Summary
This is a straightforward utility server that handles base64 encoding and decoding, including URL-safe variants. It runs as a remote service over SSE transport and uses the x402 micropayment system, so you'll pay per operation. The GitHub repo is pretty bare, just showing the TypeScript source structure without much documentation. Reach for this if you need Claude to encode or decode base64 strings on the fly and you're already set up with x402 payments. It's a simple codec service, nothing more. The remote API endpoint suggests it's hosted and ready to use rather than something you run locally.
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one prompt install →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.):
{
"mcpServers": {
"base64-codec": {
"url": "https://base64-codec.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
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:
{"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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