URL to Base64

Fetch a file from a URL and return it as base64 with its content type and a data URI, ready to embed.

Pay by wallet (x402) base64-encode-url

Example

Example answer

{
  "url": "https://example.com",
  "base64": "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",
  "data_uri": "data:text/html;base64,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",
  "size_bytes": 559,
  "content_type": "text/html"
}

Inputs

Field	Type	Required	What it is
`url`	string	Yes	URL to fetch and encode

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`base64`	string	Always (present in every successful answer)
`data_uri`	string	Always (present in every successful answer)
`size_bytes`	integer	Always (present in every successful answer)
`content_type`	string	Always (present in every successful answer)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "base64-encode-url",
    "inputs": {
      "url": "https://strale.dev"
    },
    "max_price_cents": 2
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "base64-encode-url",
    "inputs": {
      "url": "https://strale.dev"
    },
    "max_price_cents": 2
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "base64-encode-url",
  inputs: {
    "url": "https://strale.dev"
  },
  max_price_cents: 2,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="base64-encode-url",
    inputs={
        "url": "https://strale.dev",
    },
    max_price_cents=2,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i 'https://api.strale.io/x402/v2/base64-encode-url?url=https%3A%2F%2Fstrale.dev'

Limitations

Fetched files are limited to 8 MiB
Files above 8 MiB are refused during download with a caller_input error naming the input field. The call is not charged.
What to do instead: For larger files, download locally and use a native base64 encoder instead of fetching through the API