# URL to Base64 Encoder

> URL to Base64 Encoder is a paid API for AI agents from base64encode.use.x402atlas.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Fetches any public URL and returns its content as a base64-encoded string along with content type and a ready-to-use data URI.

## Facts

- Endpoint: GET https://base64encode.use.x402atlas.com/base64-encode-url?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/url-to-base64-encoder-22700505
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_thj1xwK2MDYTfC4Pjvh1i

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability url-to-base64-encoder-22700505
```

Example prompt: Can you fetch the image at https://example.com/photo.jpg and give me a ready-to-use base64 data URI so I can embed it directly in my API call?

## When to prefer this

Use this endpoint when you need to embed a remotely hosted file (image, PDF, or any binary) as a base64 data URI in an LLM prompt, API payload, or HTML — without downloading the file yourself. It is ideal for agents that need to pass file content inline to APIs that accept data URIs or base64 strings, especially when the file is already publicly accessible by URL. Prefer this over manual download-and-encode workflows when operating in serverless or constrained environments.

## Known failure modes

- Private, loopback, or link-local host URLs are rejected with an error
- Files larger than 4 MiB (4,194,304 bytes) are refused
- Non-public or inaccessible URLs return a fetch error
- Malformed or non-absolute URLs fail schema validation
- Upstream server errors (e.g. 404, 500) propagate as fetch failures

## How this service works

Fetch any public URL and return its content as base64 with the content type and a ready-to-use data URI. Embed images, PDFs and files directly in LLM and API calls without downloading them yourself. Clean JSON.

## Output

A JSON object containing the original URL, the final URL after redirects, the content type (e.g. image/png, application/pdf), the file size in bytes, the standard base64-encoded content (no line breaks), and a ready-to-use data URI in the format data:<content_type>;base64,<base64>.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "format": "uri",
       "maxLength": 2048,
       "description": "Public URL of the file to fetch and base64-encode (image, PDF, any file). Absolute http or https; private, loopback and link-local hosts are rejected. Content over 4 MiB is refused. Defaults to the example URL when omitted."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "url",
      "final_url",
      "content_type",
      "size_bytes",
      "base64",
      "data_uri"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "The URL as given by the caller."
      },
      "base64": {
       "type": "string",
       "description": "Standard base64 with padding of the fetched bytes, no line breaks."
      },
      "data_uri": {
       "type": "string",
       "description": "data:<content_type>;base64,<base64>, ready to embed."
      },
      "final_url": {
       "type": "string",
       "description": "URL after redirects (equals url when none)."
      },
      "size_bytes": {
       "type": "integer",
       "description": "Decoded byte length of the fetched content (at most 4194304)."
      },
      "content_type": {
       "type": "string",
       "description": "Media type without parameters; application/octet-stream when the upstream sent none."
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/url-to-base64-encoder-22700505/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from base64encode.use.x402atlas.com](https://www.zero.xyz/host/base64encode.use.x402atlas.com/llms.txt)