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Text & Language APIs · 5 APIs

Developer Text & Natural Language Processing AI REST APIs

Natural language processing REST APIs for translation, grammar enhancement, text summarization, and data redaction.

Typical Response
1-3 s
Language Coverage
50+ Global
Model Training
Never on your data
POST /api/v1/ai/translation
{
    "text": "Your order has shipped and will arrive on Friday.",
    "target_language": "es"
}
200 OK response.json
{
    "data": {
        "result": {
            "detected_language": "en",
            "translation_applied": true,
            "translated_text": "Tu pedido ha sido enviado y llegará el viernes.",
            "target_language": "es"
        }
    }
}

Text & Language APIs: 5 APIs

1 credit per call. Each one has its own page with parameters, code and examples.

  • Live

    Intent Detection

    Detect user intent from natural language messages for routing, support, and workflow automation.

    POST /api/v1/ai/intent-detection
    1 credit 1,000 free / mo Docs Try it
  • Live

    Translation

    Translate text between multiple languages using AI for high-quality contextual translations.

    POST /api/v1/ai/translation
    1 credit Docs Try it
  • Live

    Sentiment Analysis

    Analyze the emotional tone of text to identify positive, negative, neutral, or mixed sentiments.

    POST /api/v1/ai/sentiment-analysis
    1 credit 1,000 free / mo Docs Try it
  • Live

    Text Summarization

    Condense long-form text, articles, or transcripts into configurable summaries and optionally extract structured data.

    POST /api/v1/ai/text-summarize
    1 credit Docs Try it
  • Live

    Grammar Fix

    Automatically correct spelling, grammar, and punctuation while optionally adjusting tone and dialect.

    POST /api/v1/ai/grammar-fix
    1 credit Docs Try it
Definition

What are the Text & Language APIs?

RSFlowHub Text & Language APIs provide a multi-model REST gateway for high-throughput natural language processing tasks including multi-lingual translation across 50+ languages, context-aware grammar correction, recursive document summarization, and regex-free PII masking. All endpoints return a consistent JSON envelope, route requests across multiple AI providers with automatic fallback, and never use your text to train AI models.

APIs
5
Price
1 credit per call
Authentication
X-API-Key header
Format
JSON in, JSON out
Typical response
1 to 3 seconds
Fallback
Automatic, failed calls not charged

Quickstart

A real request to POST /api/v1/ai/translation. Every API in this category works the same way.

request.sh
curl -X POST "https://rsflowhub.com/api/v1/ai/translation" \
  -H "X-API-Key: rfh_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"text":"Your order has shipped and will arrive on Friday.","target_language":"es"}'
response.json
{
    "success": true,
    "request_id": "req_3f9a2c7e-5b1d-4e8a-9c2f-7d6e1a0b4c8d",
    "data": {
        "result": {
            "detected_language": "en",
            "translation_applied": true,
            "translated_text": "Tu pedido ha sido enviado y llegará el viernes.",
            "target_language": "es"
        }
    },
    "meta": {
        "version": "v1",
        "timestamp": "2026-10-05T09:30:00Z"
    }
}

Why teams use Text & Language APIs

Fast, Predictable Responses

Managed AI gateway with provider fallback for real-time text processing.

Context-Aware Translation & Editing

Understands nuance, idioms, and technical terms across 50+ languages.

Enterprise Privacy & PII Redaction

Automatically detects and masks sensitive personal data (emails, SSNs, credit cards).

Use cases

Typical pipelines built with Text & Language APIs.

Automated Multilingual Content Localization

Translate user-generated reviews, marketing copy, and knowledge base articles across 50+ languages while preserving brand terminology and tone.

  1. User Input
  2. Text Translate API (preserve formality)
  3. Localized CMS Entry

Enterprise Document Summarization

Condense lengthy legal contracts, customer support call logs, and technical whitepapers into digestible bulleted summaries with key takeaways.

  1. Unstructured Text
  2. Summarize API (bullet mode)
  3. Structured JSON Summary

Real-Time Customer Support Sentiment Triage

Analyze inbound support tickets and chat transcripts in real-time to detect customer frustration, prioritize urgent SLAs, and route to specialized human agents.

  1. Incoming Message
  2. Sentiment Analysis API
  3. High-Priority Support Queue

Zero-Trust PII & Sensitive Data Redaction

Mask personally identifiable information (credit cards, phone numbers, SSNs, medical IDs) prior to saving records into vector databases or third-party analytics.

  1. Raw Payload
  2. Redact API (regex + NER)
  3. Masked Safe Payload

RSFlowHub vs provider SDKs vs self-hosting

How the Text & Language APIs compare with calling a provider directly or running your own models.

TopicRSFlowHubProvider SDKSelf-hosted
Global Model Failover Automatic 3-State Circuit BreakerManual Client Try/CatchComplex k8s Multi-Region
Payload Contract Strict Validated JSON SchemaRaw Markdown / Chat DriftCustom FastAPI Wrapper
Authentication 1 Unified Master API KeyMultiple Provider API KeysCustom OAuth / Vault Setup
PII Masking & Privacy Redact PII Before It Reaches LogsDefault Vendor Logging Opt-InYour own servers (high infra cost)
Billing & Credits Pre-Authorized Universal WalletFragmented Monthly InvoicesFixed 24/7 Idle GPU Compute

Frequently asked questions

Which languages are supported by the Text & Language APIs?
RSFlowHub Text & Language APIs support over 50 major global languages including English, Spanish, French, German, Japanese, Chinese, Hindi, Arabic, and Portuguese with automatic source language detection.
How are credits deducted for Text & Language APIs?
Standard NLP text calls consume 1 base credit per request up to 2,000 input characters. Longer text batches automatically calculate predictable tiered credit usage with full pre-authorization locking.
Does RSFlowHub store or train models on our submitted text?
No. RSFlowHub does not use your text to train AI models. Request text is sent to the selected AI provider only to produce the result, usage metadata (character counts and credits) is logged for billing, and identical requests may be cached for up to 24 hours so repeats cost less.
Can I customize the formality or tone of translated text?
Yes. You can pass the optional formality parameter ("formal", "informal", "professional") to instruct the translation engine to adapt pronouns, honorifics, and vocabulary according to your target audience.
What is the average response latency for real-time text processing?
Most requests complete in 1 to 3 seconds, depending on input length and the AI model. Identical repeat requests are served from cache and return faster.

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Build with Text & Language APIs

Free plan with 100 credits/month + 1,000 bonus credits when you sign in before 23 Nov. One key works for every API in every category.

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