How much does a svg-to-png call cost?

$0.003 per call, paid in USDC on Base via x402, with no account and no API key.

What does svg-to-png return?

A JSON object with 6 top-level fields: source_url, format, width, height, bytes and image_base64. The example on this page is a real call over images/svg-badge.svg.

What happens when a svg-to-png call fails?

The tool answers with a typed JSON error from the errors table. Payment is settled only after the tool has produced its result; a call that fails inside the tool is never settled. A 503 upstream_unavailable can follow a settled call; the x402 payments guide covers it, 429, 402 and an uncertain 500.

catalogue / tools / Images / SVG to PNG API

SVG to PNG API

Rasterises an SVG to a PNG at a chosen resolution, returned base64-encoded.

Endpoint: POST /v1/svg-to-png
Price: $0.003 per call
Family: Images
Docs: /docs/svg-to-png

01When to use it

Rasterising an SVG safely needs a real renderer and a hardened fetch: an SVG can point at internal addresses, so an agent that renders one itself walks past every SSRF control, and the output must be byte-reproducible.
Your source is SVG and you need PNG.

When not to use it

The input is over 25 MB (26,214,400 bytes): svg-to-png answers too_large (413).
The destination needs more than 60 s to answer: the call ends with upstream_timeout (424).
The destination is on a private or local network: the network guard refuses it with blocked_target (403).

02Parameters

Field	Type	Required	Description
url	string	yes	Absolute http(s) URL of the SVG, up to 2048 characters; redirects are followed and the body must look like SVG markup; external references in it are never fetched.
width	integer	no	Target width in pixels, 1 to 20000; when width or height is set the rendered raster is resized to fit inside that box, keeping its aspect ratio, and may be scaled up.
height	integer	no	Target height in pixels, 1 to 20000; when width or height is set the rendered raster is resized to fit inside that box, keeping its aspect ratio, and may be scaled up.
density	integer	no	Render resolution in DPI, 1 to 2400, default 96; the natural raster size scales with density / 72, so a 64-unit-wide SVG renders 85 pixels wide at 96. Default: 96.

03Limits

Limit	Value
Largest source file	25 MB (26,214,400 bytes)
Timeout	60 s
Source formats	SVG
Output formats	PNG

04Example

The published example of svg-to-png, verbatim: the request body and the response it returns.

Request

POST /v1/svg-to-png
content-type: application/json
payment-signature: <base64 x402 payload>

{
  "url": "https://grist.tools/samples/images/svg-badge.svg",
  "density": 192
}

Response

200 OK
payment-response: <base64 settlement receipt>

{
  "source_url": "https://grist.tools/samples/images/svg-badge.svg",
  "format": "png",
  "width": 171,
  "height": 128,
  "bytes": 2021,
  "image_base64": "iVBORw0KGgoAAAANSUhEUgAAAKsAAACACAYAAAB0g5nsAAAACXBIWXMAAB2HAAAd..."
}

Sample file: images/svg-badge.svg. 64x48 geometric SVG badge (rounded card, circle, square and a rule, no text), so its raster carries no font-dependent pixels.

In the sample itself, the root svg element sets width 64, height 48 and viewBox 0 0 64 48, and below it come 2 rect, 1 circle and 1 path elements. In the returned PNG: its IHDR chunk declares 171 by 128 pixels, 8-bit truecolour RGB with alpha and no interlacing. The next chunk is pHYs.

Response field	Type	In the example
source_url	string	"https://grist.tools/samples/images/svg-badge.svg"
format	string	"png"
width	number	171
height	number	128
bytes	number	2021
image_base64	string	a string of 67 characters

