> ## Documentation Index > Fetch the complete documentation index at: https://aisa.one/docs/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > - Base URLs: models `https://api.aisa.one/v1` (Gemini GenerateContent: `https://api.aisa.one/v1beta`); data APIs `https://api.aisa.one/apis/v1`. The `servers` of each operation in https://aisa.one/openapi.yaml is authoritative. > - Auth: `Authorization: Bearer $AISA_API_KEY`. Never print, log, or commit the key. > - MCP (preferred for agents): `https://mcp.aisa.one/mcp`, signed in with OAuth, so there is no key to paste. > - Agent Skill: `npx skills add AIsa-team/agent-skills --skill aisa`. Fallback with the AIsa CLI: `aisa skills install aisa`. > - Spending: docs, https://aisa.one/models, https://aisa.one/api, `/v1/models`, and MCP `search`, `list_categories`, `get_details`, `batch_quote`, and the `account` operation are free. Quote the exact calls before running them (MCP `batch_quote`, CLI `aisa quote --json`). If the quote reports `auto_execute_eligible: true`, run it unless the user set a tighter limit or asked only for a quote. Otherwise, tell the user in one message the planned calls, the quoted price, and a total USD budget for the task, then wait for approval. Direct HTTP calls follow the stricter rule at https://aisa.one/docs/get-started/cli.md#direct-http-fallback. Do not make paid calls to test availability. Full rule: https://aisa.one/llms.txt # Check Domain Availability > Usage-based billing; Default request estimate: $0.00089 USD (not a fixed price). Declared unit rate: $0.000001 USD per provider_credit. Account-specific pricing and final settlement may differ. ## Request contract * **Method and path:** POST /apis/v1/api-ninjas/check-domain * **Availability:** enabled * **Request URL template:** `https://api.aisa.one/apis/v1/api-ninjas/check-domain` * **Runtime facts:** 80f6d0ab09ca1b2bfaa51bc30934eca7d1f0ea7e38c9d075b9100f098998c5d9 [Complete OpenAPI definition](https://aisa.one/docs/reference-contracts/api-ninjas.json) Effective request and pricing declaration (including authentication and referenced schemas): ```json theme={null} { "operationId": "api-ninjas.check-domain", "method": "POST", "path": "/apis/v1/api-ninjas/check-domain", "servers": [ { "url": "https://api.aisa.one" } ], "parameters": [], "security": [ { "bearerAuth": [] } ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "type": "object", "required": [ "domain" ], "properties": { "domain": { "type": "string", "examples": [ "example.com" ], "description": "Valid domain to check (e.g., example.com). For top-level domains other than .com, a premium subscription is required." } } } } } }, "x-aisa-status": "enabled", "x-aisa-pricing": { "cost_contract": "response_units", "customer_multiplier": 1.0, "customer_pricing": "provider_cost_multiplier", "default_request_estimate_usd": 0.00089, "estimate_source": "profile_seed", "evidence_source": "response_body", "maximum_units": 10000000, "unit": "provider_credit", "unit_rate_usd": 1e-06 }, "components": { "securitySchemes": { "bearerAuth": { "scheme": "bearer", "type": "http" } } } } ``` ## Cost and request rules Usage-based billing; Default request estimate: \$0.00089 USD (not a fixed price). Declared unit rate: \$0.000001 USD per provider\_credit. Account-specific pricing and final settlement may differ. Published reference values are not an account-specific quote or a settled charge. For endpoints supporting X-AISA-Cost-Mode: quote, obtain a free quote for your exact request before execution; reconcile the settled cost with response metadata and Usage Logs. USD amounts use 1,000,000 integer micro-USD per dollar. * **Default request reference estimate (USD):** 0.00089 * **Declared unit rate (USD):** 1e-06 * **Billing unit:** provider\_credit * **Cost contract:** response\_units * **Published reference multiplier:** 1.0 * **Declared maximum count/units:** 10000000 * **Settlement evidence source:** response\_body ## OpenAPI ````yaml reference-contracts/api-ninjas.json POST /apis/v1/api-ninjas/check-domain openapi: 3.1.0 info: description: '' title: API Ninjas version: '1' x-aisa-capabilities: idempotency: Idempotency-Key max_price: X-AISA-Max-Price-USD quote: header: X-AISA-Cost-Mode value: quote x-aisa-configured-paths: - /apis/v1/api-ninjas/analyze-sentiment - /apis/v1/api-ninjas/barcode-generate - /apis/v1/api-ninjas/bitcoin - /apis/v1/api-ninjas/calculate-calories-burned - /apis/v1/api-ninjas/calculate-mortgage - /apis/v1/api-ninjas/calculate-sales-tax - /apis/v1/api-ninjas/check-domain - /apis/v1/api-ninjas/check-is-public-holiday - /apis/v1/api-ninjas/check-is-working-day - /apis/v1/api-ninjas/check-spelling - /apis/v1/api-ninjas/commodity-price - /apis/v1/api-ninjas/compute-text-similarity - /apis/v1/api-ninjas/convert-currency - /apis/v1/api-ninjas/convert-unit - /apis/v1/api-ninjas/crypto-price - /apis/v1/api-ninjas/detect-text-language - /apis/v1/api-ninjas/disposable-email-checker - /apis/v1/api-ninjas/dns-lookup - /apis/v1/api-ninjas/earnings-calendar - /apis/v1/api-ninjas/earnings-call-transcript - /apis/v1/api-ninjas/etf-info - /apis/v1/api-ninjas/extract-webpage-content - /apis/v1/api-ninjas/filter-profanity - /apis/v1/api-ninjas/find-ev-charging-stations - /apis/v1/api-ninjas/generate-lorem-ipsum - /apis/v1/api-ninjas/generate-password - /apis/v1/api-ninjas/generate-qr-code - /apis/v1/api-ninjas/generate-random-user - /apis/v1/api-ninjas/generate-sudoku - /apis/v1/api-ninjas/generate-text-embeddings - /apis/v1/api-ninjas/generate-user-agent - /apis/v1/api-ninjas/get-advice - /apis/v1/api-ninjas/get-air-quality - /apis/v1/api-ninjas/get-aircraft - /apis/v1/api-ninjas/get-airports - /apis/v1/api-ninjas/get-animals - /apis/v1/api-ninjas/get-baby-names - /apis/v1/api-ninjas/get-bucketlist - /apis/v1/api-ninjas/get-cats - /apis/v1/api-ninjas/get-celebrity - /apis/v1/api-ninjas/get-chuck-norris-joke - /apis/v1/api-ninjas/get-city - /apis/v1/api-ninjas/get-cocktail - /apis/v1/api-ninjas/get-company-logo - /apis/v1/api-ninjas/get-country-flag - /apis/v1/api-ninjas/get-country-info - /apis/v1/api-ninjas/get-county - /apis/v1/api-ninjas/get-dad-joke - /apis/v1/api-ninjas/get-day-in-history - /apis/v1/api-ninjas/get-dictionary-definition - /apis/v1/api-ninjas/get-dogs - /apis/v1/api-ninjas/get-earnings - /apis/v1/api-ninjas/get-electric-vehicle-info - /apis/v1/api-ninjas/get-emoji - /apis/v1/api-ninjas/get-exchange-rate - /apis/v1/api-ninjas/get-exercises - /apis/v1/api-ninjas/get-fact-of-the-day - /apis/v1/api-ninjas/get-facts - /apis/v1/api-ninjas/get-gdp - /apis/v1/api-ninjas/get-geocoding - /apis/v1/api-ninjas/get-helicopter - /apis/v1/api-ninjas/get-historical-events - /apis/v1/api-ninjas/get-historical-figures - /apis/v1/api-ninjas/get-hobbies - /apis/v1/api-ninjas/get-horoscope - /apis/v1/api-ninjas/get-hospitals - /apis/v1/api-ninjas/get-income-tax - /apis/v1/api-ninjas/get-insider-transactions - /apis/v1/api-ninjas/get-ip-lookup - /apis/v1/api-ninjas/get-joke-of-the-day - /apis/v1/api-ninjas/get-jokes - /apis/v1/api-ninjas/get-motorcycles - /apis/v1/api-ninjas/get-mutual-fund - /apis/v1/api-ninjas/get-mx-records - /apis/v1/api-ninjas/get-planets - /apis/v1/api-ninjas/get-population - /apis/v1/api-ninjas/get-postal-code - /apis/v1/api-ninjas/get-property-tax - /apis/v1/api-ninjas/get-public-holidays - /apis/v1/api-ninjas/get-quote-of-the-day - /apis/v1/api-ninjas/get-random-image - /apis/v1/api-ninjas/get-random-quotes - /apis/v1/api-ninjas/get-random-word - /apis/v1/api-ninjas/get-reverse-geocoding - /apis/v1/api-ninjas/get-rhymes - /apis/v1/api-ninjas/get-riddles - /apis/v1/api-ninjas/get-sales-tax - /apis/v1/api-ninjas/get-sec-filing - /apis/v1/api-ninjas/get-stars - /apis/v1/api-ninjas/get-stock-exchange - /apis/v1/api-ninjas/get-stock-price - /apis/v1/api-ninjas/get-swift-code - /apis/v1/api-ninjas/get-thesaurus - /apis/v1/api-ninjas/get-ticker - /apis/v1/api-ninjas/get-timezone - /apis/v1/api-ninjas/get-trivia - /apis/v1/api-ninjas/get-trivia-of-the-day - /apis/v1/api-ninjas/get-unemployment - /apis/v1/api-ninjas/get-university - /apis/v1/api-ninjas/get-url-lookup - /apis/v1/api-ninjas/get-weather - /apis/v1/api-ninjas/get-weather-forecast - /apis/v1/api-ninjas/get-whois - /apis/v1/api-ninjas/get-working-days - /apis/v1/api-ninjas/get-worldtime - /apis/v1/api-ninjas/get-zipcode - /apis/v1/api-ninjas/iban-lookup - /apis/v1/api-ninjas/income-tax-calculator - /apis/v1/api-ninjas/inflation - /apis/v1/api-ninjas/list-stock-tickers - /apis/v1/api-ninjas/lookup-vin - /apis/v1/api-ninjas/market-cap - /apis/v1/api-ninjas/nutrition - /apis/v1/api-ninjas/scrape-website - /apis/v1/api-ninjas/solve-sudoku - /apis/v1/api-ninjas/validate-email - /apis/v1/api-ninjas/validate-eu-vat - /apis/v1/api-ninjas/validate-phone - /apis/v1/api-ninjas/validate-routing-number x-aisa-document: facts_hash: 80f6d0ab09ca1b2bfaa51bc30934eca7d1f0ea7e38c9d075b9100f098998c5d9 generator_version: '3' protocol_version: '1' schema_version: '1' composer_version: '28' response_pending: - operation_id: api-ninjas.barcode-generate path: /apis/v1/api-ninjas/barcode-generate method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.bitcoin path: /apis/v1/api-ninjas/bitcoin method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.commodity-price