Know what any API costs
before you build

Pricing, free tiers and step-by-step setup for hundreds of developer APIs — from GPT and Claude to Twilio and Stripe. Plus free cost calculators.

🤖 AI & LLMs 💬 SMS & Email 🗺️ Maps 💳 Payments 📈 Data & Finance 🔍 Search & Scraping

AI API Cost Calculator

Estimate what GPT, Claude, Gemini and other LLM APIs cost for your usage — and see which model is cheapest for your workload.

—per request
—per day
—
per month
—per year
ModelIn $/1MOut $/1MCost / month
⚠️ Reference prices (June 2026). LLM API prices change often and vary by tier, context length and region. Always confirm on the provider's pricing page — or type your exact rates above.

Popular APIs

All guides →

Each guide: what it does, how to get a key, real pricing and the free tier.

AI

OpenAI

AI & LLMs
GPT-4o, GPT-4o mini, o-series. The most widely used LLM API.
from $0.15/1M
View guide →
CL

Anthropic Claude

AI & LLMs
Claude Opus, Sonnet, Haiku. Strong reasoning and long context.
from $0.80/1M
View guide →
GE

Google Gemini

AI & LLMs
Gemini 2.5 Pro & Flash. Generous free tier on AI Studio.
from $0.10/1MFree tier
View guide →
TW

Twilio

SMS & Voice
Programmable SMS, voice and WhatsApp.
SMS from $0.0079
View guide →
ST

Stripe

Payments
Card payments and billing.
2.9% + $0.30No monthly fee
View guide →
SG

SendGrid

Email
Transactional and marketing email.
from $0/moFree tier
View guide →

How it works

1

Find the API

Search or browse by category to find the service you need — AI, SMS, maps, payments and more.

2

See real pricing & free tier

Clear pricing tables, what's free, and a calculator to estimate your actual monthly cost.

3

Get your key

Follow the step-by-step setup guide to sign up and grab your API key in minutes.