--- title: "Billy API: connect it to your AI chat ยท Hypamoon" description: "The Billy API is open and signs in with an API key. What your AI chat can build with it on Hypamoon, how it connects, and the sources we checked." url: https://hypamoon.com/connect-to/billy --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Billy ERP and accounting # Connect Billy to Hypamoon Yes. Billy has a public, versioned API and you create the key yourself, so your chat can write the adapter. Open ## The check Three questions about the API of Billy, answered from its own docs. **Public API docs**\ **Yes.** [Read the docs](https://www.billy.dk/api/) **A key you create yourself**\ **Yes.** Create an access token under Settings, Access tokens; each token belongs to one company and does not expire. [billy.dk](https://www.billy.dk/api/) **Versions or a changelog**\ **Yes.** The version is in the base URL (v2), and Billy offers an email list for API changes. [billy.dk](https://www.billy.dk/api/) **How it signs in**\ An access token from Settings, Access tokens, sent in the X-Access-Token header; one token per company. **Webhooks**\ **Not confirmed.** **Hosting**\ Cloud ## In practice What it takes in a real Billy administration. **Getting access**\ Log in to Billy, go to Settings, Access tokens, create a token and copy it. **Limits**\ None published. **Writing**\ **Read and write.** Resources can be listed, read, created, updated and deleted where the resource allows it, for example invoices, contacts and bills. **Cost**\ Not published. ## Your own invoice and bookkeeping tools on Billy, shaped around your daily work. - Contacts, invoices, bills, products and bank lines, straight from Billy. - AI that proposes accounts for new bills and spots customers who pay later than usual, with you approving every booking. - A screen for your team and a short weekly email for you. ### Ask your chat Answers straight from your Billy data, in Claude or another chat with the full Hypamoon connection. - Which invoices are still unpaid after their due date? - How much did we spend with each supplier this quarter? ### On a schedule Billy has no webhooks we could confirm, so an agent checks every 15 minutes and decides what happens next. 1. Every 15 minutes New bills in Billy that are not booked yet. AI decides AI looks at earlier bills from the same supplier and proposes the account and VAT code. Then The proposal is saved on the bill in Billy after you approve it. AI proposes, you approve ### A screen for your team or customers An app on your own address, with sign-in, on top of the same Billy data. - For your team Your team sees open invoices per customer and what came in this week. ### Add Hypamoon Text messages, email, phone, payments and agents run in the same project as the adapter. - Agent on a schedule Once a week, an agent emails you the customers who pay later than they used to. Billy stays the core: your chat builds the rest on its API, as an adapter plus an app and agents in your Hypamoon project. Reading starts after you click Allow in the portal. Every change an agent or a chat makes in Billy waits for your approval, one call at a time. [How adapters work](https://hypamoon.com/docs/adapters) ### Good to know - Your adapter uses a fixed key: you paste it once in the Hypamoon portal, never in the chat, and it only goes to the API host you allow. - Tokens are tied to one company, so with several companies you create one token per company. HTTP Basic auth with email and password is also possible, but a token is the safer choice. ## Try it in your chat Fill in what to read and write, and send it. Say this in your chat > Build the Hypamoon recipe build-an-adapter for Billy. API docs: https://www.billy.dk/api/. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Billy.%20API%20docs%3A%20https%3A%2F%2Fwww.billy.dk%2Fapi%2F.%20Read%3A%20%5Bwhat%5D.