FAL.ai Concurrent Request Bug: Stuck IN_PROGRESS Slots With No Fix — Developers Are Switching

#webdev #api #python #ai

On March 24, 2026, a developer opened GitHub issue #939 on the fal-ai repository with a critical reliability report: after revoking their API key on fal.ai, 6 requests remained stuck in IN_PROGRESS state and continued consuming concurrent request slots.

The problem? There is no self-service way to clear these stuck slots. As of this writing, the issue remains open with no fix deployed.

Why This Matters for Developers

Concurrent request limits directly affect throughput and billing. If stuck slots cannot be released, developers face:

Quota lockout - you cannot make new requests because ghost slots are eating your limit
Billing confusion - stuck requests may continue to accrue charges
Security risk - teams that rotate API keys for security reasons are especially vulnerable

In production environments, this kind of cascading failure can take down your entire pipeline.

What to Look for in a Reliable AI API

Before choosing an AI inference provider, ask these questions:

Does revoking a key immediately release all associated resources?
Can you see and manage your active request slots?
Can you cancel stuck requests without contacting support?
Is there a public status page with real-time updates?
Is pricing predictable with no surprise charges?

NexaAPI: The Reliable Alternative

NexaAPI is built with developer reliability in mind. With 56+ models, the cheapest pricing in the market ($0.003/image), and clean Python + Node.js SDKs, it is the straightforward alternative for developers who need APIs that just work.

Available on RapidAPI for easy integration and billing management.

Python Example

# Install: pip install nexaapi
from nexaapi import NexaAPI

client = NexaAPI(api_key="YOUR_NEXAAPI_KEY")

# Generate an image - no stuck slots, no ghost requests
response = client.image.generate(
    model="flux",
    prompt="A futuristic cityscape at sunset",
    width=1024,
    height=1024
)

print(response.image_url)

JavaScript Example

// Install: npm install nexaapi
import NexaAPI from "nexaapi";

const client = new NexaAPI({ apiKey: "YOUR_NEXAAPI_KEY" });

// Generate an image - clean, reliable API calls
const response = await client.image.generate({
  model: "flux",
  prompt: "A futuristic cityscape at sunset",
  width: 1024,
  height: 1024
});

console.log(response.imageUrl);

Pricing Comparison

Provider	Image Generation	Concurrent Slot Bug?	Self-Service Recovery?
FAL.ai	~$0.03+/image	YES (open issue)	No
NexaAPI	$0.003/image	No	Yes

NexaAPI is 10x cheaper than fal.ai and does not trap you with unrecoverable stuck requests.

Switch to NexaAPI Today

Website: nexa-api.com
RapidAPI Hub: rapidapi.com/user/nexaquency
Python SDK: pip install nexaapi - pypi.org/project/nexaapi
Node.js SDK: npm install nexaapi - npmjs.com/package/nexaapi

Reference: fal-ai/fal GitHub Issue #939 - opened March 24, 2026, still open

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