "note": "no API access" }, { "item": "AutoFile return beyond included credits, Professional", "unit": "tx", "usd": 55, "note": "four credits a year included; $50 on Starter" } ], "provenance": { "legalEntity": "TPS Unlimited, Inc. (d/b/a TaxJar, a wholly owned subsidiary of Stripe, Inc.)", "domain": "taxjar.com", "domainRegistered": "2012-03-02", "endpointOnVendorDomain": true, "terms": "https://www.taxjar.com/terms-of-service", "privacy": "https://www.taxjar.com/privacy", "statusPage": "https://status.taxjar.com", "changelog": "https://developers.taxjar.com/api/reference/#changelog", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The terms of service and the API licence agreement on the same page (last updated 14 May 2026) are with TPS Unlimited, Inc. d/b/a TaxJar. The data processing agreement of the same date calls it a wholly owned subsidiary of Stripe, Inc.", "The privacy policy (last updated 7 January 2022) gives TPS Unlimited, Inc., 462 Washington St. #3066, Woburn, Massachusetts 01888, and adds (A Stripe Company). The about page says Stripe acquired TaxJar in 2021.", "Stripe is listed separately on Anchor Terminal. TaxJar keeps its own API, account system, terms and status page, and its sub-processor list names Stripe, LLC and affiliates for billing.", "The API host is api.taxjar.com and the sandbox api.sandbox.taxjar.com. RDAP gives a registration date of 2012-03-02 for taxjar.com, with Com Laude as registrar.", "www.taxjar.com/.well-known/security.txt and api.taxjar.com/.well-known/security.txt return 404. stripe.com serves a valid security.txt that points to HackerOne, and we didn't establish whether that programme covers TaxJar hosts.", "The changelog is a section of the API reference page, and its newest entry is dated 24 January 2022." ], "score": 87 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/taxjar.json", "live": { "slug": "taxjar", "probe": { "target": "https://api.taxjar.com/v2", "method": "get", "lastAt": "2026-10-08T19:09:00.028246346Z", "lastOk": true, "lastStatus": 404, "lastMs": 280, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 263, "p95ms24h": 292, "samples24h": 42, "samples30d": 42, "days": [ { "date": "2026-10-08", "probes": 42, "ok": 42 } ] }, "vendorStatus": { "page": "https://status.taxjar.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T19:07:01.407121094Z" }, "versions": [ { "registry": "github", "name": "taxjar/taxjar-node", "version": "v5.0.0", "released": "2026-02-03", "seenAt": "2026-10-08T16:31:32.062161715Z" }, { "registry": "npm", "name": "taxjar", "version": "5.0.0", "seenAt": "2026-10-08T16:31:31.016239944Z" }, { "registry": "pypi", "name": "taxjar", "version": "2.0.1", "released": "2025-04-14", "seenAt": "2026-10-08T16:31:31.869241068Z" } ], "githubStars": 57, "npmWeekly": 95036, "pypiWeekly": 49713, "securityTxt": { "url": "https://taxjar.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-08T15:39:06.776426979Z" }, "pages": [ { "url": "https://developers.taxjar.com/api/reference/", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:18:03.269696625Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "fb0fe884536c" }, { "url": "https://www.taxjar.com/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-08T18:30:56.737296724Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "b22cd1da61e7" }, { "url": "https://www.taxjar.com/terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-10-08T18:30:59.304705205Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7e694d9c9de5" } ], "updatedAt": "2026-10-08T19:09:00.028246346Z" } }, "answer": "TaxJar scores 57.6 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on schema \u0026 documentation and security \u0026 auth.", "b": { "slug": "vertex-tax", "name": "Vertex O Series", "vendor": "Vertex, Inc.", "vendorUrl": "https://www.vertexinc.com", "kind": "http-api", "category": "tax", "summary": "Vertex O Series is indirect tax software from Vertex, Inc. that calculates sales tax, use tax and VAT for a transaction and records it for reporting. Agents reach it through REST v2 APIs with OAuth client credentials.", "url": "https://www.anchorterminal.com/tools/vertex-tax", "markdownUrl": "https://www.anchorterminal.com/tools/vertex-tax.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/vertex-tax.