Xero to Postgres integration for a queryable accounting replica
The Xero to Postgres integration from Adapters syncs invoices, contacts, payments, and the chart of accounts from the Xero Accounting API into your own Postgres tables on an incremental schedule, so finance reporting and internal apps query ledger data with plain SQL instead of paging the Xero API. Field mapping is no-code, so try it against sample records in the live demo.
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Last updated September 2026
What running Xero to Postgres by hand costs you
- Xero reports cannot join to your product, CRM, or billing tables, so questions that span accounting and app data get answered by exporting to a spreadsheet.
- The Xero API caps you at 60 calls a minute and 5,000 a day per org, so a live lookup from your own application is slow and rate limited.
- Invoices and payments change after they post, and a one-time CSV export into Postgres is out of date before the next reconciliation.
The field mapping, out of the box
These cables are pre-wired when you pick the pair. Rewire any of them, or add your own, in the same visual data mapping tool you use for every adapter.
Input / XERO
Output / POSTGRES
Transforms included
Incremental loads use the Xero UpdatedDateUTC watermark plus the If-Modified-Since header so only changed records come back and you stay under the rate limit; amounts cast to Postgres NUMERIC(19,4), the nested Contact object flattens to a foreign-key column that joins the contacts table, the Microsoft-format date strings parse to TIMESTAMPTZ in UTC, and writes upsert with ON CONFLICT on the Xero object id so a retry never double-inserts.
Xero to Postgres in depth
One number governs this route and it is not the rate limit everyone quotes. Xero allows 5,000 API calls per day per connected organization, and that daily ceiling decides your entire integration design. Read from Xero developer documentation and the PostgreSQL manual, current as of 30 August 2026.
The 5,000 per day ceiling is the real constraint
Xero enforces four limits per connected tenant: 5 concurrent calls, 60 calls per minute, and 5,000 calls per day, with an app-wide ceiling of 10,000 calls per minute across all tenants. Teams design against the 60 per minute figure because it is the one that trips first in testing, then hit a wall in production. The daily allocation is the tightest of any accounting platform we document, and it does not refill until the window rolls. Watch X-DayLimit-Remaining, X-MinLimit-Remaining and X-AppMinLimit-Remaining on every response and you will see the wall coming.
Why per-transaction writes do not scale here
Work the arithmetic before you build. An integration that writes an invoice, a payment and a fee for each order spends three calls per order, so 5,000 calls per day supports roughly 1,600 orders before the organization is locked out for the rest of the day. That is a modest ecommerce volume. The correct design at any real scale is a summarized daily journal rather than a document per transaction, which collapses thousands of orders into a handful of calls and reads exactly the same in the ledger.
Money belongs in NUMERIC, never in the PostgreSQL MONEY type
Cast Xero totals, subtotals and tax to NUMERIC(19,4). The PostgreSQL MONEY type looks like the obvious choice and is a trap: its behavior depends on the database lc_monetary setting, so the same stored value formats and parses differently on another server. A replica restored into a differently configured instance reads back different numbers with no error anywhere. NUMERIC has none of that dependency and keeps the arithmetic exact.
Keep the currency code in its own column
Multi-currency organizations return amounts in both the invoice currency and the organization base currency, and a schema that stores only the number silently mixes them. Store the currency code alongside every amount and the base-currency equivalent as a separate column. Reconciliation against a bank feed then compares like with like, and a report that sums a single amount column across currencies becomes impossible to write by accident.
TIMESTAMPTZ, not TIMESTAMP, for every Xero date
Xero returns UTC timestamps, and storing them in a PostgreSQL TIMESTAMP column throws the offset away. The failure mode is seasonal: an incremental watermark drifts by an hour twice a year when daylight saving changes, which either re-reads a slice of records or skips one. TIMESTAMPTZ keeps the instant unambiguous. Xero also returns dates in a Microsoft format string on some endpoints, so parse rather than assume ISO 8601.
Incremental loads on UpdatedDateUTC plus If-Modified-Since
The way to live inside 5,000 calls a day is to stop asking for records that have not changed. Filter on the UpdatedDateUTC watermark and send the If-Modified-Since header, and each run returns only what moved. End the window at least a few hours in the past and re-read the overlap with an upsert, because a window that ends at the moment the run starts loses anything written during the run itself, every single time.
