Is the Base64 Codec API MCP server free to use?

Yes. Base64 Codec API is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

Is the Base64 Codec API MCP server free to use?

Yes. Base64 Codec API is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

Base64 Codec API

Encode/decode base64 and URL-safe base64. x402 micropayment.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Install Config Generator

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claude_desktop_config.json

{
  "mcpServers": {
    "base64-codec-api": {
      "command": "npx",
      "args": [
        "-y",
        "base64-codec-api"
      ]
    }
  }
}

💡 Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

Documentation Overview

Base64 Codec API

Encode text to base64 or decode base64 to text. Supports standard and URL-safe variants with metadata. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

config.json

{
  "mcpServers": {
    "base64-codec": {
      "url": "https://base64-codec.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

Terminal

curl -X POST "https://base64-codec.api.klymax402.com/api/encode" \
  -H "Content-Type: application/json" \
  -d '{"data":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
`utility_encode_base64`	POST	`/api/encode`	$0.003	Encode or decode base64 data

`utility_encode_base64`

Use this when you need to encode text to base64 or decode base64 back to plaintext. Returns the result string with encoding metadata.

Parameters

Name	Type	Required	Description
`data`	string	yes	The data to encode or decode
`action`	string	no	Action: 'encode' or 'decode' (default: encode)

Example response:

config.json

{"result":"SGVsbG8gV29ybGQ=","action":"encode","inputLength":11,"outputLength":16,"urlSafe":false}

When to use: embedding binary data in JSON, preparing email attachments (MIME), or decoding base64 tokens from APIs. Use this BEFORE sending data through channels that only support ASCII.

Not for: hashing (use crypto_generate_hash), JWT decoding (use security_decode_jwt), URL slug creation (use text_generate_slug).

Example agent prompts

"Encode text to base64 or decode base64 back to plaintext"

Payment

Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
Network: Base L2 (eip155:8453)
Asset: USDC
Facilitator: Coinbase CDP (primary), PayAI (fallback)
Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

Catalog: https://klymax402.com/llms.txt
Full API reference: https://klymax402.com/llms-full.txt
Live stats: https://klymax402.com/stats

License

MIT

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Frequently Asked Questions about Base64 Codec API

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "base64-codec-api": { "command": "npx", "args": ["-y", "Base64 Codec API"] } }

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Technical Specs & Signals

CategoryFinance & Fintech

25Quality signal: Emerging · 25/100How this signal is calculated ▾

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Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

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Documentation Overview

Base64 Codec API

Encode text to base64 or decode base64 to text. Supports standard and URL-safe variants with metadata. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

config.json

{
  "mcpServers": {
    "base64-codec": {
      "url": "https://base64-codec.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

Terminal

curl -X POST "https://base64-codec.api.klymax402.com/api/encode" \
  -H "Content-Type: application/json" \
  -d '{"data":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
`utility_encode_base64`	POST	`/api/encode`	$0.003	Encode or decode base64 data

`utility_encode_base64`

Use this when you need to encode text to base64 or decode base64 back to plaintext. Returns the result string with encoding metadata.

Parameters

Name	Type	Required	Description
`data`	string	yes	The data to encode or decode
`action`	string	no	Action: 'encode' or 'decode' (default: encode)

Example response:

config.json

{"result":"SGVsbG8gV29ybGQ=","action":"encode","inputLength":11,"outputLength":16,"urlSafe":false}

When to use: embedding binary data in JSON, preparing email attachments (MIME), or decoding base64 tokens from APIs. Use this BEFORE sending data through channels that only support ASCII.

Not for: hashing (use crypto_generate_hash), JWT decoding (use security_decode_jwt), URL slug creation (use text_generate_slug).

Example agent prompts

"Encode text to base64 or decode base64 back to plaintext"

Payment

Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
Network: Base L2 (eip155:8453)
Asset: USDC
Facilitator: Coinbase CDP (primary), PayAI (fallback)
Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

Catalog: https://klymax402.com/llms.txt
Full API reference: https://klymax402.com/llms-full.txt
Live stats: https://klymax402.com/stats

License

MIT