diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3a8816c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,162 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm-project.org/#use-with-ide
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
diff --git a/pdm.lock b/pdm.lock
new file mode 100644
index 0000000..dcacd3a
--- /dev/null
+++ b/pdm.lock
@@ -0,0 +1,96 @@
+# This file is @generated by PDM.
+# It is not intended for manual editing.
+
+[metadata]
+groups = ["default", "dev"]
+strategy = ["cross_platform", "inherit_metadata"]
+lock_version = "4.4.1"
+content_hash = "sha256:3246066da381b60f795abc7dd843f7057f2f1048414acd0c12916e4a0761544c"
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+requires_python = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+summary = "Cross-platform colored terminal text."
+groups = ["dev"]
+marker = "sys_platform == \"win32\""
+files = [
+    {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
+]
+
+[[package]]
+name = "exceptiongroup"
+version = "1.2.0"
+requires_python = ">=3.7"
+summary = "Backport of PEP 654 (exception groups)"
+groups = ["dev"]
+marker = "python_version < \"3.11\""
+files = [
+    {file = "exceptiongroup-1.2.0-py3-none-any.whl", hash = "sha256:4bfd3996ac73b41e9b9628b04e079f193850720ea5945fc96a08633c66912f14"},
+    {file = "exceptiongroup-1.2.0.tar.gz", hash = "sha256:91f5c769735f051a4290d52edd0858999b57e5876e9f85937691bd4c9fa3ed68"},
+]
+
+[[package]]
+name = "iniconfig"
+version = "2.0.0"
+requires_python = ">=3.7"
+summary = "brain-dead simple config-ini parsing"
+groups = ["dev"]
+files = [
+    {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
+    {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
+]
+
+[[package]]
+name = "packaging"
+version = "24.0"
+requires_python = ">=3.7"
+summary = "Core utilities for Python packages"
+groups = ["dev"]
+files = [
+    {file = "packaging-24.0-py3-none-any.whl", hash = "sha256:2ddfb553fdf02fb784c234c7ba6ccc288296ceabec964ad2eae3777778130bc5"},
+    {file = "packaging-24.0.tar.gz", hash = "sha256:eb82c5e3e56209074766e6885bb04b8c38a0c015d0a30036ebe7ece34c9989e9"},
+]
+
+[[package]]
+name = "pluggy"
+version = "1.4.0"
+requires_python = ">=3.8"
+summary = "plugin and hook calling mechanisms for python"
+groups = ["dev"]
+files = [
+    {file = "pluggy-1.4.0-py3-none-any.whl", hash = "sha256:7db9f7b503d67d1c5b95f59773ebb58a8c1c288129a88665838012cfb07b8981"},
+    {file = "pluggy-1.4.0.tar.gz", hash = "sha256:8c85c2876142a764e5b7548e7d9a0e0ddb46f5185161049a79b7e974454223be"},
+]
+
+[[package]]
+name = "pytest"
+version = "8.1.1"
+requires_python = ">=3.8"
+summary = "pytest: simple powerful testing with Python"
+groups = ["dev"]
+dependencies = [
+    "colorama; sys_platform == \"win32\"",
+    "exceptiongroup>=1.0.0rc8; python_version < \"3.11\"",
+    "iniconfig",
+    "packaging",
+    "pluggy<2.0,>=1.4",
+    "tomli>=1; python_version < \"3.11\"",
+]
+files = [
+    {file = "pytest-8.1.1-py3-none-any.whl", hash = "sha256:2a8386cfc11fa9d2c50ee7b2a57e7d898ef90470a7a34c4b949ff59662bb78b7"},
+    {file = "pytest-8.1.1.tar.gz", hash = "sha256:ac978141a75948948817d360297b7aae0fcb9d6ff6bc9ec6d514b85d5a65c044"},
+]
+
+[[package]]
+name = "tomli"
+version = "2.0.1"
+requires_python = ">=3.7"
+summary = "A lil' TOML parser"
+groups = ["dev"]
+marker = "python_version < \"3.11\""
+files = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
+]
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..fe1a660
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,25 @@
+[project]
+name = "stringdb"
+version = "0.1.0"
+description = "StringDB"
+authors = [
+    {name = "Hugo Cachitas",email = "hcachitas@gmail.com"},
+]
+dependencies = [
+]
+requires-python = ">=3.8"
+readme = "README.md"
+license = {text = "MIT"}
+
+[build-system]
+requires = ["setuptools>=61", "wheel"]
+build-backend = "setuptools.build_meta"
+
+
+[tool.pdm]
+distribution = true
+
+[tool.pdm.dev-dependencies]
+dev = [
