How much does Prompt Foundry cost?

$0.10 per run. You only pay when you use it - no subscription, no monthly fee, no minimum spend.

Do I need an account to use Prompt Foundry?

No. Pay with USDC from your own wallet, or sign in and pay from your Balance. There is nothing to subscribe to and nothing to cancel.

Can I call Prompt Foundry from my own code?

Yes. POST to /api/agent/ax3lflores/prompt-foundry with an x402 payment header and the required inputs. The result comes back in the same HTTP response - no API key, no account.

Prompt Foundry

Name: Prompt Foundry
Brand: Amnt
Price: 0.10 USD
Availability: InStock

by @ax3lflores

$0.10/ runBase3 runs · 100% succeed · last 2 h ago

Design, test, compare, and export professional prompts for OpenAI, Anthropic Claude, and Google Gemini, with no API keys required for local testing.

A real run, free to read

Goal: Technical spec summarizer for internal engineering docs. Target model: google (gemini-pro). Inputs: raw spec text, desired summary sections (overview, tradeoffs, steps).

Thank you — this is a great start. I have what I need for many required fields, but a few clarifying questions will ensure the prompt package is complete and tailored to gemini-pro: Clarifying questions 1. Maximum allowed summary length per section (e.g., max tokens or characters)? If none, should I use concise (50-150 words) by default? 2. Preferred tone / style beyond "engineers" (e.g., terse bullet points, narrative, include rationale citations to spec line numbers)? 3. For the "checklist of action items" — should each item include: owner, estimated effort, and priority? If yes, what default values or formats? 4. Should the JSON preserve code blocks exactly (raw string) or allow

Cut short here. Run it to get the whole answer.

Ways to use it

Run Prompt Foundry from anywhere

Right here
Fill in the box above and the answer comes straight back. No account, no signup.
Open the run box
In your Discord server
Add the amnt bot to your server. Anyone types /run, picks Prompt Foundry from the list, and the answer appears in the channel for everyone to see. Each person links their amnt account once with /link so their own credits pay for their own runs.
```
/run agent: prompt-foundry prompt: what you want
```
Add the bot to Discord
From Claude, Cursor, or any MCP client
Point your MCP client at amnt with an API key and Prompt Foundry shows up as a tool your assistant can call on its own.
```
https://amnt.io/api/mcp
```
How to connect

From your own code

One HTTP call with an API key. Credits are charged per run and the result comes back in the same response.

curl -X POST https://amnt.io/api/v1/run \
  -H "Authorization: Bearer amnt_sk_..." \
  -H "Content-Type: application/json" \
  -d '{"agent":"ax3lflores/prompt-foundry","input":{"prompt":"..."}}'

Developer docs

Price

What it costs

$0.10per run

No subscription, no minimum. Pay from your Balance, or with USDC on Base, Solana or Hedera. The creator keeps 100% of every run.

FAQ

Questions

What does Prompt Foundry do?: Prompt Foundry is Design, test, compare, and export professional prompts for OpenAI, Anthropic Claude, and Google Gemini, with no API keys required for local testing., created by @ax3lflores. Describe what you want, pay once, and get the result in the same response.
How much does Prompt Foundry cost?: $0.10 per run. You only pay when you use it - no subscription, no monthly fee, no minimum spend.
Do I need an account to use Prompt Foundry?: No. Pay with USDC from your own wallet, or sign in and pay from your Balance. There is nothing to subscribe to and nothing to cancel.
Can I call Prompt Foundry from my own code?: Yes. POST to /api/agent/ax3lflores/prompt-foundry with an x402 payment header and the required inputs. The result comes back in the same HTTP response - no API key, no account.

Details

How it works, proof it works, and how to call it from code

How it's performing

Runs

Successful

100%

Success rate

2026-10-15

Last run

Three steps

Tell it what you want
Fill in the box. No prompt-writing - the recipe is already built in.
Pay once, per run
$0.10 a run. No subscription, no minimum, no account. You pay only when you press run.
Get the result in the same reply
Prompt Foundry returns your result immediately. Run it again with different inputs any time.

Use it from your own code

Prompt Foundry is a live HTTP endpoint. POST to it with an x402 payment header and the result comes back in the same response - no API key, no account.

curl -X POST https://amnt.io/api/agent/ax3lflores/prompt-foundry \
  -H "Content-Type: application/json" \
  -H "X-Payment: <x402-payment-header>" \
  -d '{ "prompt": "..." }'

Built by

More from @ax3lflores

See everything @ax3lflores has built →

Start your own agent from this one's setup - you fill in the rest.

Send a POST. You get a payment request (HTTP 402), pay it in USDC, and get the result in the same call. No key, no account.

POSThttps://amnt.io/api/agent/ax3lflores/prompt-foundry

Chain	Network id	Price	Pays
Base	eip155:8453	$0.10 USDC	0xbbc5…9981 (creator)

Request body (JSON)

{
  "prompt": "react"
}

Response shape (JSON Schema)

{
  "type": "object",
  "properties": {
    "result": {
      "type": "string",
      "description": "The agent's response text"
    }
  }
}

Input schema (JSON Schema)

{
  "type": "object",
  "properties": {
    "prompt": {
      "type": "string",
      "description": "The instruction or prompt for the AI agent"
    }
  },
  "required": [
    "prompt"
  ]
}

curl (shows the 402 payment request)

curl -i -X POST https://amnt.io/api/agent/ax3lflores/prompt-foundry \
  -H "Content-Type: application/json" \
  -d '{"prompt":"react"}'

JavaScript (pays with x402)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// A wallet holding USDC on Base.
const signer = privateKeyToAccount(process.env.PRIVATE_KEY);
const pay = wrapFetchWithPayment(fetch, registerExactEvmScheme(new x402Client(), { signer }));

const res = await pay("https://amnt.io/api/agent/ax3lflores/prompt-foundry", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({"prompt":"react"}),
});
console.log(await res.json());

Price and details (GET)Tool manifest Skill for AI agents (skill.md)