openapi: 3.1.0 info: title: Bulk QR Code Generator description: Send a list of texts — website addresses, phone numbers, plain words, WiFi details, anything — and get back a ready-to-use QR code image for each one. Every QR code comes as a base64-encoded PNG you can drop straight into a webpage or save to disk. Great for marketing campaigns, event tickets, product labels, menus, or any situation where you need many QR codes in one go. Empty entries are quietly skipped. Each input is limited to 700 characters. You must send at least one non-empty entry. version: 1.0.0 contact: name: _done url: https://forms.gle/5KzuSFH7p8hHtDmz7 email: info@underscoredone.com x-openapi-url: https://qr-code-generator.underscoredone.com/openapi.json x-logo: url: https://underscoredone.com/logo.png altText: _done x-guidance: 'POST a JSON body with a key ''texts'' containing an array of strings. Each string becomes one QR code. The response is an array of objects in the same order as the non-empty inputs, each containing ''text'' (the original string) and ''qr_base64'' (a data URI string starting with ''data:image/png;base64,'' ready for use in an HTML img src or file save). Strings longer than 700 characters or that are empty after stripping whitespace are rejected with a 400 error identifying the offending index. The output is fully deterministic: the same input text always produces the same base64 PNG. Use the ''size'' parameter (integer, pixels, default 600, range 100–1200) to control image width. Use ''error_correction'' parameter (L, M, Q, H — default H) to control scan reliability.' x-ai-instructions: 'POST a JSON body with a key ''texts'' containing an array of strings. Each string becomes one QR code. The response is an array of objects in the same order as the non-empty inputs, each containing ''text'' (the original string) and ''qr_base64'' (a data URI string starting with ''data:image/png;base64,'' ready for use in an HTML img src or file save). Strings longer than 700 characters or that are empty after stripping whitespace are rejected with a 400 error identifying the offending index. The output is fully deterministic: the same input text always produces the same base64 PNG. Use the ''size'' parameter (integer, pixels, default 600, range 100–1200) to control image width. Use ''error_correction'' parameter (L, M, Q, H — default H) to control scan reliability.' x-provider: _done — single-purpose utility APIs for developers and AI agents. Pay per call with USDC on Base Mainnet or Solana Mainnet. x-pricing: model: pay-per-call currency: USDC network: Base Mainnet or Solana Mainnet price: $0.01 x-keywords: [] x-category: qr code x-provider-url: https://underscoredone.com x-agentcash-auth: mode: paid x-402: price: $0.01 network: eip155:8453 asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913' pay_to: '0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08' facilitator: https://api.cdp.coinbase.com/platform/v2/x402 scheme: exact description: Send a list of texts — website addresses, phone numbers, plain words, WiFi details, anything — and get back a ready-to-use QR code image for each one. Every QR code comes as a base64-encoded PNG you can drop straight into a webpage or save to disk. Great for marketing campaigns, event tickets, product labels, menus, or any situation where you need many QR codes in one go. Empty entries are quietly skipped. Each input is limited to 700 characters. You must send at least one non-empty entry. mime_type: application/json networks: - network: eip155:8453 asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913' pay_to: '0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08' - network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp asset: EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v pay_to: 8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b paths: /generate: post: tags: - qr code - qr code generator - qr - generate qr - text to qr code - qr code image - url to qr - wifi qr code - bulk qr codes - qr png - create qr code - qr code api - vcard qr - make qr code summary: Convert a list of texts into QR code PNG images in one request description: Turn a list of texts into QR code PNG images. Empty entries are skipped. At least one real entry must be in the list. operationId: generate_generate_post requestBody: content: application/json: schema: $ref: '#/components/schemas/QRRequest' required: true responses: '200': description: Successful response content: application/json: schema: $ref: '#/components/schemas/QRResponse' examples: success: summary: Successful response value: api_version: 1.0.0 count: 2 results: - text: https://example.com qr_base64: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAlgAAAJYCAYAAAC+ZpjcAA... - text: 'Phone: +1-800-555-0199' qr_base64: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAlgAAAJYCAYAAAC+ZpjcAA... '422': description: Unprocessable — a required field is missing or the wrong type. Check the detail field for specifics. content: application/json: schema: type: object properties: detail: type: array '402': description: Payment required. Send a signed USDC payment on Base Mainnet or Solana Mainnet using the x402 protocol. headers: X-Payment-Response: