What does the AI humanizer API do?

It rewrites AI-generated text into natural prose over a single REST call. You send the text, the API returns the humanized version as JSON. It is the same engine that runs behind TextPulse itself.

How do I get an API key?

Fill in the access form on this page with your name, email and a short note on what you are building. Keys are issued per project, and we usually reply within one business day.

What does the AI humanizer API cost?

Credits are prepaid in word packs, starting at $28 for 100,000 words and dropping to $0.20 per thousand on the largest pack. There is no monthly fee and no subscription to hold.

How is my usage counted?

You are charged for the words you send, not the words that come back, so a longer rewrite never costs extra. If a request fails, its words go straight back onto your balance.

Do my credits expire?

No. A balance stays on the key until you spend it, and it covers every language and writing mode the API supports.

How much text can I send at once?

Up to 1,000 words per request. Longer documents are sent as a series of calls, which also keeps each response quick.

Built for developers

AI Humanizer API

Humanize AI text inside your own product with a single REST call. The AI humanizer API exposes the engine that powers TextPulse to your backend: JSON goes in, rewritten prose comes back, across more than 60 languages.

Request API access Read the example

POSThttps://textpulse.ai/api/v1/humanize

Making your first request

Authenticate with an Authorization: Bearer header and post your text. The rewritten version returns as outputText alongside the metering figures for that call.

curl https://textpulse.ai/api/v1/humanize \  -H "Authorization: Bearer tp_live_YOUR_KEY" \  -H "Content-Type: application/json" \  -d '{    "text": "Our analysis indicates the intervention produced gains...",    "writingMode": "Academic",    "intensityScalar": 0.5  }'

200 OKapplication/json

{  "outputText": "Our analysis points to measurable gains from the...",  "metrics": {    "inputWords": 128, "outputWords": 134,    "wordsCharged": 128, "balanceRemaining": 99872,    "modelLatencyMs": 4310, "route": "v1/humanize"  }}

What the AI humanizer API handles for you

Language routing, register control, metering and retry safety are part of the endpoint, so your integration stays a single function.

One route covers 60+ languages

English runs on the fine-tuned humanizer engine. Pass a language value and the request is routed to the multilingual path instead, so a non-English product page reaches the same endpoint without a second integration.

Register and strength are parameters

Five writing modes cover the Academic, Corporate, Creative, Blog/SEO and General registers. The intensityScalar value sets how different the rewrite is from the source and takes one of 0, 0.25, 0.5, 0.75 or 1, running from Mild through the Balanced default at 0.5 up to Aggressive.

One POST per document

There is no job queue to poll and no webhook to register. The humanize call holds the connection until the model returns and answers with the rewritten text, so a single request completes the work.

Retries do not charge twice

Send a requestId and the result is cached against it for about ten minutes. A repeat of the same identifier inside that window replays the stored response rather than running the model again, and any request the engine fails to complete returns its words to your balance automatically.

Endpoint reference

Both routes read your key from an Authorization: Bearer header. Keys begin tp_live_ and are issued per project.

POST/api/v1/humanize

Rewrite AI-generated text into natural prose.

GET/api/v1/balance

Read the word credits left on your key.

A single humanize call accepts up to 1,000 words within a 10,000 character ceiling, and each key may issue 60 requests per minute. Longer documents are sent as a sequence of calls.

AI humanizer API pricing

Credits are prepaid and drawn down by the word. Billing counts what you send rather than what the engine returns, and any call that fails to produce a rewrite is credited back to the key.

Starter

$28

100K words

$0.28 per 1,000 words

Growth

$125

500K words

$0.25 per 1,000 words

Pro

$440

2M words

$0.22 per 1,000 words

Best valueScale

$2,000

10M words

$0.20 per 1,000 words

Credits are valid for 12 months from purchase, and cover every language, writing mode and English variant the endpoint supports. For sustained volume or a white-label arrangement inside your own product, request access and we will quote against your monthly figure.

AI humanizer API questions

Get your API key

Keys are issued per project. Describe what you are building and we will reply within 24 hours.