%20Write%3A%20%5Bwhat%2C%20or%20nothing%5D.) In Claude, or another chat with the full Hypamoon connection; adapters are not in ChatGPT yet. You paste the key in the portal, never in the chat. [The full recipe](https://hypamoon.com/r/build-an-adapter) ## Sources Checked on 7 November 2026. - [www.billy.dk/api/](https://www.billy.dk/api/) Billy is a name of its owner, used here only to describe the software. This page is not an official integration and Hypamoon has no partnership with Billy. Found something that changed? Tell us at [support](https://hypamoon.com/support#contact). ## More in erp and accounting - [**Acumatica** Open](https://hypamoon.com/connect-to/acumatica) - [**AFAS Profit** Open](https://hypamoon.com/connect-to/afas-profit) - [**DATEV** Possible](https://hypamoon.com/connect-to/datev) - [**e-Boekhouden.nl** Open](https://hypamoon.com/connect-to/e-boekhouden) - [**Exact for Accountancy** Open](https://hypamoon.com/connect-to/exact-for-accountancy) - [**Exact Globe+** Possible](https://hypamoon.com/connect-to/exact-globe) - [**Exact Gripp** Possible](https://hypamoon.com/connect-to/exact-gripp) - [**Exact Multivers** Possible](https://hypamoon.com/connect-to/unit4-multivers) - [**Exact Online** Open](https://hypamoon.com/connect-to/exact-online) - [**FreshBooks** Open](https://hypamoon.com/connect-to/freshbooks) - [**Holded** Open](https://hypamoon.com/connect-to/holded) - [**Isah** Unknown](https://hypamoon.com/connect-to/isah) - [**Jortt** Open](https://hypamoon.com/connect-to/jortt) - [**KING Finance** Possible](https://hypamoon.com/connect-to/king-finance) - [**Lexware Office (lexoffice)** Open](https://hypamoon.com/connect-to/lexoffice) - [**Microsoft Dynamics 365 Business Central** Open](https://hypamoon.com/connect-to/dynamics-365-business-central) - [**Microsoft Dynamics 365 Finance and Operations** Open](https://hypamoon.com/connect-to/dynamics-365-finance-operations) - [**Microsoft Dynamics NAV** Open](https://hypamoon.com/connect-to/dynamics-nav) - [**Moneybird** Open](https://hypamoon.com/connect-to/moneybird) - [**Odoo** Open](https://hypamoon.com/connect-to/odoo) - [**Oracle NetSuite** Open](https://hypamoon.com/connect-to/oracle-netsuite) - [**Pennylane** Open](https://hypamoon.com/connect-to/pennylane) - [**QuickBooks Online** Open](https://hypamoon.com/connect-to/quickbooks-online) - [**Ridder iQ** Possible](https://hypamoon.com/connect-to/ridder-iq) - [**Sage Accounting (Sage Business Cloud)** Open](https://hypamoon.com/connect-to/sage-accounting) - [**Sage Intacct** Possible](https://hypamoon.com/connect-to/sage-intacct) - 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[**Brex** Open](https://hypamoon.com/connect-to/brex) - [**Expensify** Possible](https://hypamoon.com/connect-to/expensify) - [**Pleo** Possible](https://hypamoon.com/connect-to/pleo) - [**Ramp** Open](https://hypamoon.com/connect-to/ramp) - [**Rompslomp** Open](https://hypamoon.com/connect-to/rompslomp) - [**Informer** Open](https://hypamoon.com/connect-to/informer) - [**MKG** Possible](https://hypamoon.com/connect-to/mkg) - [**Octopus** Possible](https://hypamoon.com/connect-to/octopus) - [**Robaws** Open](https://hypamoon.com/connect-to/robaws) - [**Axonaut** Open](https://hypamoon.com/connect-to/axonaut) - [**Qonto** Open](https://hypamoon.com/connect-to/qonto) - [**weclapp** Open](https://hypamoon.com/connect-to/weclapp) - [**Xentral** Open](https://hypamoon.com/connect-to/xentral) - [**JTL-Wawi** Possible](https://hypamoon.com/connect-to/jtl-wawi) - [**PlentyONE** Open](https://hypamoon.com/connect-to/plentyone) - [**Candis** Possible](https://hypamoon.com/connect-to/candis) - [**FreeAgent** Open](https://hypamoon.com/connect-to/freeagent) - [**Dext** Closed](https://hypamoon.com/connect-to/dext) - [**Brightpearl** Possible](https://hypamoon.com/connect-to/brightpearl) - [**Katana** Open](https://hypamoon.com/connect-to/katana) - [**Fortnox** Possible](https://hypamoon.com/connect-to/fortnox) - [**Tripletex** Open](https://hypamoon.com/connect-to/tripletex) - [**e-conomic** Possible](https://hypamoon.com/connect-to/e-conomic) - [**Fatture