description: x402 payment challenge — base64-encoded JSON with payment details. schema: type: string '400': description: Bad request — your input failed validation or could not be processed. Check the detail field for specifics. content: application/json: schema: type: object properties: detail: type: string x-ai-instructions: 'POST a JSON body with a key ''texts'' containing an array of strings. Each string becomes one QR code. The response is an array of objects in the same order as the non-empty inputs, each containing ''text'' (the original string) and ''qr_base64'' (a data URI string starting with ''data:image/png;base64,'' ready for use in an HTML img src or file save). Strings longer than 700 characters or that are empty after stripping whitespace are rejected with a 400 error identifying the offending index. The output is fully deterministic: the same input text always produces the same base64 PNG. Use the ''size'' parameter (integer, pixels, default 600, range 100–1200) to control image width. Use ''error_correction'' parameter (L, M, Q, H — default H) to control scan reliability.' x-guidance: 'POST a JSON body with a key ''texts'' containing an array of strings. Each string becomes one QR code. The response is an array of objects in the same order as the non-empty inputs, each containing ''text'' (the original string) and ''qr_base64'' (a data URI string starting with ''data:image/png;base64,'' ready for use in an HTML img src or file save). Strings longer than 700 characters or that are empty after stripping whitespace are rejected with a 400 error identifying the offending index. The output is fully deterministic: the same input text always produces the same base64 PNG. Use the ''size'' parameter (integer, pixels, default 600, range 100–1200) to control image width. Use ''error_correction'' parameter (L, M, Q, H — default H) to control scan reliability.' x-payment-info: price: fixed: mode: fixed currency: USD amount: '0.01' protocols: - x402: {} components: schemas: HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError QRRequest: properties: texts: items: type: string type: array title: Texts description: The list of things you want turned into QR codes — website addresses, phone numbers, plain text, WiFi credentials, anything you like. Each entry must be 700 characters or fewer. Empty entries are skipped. At least one real entry is required. size: anyOf: - type: integer - type: 'null' title: Size description: How wide (and tall — QR codes are square) the output image should be, measured in pixels. Must be between 100 and 1200. Defaults to 600 if you leave it out. default: 600 error_correction: anyOf: - type: string - type: 'null' title: Error Correction description: How much damage or dirt the QR code can survive and still scan correctly. Choose L (least tough, smallest code), M, Q, or H (most tough, slightly larger code). Defaults to H, which is best for printed labels or stickers. default: H type: object required: - texts title: QRRequest example: error_correction: H size: 600 texts: - https://example.com - https://example.com/product/42 QRResponse: properties: api_version: type: string title: Api Version description: API version default: 1.0.0 count: type: integer title: Count description: How many QR codes were generated — matches the number of non-empty entries you sent. results: items: $ref: '#/components/schemas/QRResult' type: array title: Results description: One entry for each non-empty text you sent, in the same order, each containing the original text and its QR code image. type: object required: - count - results title: QRResponse example: api_version: 1.0.0 count: 1 results: - qr_base64: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA... text: https://example.com QRResult: properties: text: type: string title: Text description: The original text that was turned into this QR code. qr_base64: type: string title: Qr Base64 description: The QR code image as a data URI string starting with 'data:image/png;base64,' — paste it straight into an HTML img src or decode it to save as a PNG file. type: object required: - text - qr_base64 title: QRResult ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type input: title: Input ctx: type: object title: Context type: object required: - loc - msg - type title: ValidationError securitySchemes: siwx: type: apiKey in: header name: SIGN-IN-WITH-X description: CAIP-122 wallet signature for repeat access after payment servers: - url: https://qr-code-generator.underscoredone.com description: Production tags: - name: qr code - name: qr code generator - name: qr - name: generate qr - name: text to qr code - name: qr code image - name: url to qr - name: wifi qr code - name: bulk qr codes - name: qr png - name: create qr code - name: qr code api - name: vcard qr - name: make qr code x402Version: 2 x-payment-accepts: - scheme: exact network: eip155:8453 payTo: '0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08' asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913' - scheme: exact network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp payTo: 8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b asset: EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v