{ "data": { "a": { "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" } }, "answer": "TaxJar scores 57.6 (C) on agent readiness against Numeral's 49.3 (D), and leads in 4 of 7 scored categories. Numeral leads on schema \u0026 documentation and agent ergonomics.", "b": { "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": 470, "ranked": true, "rankOf": 722, "categoryRank": 5, "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": "2026-10-08T21:12:23.094069908Z", "lastOk": true, "lastStatus": 404, "lastMs": 257, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 263, "p95ms24h": 331, "samples24h": 64, "samples30d": 64, "days": [ { "date": "2026-10-08", "probes": 64, "ok": 64 } ] }, "vendorStatus": { "page": "https://status.taxjar.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T21:06:27.799265086Z" }, "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": "2026-10-08T21:12:23.094069908Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Numeral Two, Inc.", "b": "TaxJar (Stripe)", "name": "Vendor" }, { "a": "https://api.numeralhq.com", "b": "https://api.taxjar.com/v2", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Paid", "b": "Paid", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under Numeral's terms of service. The Go, Python and Node SDKs are Apache-2.0", "b": "Proprietary service under TaxJar's terms of service and API licence agreement. The official API clients on GitHub are MIT", "name": "Licence" }, { "a": "14", "b": "none", "name": "Tools exposed" }, { "a": "yes", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "no", "name": "llms.txt" }, { "a": "2026-09-15", "b": "2026-09-02", "name": "Last release" }, { "a": "no date given", "b": "2026-05-14", "name": "Terms last updated" }, { "a": "no document linked", "b": "2022-01-07", "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": "not found in the text", "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": "0 stars, 9 npm/wk, 19 PyPI/wk", "b": "57 stars, 95k npm/wk, 50k PyPI/wk", "name": "Popularity" } ], "faq": [ { "answer": "TaxJar scores 57.6 (C) on agent readiness against Numeral's 49.3 (D), and leads in 4 of 7 scored categories. Numeral leads on schema \u0026 documentation and agent ergonomics.", "question": "Which is better for AI agents, Numeral or TaxJar?" }, { "answer": "Both need an API key.", "question": "Do Numeral and TaxJar need an API key?" }, { "answer": "Yes. Numeral has a hosted endpoint at https://api.numeralhq.com and TaxJar at https://api.taxjar.com/v2.", "question": "Can an agent call Numeral and TaxJar without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 87 against 48", "Agent ergonomics, 71 against 61" ], "also": null, "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" }, { "aheadOn": [ "Reliability, 84 against 25", "Payments \u0026 pricing, 30 against 10", "Transparency \u0026 trust, 71 against 45" ], "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" } ], "job": { "capability": "tax.calculate", "name": "Tax calculate" }, "others": [ { "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/anrok-vs-taxjar.json", "title": "Anrok vs TaxJar", "url": "https://www.anchorterminal.com/compare/anrok-vs-taxjar" }, { "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/avalara-vs-taxjar.json", "title": "Avalara AvaTax vs TaxJar", "url": "https://www.anchorterminal.com/compare/avalara-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/fonoa-vs-numeral.json", "title": "Fonoa vs Numeral", "url": "https://www.anchorterminal.com/compare/fonoa-vs-numeral" }, { "json": "https://www.anchorterminal.com/compare/fonoa-vs-taxjar.json", "title": "Fonoa vs TaxJar", "url": "https://www.anchorterminal.com/compare/fonoa-vs-taxjar" }, { "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-taxjar.json", "title": "Kintsugi vs TaxJar", "url": "https://www.anchorterminal.com/compare/kintsugi-vs-taxjar" }, { "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-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" }, { "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/taxcloud-vs-taxjar.json", "title": "TaxCloud vs TaxJar", "url": "https://www.anchorterminal.com/compare/taxcloud-vs-taxjar" }, { "json": "https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax.json", "title": "TaxJar vs Vertex O Series", "url": "https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax" }, { "json": "https://www.anchorterminal.com/compare/taxjar-vs-zamp.json", "title": "TaxJar vs Zamp", "url": "https://www.anchorterminal.com/compare/taxjar-vs-zamp" } ], "scores": [ { "by": 59, "edge": "taxjar", "key": "reliability", "name": "Reliability", "numeral": 25, "taxjar": 84, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 39, "edge": "numeral", "key": "schema", "name": "Schema \u0026 documentation", "numeral": 87, "taxjar": 48, "weight": 13 }, { "by": 10, "edge": "numeral", "key": "ergonomics", "name": "Agent ergonomics", "numeral": 71, "taxjar": 61, "weight": 13 }, { "by": 4, "edge": "numeral", "key": "security", "name": "Security \u0026 auth", "numeral": 47, "taxjar": 43, "weight": 14 }, { "by": 20, "edge": "taxjar", "key": "payments", "name": "Payments \u0026 pricing", "numeral": 10, "taxjar": 30, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 4, "edge": "taxjar", "key": "maintenance", "name": "Maintenance \u0026 community", "numeral": 60, "taxjar": 64, "weight": 7 }, { "by": 26, "edge": "taxjar", "key": "transparency", "name": "Transparency \u0026 trust", "numeral": 45, "taxjar": 71, "weight": 7 } ], "summary": "TaxJar scores 57.6 (C) on agent readiness against Numeral's 49.3 (D), and leads in 4 of 7 scored categories. Numeral leads on schema \u0026 documentation and agent ergonomics. Both do tax calculate.", "verdicts": { "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.", "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." