Invoicing software from a small studio in the EU.

Space Invoices for platforms and Apollo for small businesses in 15 countries, plus four smaller products. Each has a hosted MCP server your agent can use.

Invoicing API for platforms

Invoicing and tax-compliance API that platforms build into their own product.

Add invoicing through an API, embedded screens or a white-label app.
Covers country rules such as e-invoicing, fiscalization and EU VAT checks.

Visit Space Invoices Pricing

Run in the EU by Studio 404 d.o.o. under licence from Space Invoices Inc.

invoice.ts@spaceinvoices/js-sdk

1import SpaceInvoices from "@spaceinvoices/js-sdk/sdk";
2const sdk = new SpaceInvoices({ accessToken });
3
4await sdk.invoices.create(
5  {
6    items: [{
7      name: "Satellite Deployment Mission",
8      quantity: 1,
9      price: 45000,
10      taxes: [{ rate: 22 }],
11    }],
12  },
13  { entity_id: "ent_lunar_base_alpha" },
14);

Invoicing in 15 countries

Apollo

Invoicing for freelancers and small businesses in 15 countries across Europe and the US.

Invoices, quotes and credit notes, with payment tracking and accounting exports.
Local rules where they apply: FURS in Slovenia, FINA in Croatia, FatturaPA in Italy.

Visit Apollo Pricing

Apollo's dashboard figures for a demo company, including $467.07 overdue — Product screens show demo data.

More from Studio 404

03–06

03HALAI support, live chat, CRM and email in one place, with flat monthly prices.Visit HAL
HAL MCPExample
AAna2 minOpen
How do I invite a teammate?
AI draftConfidence 92%
Go to Settings → Team and click Invite.
Invite teammatesApprove & send
```
list_conversations({ "project_slug": "acme", "status": "open", "limit": 20 })
→ { "visitor_name": "Ana", "last_message": "How do I invite a teammate?", "total": 1 }
```
https://api.chatwithhal.com/mcp
04DamperCustomer feedback to your coding agent: roadmap, project rules, changelog.Visit Damper
Damper MCPLive
#42SSO / SAML64 ptsIn progress
Claude Code · start_task → task locked
context: 3 docs · 12 rules
Checklist4/66/6
```
start_task({ "projectId": "cmvsa8dui002e01opnycemquo", "taskId": "cmvtdw0tw003v01nuokj9fj98" })
→ { "status": "in_progress", "message": "Task started. Good luck!" }
```
https://api.usedamper.com/mcp
05Domain Space.si domains for €19.99 a year, the same on renewal, plus DNS, email and websites.Visit Domain Space
Domain Space MCPExample
acme-labs.siSearch
acme-labs.siChecking…Available€19.99/year
Renewal stays at €19.99/year
```
check_domain({ "domain": "acme-labs.si" })
→ { "available": true, "priceCents": 1999, "currency": "EUR", "term": "1 year" }
```
https://domainspace.si/mcp
06SpacePostResend-compatible email API from an EU company, built on Amazon SES.Visit SpacePost
SpacePost MCPLive
Welcome to Acmeto ana@acme.example
email.delivered11:08:03
email.opened11:09:40
Open tracking on · webhooks signed
```
send_email({ "from": "onboarding@test.spacepost.dev", "to": ["delivered@test.spacepost.dev"], "subject": "Deploy finished", "text": "The deploy finished." })
→ { "id": "01a18759-1569-71d9-93ce-57e204f92169" }
```
https://api.spacepost.dev/mcp

HAL MCPExample

list_conversations({ "project_slug": "acme", "status": "open", "limit": 20 })
→ { "visitor_name": "Ana", "last_message": "How do I invite a teammate?", "total": 1 }

https://api.chatwithhal.com/mcp

Damper MCPLive

start_task({ "projectId": "cmvsa8dui002e01opnycemquo", "taskId": "cmvtdw0tw003v01nuokj9fj98" })
→ { "status": "in_progress", "message": "Task started. Good luck!" }

https://api.usedamper.com/mcp

Domain Space MCPExample

check_domain({ "domain": "acme-labs.si" })
→ { "available": true, "priceCents": 1999, "currency": "EUR", "term": "1 year" }

https://domainspace.si/mcp

SpacePost MCPLive

send_email({ "from": "onboarding@test.spacepost.dev", "to": ["delivered@test.spacepost.dev"], "subject": "Deploy finished", "text": "The deploy finished." })
→ { "id": "01a18759-1569-71d9-93ce-57e204f92169" }

https://api.spacepost.dev/mcp

Every product has a hosted MCP server, so agents can use it the way people do.

