How to Build a Clay Client Asset Delivery Portal with Fast.io

While the vast majority of marketing agencies continue to rely on manual email attachments and raw spreadsheets for client deliverables, industry benchmarks show that implementing a dedicated client portal reduces manual delivery emails by up to 80% [Orases Customer Portal Statistics 2026]. This execution gap is where this guide lives.

Lead generation teams invest hours configuring sophisticated lead enrichment sequences in Clay. They connect multiple database lookups, query LinkedIn profiles, scrape website text, search for verified emails, and check mobile phone numbers. This intensive data gathering produces detailed tables containing dozens of columns of valuable business intelligence. However, when the time comes to deliver these lead lists to clients, the operational pipeline breaks down. Most agencies resort to exporting raw CSV files, manually renaming columns, and attaching spreadsheets to emails or sending link shares to personal Google Drive folders.

This manual handoff method introduces serious security vulnerabilities and version confusion. Clay tables can have thousands of rows and get very large, sometimes tens of megabytes, making them too large for email attachments, which typically fail around 25 MB. Furthermore, raw CSV formatting can look unpolished, containing timestamp columns, UUIDs, and system codes that confuse non-technical clients. Clients receive files with inconsistent column layouts, leading to repeated questions for account managers about the meaning of specific fields. If a lead list requires updates or email verification corrections, sending a new version via email causes confusion over which file is current. A Clay client asset delivery portal resolves these issues by establishing a single, branded external gateway where agency clients can access lead enrichment files. By replacing manual attachments with a structured web portal, agencies can automate lead list delivery, verify client access, and maintain clean version controls.

To automate the lead handoff, you must connect your data enrichment system to a dedicated delivery workspace. When evaluating storage solutions, agencies typically begin with standard file storage services.

Local storage options keep files trapped on individual computers, preventing team collaboration and creating data loss risks. Cloud object storage services, such as Amazon S3 or Google Cloud Storage, offer secure and programmable environments but lack a client-facing user interface. Building a custom frontend on top of object storage requires significant engineering effort, including writing custom authentication logic and designing data tables.

Commodity file sharing platforms like Google Drive, Dropbox, or OneDrive are simple to set up but fall short for professional agency delivery. They lack full white-label capabilities, forcing clients to view vendor branding. They also require clients to register for accounts and navigate cluttered folders. Standard consumer tools like Google Drive or Dropbox do not have APIs optimized for programmatic agent writes without complex OAuth flows and token refresh management.

Fastio provides a better path by combining shared Fastio workspaces with white-labeled Content Portals. In a Fastio workspace, sales agents and automated tools share the same file context. When lead lists are generated in Clay, they are automatically written to a dedicated workspace folder. Because this folder is backed by a live Content Portal, the deliverables sync to the client portal instantly. Fastio's scoped API keys make it easy for automated scripts and developer workflows to read and write files securely without managing complex user-session tokens. This architecture ensures version history is preserved, allowing you to track downloads while maintaining control over asset distribution.

Connecting Clay to your Fast.io workspace requires setting up a webhook handler to receive data runs and write them as files. This workflow relies on Clay's HTTP API enrichment to POST enriched rows to your receiver URL.

Since Clay does not natively host client portals, this guide outlines a recommended integration pattern using Fastio's REST API. The setup involves four steps:

1. Create a dedicated client folder inside your Fast.io workspace (for example, /Deliverables/Client-A).
2. Generate an API key in Fast.io under Settings > Devices & Agents > API Keys.
3. Configure a serverless function (such as a Node.js script hosted on Vercel or AWS Lambda) to act as an intermediary sync engine.
4. Set up an HTTP POST action in Clay that triggers when a lead enrichment run is complete, sending the row data as a JSON payload to your serverless function.

The serverless function receives the JSON payload, parses the lead rows, converts the data into a formatted CSV file, and uploads the file with POST https://api.fast.io/current/upload/. It stringifies the JSON array into a valid CSV format, buffer-writes it, and pushes the file directly to Fast.io. Send the bytes as multipart form fields (name, size, chunk, action=create, instance_id for the workspace, and folder_id=root). Authenticate with Authorization: Bearer {api_key}. A successful create returns HTTP 201 with id (the upload session) and new_file_id (the storage node). Uploading the same file name into the same folder overwrites in place and keeps the previous content as a recoverable version, so the node_id stays stable.