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/vertex-tax.json", "license": "Proprietary service under a customer agreement with Vertex, Inc. that isn't published", "transports": [ "http" ], "remoteUrl": "https://calcconnect.vertexsmb.com/vertex-ws/v2", "packages": [], "auth": "oauth", "authNotes": "Access is granted through a sales contract. OAuth 2.0 client credentials follow. A Cloud Partition System Administrator creates an API credential under Account Settings, Security \u0026 Credentials, choosing the API and the partition it maps to. The client id and secret are exchanged at https://auth.vertexcloud.com/oauth/token with audience `verx://migration-api` for a bearer token that lasts 3,599 seconds. The secret is shown once and a credential can't be edited. Token requests are limited to 10 per 8 hours, and a caching endpoint at tokenguard.vertexcloud.com returns unexpired tokens. On-Premise and On-Demand deployments use a service account with the API User role and their own token URL.", "pricing": "paid", "pricingNotes": "No public prices. www.vertexinc.com/pricing returns 404 and the O Series product page asks visitors to book a demo. No free tier, trial or self-serve sandbox was found, and the security guide says to work with the Vertex sales team to establish an account. O Series Online Commerce documents a sandbox host that uses the same contracted credentials (checked 2026-10-08).", "priceSummary": "Paid", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the developer docs or the OpenAPI specs (checked 2026-10-08).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-08" }, "docsUrl": "https://developer.vertexinc.com/oseries/docs/quick-start", "openapi": "https://developer.vertexinc.com/oseries/openapi/vertex-tax-calculation-and-tax-gis-api.json", "capabilities": [ "tax.calculate", "tax.transactions", "tax.exemptions", "tax.invoicing" ], "tags": [ "hosted", "enterprise", "oauth", "openapi", "sales-led", "status-page", "soc2", "on-premise", "vat", "sales-tax" ], "lastRelease": "2026-09-25", "graded": true, "anchor": { "graded": true, "score": 54.7, "grade": "C", "agentReady": false, "rank": 464, "ranked": true, "rankOf": 629, "categoryRank": 5, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 51, "maintenance": 62, "payments": 0, "reliability": 65, "schema": 74, "security": 57, "transparency": 68 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "Public OpenAPI 3.0 specs cover calculation, transaction management, tax area lookup and tax configuration, and guides are served as Markdown. Access needs a sales contract. No price, free tier, sandbox signup, calculation rate limit, idempotency key or official SDK was found in the reviewed documentation.", "bestFor": "An agent working inside a company that already has an O Series licence, for quotes, invoice tax, tax area lookups and tax configuration across sales tax, use tax and VAT.", "strengths": [ "OpenAPI 3.0 specs download without a login. Calculation and Tax GIS is version 2.9.0 with 14 operations, Tax Configuration v2.1.0 with 29", "Every guide page is served as Markdown when .md is added to its URL", "Each Cloud API credential maps to one API and one partition, and token requests carrying credentials in the URL are rejected", "status.vertexinc.com lists 26 components, and no incident from 10 July to 8 October 2026 names O Series Cloud", "The trust centre lists SOC 1 Type II and SOC 2 Type II reports for 2025 and five sub-processors with locations" ], "weaknesses": [ "No public price, free tier or self-serve signup. The security guide sends new users to the Vertex sales team for an account", "No rate limit for the calculation API and no idempotency key were found in the reviewed documentation", "The standard token endpoint allows 10 access token requests per 8 hours for each client", "No official SDK, MCP server or llms.txt on the developer site was found", "The customer agreement, DPA and Service Level Exhibit sit behind an access request in the trust centre" ], "agentNotes": [ "Cache the access token for its 3,599-second life. The standard token endpoint allows 10 requests per 8 hours, and tokenguard.vertexcloud.com returns a cached token", "Send no `Authorization: Bearer` header to /oauth/token, and put the client id and secret