Thousand API — Deterministic tools for AI agents

Deterministic tools for AI agents.

More reliable than AI inference. A lightweight utility API suite for developers and AI agents.

{
  "mcpServers": {
    "thousand-api": {
      "url": "https://mcp.thousand-api.com/mcp",
      "headers": { "x-api-key": "your-api-key" }
    }
  }
}

Save LLM tokens and ensure accurate results

When AI agents use tools, they get accurate results with fewer tokens than having the LLM process everything itself.

Two approaches to reducing tokens

① Use tools to reduce output tokens

e.g. 95% reduction with HTML→text extraction

② Turn off unused tools to reduce tool-definition tokens

Configure per category or per tool from the dashboard
All 55 tools → 20 tools cuts tool-definition tokens by about 64%

Common filtering presets:

Developer set (6 tools) → Security + Data processing
Document set (5 tools) → Text + Format conversion
Research set (5 tools) → Network

94%

Token reduction

HTML to text

64%

Token reduction

Postal code lookup

67%

Token reduction

Compound interest

60%

Token reduction

HMAC verification

Without tools

Input

8,200 TOKEN

Output

1,100 TOKEN

Total: 9,300 TOKEN

With tools

Input

380 TOKEN

Output

160 TOKEN

Total: 540 TOKEN

↑ 94% saved

See all scenarios →

What AI agents struggle with—done reliably

Three pillars that connect agents to the outside world without guesswork.

Live data

FX rates, IP geolocation, holidays—facts, not guesses.

Side effects

QR codes and generated assets agents cannot produce on their own.

Deterministic math

Distance, time zones, business days, JSON validation—same input, same output.

Use cases

Hand agents MCP tools for work that breaks when left to inference

AI assistant

Scheduling for AI assistants

Meeting times and reminders drift when agents infer business days, time zones, or cron schedules.

Related tools

Holiday & Business Day
Cron Parser

Learn more

AI marketing

Prep work for AI writers and marketers

Outlines and competitor research suffer when meta tags and post timing are guessed.

Related tools

Page Meta / OGP
QR Code Generator
Holiday & Business Day

Learn more

Cursor / Claude dev

Precise utilities for AI engineers

JSON, cron, and URLs in generated code introduce subtle spec mistakes.

Related tools

JSON Validator
Cron Parser
URL Redirect Resolver

Learn more

Chatbot

External sensors for chatbots

Bots lack live locale, link targets, and final URLs for short links.

Related tools

IP Geolocation
Page Meta / OGP
QR Code Generator
URL Redirect Resolver

Learn more

View all use cases

MCP Tools

Reliable utility MCP tools for AI agents and developers

70 MCP tools available

Date & Calendar

14 tools

Answer 'Is tomorrow a business day?' and 'When does this Cron run?' reliably

Holiday & Business Day
Timezone Conversion
Cron Parser
Current DateTime
+ 10 more

Text & String

12 tools

Regex testing, case conversion, and Japanese text conversion

Regex Tester
String Case Converter
Template Engine
Japanese Converter
+ 8 more

Convert & Format

11 tools

Format conversions for AI-generated data with zero tokens

YAML↔JSON
CSV↔JSON
Markdown→HTML
Unit Conversion
+ 7 more

Data Processing

7 tools

Extract values from large JSON, validate schemas, compute statistics

JSONPath Query
JSON Schema Validator
Stats Calculator
Array Diff
+ 3 more

Network & Infra

8 tools

Get URL safety, DNS records, and IP geolocation in real time

Page Meta / OGP
Exchange Rate
DNS Lookup
IP Geolocation
+ 4 more

Security & Auth

7 tools

Generate hashes, decode JWTs, and create random strings reliably

Hash Generation
JWT Decode
Random String
+ 4 more

Developer Utilities

11 tools

Distance, coordinates, color tools, and version comparison with deterministic results

Distance Calculator
Coordinate Conversion
Color Palette
Version Compare
+ 7 more

Tool names, endpoints, parameters, and response examples are in the

documentation →

Works as an MCP server

Connect directly to Claude or Cursor. Copy the config and your AI agent can call Thousand API tools right away.

Supported clients

Claude
Cursor
Other MCP-compatible tools

{
  "mcpServers": {
    "thousand-api": {
      "url": "https://mcp.thousand-api.com/mcp",
      "headers": { "x-api-key": "your-api-key" }
    }
  }
}

Pricing

50+ MCP tools free for up to 1,000 requests/month. Upgrade as you scale.

Free

Trial and light personal use

MCP server connection
REST API access
API keys1
Monthly requests1,000
Email support
Priority support

Get Started

Recommended

Starter

¥480/mo

Everyday personal use

MCP server connection
REST API access
API keys5
Monthly requests10,000
Email support
Priority support

Start Starter

Pro

¥1,980/mo

Power users and small teams

MCP server connection
REST API access
API keys20
Monthly requests100,000
Email support
Priority support

Start Pro

Get Started