+    "pytest>=8.1.1",
+]
diff --git a/src/stringdb/__init__.py b/src/stringdb/__init__.py
new file mode 100644
index 0000000..165f117
--- /dev/null
+++ b/src/stringdb/__init__.py
@@ -0,0 +1,3 @@
+from .api import API
+
+__all__ = ["API"]
diff --git a/src/stringdb/api.py b/src/stringdb/api.py
new file mode 100644
index 0000000..e9c0779
--- /dev/null
+++ b/src/stringdb/api.py
@@ -0,0 +1,68 @@
+import logging
+from typing import List, Optional
+
+logger = logging.getLogger(__name__)
+
+
+class API:
+    VERSION_ADDRESSES = {
+        "12.0": "https://string-db.org/",
+        "11.5": "https://version-11-5.string-db.org/",
+        "11.0b": "https://version-11-0b.string-db.org/",
+        "11.0": "https://version-11-0.string-db.org/",
+        "10.5": "https://version-10-5.string-db.org/",
+        "10.0": "https://version10.string-db.org/",
+    }
+
+    def __init__(self, version=None, client=None):
+        self.client = client
+
+        if version:
+            self.stable_address = self.VERSION_ADDRESSES[version]
+            self.version = version
+        else:
+            self.version = next(iter(self.VERSION_ADDRESSES))
+            self.stable_address = self.VERSION_ADDRESSES[self.version]
+
+    @property
+    def api_url(self):
+        return self.stable_address + "api"
+
+    def _get(self, endpoint: str, params: dict = {}):
+        url = "/".join([self.api_url, "json", endpoint])
+        logger.info("GET", url, params)
+        params.update(caller_identity=__name__)
+        if self.client:
+            response = self.client.get(url, params=params)
+            logger.info(response.status_code)
+            response.raise_for_status()
+            return response.json()
+        return (url, params)
+
+    def get_string_ids(
+        self,
+        identifiers: List[str],
+        species: int,
+        limit: int = 1,
+        echo_query: bool = True,
+    ):
+        params = {
+            "identifiers": "\r".join(identifiers),  # your protein list
+            "species": species,  # species NCBI identifier
+            "limit": limit,  # only one (best) identifier per input protein
+            "echo_query": echo_query,  # see your input identifiers in the output
+        }
+        return self._get("get_string_ids", params=params)
+
+    def get_interaction_partners(
+        self,
+        identifiers: List[str],
+        species: int,
+        # limit: Optional[int] = None,
+    ):
+        params = dict(
+            identifiers="\r".join(identifiers),
+            species=species,
+            # limit=limit,
+        )
+        return self._get("interaction_partners", params=params)
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_api.py b/tests/test_api.py
new file mode 100644
index 0000000..ecae87e
--- /dev/null
+++ b/tests/test_api.py
@@ -0,0 +1,46 @@
+import stringdb
+
+
+def test_default_version():
+    api = stringdb.API()
+
+    latest_version = next(iter(stringdb.API.VERSION_ADDRESSES))
+
+    assert api.version == latest_version
+
+
+def test_older_versions():
+    for version in ["10.0", "10.5", "11.0", "11.0b", "11.5"]:
+        api = stringdb.API(version)
+        assert api.version == version
+
+
+def test_default_url():
+    api = stringdb.API()
+    assert api.api_url == "https://string-db.org/api"
+
+
+def test_clientless_api():
+    api = stringdb.API()
+    assert api.client is None
+
+    result = api._get("endpoint", params=dict(param1="value", param2=9000))
+
+    assert len(result) == 2
+
+    url, params = result
+
+    assert url == api.api_url + "/json/endpoint"
+    assert params["param1"] == "value"
+    assert params["param2"] == 9000
+
+
+def test_get_string_ids():
+    api = stringdb.API()
+
+    url, params = api.get_string_ids(["edin"], species=7227)
+
+    assert url == api.api_url + "/json/get_string_ids"
+    assert params["identifiers"] == "edin"
+    assert params["species"] == 7227
+    assert params["caller_identity"] == "stringdb.api"