05Call it from code

JavaScript

// svg-to-png: $0.003 per call, paid in USD Coin on eip155:8453 via x402
// Install: npm install @x402/fetch@2 @x402/evm@2 viem@2
// Save as client.mjs (ES module, Node 18+), export EVM_PRIVATE_KEY with the paying wallet's key in your shell, then run: node client.mjs
// The wrapper reads the 402 (payment-required), signs and retries with payment-signature.
import { wrapFetchWithPayment, x402Client, decodePaymentResponseHeader } from '@x402/fetch'
import { ExactEvmScheme } from '@x402/evm/exact/client'
import { privateKeyToAccount } from 'viem/accounts'

const account = privateKeyToAccount(process.env.EVM_PRIVATE_KEY)
const client = new x402Client().register('eip155:8453', new ExactEvmScheme(account))
const fetchWithPayment = wrapFetchWithPayment(fetch, client)

const body = {
  "url": "https://grist.tools/samples/images/svg-badge.svg",
  "density": 192
}

const res = await fetchWithPayment('https://grist.tools/v1/svg-to-png', {
  method: 'POST',
  headers: { 'content-type': 'application/json' },
  body: JSON.stringify(body),
})
console.log(res.status, await res.json())
const settle = res.headers.get('payment-response')
if (settle) console.log(decodePaymentResponseHeader(settle).transaction)

Python

# svg-to-png: $0.003 per call, paid in USD Coin on eip155:8453 via x402
# Install: pip install "x402[requests,evm]>=2.24,<3"
# The session reads the 402 (payment-required), signs and retries with payment-signature.
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http import decode_payment_response_header
from x402.http.clients.requests import x402_requests
from x402.mechanisms.evm.exact import register_exact_evm_client
from x402.mechanisms.evm.signers import EthAccountSigner

account = Account.from_key(os.environ["EVM_PRIVATE_KEY"])
client = x402ClientSync()
register_exact_evm_client(client, EthAccountSigner(account), networks="eip155:8453")
session = x402_requests(client)

payload = {
    "url": "https://grist.tools/samples/images/svg-badge.svg",
    "density": 192
}

res = session.post("https://grist.tools/v1/svg-to-png", json=payload)
print(res.status_code, res.json())
settle = res.headers.get("payment-response")
if settle:
    print(decode_payment_response_header(settle).transaction)

curl

# svg-to-png: $0.003 per call, paid in USD Coin on eip155:8453 via x402
# 1. Unpaid call: HTTP 402, the requirements in the payment-required header (base64 JSON) and in the body.
curl -i -X POST 'https://grist.tools/v1/svg-to-png' -H 'content-type: application/json' -d '{"url":"https://grist.tools/samples/images/svg-badge.svg","density":192}'

# 2. Same call with the signed payment (an EIP-3009 authorization, EIP-712 signed: it cannot be
#    typed by hand). x-payment is accepted as the v1 alternative. HTTP 200 carries payment-response.
curl -i -X POST 'https://grist.tools/v1/svg-to-png' -H 'content-type: application/json' -H 'payment-signature: <base64 x402 payload>' -d '{"url":"https://grist.tools/samples/images/svg-badge.svg","density":192}'

06Errors

Code	HTTP	For this service
invalid_input	400	The body does not match the schema; its fields are url, width, height and density.
blocked_target	403
unreachable_target	424
upstream_timeout	424
unsupported_content_type	415	The source is not a type svg-to-png reads; it reads SVG.
too_large	413
unprocessable	422
internal	500

Input that is rejected before the tool runs (malformed JSON, schema mismatch, body over the size limit) is never charged.

When each code is raised, and what it means for payment: /docs/svg-to-png.

07Conversions

Conversion	Recorded sample	Source size	Output size
SVG to PNG	images/svg-badge.svg	365 bytes	2 KB

08Questions

How much does a svg-to-png call cost?: $0.003 per call, paid in USDC on Base via x402, with no account and no API key.
What does svg-to-png return?: A JSON object with 6 top-level fields: source_url, format, width, height, bytes and image_base64. The example on this page is a real call over images/svg-badge.svg.
What happens when a svg-to-png call fails?: The tool answers with a typed JSON error from the errors table. Payment is settled only after the tool has produced its result; a call that fails inside the tool is never settled. A 503 upstream_unavailable can follow a settled call; the x402 payments guide covers it, 429, 402 and an uncertain 500.