FLUX 1.1 Pro image generation
Black Forest Labs' workhorse pro model: excellent image quality, prompt adherence and variety, fast.
POST /api/v1/nodes/flux-1-1-pro
Two ways to use FLUX 1.1 Pro image generation
Way 1 · Pay per call (x402)
For AI agents, no sign-up
Your agent sends the request, gets a 402 with the exact price ($0.055), signs a USDC payment on Base and retries. Nothing is collected unless the call succeeds.
add TollNode to Claude Code, Cursor or Codex (once)
npx agentcash add https://tollnode.comor call it directly
npx agentcash@latest fetch https://tollnode.com/api/v1/nodes/flux-1-1-pro -m POST -b '{"prompt":"editorial photo of a highway at blue hour, long exposure light trails"}'Way 2 · Account + API key
For apps and teams
Create a free account, load a balance with USDC on Base, create an API key and call any node. Same prices; each successful call is deducted from your balance.
curl
curl -X POST https://tollnode.com/api/v1/nodes/flux-1-1-pro \
-H "Authorization: Bearer $TOLLNODE_API_KEY" \
-H "content-type: application/json" \
-d '{"prompt":"editorial photo of a highway at blue hour, long exposure light trails"}'Step-by-step, with code in JavaScript and Python: full guide for FLUX 1.1 Pro image generation.
Input
| Field | Type | Notes |
|---|---|---|
| seed | integer | |
| prompt* | string | What to create or change |
| aspect_ratio | enum | Aspect ratio, default 1:1 (1:1, 16:9, 3:2, 2:3, 4:5, 5:4, 9:16, 3:4, 4:3) |
| output_format | enum | (webp, jpg, png) |
Example response
{
"images": [
"https://tollnode.com/api/v1/files/00000000-0000-0000-0000-000000000000/0"
]
}FAQ
- What does the FLUX 1.1 Pro image generation node return?
- Black Forest Labs' workhorse pro model: excellent image quality, prompt adherence and variety, fast.
- How much does one call cost?
- $0.055 in USDC on Base, per successful call. No sign-up, subscription or API key.
- What happens if the call fails?
- You are not charged. TollNode checks your signed payment first, runs the node, and only collects the payment if the result is usable. A failed, empty or timed-out call is never settled, so there is nothing to refund.
- How does an AI agent pay?
- With x402. The first request returns HTTP 402 and the exact price. Any x402 wallet signs the USDC payment and retries automatically. In Claude Code or Cursor, run npx agentcash add https://tollnode.com once.
- Can I use an API key instead?
- Yes. Create a free account, add funds in USDC on Base, create an API key and send it as Authorization: Bearer. Each successful call is deducted from your balance at the same price; failed calls cost nothing.