in the body or a Basic header. Credentials in the URL are rejected", "Set `saleMessageType` to QUOTATION for an estimate. INVOICE is stored for reporting and remittance", "Call GET /v2/transaction-exists/{transactionid} before retrying a failed INVOICE. No idempotency key is documented", "Delete, reverse or roll back a Cloud transaction within 90 days of calculation. Later requests can cause calculation errors or duplicates" ], "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": 54.7 } ], "editorialScores": { "ergonomics": 51, "maintenance": 62, "payments": 0, "reliability": 65, "schema": 74, "security": 57, "transparency": 52 }, "provenanceScore": 84 }, "connect": { "http": "curl --location 'https://auth.vertexcloud.com/oauth/token' \\\n --header 'Content-Type: application/x-www-form-urlencoded' \\\n --data-urlencode 'client_id=\u003cyour-client-id\u003e' \\\n --data-urlencode 'client_secret=\u003cyour-client-secret\u003e' \\\n --data-urlencode 'audience=verx://migration-api' \\\n --data-urlencode 'grant_type=client_credentials'" }, "letme": { "capability": "https://letme.dev/tax.calculate", "tool": "https://letme.dev/vertex-tax" }, "area": "domain-data", "provenance": { "legalEntity": "Vertex, Inc.", "domain": "vertexinc.com", "domainRegistered": "1998-09-01", "endpointOnVendorDomain": true, "terms": "https://www.vertexinc.com/terms-of-use", "privacy": "https://www.vertexinc.com/vertex-privacy-policy", "statusPage": "https://status.vertexinc.com", "changelog": "https://developer.vertexinc.com/oseries/docs/os-release", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The website terms of use and the privacy notice name Vertex, Inc., 2301 Renaissance Blvd., King of Prussia, PA 19406, and the terms choose Pennsylvania law. The privacy notice was last updated on 19 August 2026.", "Cloud API calls go to calcconnect.vertexsmb.com and auth.vertexcloud.com, which the vendor's developer docs name as its hosts. We didn't check the registration of those two domains. On-Demand deployments answer on \u003ccustomer\u003e.ondemand.vertexinc.com.", "www.vertexinc.com/.well-known/security.txt and /security.txt return 404.", "The terms URL is the website terms of use. The customer agreement, DPA, Security Exhibit and Service Level Exhibit are listed in the trust centre behind an access request.", "RDAP for vertexinc.com gives a registration date of 1998-09-01." ], "score": 84 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/vertex-tax.json", "live": { "slug": "vertex-tax", "probe": { "target": "https://calcconnect.vertexsmb.com/vertex-ws/v2", "method": "get", "lastAt": "2026-10-08T19:09:01.550123634Z", "lastOk": true, "lastStatus": 401, "lastMs": 328, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 337, "p95ms24h": 389, "samples24h": 42, "samples30d": 42, "days": [ { "date": "2026-10-08", "probes": 42, "ok": 42 } ] }, "vendorStatus": { "page": "https://status.vertexinc.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T19:07:03.755128847Z" }, "securityTxt": { "url": "https://vertexinc.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-08T15:38:42.909167355Z" }, "pages": [ { "url": "https://developer.vertexinc.com/oseries/docs/os-release", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:17:20.759088603Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "dbf33e43de24" }, { "url": "https://www.vertexinc.com/vertex-privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-08T18:31:23.444238352Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "a77bfa05dfc0" }, { "url": "https://www.vertexinc.com/terms-of-use", "kind": "terms", "status": 200, "checkedAt": "2026-10-08T18:31:21.326104819Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "8a38170a4aef" } ], "updatedAt": "2026-10-08T19:09:01.550123634Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "TaxJar (Stripe)", "b": "Vertex, Inc.", "name": "Vendor" }, { "a": "https://api.taxjar.com/v2", "b": "https://calcconnect.vertexsmb.com/vertex-ws/v2", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "OAuth", "name": "Auth" }, { "a": "Paid", "b": "Paid", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under TaxJar's terms of service and API licence agreement. The official API clients on GitHub are MIT", "b": "Proprietary service under a customer