The following code is a programmatic Node.js example showing how to upload a generated lead list to a Fast.io workspace folder:

import { readFile } from 'fs/promises';

async function uploadLeadList(filePath, workspaceId, apiKey) {
  const bytes = await readFile(filePath);
  const form = new FormData();
  form.append('name', 'q3_enriched_leads.csv');
  form.append('size', String(bytes.length));
  form.append('chunk', new Blob([bytes]), 'q3_enriched_leads.csv');
  form.append('action', 'create');
  form.append('instance_id', workspaceId);
  form.append('folder_id', 'root');

const response = await fetch('https://api.fast.io/current/upload/', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${apiKey}`,
    },
    body: form,
  });

return response.json();
}

When building this integration, handle API errors and rate limits gracefully. Fast.io returns HTTP 429 with error code 1671 when a caller is rate limited. Integrations should back off until the x-ve-limit-expires header.

Every organization on Fast.io runs on a paid subscription. You can evaluate the platform using a 14-day free trial, which requires a credit card during signup. Fast.io offers three main subscription tiers: Starter at $29 per month, Business at $99 per month, and Growth at $299 per month.

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Once the lead files are saved to your Fast.io workspace, present them in a branded external portal by creating a Send, Receive, or Exchange share with POST https://api.fast.io/current/workspace/{workspace_id}/create/share/. This white-labeled portal ensures a consistent client experience.

Agencies can customize the visual design of the client portal to match their brand identity. In the portal settings, you can upload your agency logo, select a custom color palette using HSL values, and configure a custom domain (such as leads.youragency.com) with automated SSL certificate provisioning. This custom presentation helps agencies present themselves as technology-driven partners rather than simple service providers.

To simplify access, Fast.io supports Guest Portal Access. This feature allows clients to view and download their lead files without needing to create an account or manage login credentials. You can generate secure access links that work directly in the client's browser. To protect sensitive data, you can set expiration dates on these links or enforce password protection.

To maintain internal security, Fast.io provides granular permissions at the organization, workspace, folder, and file levels. You can restrict client access to specific folders, ensuring they only see their own deliverables. Fast.io's append-only audit log records every action, including file views, searches, and downloads. This audit trail provides your agency with proof of delivery and allows you to track when clients download their lead lists.

Beyond simple file downloads, a Fast.io portal turns static spreadsheets into interactive databases. This capability relies on Metadata Views, which turn raw files into structured data grids.

With Metadata Views, you describe the fields you want extracted from your files using natural language. Fast.io's AI automatically designs a typed schema with columns mapping to specific types (such as Text, Integer, Decimal, Boolean, URL, JSON, Date & Time). It scans the lead lists in your workspace, matches the documents, and populates a spreadsheet grid. Clients can sort, filter, and search these columns directly in the portal, making it easy to find specific records.

For example, if your agency delivers a folder of unstructured PDF company profiles or text documents scraped via Clay, Metadata Views can automatically extract "Company Name", "Main Value Proposition", "Founded Year", and "Estimated Revenue" directly from the unstructured text of those documents. This allows you to turn folders of mixed file formats into clean, structured tables without manual data entry.

It is important to distinguish Metadata Views from Intelligence Mode. Intelligence Mode operates as the search and summarization layer, indexing files to enable conversational chat and semantic search. Metadata Views serve as the structured extraction layer, organizing raw file data into typed database columns. This combination allows clients to both search by metadata values and run semantic queries across their lead lists.

The client portal includes a built-in Q&A chatbot named Ripley. Ripley reads the indexed files in the portal and allows clients to run natural language queries over their lead data. A client can ask, "How many leads have valid email addresses?" or "Summarize the top technology companies in this list." Ripley processes the query and answers with page-level citations pointing directly to the source documents. This interactive layer transforms raw lead lists into a searchable database.