Nitro API

What is Nitro API?

Nitro API is a human translation API built specifically for AI agents. It lets agents send translation requests and receive publication-ready results from professional native-speaker translators across 80+ languages. The standout feature: no API key or account is required. The agent handles the entire flow autonomously, including payment via MPP (Money Payment Protocol), making it the only human translation API designed for fully agentic workflows.

Application scenarios

Automated content localization
AI agents can translate HTML, JSON, XML, and iOS strings while preserving markup and structure.
E-commerce product pages
Translate product descriptions into multiple languages without breaking formatting or keys.
Legal and compliance documents
Get accurate translations with specialized domain knowledge and built-in QA.
Marketing and brand campaigns
Native speakers adapt tone, persuasion, and style so copy resonates emotionally.
Gaming and software localization
Translators handle specialized terminology that AI often hallucinates.
Customer support workflows
Agents can place translation orders and poll for results automatically within 2–24 hours.

Core Features

No API key required
Agents can call the API without authentication headers or account creation.
Agentic payment flow
The API returns a 402 Payment Required challenge with a WWW-Authenticate header; agents obtain a payment token from any MPP-compatible provider and retry with an Authorization header.
80+ supported languages
Professional native-speaker translators cover a broad language range.
Cultural fluency
Translators understand idioms, humor, and local context so content sounds natural, not machine-translated.
Domain expertise
Specialized knowledge for legal, medical, financial, and gaming content reduces hallucinated terminology.
Accountability built in
Every translation includes QA and revisions, which matters for legal liability and brand reputation.
Complex format preservation
HTML, JSON, XML, and iOS strings keep their structure while only the content is translated—no broken tags or corrupted keys.
2–24 hour turnaround
Not instant, but fast enough for production workflows; agents place orders, poll status, and pick up results automatically.
Order polling
After payment, agents poll each order via GET /orders/{id} until status shows DONE with the target text.

Target users

Nitro API is built for developers and teams building AI agents that need high-quality, human-verified translations without manual intervention. It suits product teams localizing software, e-commerce operators translating catalogs, legal and medical content teams requiring accuracy, and marketing departments that need brand-voice-consistent copy. Anyone who wants to offload translation to an autonomous agent—without managing API keys or dashboards—will find this useful.

How to use Nitro API?

The workflow is fully documented for bash, curl, Node.js, and Python:

Send a translation request: POST to https://api.nitrotranslate.com/v1/translate with source language, target languages, and resource data. No auth header needed.
Handle the payment challenge: The API responds with 402 Payment Required and a WWW-Authenticate header containing a payment challenge.
Get a payment token: Your agent obtains a token from any MPP-compatible provider and builds a base64url credential.
Retry with payment: Resend the same body with an Authorization: Payment header. You'll get a 200 OK with order IDs.
Poll for results: Check each order via GET /orders/{id} until status returns DONE with the translated text.

No signup, no dashboard, no API key management. The entire flow is agent-driven.

Effect review

Nitro API fills a genuine gap: most translation APIs are either machine-only or require human-in-the-loop setup. By removing API keys and account creation, it lets AI agents operate truly autonomously while still delivering human-quality output. The 2–24 hour turnaround is a reasonable trade-off for publication-ready translations with QA and revisions included. The format-preservation support for HTML, JSON, XML, and iOS strings is a practical touch that saves developers from broken markup. For teams building agentic workflows that need reliable, culturally fluent translations, Nitro API offers a clean, well-documented solution—assuming your agent can handle MPP payment integration.

Frequently Asked Questions

What is Nitro API and how does it work?

Nitro API is a human translation API designed for AI agents. It connects your AI system to professional native-speaker translators, supporting over 80 languages. It requires no API key or account, and operates on an agentic pay-as-you-go model.

Do I need an API key or account to use Nitro API?

No, Nitro API is designed to be frictionless. You can start using it without creating an account or obtaining an API key, simplifying integration into your AI workflows.

What languages does Nitro API support?

Nitro API supports over 80 languages, ensuring broad coverage for global translation needs, with translations performed by native speakers for accuracy and nuance.

How does the agentic pay-as-you-go model work?

The agentic pay-as-you-go model means you only pay for the translations you use, with pricing based on usage. It's designed to be cost-effective and flexible, allowing AI agents to request translations on demand without subscription commitments.

Can Nitro API be integrated with any AI agent?

Yes, Nitro API is built specifically for AI agents and can be easily integrated into various AI systems, chatbots, or automated workflows via its API endpoints, regardless of the underlying framework.

What quality of translation can I expect from Nitro API?

Nitro API uses professional native-speaker translators, ensuring high-quality, contextually accurate translations that are superior to machine-only translations, especially for nuanced or industry-specific content.