agreement with Vertex, Inc. that isn't published", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "no", "name": "llms.txt" }, { "a": "2026-09-02", "b": "2026-09-25", "name": "Last release" }, { "a": "2026-05-14", "b": "no date given", "name": "Terms last updated" }, { "a": "2022-01-07", "b": "no date given", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "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": "not found in the text", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "57 stars, 95k npm/wk, 50k PyPI/wk", "b": "none", "name": "Popularity" } ], "faq": [ { "answer": "TaxJar scores 57.6 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on schema \u0026 documentation and security \u0026 auth.", "question": "Which is better for AI agents, TaxJar or Vertex O Series?" }, { "answer": "TaxJar needs an API key. Vertex O Series uses an OAuth sign-in.", "question": "Do TaxJar and Vertex O Series need an API key?" }, { "answer": "Yes. TaxJar has a hosted endpoint at https://api.taxjar.com/v2 and Vertex O Series at https://calcconnect.vertexsmb.com/vertex-ws/v2.", "question": "Can an agent call TaxJar and Vertex O Series without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 84 against 65", "Agent ergonomics, 61 against 51", "Payments \u0026 pricing, 30 against 0" ], "also": [ "Free to start without a card" ], "goodFor": "An agent working for a US seller that needs sales tax on an order at checkout and a record of orders and refunds for state reporting, with exempt customers handled by ID.", "slug": "taxjar", "watchFor": "No OpenAPI spec or llms.txt was found. The taxjar/openapi repository on GitHub holds only a README" }, { "aheadOn": [ "Schema \u0026 documentation, 74 against 48", "Security \u0026 auth, 57 against 43" ], "also": null, "goodFor": "An agent working inside a company that already has an O Series licence, for quotes, invoice tax, tax area lookups and tax configuration across sales tax, use tax and VAT.", "slug": "vertex-tax", "watchFor": "No public price, free tier or self-serve signup. The security guide sends new users to the Vertex sales team for an account" } ], "job": { "capability": "tax.calculate", "name": "Tax calculate" }, "others": [ { "json": "https://www.anchorterminal.com/compare/anrok-vs-taxjar.json", "title": "Anrok vs TaxJar", "url": "https://www.anchorterminal.com/compare/anrok-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/anrok-vs-vertex-tax.json", "title": "Anrok vs Vertex O Series", "url": "https://www.anchorterminal.com/compare/anrok-vs-vertex-tax" }, { "json": "https://www.anchorterminal.com/compare/avalara-vs-taxjar.json", "title": "Avalara AvaTax vs TaxJar", "url": "https://www.anchorterminal.com/compare/avalara-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/avalara-vs-vertex-tax.json", "title": "Avalara AvaTax vs Vertex O Series", "url": "https://www.anchorterminal.com/compare/avalara-vs-vertex-tax" }, { "json": "https://www.anchorterminal.com/compare/quaderno-vs-taxjar.json", "title": "Quaderno vs TaxJar", "url": "https://www.anchorterminal.com/compare/quaderno-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/quaderno-vs-vertex-tax.json", "title": "Quaderno vs Vertex O Series", "url": "https://www.anchorterminal.com/compare/quaderno-vs-vertex-tax" } ], "scores": [ { "by": 19, "edge": "taxjar", "key": "reliability", "name": "Reliability", "taxjar": 84, "vertex-tax": 65, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 26, "edge": "vertex-tax", "key": "schema", "name": "Schema \u0026 documentation", "taxjar": 48, "vertex-tax": 74, "weight": 13 }, { "by": 10, "edge": "taxjar", "key": "ergonomics", "name": "Agent ergonomics", "taxjar": 61, "vertex-tax": 51, "weight": 13 }, { "by": 14, "edge": "vertex-tax", "key": "security", "name": "Security \u0026 auth", "taxjar": 43, "vertex-tax": 57, "weight": 14 }, { "by": 30, "edge": "taxjar", "key": "payments", "name": "Payments \u0026 pricing", "taxjar": 30, "vertex-tax": 0, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 2, "edge": "taxjar", "key": "maintenance", "name": "Maintenance \u0026 community", "taxjar": 64, "vertex-tax": 62, "weight": 7 }, { "by": 3, "edge": "taxjar", "key": "transparency", "name": "Transparency \u0026 trust", "taxjar": 71, "vertex-tax": 68, "weight": 7 } ], "summary": "TaxJar scores 57.6 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on schema \u0026 documentation and security \u0026 auth. Both do tax calculate.", "verdicts": { "taxjar": "A 21-operation REST API with a no-card 30-day trial, caller-chosen transaction IDs that make order pushes safe to repeat, and no status-page incident since March 2026. No OpenAPI spec or llms.txt was found, the API changelog stops at January 2022, tokens carry no scopes, and calculation is US-only for new accounts.", "vertex-tax": "Public OpenAPI 3.0 specs cover calculation, transaction management, tax area lookup and tax configuration, and guides are served as Markdown. Access needs a sales contract. No price, free tier, sandbox signup, calculation rate limit, idempotency key or official SDK was found in the reviewed documentation." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax", "json": "https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax.md", "slim": "https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax.min.md" }, "markdown": "TaxJar scores 57.6 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on schema \u0026 documentation and security \u0026 auth. Both do tax calculate.\n\n- TaxJar: grade C, 57.6/100, rank #417 of 629. Markdown https://www.anchorterminal.com/tools/taxjar.md · JSON https://www.anchorterminal.com/api/v1/tools/taxjar.json\n- Vertex O Series: grade C, 54.7/100, rank #464 of 629. Markdown https://www.anchorterminal.com/tools/vertex-tax.md · JSON https://www.anchorterminal.com/api/v1/tools/vertex-tax.json\n\n## Which one, for what\n\n### TaxJar (C)\n\nGood for: An agent working for a US seller that needs sales tax on an order at checkout and a record of orders and refunds for state reporting, with exempt customers handled by ID.\n\nAhead on:\n- Reliability, 84 against 65\n- Agent ergonomics, 61 against 51\n- Payments \u0026 pricing, 30 against 0\n\nAlso in its favour:\n- Free to start without a card\n\nWatch for: No OpenAPI spec or llms.txt was found. The taxjar/openapi repository on GitHub holds only a README\n\n### Vertex O Series (C)\n\nGood for: An agent working inside a company that already has an O Series licence, for quotes, invoice tax, tax area lookups and tax configuration across sales tax, use tax and VAT.\n\nAhead on:\n- Schema \u0026 documentation, 74 against 48\n- Security \u0026 auth, 57 against 43\n\nWatch for: No public price, free tier or self-serve signup. The security guide sends new users to the Vertex sales team for an account\n\n\n## Score by category\n\n| Category | Weight | TaxJar | Vertex O Series | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 84 | 65 | TaxJar +19 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 48 | 74 | Vertex O Series +26 |\n| Agent ergonomics | 13% (16.2 this run) | 61 | 51 | TaxJar +10 |\n| Security \u0026 auth | 14% (17.5 this run) | 43 | 57 | Vertex O Series +14 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 0 | TaxJar +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 64 | 62 | TaxJar +2 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 71 | 68 | TaxJar +3 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **57.6 · C** | **54.7 · C** | |\n\n## Facts side by side\n\n| Fact | TaxJar | Vertex O Series |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | TaxJar (Stripe) | Vertex, Inc. |\n| Hosted endpoint | `https://api.taxjar.com/v2` | `https://calcconnect.vertexsmb.com/vertex-ws/v2` |\n| Transports | HTTP | HTTP |\n| Auth | API key | OAuth |\n| Pricing | Paid | Paid |\n| x402 | no | no |\n| Licence | Proprietary service under TaxJar's terms of service and API licence agreement. The official API clients on GitHub are MIT | Proprietary service under a customer agreement with Vertex, Inc. that isn't published |\n| Read-only variant documented | no | no |\n| llms.txt | no | no |\n| Last release | 2026-09-02 | 2026-09-25 |\n| Terms last updated | 2026-05-14 | no date given |\n| Privacy policy last updated | 2022-01-07 | no date given |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | 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 | not found in the text | not found in the text |\n| Popularity | 57 stars, 95k npm/wk, 50k PyPI/wk | none |\n\n## Verdicts\n\n**TaxJar.