c. CallMint

THE LITTLE THINGS, HANDLED.

Small APIs.
Big shortcuts.

Clean up JSON. Check an invoice. Get your campaign URLs right. Focused tools for your next script, workflow or product.

Get 5,000 credits for $5 ↗Try a free demo ↓

USD $0.001 per credit. No subscription. No hidden monthly plan.

● ● ●POST /v1/json-repair

// a small fix, one API call

{
  "text": "{\"name\":\"CallMint\",}"
}

200 OK · 2 credits · $0.002

{
  "value": {
    "name": "CallMint"
  },
  "transformations": [
    "removed_trailing_commas"
  ]
}
JSON in. Useful JSON out.

TRY BEFORE YOU BUY

A tiny shortcut.
A real result.

Try the fixed JSON-repair example. No payment or API key required.

Input

{
  "text": "{\"name\":\"CallMint\",}"
}

Result

Run the example to see the result.

YOUR TOOLKIT

One key. Useful little APIs.

Start with Invoice Policy for repeatable business checks, then add snapshot comparisons or the original utilities. Four external-fetch tools remain disabled until safe egress is verified.

2 CREDITS

json-repair ↗

Clean JSON copied from a code block before passing it into a workflow.

USD $0.002 / successful call1 CREDITS

utm-validator ↗

Check campaign tagging while preserving existing query parameters. This API never opens the destination URL.

USD $0.001 / successful call20 CREDITS

invoice-validator ↗

Catch invoice total mismatches before importing billing data into another system.

USD $0.020 / successful call1 CREDITS

webhook-hmac ↗

Check a raw UTF-8 payload against a shared-secret hexadecimal signature.

USD $0.001 / successful call5 CREDITS

jsonld-validator ↗

Confirm that a JSON-LD payload is parseable and inspect whether top-level context and type are present.

USD $0.005 / successful callCOMING SOON

metadata ↗

Planned: extract page title, canonical URL, descriptions and social metadata for content tooling.

USD $0.005 / successful call when availableCOMING SOON

redirects ↗

Planned: inspect redirect hops when checking destination changes in published links.

USD $0.005 / successful call when available3 CREDITS

email-domain ↗

Inspect mail routing and the presence of a DMARC TXT declaration before configuring a domain.

USD $0.003 / successful callCOMING SOON

robots ↗

Planned: retrieve and inspect published robots.txt directives for a website.

USD $0.003 / successful call when availableCOMING SOON

sitemap ↗

Planned: inspect an XML sitemap’s type and location count without crawling the site.

USD $0.010 / successful call when available30 CREDITS

invoice-policy ↗

Apply your project’s immutable invoice rules and check vendor/invoice-number duplicates without storing raw invoices.

USD $0.030 / successful call20 CREDITS

crawler-policy ↗

Compare customer-supplied crawler permission maps with a saved baseline and required crawler list.

USD $0.020 / successful call50 CREDITS

seo-guard ↗

Compare customer-supplied deployment metadata with a baseline and versioned release requirements.

USD $0.050 / successful call

SIMPLE, PREPAID PRICING

A little credit goes a long way.

Every pack has the same rate: 1 credit = USD $0.001. Invalid inputs and upstream failures are not billed.

START BUILDING

Your next shortcut starts here.

We’ll email a secure verification link for purchases or key recovery. No password needed.

Access is not open yet. The operator must configure email delivery. Paid checkout also requires Stripe setup.

THREE SMALL STEPS

01

Verify & buy

Verify your email, choose a pack and pay on Stripe-hosted Checkout.

02

Get your key

After verified payment, use an email link to issue a key. Save it securely: it is shown once.

03

Make the call

Send your bearer key and a unique idempotency key. Successful calls spend credits once.

curl -X POST 'https://staging.callmint.dev/v1/utm-validator' \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Idempotency-Key: unique-request-001' \
  -H 'Content-Type: application/json' \
  -d '{"url":"https://example.com/?ref=launch","utm_source":"newsletter","utm_medium":"email","utm_campaign":"november"}'

GOOD QUESTIONS

A few things to know.

Do I need a subscription?

No. Buy prepaid credits through Stripe Checkout. All packs have the same USD price per credit.

What happens when a request fails?

Validation errors, upstream failures and timeouts do not spend credits. Use the same Idempotency-Key when retrying an uncertain request.

What if I lose my key?

Request a new verification email and explicitly rotate your key. The new key is shown once and old keys stop working.

Are all ten APIs available?

The ten original routes are preserved: five deterministic tools and one DNS lookup are implemented, while four external-fetch tools are disabled and unbilled. Three project-based policy and snapshot APIs are also available.

Is invoice validation tax advice?

No. It checks arithmetic only. JSON-LD and JSON repair also have deliberately limited, documented capabilities.