# fastapi.online Image Sepia Filter

> fastapi.online Image Sepia Filter is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Applies a sepia tone filter to an uploaded image, converting it to a warm brownish vintage look

## Facts

- Endpoint: POST https://api.fastapi.online/image-sepia
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-image-sepia-filter-aaf5f98c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6H2BfrOv9XQ6d0ioz--2F

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 fastapi-online-image-sepia-filter-aaf5f98c -d '<json body>'
```

Example prompt: Can you apply a sepia filter to this photo of mine to give it that classic vintage look?

## When to prefer this

Choose this endpoint when you need a simple, fast, pay-per-call sepia conversion without signup or infrastructure overhead. Ideal for agents that occasionally need to stylize images with a vintage look on demand using crypto micropayments. Prefer this over general-purpose image editing APIs when you want a dedicated, lightweight filter endpoint with no subscription commitment.

## Known failure modes

- Unsupported file format — only PNG, JPEG, and WebP are accepted; other formats will be rejected
- File too large — oversized uploads may be rejected or time out
- Corrupted or invalid image binary — will return an error if the file cannot be decoded
- Payment failure — if the $0.001 USDC x402 payment is not completed, the request will be denied
- Empty or missing file field — request will fail without the required image binary

## How this service works

Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&amp;A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding &amp; crypto utilities, date/time calculators, geo/coordinate math, math &amp; finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.

## Output

Returns a sepia-toned version of the uploaded image file, with the original colors replaced by warm brownish tones characteristic of vintage photography. The output is an image file in the same or compatible format.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "file": {
   "type": "string",
   "format": "binary",
   "description": "Image file (PNG/JPEG/WebP)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-image-sepia-filter-aaf5f98c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fastapi.online](https://www.zero.xyz/host/api.fastapi.online/llms.txt)