vesselapi-python

Python client for the Vessel Tracking API: maritime vessel tracking, port events, emissions, and nautical infrastructure.

Resources: Documentation | API Explorer | Dashboard | Contact Support

Install

pip install vessel-api-python

Requires Python 3.9+.

Quick Start

from vessel_api_python import VesselClient

client = VesselClient(api_key="your-api-key")

# Search for a vessel by name.
result = client.search.vessels(filter_name="Ever Given")
for v in result.vessels or []:
    print(f"{v.name} (IMO {v.imo})")

# Get a port by UN/LOCODE.
port = client.ports.get("NLRTM")
print(port.port.name)

# Auto-paginate through port events.
for event in client.port_events.list_all(pagination_limit=10):
    print(f"{event.event} at {event.timestamp}")

Async

import asyncio
from vessel_api_python import AsyncVesselClient

async def main():
    async with AsyncVesselClient(api_key="your-api-key") as client:
        result = await client.search.vessels(filter_name="Ever Given")
        async for event in client.port_events.list_all(pagination_limit=10):
            print(f"{event.event} at {event.timestamp}")

asyncio.run(main())

Available Services

33 methods total, one per API endpoint, plus 28 auto-pagination iterators.

Required Parameters

Parameters the API requires are keyword-only with no default, so leaving one out raises TypeError at the call instead of returning HTTP 400 from the server:

client.location.vessels_radius(latitude=51.9225, longitude=4.47917, radius=10000)
client.location.vessels_radius(latitude=51.9225)  # TypeError: missing longitude, radius

This covers the geo bounds on every location method (lat_min, lat_max, lon_min, lon_max for bounding boxes; latitude, longitude, radius for radius queries), filter_name on search.dgps, search.light_aids, search.modus and search.radio_beacons, filter_port_name on port_events.by_ports, filter_vessel_name on port_events.by_vessels, and filter_ids on vessels.positions, along with the matching all_* iterators. filter_id_type is required by the API but keeps its "imo" default, since the SDK always sends it.

Vessel Lookup & Location

# Get vessel details by IMO number (defaults to IMO; pass filter_id_type="mmsi" for MMSI).
vessel = client.vessels.get("9811000")
print(f"{vessel.vessel.name} ({vessel.vessel.vessel_type})")

# Get a vessel's latest stored AIS position. A vessel that exists may have no
# stored position, which raises VesselNotFoundError rather than returning empty.
pos = client.vessels.position("232003239", filter_id_type="mmsi")
print(f"Position: {pos.vessel_position.latitude}, {pos.vessel_position.longitude}")

# filter_sat=True falls back to satellite AIS when nothing is stored.
# ⚠️ Satellite lookups draw on a prepaid balance and are charged per call.
# Omit it unless you need that fallback.

# Find all vessels within 10 km of Rotterdam.
nearby = client.location.vessels_radius(latitude=51.9225, longitude=4.47917, radius=10000)
for v in nearby.vessels or []:
    print(f"{v.vessel_name} at {v.latitude}, {v.longitude}")

Search

search.vessels accepts q, a unified search across IMO, MMSI, ENI, callsign and name. One value can return several vessels, and _meta.matched_on maps each result's index to the fields it matched on.

res = client.search.vessels(q="4606770")
print(res.meta.matched_on)  # {"0": ["eni"]}

Filters the API declares as repeatable take either one value or a list. A list is sent as a repeated query parameter, so the values are OR-ed:

# ?filter.flag=PA&filter.flag=LR&filter.vesselType=Container%20Ship
client.search.vessels(filter_flag=["PA", "LR"], filter_vessel_type="Container Ship")

client.search.ports(filter_country=["NL", "BE"], filter_size=["LARGE", "MEDIUM"])

These are filter_flag and filter_vessel_type on search.vessels; filter_country, filter_port_type, filter_size, filter_harbor_size and filter_harbor_use on search.ports; and filter_ids on vessels.positions, which also accepts the comma-separated single-string form.

Error Handling

All methods raise specific exception types on non-2xx responses:

from vessel_api_python import VesselAPIError

try:
    client.ports.get("ZZZZZ")
except VesselAPIError as err:
    if err.is_not_found:
        print("Port not found")
    elif err.is_rate_limited:
        print("Rate limited, backing off")
    elif err.is_auth_error:
        print("Check API key")
    print(err.status_code, err.message)

Auto-Pagination

Every list endpoint has an all_* / list_all variant returning an iterator:

# Sync
for vessel in client.search.all_vessels(filter_vessel_type="Tanker"):
    print(vessel.name)

# Async
async for vessel in client.search.all_vessels(filter_vessel_type="Tanker"):
    print(vessel.name)

# Collect every match at once. pagination_limit is the page size, not a total:
# .collect() walks to the end, so this is one request per page until exhausted.
vessels = client.search.all_vessels(filter_vessel_type="Tanker", pagination_limit=50).collect()

# To take a fixed number, stop the iterator yourself.
from itertools import islice

first_50 = list(islice(client.search.all_vessels(filter_vessel_type="Tanker"), 50))

Configuration

client = VesselClient(
    api_key="your-api-key",
    base_url="https://custom-endpoint.example.com/v1",
    timeout=60.0,
    max_retries=5,  # default: 3
    user_agent="my-app/1.0",
)

Retries use exponential backoff with jitter on 429 and 5xx responses. The Retry-After header is respected.

Documentation

• API Documentation: endpoint guides, request/response schemas, and usage examples
• API Explorer: interactive API reference
• Dashboard: manage API keys and monitor usage

Contributing & Support

Found a bug, have a feature request, or need help? You're welcome to open an issue. For API-level bugs and feature requests, please use the main VesselAPI repository.

For security vulnerabilities, do not open a public issue. Email security@vesselapi.com instead. See SECURITY.md.

Data Sources & Attribution

Emissions and casualty data: © European Union. Source: European Maritime Safety Agency (EMSA): THETIS-MRV (EU MRV, Regulation (EU) 2015/757) and the European Marine Casualty Information Platform (EMCIP). Reused under the European Commission reuse notice (Commission Decision 2011/833/EU), which authorises reuse for commercial and non-commercial purposes with acknowledgement of the source. Data may be transformed and combined; EMSA does not endorse this service.

License

MIT