** A 21-operation REST API with a no-card 30-day trial, caller-chosen transaction IDs that make order pushes safe to repeat, and no status-page incident since March 2026. No OpenAPI spec or llms.txt was found, the API changelog stops at January 2022, tokens carry no scopes, and calculation is US-only for new accounts.\n\n**Vertex O Series.** Public OpenAPI 3.0 specs cover calculation, transaction management, tax area lookup and tax configuration, and guides are served as Markdown. Access needs a sales contract. No price, free tier, sandbox signup, calculation rate limit, idempotency key or official SDK was found in the reviewed documentation.\n\n## Before you call either\n\n### TaxJar\n\n1. Send `x-api-version: 2022-01-24` on every call. Accounts opened before 3 February 2022 default to an older version with weaker validation\n2. Pass `nexus_addresses[]` or keep nexus states in the account. Without nexus the API returns zero tax and reports no error\n3. Create orders with your own `transaction_id`. On 422 the order already exists, so send a PUT to update it\n4. Post JSON with `Content-Type: application/json`. Form-encoded arrays such as `line_items[]` can return 406\n5. Cache calculations and skip states without nexus. Each calculation or rate lookup counts as a tenth of an order, errors included\n\n### Vertex O Series\n\n1. Cache the access token for its 3,599-second life. The standard token endpoint allows 10 requests per 8 hours, and tokenguard.vertexcloud.com returns a cached token\n2. Send no `Authorization: Bearer` header to /oauth/token, and put the client id and secret in the body or a Basic header. Credentials in the URL are rejected\n3. Set `saleMessageType` to QUOTATION for an estimate. INVOICE is stored for reporting and remittance\n4. Call GET /v2/transaction-exists/{transactionid} before retrying a failed INVOICE. No idempotency key is documented\n5. Delete, reverse or roll back a Cloud transaction within 90 days of calculation. Later requests can cause calculation errors or duplicates\n\n## Questions\n\n### Which is better for AI agents, TaxJar or Vertex O Series?\n\nTaxJar scores 57.6 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on schema \u0026 documentation and security \u0026 auth.\n\n### Do TaxJar and Vertex O Series need an API key?\n\nTaxJar needs an API key. Vertex O Series uses an OAuth sign-in.\n\n### Can an agent call TaxJar and Vertex O Series without installing anything?\n\nYes. TaxJar has a hosted endpoint at https://api.taxjar.com/v2 and Vertex O Series at https://calcconnect.vertexsmb.com/vertex-ws/v2.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax.json, and with the fewest tokens: https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"taxjar\", \"b\": \"vertex-tax\"}`. From a terminal: `anchor compare taxjar vertex-tax`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/taxjar.json and https://www.anchorterminal.com/api/v1/tools/vertex-tax.json\n\n## Other comparisons with TaxJar or Vertex O Series\n\n- [Anrok vs TaxJar](https://www.anchorterminal.com/compare/anrok-vs-taxjar.md)\n- [Anrok vs Vertex O Series](https://www.anchorterminal.com/compare/anrok-vs-vertex-tax.md)\n- [Avalara AvaTax vs TaxJar](https://www.anchorterminal.com/compare/avalara-vs-taxjar.md)\n- [Avalara AvaTax vs Vertex O Series](https://www.anchorterminal.com/compare/avalara-vs-vertex-tax.md)\n- [Quaderno vs TaxJar](https://www.anchorterminal.com/compare/quaderno-vs-taxjar.md)\n- [Quaderno vs Vertex O Series](https://www.anchorterminal.com/compare/quaderno-vs-vertex-tax.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": "TaxJar vs Vertex O Series", "url": "" } ], "description": "TaxJar scores 57.6 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on schema \u0026 documentation and security \u0026 auth. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "TaxJar C 57.6", "Vertex O Series C 54.7", "scores" ], "h1": "TaxJar vs Vertex O Series", "image": "https://www.anchorterminal.com/assets/og/compare-taxjar-vs-vertex-tax.png", "path": "/compare/taxjar-vs-vertex-tax", "published": "2026-10-01", "section": "tools", "title": "TaxJar vs Vertex O Series for AI agents, C 57.6 vs C 54.7", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax" }, "tokens": { "markdown": 2000, "slim": 630 }, "version": 1 }