Upsert on the Xero GUID so retries repair rather than duplicate
Every Xero object carries a GUID. Make that the conflict target and write with ON CONFLICT ... DO UPDATE, so a retried run, an overlapping window or a replayed batch converges on the correct row instead of inserting a second one. Invoices and bills change status after they post, so the same record legitimately arrives many times over its life. An append-only load produces a table where the newest row is correct and every aggregate is wrong.
Where this sits in a wider stack
A Postgres replica of Xero is the right shape when the questions span accounting and application data, because that join cannot happen inside Xero. If the destination is a warehouse rather than an operational database, the loading rules differ enough to matter and are covered on our Postgres ETL tools page. If you are moving off a commercial database engine at the same time, the type mapping traps on that route are tabled on data migration tools.
How it goes live
Three steps, minutes end to end, covered by flat data integration pricing from $49 a month.
STEP 01
Pick the pair
Connect Xero and Postgres with scoped credentials. About a minute each.
STEP 02
Confirm the mapping
The cables above are pre-wired. Adjust any field, preview the transform on sample records, done.
STEP 03
Schedule the sync
Hourly down to every minute, with retries, alerting, and a full log on every run.
Prefer to understand the moving parts first? Our long-form guide to the Xero to Postgres guide covers the field-by-field detail, the failure cases, and what changes at volume.
Xero to Postgres sync: common questions
How do I sync Xero to Postgres?
Authorize the Xero organization, pick the endpoints you need, map them onto Postgres tables, and set a schedule. The load runs incrementally on the UpdatedDateUTC watermark and upserts on the Xero GUID with ON CONFLICT, so status changes on invoices and bills reach Postgres without a full reload each night.
What Postgres types should Xero amounts use?
NUMERIC(19,4) for totals, subtotals and tax, and TIMESTAMPTZ for the UTC timestamps Xero returns. Do not use the PostgreSQL MONEY type: it is locale dependent through lc_monetary. Keeping the currency code in its own column matters too, because multi-currency organizations return amounts in both the invoice and the base currency.
Why put Xero data in Postgres rather than a warehouse?
When an application reads it. A billing portal, an internal ops tool or a customer-facing dashboard that already queries Postgres should not have to reach into a warehouse for invoice status. If the consumer is analytical and the history is long, a columnar warehouse is the better destination and the sync looks otherwise identical.
How do I avoid duplicate Xero invoices in Postgres?
Upsert on the Xero GUID, not on the invoice number. Invoice numbers can be edited and can repeat across organizations, while the GUID is stable and unique. Add a unique index on the GUID column so the database enforces it, and the worst outcome of a re-run becomes a no-op rather than a duplicated ledger.
How does the Xero to Postgres sync work?
The Xero to Postgres integration from Adapters syncs invoices, contacts, payments, and the chart of accounts from the Xero Accounting API into your own Postgres tables on an incremental schedule, so finance reporting and internal apps query ledger data with plain SQL instead of paging the Xero API. Field mapping is no-code, so try it against sample records in the live demo.
Is there a prebuilt Xero connector for Postgres?
Yes. This Xero to Postgres connector ships prebuilt: the field mapping is wired the moment you pick the pair, transforms are included, and you can try it against sample records in the live demo. No code or engineering sprint required.
How much does the Xero Postgres integration cost?
Pricing is flat and monthly: Starter at $49, Growth at $149, Scale at $399. Every plan includes this pair, visual field mapping, and per-record logs. There are no per-task or per-row fees, so the bill stays the same as volume grows.
How often can Adapters sync Xero to Postgres?
Hourly on Starter, every 5 minutes on Growth, and down to every minute on Scale. Failed records retry automatically with backoff, and alerting plus a full per-record log come standard on every run.
Do I need to write code to connect Xero and Postgres?
No. Fields are auto-mapped the moment you pick the pair, and you can rewire any mapping visually before the first sync. Incremental loads use the Xero UpdatedDateUTC watermark plus the If-Modified-Since header so only changed records come back and you stay under the rate limit; amounts cast to Postgres NUMERIC(19,4), the nested Contact object flattens to a foreign-key column that joins the contacts table, the Microsoft-format date strings parse to TIMESTAMPTZ in UTC, and writes upsert with ON CONFLICT on the Xero object id so a retry never double-inserts.
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Xero and Postgres, finally in agreement
Map the pair once and let it sync on schedule. Flat price from $49 a month, no per-task fees.
No credit card required.