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/numeral-vs-taxjar", "json": "https://www.anchorterminal.com/compare/numeral-vs-taxjar.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/numeral-vs-taxjar.md", "slim": "https://www.anchorterminal.com/compare/numeral-vs-taxjar.min.md" }, "markdown": "TaxJar scores 57.6 (C) on agent readiness against Numeral's 49.3 (D), and leads in 4 of 7 scored categories. Numeral leads on schema \u0026 documentation and agent ergonomics. Both do tax calculate.\n\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- TaxJar: grade C, 57.6/100, rank #470 of 722. Markdown https://www.anchorterminal.com/tools/taxjar.md · JSON https://www.anchorterminal.com/api/v1/tools/taxjar.json\n\n## Which one, for what\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\nAhead on:\n- Schema \u0026 documentation, 87 against 48\n- Agent ergonomics, 71 against 61\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### 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 25\n- Payments \u0026 pricing, 30 against 10\n- Transparency \u0026 trust, 71 against 45\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\n## Score by category\n\n| Category | Weight | Numeral | TaxJar | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 25 | 84 | TaxJar +59 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 87 | 48 | Numeral +39 |\n| Agent ergonomics | 13% (16.2 this run) | 71 | 61 | Numeral +10 |\n| Security \u0026 auth | 14% (17.5 this run) | 47 | 43 | Numeral +4 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 10 | 30 | TaxJar +20 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 60 | 64 | TaxJar +4 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 45 | 71 | TaxJar +26 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **49.3 · D** | **57.6 · C** | |\n\n## Facts side by side\n\n| Fact | Numeral | TaxJar |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Numeral Two, Inc. | TaxJar (Stripe) |\n| Hosted endpoint | `https://api.numeralhq.com` | `https://api.taxjar.com/v2` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Paid | Paid |\n| x402 | no | no |\n| Licence | Proprietary service under Numeral's terms of service. The Go, Python and Node SDKs are Apache-2.0 | Proprietary service under TaxJar's terms of service and API licence agreement. The official API clients on GitHub are MIT |\n| Tools exposed | 14 | none |\n| Read-only variant documented | yes | no |\n| llms.txt | yes | no |\n| Last release | 2026-09-15 | 2026-09-02 |\n| Terms last updated | no date given | 2026-05-14 |\n| Privacy policy last updated | no document linked | 2022-01-07 |\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 | not found in the text | 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 | 0 stars, 9 npm/wk, 19 PyPI/wk | 57 stars, 95k npm/wk, 50k PyPI/wk |\n\n## Verdicts\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**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## Before you call either\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### 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## Questions\n\n### Which is better for AI agents, Numeral or TaxJar?\n\nTaxJar scores 57.6 (C) on agent readiness against Numeral's 49.3 (D), and leads in 4 of 7 scored categories. Numeral leads on schema \u0026 documentation and agent ergonomics.\n\n### Do Numeral and TaxJar need an API key?\n\nBoth need an API key.\n\n### Can an agent call Numeral and TaxJar without installing anything?\n\nYes. Numeral has a hosted endpoint at https://api.numeralhq.com and TaxJar at https://api.taxjar.com/v2.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/numeral-vs-taxjar.json, and with the fewest tokens: https://www.anchorterminal.com/compare/numeral-vs-taxjar.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"numeral\", \"b\": \"taxjar\"}`. From a terminal: `anchor compare numeral taxjar`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/numeral.json and https://www.anchorterminal.com/api/v1/tools/taxjar.json\n\n## Other comparisons with Numeral or TaxJar\n\n- [Anrok vs Numeral](https://www.anchorterminal.com/compare/anrok-vs-numeral.md)\n- [Anrok vs TaxJar](https://www.anchorterminal.com/compare/anrok-vs-taxjar.md)\n- [Avalara AvaTax vs Numeral](https://www.anchorterminal.com/compare/avalara-vs-numeral.md)\n- [Avalara AvaTax vs TaxJar](https://www.anchorterminal.com/compare/avalara-vs-taxjar.md)\n- [Fonoa vs Numeral](https://www.anchorterminal.com/compare/fonoa-vs-numeral.md)\n- [Fonoa vs TaxJar](https://www.anchorterminal.com/compare/fonoa-vs-taxjar.md)\n- [Kintsugi vs Numeral](https://www.anchorterminal.com/compare/kintsugi-vs-numeral.md)\n- [Kintsugi vs TaxJar](https://www.anchorterminal.com/compare/kintsugi-vs-taxjar.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 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- [Quaderno vs TaxJar](https://www.anchorterminal.com/compare/quaderno-vs-taxjar.md)\n- [TaxCloud vs TaxJar](https://www.anchorterminal.com/compare/taxcloud-vs-taxjar.md)\n- [TaxJar vs Vertex O Series](https://www.anchorterminal.com/compare/taxjar-vs-vertex-tax.md)\n- [TaxJar vs Zamp](https://www.anchorterminal.com/compare/taxjar-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": "Numeral vs TaxJar", "url": "" } ], "description": "TaxJar scores 57.6 (C) on agent readiness against Numeral's 49.3 (D), and leads in 4 of 7 scored categories. Numeral leads on schema \u0026 documentation and agent ergonomics. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Numeral D 49.3", "TaxJar C 57.6", "scores" ], "h1": "Numeral vs TaxJar", "image": "https://www.anchorterminal.com/assets/og/compare-numeral-vs-taxjar.png", "path": "/compare/numeral-vs-taxjar", "published": "2026-10-01", "section": "tools", "title": "Numeral vs TaxJar for AI agents, D 49.3 vs C 57.6 | Anchor Terminal", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/numeral-vs-taxjar" }, "tokens": { "markdown": 2200, "slim": 680 }, "version": 1 }