in Cloud** Open](https://hypamoon.com/connect-to/fatture-in-cloud) - [**Fakturoid** Open](https://hypamoon.com/connect-to/fakturoid) - [**Moloni** Open](https://hypamoon.com/connect-to/moloni) - [**inFakt** Open](https://hypamoon.com/connect-to/infakt) - [**Zenvoices** Open](https://hypamoon.com/connect-to/zenvoices) - [**Minox** Possible](https://hypamoon.com/connect-to/minox) - [**Basecone** Possible](https://hypamoon.com/connect-to/basecone) - [**Silverfin** Possible](https://hypamoon.com/connect-to/silverfin) - [**Reeleezee** Unknown](https://hypamoon.com/connect-to/reeleezee) - [**bexio** Open](https://hypamoon.com/connect-to/bexio) - [**Run my Accounts** Open](https://hypamoon.com/connect-to/run-my-accounts) - [**Abacus** Possible](https://hypamoon.com/connect-to/abacus) - [**Collmex** Unknown](https://hypamoon.com/connect-to/collmex) - [**Papierkram** Possible](https://hypamoon.com/connect-to/papierkram) - [**BuchhaltungsButler** Open](https://hypamoon.com/connect-to/buchhaltungsbutler) - [**Visma AccountView** Possible](https://hypamoon.com/connect-to/visma-accountview) - [**Evoliz** Open](https://hypamoon.com/connect-to/evoliz) - [**Bokio** Open](https://hypamoon.com/connect-to/bokio) - [**Fiken** Possible](https://hypamoon.com/connect-to/fiken) - [**Cegid Loop** Possible](https://hypamoon.com/connect-to/cegid-loop) - [**Procountor** Possible](https://hypamoon.com/connect-to/procountor) - [**Reviso** Possible](https://hypamoon.com/connect-to/reviso) - [**Dinero** Possible](https://hypamoon.com/connect-to/dinero) - [**MyUnisoft** Possible](https://hypamoon.com/connect-to/myunisoft) - [**TOConline** Open](https://hypamoon.com/connect-to/toconline) - [**PowerOffice Go** Possible](https://hypamoon.com/connect-to/poweroffice-go) - [**Uniconta** Possible](https://hypamoon.com/connect-to/uniconta) - [**Quipu** Open](https://hypamoon.com/connect-to/quipu) - [**wFirma** Possible](https://hypamoon.com/connect-to/wfirma) - [**iFirma** Unknown](https://hypamoon.com/connect-to/ifirma) - [**Merit Aktiva** Open](https://hypamoon.com/connect-to/merit-aktiva) - [**Oracle Fusion Cloud ERP** Open](https://hypamoon.com/connect-to/oracle-fusion-cloud-erp) - [**ABRA Flexi** Possible](https://hypamoon.com/connect-to/abra-flexi) - [**POHODA** Possible](https://hypamoon.com/connect-to/pohoda) - [**Clear Books** Open](https://hypamoon.com/connect-to/clear-books) - [**Minimax** Possible](https://hypamoon.com/connect-to/minimax) - [**Microsoft Dynamics GP** Possible](https://hypamoon.com/connect-to/dynamics-gp) - [**SmartAccounts** Unknown](https://hypamoon.com/connect-to/smartaccounts) - [**AccountsIQ** Possible](https://hypamoon.com/connect-to/accountsiq) - [**KashFlow** Unknown](https://hypamoon.com/connect-to/kashflow) - [**Money S3** Possible](https://hypamoon.com/connect-to/money-s3) - [**Money S5** Unknown](https://hypamoon.com/connect-to/money-s5) - [**InsERT Subiekt** Possible](https://hypamoon.com/connect-to/insert-subiekt) - [**Comarch ERP Optima** Unknown](https://hypamoon.com/connect-to/comarch-erp-optima) - [**Symfonia** Unknown](https://hypamoon.com/connect-to/symfonia) - [**Pandle** Possible](https://hypamoon.com/connect-to/pandle) - [**Modern Treasury** Open](https://hypamoon.com/connect-to/modern-treasury) - [**Trovata** Possible](https://hypamoon.com/connect-to/trovata) - [**Kyriba** Unknown](https://hypamoon.com/connect-to/kyriba) - [**Agicap** Open](https://hypamoon.com/connect-to/agicap) - [**Embat** Unknown](https://hypamoon.com/connect-to/embat) - [**Spendesk** Open](https://hypamoon.com/connect-to/spendesk) - [**Soldo** Open](https://hypamoon.com/connect-to/soldo) - [**Zoho Expense** Open](https://hypamoon.com/connect-to/zoho-expense) - [**SAP