path: /apis/v1/api-ninjas/commodity-price method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.crypto-price path: /apis/v1/api-ninjas/crypto-price method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.disposable-email-checker path: /apis/v1/api-ninjas/disposable-email-checker method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.dns-lookup path: /apis/v1/api-ninjas/dns-lookup method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.earnings-calendar path: /apis/v1/api-ninjas/earnings-calendar method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.earnings-call-transcript path: /apis/v1/api-ninjas/earnings-call-transcript method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.etf-info path: /apis/v1/api-ninjas/etf-info method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.get-ip-lookup path: /apis/v1/api-ninjas/get-ip-lookup method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.get-ticker path: /apis/v1/api-ninjas/get-ticker method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.get-url-lookup path: /apis/v1/api-ninjas/get-url-lookup method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.iban-lookup path: /apis/v1/api-ninjas/iban-lookup method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.income-tax-calculator path: /apis/v1/api-ninjas/income-tax-calculator method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.inflation path: /apis/v1/api-ninjas/inflation method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.market-cap path: /apis/v1/api-ninjas/market-cap method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.nutrition path: /apis/v1/api-ninjas/nutrition method: POST statuses: - '200' reason: public success response has no authoritative payload declaration - operation_id: api-ninjas.validate-eu-vat path: /apis/v1/api-ninjas/validate-eu-vat method: POST statuses: - '200' reason: public success response has no authoritative payload declaration document_hash: sha256:893ed06a4a54f48629d1c4303925c2c611d07a9ccb107a2d07b0dff0ae10794f x-aisa-plans: builder: 1 display_plan: payg payg: 1 similarweb_payg: 1 team: 1 version: e70a0959cd1b93b84ae16dffd7a538273ddb9c1d46277b82823c37ff1b6bc0fb x-aisa-provider: api-ninjas x-aisa-catalogs: api-ninjas: title: API Ninjas description: '' x-aisa-document: facts_hash: 80f6d0ab09ca1b2bfaa51bc30934eca7d1f0ea7e38c9d075b9100f098998c5d9 generator_version: '3' protocol_version: '1' schema_version: '1' x-aisa-plans: builder: 1 display_plan: payg payg: 1 similarweb_payg: 1 team: 1 version: e70a0959cd1b93b84ae16dffd7a538273ddb9c1d46277b82823c37ff1b6bc0fb x-aisa-capabilities: idempotency: Idempotency-Key max_price: X-AISA-Max-Price-USD quote: header: X-AISA-Cost-Mode value: quote servers: - url: https://api.aisa.one security: - bearerAuth: [] paths: /apis/v1/api-ninjas/check-domain: post: tags: - API Ninjas summary: Check Domain Availability description: >- Usage-based billing; Default request estimate: $0.00089 USD (not a fixed price). Declared unit rate: $0.000001 USD per provider_credit. Account-specific pricing and final settlement may differ. operationId: api-ninjas.check-domain requestBody: required: true content: application/json: schema: type: object required: - domain properties: domain: type: string examples: - example.com description: >- Valid domain to check (e.g., example.com). For top-level domains other than .com, a premium subscription is required. responses: '200': description: Tool result data content: application/json: schema: $ref: >- #/components/schemas/Response576A0Ea506F3_connect_API_NINJAS_CHECK_DOMAIN__output__public_data default: content: application/json: schema: {} description: >- Error response; upstream passthrough responses may use provider formats x-codeSamples: - lang: text label: Reference example source: >- # Fixed reference example. Playground inputs do not update this sample. curl --request POST \ --url https://api.aisa.one/apis/v1/api-ninjas/check-domain \ --header 'Authorization: Bearer ' \ --header 'Content-Type: application/json' \ --data '{ "domain": "example.com" }' components: schemas: Response576A0Ea506F3_connect_API_NINJAS_CHECK_DOMAIN__output__public_data: $ref: >- #/components/schemas/Response576A0Ea506F3_connect_API_NINJAS_CHECK_DOMAIN__output__2a3f03902ca0a546 Response576A0Ea506F3_connect_API_NINJAS_CHECK_DOMAIN__output__2a3f03902ca0a546: type: object required: - domain - available properties: domain: type: string available: type: boolean registrar: type: string created_date: type: integer securitySchemes: bearerAuth: scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.