Mobile

Use Foldr with Claude iOS (MCP)

Claude iOS is Anthropic's official mobile app for Claude. In 2026 it gained support for "Remote MCP" - HTTP-based MCP servers that don't require a local process, which is the only model that can work on mobile. Foldr's hosted MCP endpoint works in Claude iOS without any companion Mac setup.

AnthropiciOS, iPadOSMCP: beta

Installation

Add the Foldr MCP server to Claude iOS with the snippet below. Replace fs_… with an API key from foldr.space/developers/signup. Each upload costs 5¢ - top up account credits or subscribe to Pro tier to bypass per-call charges.

Claude iOS → Settings → Connectors → + Add
Name:       Foldr
Server URL: https://foldr.space/api/mcp
Auth:       API Key  →  fs_live_...

Setup tip: Requires Claude Pro or Team subscription. iPad uses the same flow.

Official Claude iOS MCP docs

What You Can Do

Upload any file from Claude iOS to Foldr and get a permanent shareable URL back in the same turn (5¢ per upload, debited from credits)
Mint short-lived capability tokens to share files with downstream agents without leaking your API key
Organize uploads into per-API-key folders with hierarchical structure
Shorten long URLs to foldr.space/s/... links - free with any API key
Upload camera-roll files directly into Foldr from your phone

Claude iOS + Foldr FAQ

How do I install the Foldr MCP server in Claude iOS?

Open Claude iOS's MCP configuration (Settings → Connectors / Integrations) and paste the config block shown above. Set FOLDR_API_KEY to a key you create at foldr.space/developers/signup. Restart Claude iOS if it doesn't hot-reload.

How much does it cost to use Foldr from Claude iOS?

Each upload costs 5¢. You can pay by topping up account credits via the `top_up_credits` MCP tool (min $5) - every upload then debits from balance. Or subscribe to Pro tier ($25/mo) and per-call charges are bypassed entirely. Tools that don't write data (list_files, mint_capability, get_usage, etc.) are free.

I set the key but Claude iOS says the Foldr tool isn't available - what's wrong?

Three common causes: (1) Claude iOS wasn't restarted after editing the config - most MCP hosts need a restart to pick up new servers. (2) The API key is wrong or missing - verify the env var name your client reads (e.g. FOLDR_API_KEY) matches the config snippet above. (3) Your client doesn't support the streamable-http transport - most modern clients do, but check Claude iOS's docs for the version that added MCP support.

Can Claude iOS upload files directly to Foldr, or just generate URLs?

Claude iOS can do both. The MCP server exposes tools for `upload_file` (base64-encoded file content), `bulk_upload` (up to 20 files in one call), `mint_capability` (short-lived shareable links), and `create_short_url`. On mobile, uploads use the device camera roll / share sheet via the remote MCP endpoint.

Is the Foldr MCP integration with Claude iOS production-ready?

Foldr's MCP server is stable and used in production - streamable-http transport at https://foldr.space/api/mcp with 23 tools. Claude iOS's MCP support is currently in public beta - suitable for day-to-day use. Every write endpoint accepts an Idempotency-Key so retries are safe.

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Connect Claude iOS to Foldr in under a minute

Grab an API key, paste the snippet above into Claude iOS's MCP config, top up credits (or grab a Pro subscription), and your agent can upload files and mint share links immediately.

Get your Foldr API key x402 details