Every product has a hosted MCP server: give your agent an API key or sign in, and it can read and act in the product, with the access you give it. SpacePost also ships a local server on npm, publishes its OpenAPI spec, and with Domain Space publishes llms.txt.

Connectclaude mcp add --transport http spaceinvoices https://eu.spaceinvoices.com/mcp

You ask: What can you do with my invoices?

callssearch_operations

15 operations match “list invoices”Live

getInvoicesList all invoicesexecute_read
getAdvanceInvoicesList all advance invoicesexecute_read
getRecurringInvoicesList all recurring invoicesexecute_read

It finds what it may call first; no invoice data is read.

A live call to the Space Invoices MCP server. It searches the tool list, not your data.

Connectclaude mcp add --transport http apollo https://eu.spaceinvoices.com/mcp/r/wlr_156199db8087faa6901fdb63ed664604

Sign-in only (OAuth), no API keys: approve one business, read-only or read and write.

You ask: Show me which invoices from Quillbrook Labs Inc. are overdue, how much they owe, and whether we already sent a reminder.

callssearch_operationsexecute_read

2 overdue invoices for Quillbrook Labs Inc.Example

INV-2026-01814 days overdue€1,240.00
INV-2026-0217 days overdue€560.00

Total overdue is €1,800.00. A reminder was sent for the older invoice, but not for the newer one.

The example from getapollo.io, with Apollo's demo data.

Connectclaude mcp add --transport http hal https://api.chatwithhal.com/mcp --header "X-API-Key: YOUR_MCP_KEY"

Add a project MCP key with the permissions you choose.

You ask: Find today's unanswered chats and reply using our help articles.

callslist_conversationsfind_relevant_articlesreply_to_conversation

1 open chat answeredExample

AnaHow do I invite a teammate?open
Invite teammatesHelp article foundinvite-teammates
Reply sentGo to Settings → Team and click Invite.msg_01

Real HAL MCP tool shapes. The conversation and article are made up.

Connectclaude mcp add --transport http damper https://api.usedamper.com/mcp --header "Authorization: Bearer dmp_YOUR_KEY"

Add an API key bound to one project or to your whole account.

You ask: Start the top-voted task and load the rules for the files you'll change.

callsstart_task

Task started and locked to the agentLive

Statusin_progress
ChecklistCore proof, Versioning and release, Wire contract, Rendered output…
Rules loadedstandard/stack, standard/theming, standard/i18n-seo, workflow/delivery…

A live response from our own Platform project in Damper, trimmed for length.

Connectclaude mcp add --transport http domainspace https://domainspace.si/mcp --header "Authorization: Bearer dsp_YOUR_TOKEN"

Add a token with the scopes you choose, such as read, purchase or DNS.

You ask: Check whether acme-labs.si can be registered and prepare the order.

callscheck_domainstart_registration

acme-labs.si is availableExample

acme-labs.si1 year, VAT included€19.99
Checkout linkdomainspace.si/checkout?domain=acme-labs.si

You open the link and pay; the agent never can.

Real Domain Space MCP tool shapes with a made-up name. Registration is always checked live.

Connect

claude mcp add --transport http spacepost https://api.spacepost.dev/mcp --header "Authorization: Bearer sp_live_YOUR_KEY"

Add an API key, or run the server locally with npx. npx -y @spacepost/mcp

You ask: Send a test email saying the deploy finished.

callssend_email

Email accepted and deliveredLive

Deploy finishedto delivered@test.spacepost.dev
id01a18759-1569-71d9-93ce-57e204f92169

A live call to SpacePost's hosted MCP server, delivered to a test address.

Get in touch hello@studio404.net