Concur** Possible](https://hypamoon.com/connect-to/sap-concur) - [**Navan** Open](https://hypamoon.com/connect-to/navan) - [**Payhawk** Open](https://hypamoon.com/connect-to/payhawk) - [**Moss** Open](https://hypamoon.com/connect-to/moss) - [**Mooncard** Possible](https://hypamoon.com/connect-to/mooncard) - [**Tipalti** Possible](https://hypamoon.com/connect-to/tipalti) - [**Rydoo** Possible](https://hypamoon.com/connect-to/rydoo) - [**Emburse** Open](https://hypamoon.com/connect-to/emburse) - [**Coupa** Open](https://hypamoon.com/connect-to/coupa) - [**Libeo** Closed](https://hypamoon.com/connect-to/libeo) - [**N2F** Possible](https://hypamoon.com/connect-to/n2f) - [**Expensya** Open](https://hypamoon.com/connect-to/expensya) - [**Fyle** Open](https://hypamoon.com/connect-to/fyle) - [**Karbon** Open](https://hypamoon.com/connect-to/karbon) - [**Conscribo** Unknown](https://hypamoon.com/connect-to/conscribo) - [**Tellow** Closed](https://hypamoon.com/connect-to/tellow) - [**Asperion** Possible](https://hypamoon.com/connect-to/asperion) - [**Gekko** Closed](https://hypamoon.com/connect-to/gekko) - [**WinBooks on Web** Unknown](https://hypamoon.com/connect-to/winbooks) - [**Horus** Possible](https://hypamoon.com/connect-to/horus) - [**Clearfacts** Unknown](https://hypamoon.com/connect-to/clearfacts) - [**Sage BOB 50** Closed](https://hypamoon.com/connect-to/sage-bob-50) - [**orgaMAX** Possible](https://hypamoon.com/connect-to/orgamax) - [**abas ERP** Possible](https://hypamoon.com/connect-to/abas-erp) - [**proALPHA** Unknown](https://hypamoon.com/connect-to/proalpha) - [**Haufe X360** Possible](https://hypamoon.com/connect-to/haufe-x360) - [**Sage 100 (Germany)** Unknown](https://hypamoon.com/connect-to/sage-100-de) - [**EBP** Possible](https://hypamoon.com/connect-to/ebp) - [**Cegid XRP Flex** Unknown](https://hypamoon.com/connect-to/cegid-xrp-flex) - [**Sage 100 (France)** Closed](https://hypamoon.com/connect-to/sage-100-fr) - [**Sage Active** Open](https://hypamoon.com/connect-to/sage-active) - [**Sage 200** Possible](https://hypamoon.com/connect-to/sage-200) - [**Sage X3** Open](https://hypamoon.com/connect-to/sage-x3) - [**Sage 50 (UK)** Closed](https://hypamoon.com/connect-to/sage-50-uk) - [**TeamSystem Enterprise** Possible](https://hypamoon.com/connect-to/teamsystem-enterprise) - [**Zucchetti (Mago)** Unknown](https://hypamoon.com/connect-to/zucchetti-mago) - [**a3innuva** Possible](https://hypamoon.com/connect-to/a3innuva) - [**Cegid Primavera (ROSE and Jasmin)** Unknown](https://hypamoon.com/connect-to/cegid-primavera) - [**PHC GO** Possible](https://hypamoon.com/connect-to/phc-go) - [**QuickBooks Desktop** Open](https://hypamoon.com/connect-to/quickbooks-desktop) - [**Epicor Kinetic** Possible](https://hypamoon.com/connect-to/epicor-kinetic) - [**Infor CloudSuite (ION API)** Open](https://hypamoon.com/connect-to/infor-ion-api) [All 1094 tools](https://hypamoon.com/connect-to) ## Tool not listed? Ask the chat to check its API. The same three checks work for any software. Your chat reads the vendor's own docs and tells you what it found. Say this in your chat > Check if \[software\] has an open API that a Hypamoon adapter can use: public API docs, a key or token I can create myself without asking the vendor, and versions or a changelog. Link the pages you used. [Open in Claude](https://claude.ai/new?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) [Open in ChatGPT](https://chatgpt.com/?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) Fill in the name of your software. Checking needs no connection to Hypamoon. ## Ready to connect Billy? Connect your chat once, then ask it to build the adapter. [Start free](https://app.hypamoon.com/?mode=signup&utm_source=connect-to&utm_campaign=billy) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~billy#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~billy#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)