API LIVE · api.bitsabhi.com

Within 0.13% of LKH-3.
Route optimization for any domain.
In Rust.

Logistics, chip design, DNA sequencing, warehouse picking, CNC toolpaths — if you need optimal ordering, Lambda-G solves it. One API call. Coordinates or distance matrix.

GET API KEY → VIEW DOCS

TRY IT LIVE

Click anywhere to place cities, then hit Optimize to see the route.

📍

Click to drop cities or press R for random

Cities

Tour

—

BENCHMARK — 1,000 CITIES · SAME TIME · SAME HARDWARE

0.13%

gap to LKH-3 on 1000-city benchmark

EXACT

match with LKH-3 on kroA100 (21,907)

LKH-3 (state-of-the-art) 23,342

★ Lambda-G v15 23,373

Google OR-Tools 23,917

Nearest-Neighbour 28,452

Lower is better. Tour length on shared_benchmark.tsp (1000 cities). Time limit: 60s. Same hardware.
Algorithm: Iterated local search with 2-opt, Or-opt, and double-bridge perturbation.

TSPLIB BENCHMARK RESULTS

INSTANCE	CITIES	LKH-3	LAMBDA-G	GAP
kroA100	100	21,907	21,908	0.005%
pr1002	1002	259,045	261,921	1.11%
shared_benchmark	1000	23,342	23,373	0.13%

All tests run with 60s time limit. kroA100 matches LKH-3 exactly.

RESPONSE TIME (API LATENCY)

~0.5s

100 cities

~3s

1,000 cities

~25s

10,000 cities

Includes cold-start. Warm instances are 2-3x faster.

optimize.py

# JSON mode — coordinates
import httpx

result = httpx.post("https://api.bitsabhi.com/optimize",
    headers={"Authorization": "Bearer YOUR_KEY"},
    json={"points": [[0,0],[100,0],[100,100],[0,100]],
          "time_limit": 25.0}
).json()

# CSV mode — upload your file directly
result = httpx.post("https://api.bitsabhi.com/optimize",
    headers={"Authorization": "Bearer YOUR_KEY"},
    files={"csv": open("cities.csv", "rb")}
).json()

# Both return the same response
print(result["tour"])        # [0, 3, 1, 2] — optimal order
print(result["length"])      # 341.42
print(result["improvement"])  # 17.6 (% vs nearest-neighbour)

USE CASES

One solver. Every domain.

If you need optimal ordering of points, Lambda-G solves it.

🚚
Logistics & Delivery
Last-mile delivery, field service routing, fleet optimization. Minimize fuel, time, and driver hours.

📦

Warehouse Picking

Order fulfillment paths, picker routes. Maximize picks per hour in Amazon-style warehouses.

⚡

Chip Design / VLSI

PCB drilling sequences, wire routing between components. Minimize total wire length.

🔬

DNA Sequencing

Fragment ordering in genome assembly. Minimize overlap distance for sequence reconstruction.

🏭

CNC / Laser / 3D Printing

Toolpath optimization for cutting heads, laser paths, print sequences. Reduce machine wear and time.

🔭

Telescope Scheduling

Satellite pointing sequences, observatory scheduling. Minimize slew time between targets.

INPUT MODES

Send data any way you have it.

Coordinates, CSV, or distance matrix. We handle the rest.

📄
CSV Upload
Upload your .csv file directly. Two columns: x,y or lat,lng. Header optional. No preprocessing needed.
MULTIPART FORM

{ }

JSON Coordinates

Send a list of [x,y] pairs. Works with any coordinates — Euclidean, lat/lng, or warehouse positions.

APPLICATION/JSON

⊞
Distance Matrix
Send an n×n matrix when distance isn't Euclidean. Works for road networks, genomics, finance.
APPLICATION/JSON

📐

TSPLIB Format

Upload .tsp files directly. Same format used by academic benchmarks.

COMING SOON

CSV format: Two columns, comma separated. First row can be a header (auto-detected). Supports x,y · lat,lng · longitude,latitude · id,x,y (id column ignored). Max file size 10MB.

API DOCUMENTATION

Complete API Reference

Base URL: https://api.bitsabhi.com

POST /optimize

Optimize a TSP tour. Send coordinates as JSON or upload a CSV file.

HEADERS

NAME	TYPE	DESCRIPTION
Authorization	required	Bearer YOUR_API_KEY
Content-Type	string	application/json or multipart/form-data

JSON BODY

PARAM	TYPE	DESCRIPTION
points	required	Array of [x, y] coordinates. Example: [[0,0], [100,0], [100,100]]
time_limit	float	Max optimization time in seconds. Default: 25.0
seed	int	Random seed for reproducibility. Default: 137
return_tour	bool	Include tour array in response. Default: true

CSV UPLOAD (multipart/form-data)

FIELD	TYPE	DESCRIPTION
csv	required	CSV file with x,y columns
time_limit	float	Max optimization time in seconds

No data? Try our sample files:

sample_20cities.csv sample_50cities.csv

RESPONSE

{ "tour": [0, 3, 1, 2], // Optimal visit order (indices) "length": 341.42, // Total tour distance "improvement": 17.6, // % improvement vs nearest-neighbor "nn_baseline": 414.21, // Nearest-neighbor baseline length "elapsed": 2.34, // Actual compute time (seconds) "cities": 4, // Number of cities "algorithm": "v15-quantum-rust" }

GET /health

Check API status. No authentication required.

{ "status": "ok", "service": "lambda-g-api", "version": "2.1.0", "algorithm": "v15-quantum" }

GET /usage

Get your API key usage statistics.

HEADER	TYPE	DESCRIPTION
Authorization	required	Bearer YOUR_API_KEY

{ "email": "you@example.com", "plan": "builder", "max_cities": 1000, "lifetime": true, "history": [ {"date": "2026-03-10", "calls": 42, "cities_sum": 12500} ] }

ERRORS HTTP Status Codes

CODE	MEANING	DESCRIPTION
200	Success	Request completed successfully
400	Bad Request	Invalid JSON, missing points, or less than 3 cities
401	Unauthorized	Missing or invalid API key
403	Forbidden	Plan limit exceeded (too many cities)
500	Server Error	Internal error — contact support
503	Unavailable	Compute backend temporarily down

Plan Limits:
Free: 100 cities, 5s · Research: 500 cities, 25s · Builder: 1,000 cities, 25s · Pro: 10,000 cities, 60s · Enterprise: Unlimited

PRICING

Simple. No subscriptions.

Pay once, use forever. No renewals, no surprises. Your API key works for life.

FREE

forever

Up to 100 cities
JSON + CSV input
5s time limit
Email support

RESEARCH

forever · .edu email required

Up to 500 cities
Unlimited API calls
25s time limit
Cite us in your papers
Email support

Within 0.13% of LKH-3.Route optimization for any domain.In Rust.

One solver. Every domain.

Send data any way you have it.

Complete API Reference

HEADERS

JSON BODY

CSV UPLOAD (multipart/form-data)

RESPONSE

Simple. No subscriptions.

Terms & Conditions

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Within 0.13% of LKH-3.
Route optimization for any domain.
In Rust.