fca-api 2.0.0

Python client library for the UK Financial Services (FCA) Register RESTful API

fca-api

An async Python client for the UK Financial Conduct Authority's Financial Services Register RESTful API.

Covers firms, individuals, funds, permissions, disciplinary history, and regulated markets, with Pydantic-typed responses and cursor-based pagination.

Requirements

• Python 3.11+
• httpx, pydantic

Installation

pip install fca-api

Quick Start

import asyncio
import fca_api

async def main():
    async with fca_api.async_api.Client(
        credentials=("[e-mail]", "your_api_key")
    ) as client:
        page = await client.search_frn("Barclays")
        for firm in page.data:
            print(f"{firm.name} (FRN: {firm.frn}) — {firm.status}")

        if page.data:
            details = await client.get_firm(page.data[0].frn)
            print(details.name, details.status, details.effective_date)

if __name__ == "__main__":
    asyncio.run(main())

Two clients

• fca_api.async_api.Client — Pydantic-typed responses, cursor pagination, the default choice.
• fca_api.raw_api.RawClient — thin wrapper around the HTTP endpoints; raw JSON in, raw JSON out.

Usage Examples

Pagination

async with fca_api.async_api.Client(credentials=("email", "key")) as client:
    page = await client.search_frn("revolution")
    while True:
        for firm in page.data:
            print(f"{firm.name} — {firm.status}")
        if not page.pagination.has_next:
            break
        page = await client.fetch_next_page(page.pagination.next_page)

    # Or collect at least N items in one call:
    page = await client.search_frn("revolution", result_count=100)

The next_page token is self-contained — it embeds the endpoint and arguments, so a separate process can resume with only the token in hand. See PageTokenSerializer if you want to sign or encrypt tokens crossing a trust boundary.

Firm information

firm = await client.get_firm("123456")
print(firm.name, firm.status)

addresses = await client.get_firm_addresses("123456")
for address in addresses.data:
    print(", ".join(address.address_lines))

Individual and fund searches

people = await client.search_irn("John Smith")
for person in people.data:
    print(f"{person.name} (IRN: {person.irn})")

funds = await client.search_prn("Vanguard")
for fund in funds.data:
    print(f"{fund.name} (PRN: {fund.prn})")

Error handling

import fca_api.exc

try:
    firm = await client.get_firm("invalid_frn")
except fca_api.exc.FcaRequestError as e:
    print(f"API request failed: {e}")

Rate limiting

Pass any async context manager factory as api_limiter; the client enters it around each request.

from asyncio_throttle import Throttler

async with fca_api.async_api.Client(
    credentials=("email", "key"),
    api_limiter=Throttler(rate_limit=10),
) as client:
    page = await client.search_frn("test")

Raw client

async with fca_api.raw_api.RawClient(credentials=("email", "key")) as client:
    response = await client.search_frn("Barclays")
    for item in response.data or []:
        print(item)
    print(response.result_info)

Documentation

Full reference at docs.release.art/fca-api. Every public class and method carries a docstring; use help() in the REPL or your IDE.

Authentication

Get credentials from the FCA Developer Portal (free registration). Keep them out of version control.

License

Mozilla Public License 2.0 — see LICENSE.