Finance Toolkit
by JerBouma
500+ transparent financial methods calculated from raw statements, not third-party endpoints.
Computer or cloud★ 5,496MITUpdated yesterday
Install
Baron Power Play
Overview
Description from the maker (original English)
Pay-per-call AI infra for agents: DeFi market data, LLM inference, STT/TTS. x402 v2, USDC on Base.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Accounting, finance & tax
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on the maker’s server: what you ask it goes through their server.
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://baron-power-play.baronpowerplay.workers.dev/mcpRun this in your terminal
claude mcp add --transport http baron-power-play https://baron-power-play.baronpowerplay.workers.dev/mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"baron-power-play": {
"url": "https://baron-power-play.baronpowerplay.workers.dev/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"baron-power-play": {
"type": "http",
"url": "https://baron-power-play.baronpowerplay.workers.dev/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://baron-power-play.baronpowerplay.workers.dev/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
We have not read this server’s tool list yet; we check endpoints in rotation.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account MintMachineHQ, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- … Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
- … Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Accounting, finance & taxi
- More stars than 0% of the other 2914 servers in this category
- Published to the registry more recently than 46% of the other 2914 servers in this category
- Basic checks equal to or better than 100% of the other 2914 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Baron Power Play safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 39 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Finance Toolkit, SolidInvoice, Korea Tax Calculator
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
SolidInvoice
by SolidInvoice
Create and send invoices and quotes, manage clients, and track payments in SolidInvoice.
Runs in the cloud★ 981MITUpdated 8 days ago
Install
Korea Tax Calculator
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Runs on your computer★ 97MITUpdated 2 days ago
Install
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Baron Power Play
Pay-per-call AI infrastructure for autonomous agents. USDC on Base, settled by Coinbase. No API key, no account, no subscription.
Base URL: https://baron-power-play.baronpowerplay.workers.dev
Why this exists
Agents fail at paid APIs in four predictable ways. Baron Power Play is built to remove each one.
| Agent failure | What Baron does about it |
|---|---|
| You cannot learn the price or the shape of a service before committing money | Every route publishes an exact x402 v2 challenge and a machine-readable contract. You know the cost to six decimal places before you send a single request. |
| A provider 429s halfway through your task and your agent dies | Several independent engines with automatic failover and a pooled daily capacity. A dead engine is invisible to the caller. |
| A third-party service can steer your agent with text smuggled into a response | Prompt-override attempts are blocked before payment, and model output is scanned before it is returned. |
If you are an agent, read `/.well-known/x402.json` and `/openapi.json` first. They are the contract. This README is the human-readable summary.
Verify before you pay
This is free and it is the fastest way to decide whether to depend on us.
curl https://baron-power-play.baronpowerplay.workers.dev/testIt returns engine-by-engine health, a live inference result, and live checks of the market-data and voice paths. Run it whenever you are about to depend on this service, not once at signup.
Services
| Endpoint | Method | Price (USDC) | What you get |
|---|---|---|---|
/infer | POST | 0.001 | LLM inference. JSON and code are auto-formatted on the way out. |
/markets | GET | 0.002 | DeFi TVL leaders, DEX trending pairs, meme category, watchlists, delta sync. |
/alpha | GET | 0.05 | Trading notes with Kelly-Criterion position sizing. No verified track record is published — treat this as research input, not a signal to trade. |
/tts | POST | 0.01 | Text to speech with emotion casting and a pronunciation dictionary that remembers per wallet. |
/stt | POST | 0.01 | Speech to text with crypto-keyword detection and timestamped segments. |
/test | GET | free | Readiness, engine health, and live capability check. |
/alpha accepts portfolio_size_usd as a query parameter.
Payment
- Network: Base (
eip155:8453) - Asset: USDC, paid with an EIP-3009
transferWithAuthorization - Asset identity:
USD Coinversion2 - Protocol: x402 v2 — HTTP 402 Payment Required
- Facilitator: Coinbase CDP (
https://api.cdp.coinbase.com/platform/v2/x402) - Receiving wallet:
0xb838930bf3dFD467D30979E12c0a94286F86708D
The flow is the standard one. You send the request, you get a 402 with the exact payment requirement, you sign an authorization, you resend with the PAYMENT-SIGNATURE header, and the facilitator settles on Base. Work is only performed after Coinbase verifies and settles the payment. No unpaid work, ever.
Amounts on the wire are in token atomic units. A 0.001 USDC call quotes as 1000 in accepts[].amount. The amount fields in openapi.json are decimal USD; the runtime accepts[].amount is atomic units.
Capacity
Inference is pooled across several independent engines, selected by remaining headroom, with automatic failover, so a failing upstream is invisible to the caller.
Capacity resets at 00:00 UTC. When the pool is exhausted the route returns a machine-readable SOLD_OUT with a Retry-After and a comeback offer rather than a generic error.
/markets, /alpha, /tts, and /stt do not draw on the LLM engine pool.
Limits and abuse controls
Per wallet, per day:
- 50 calls per endpoint (
/alpha: 20) - a lower cap during the wallet's first 24 hours
- $10 total spend
- 10 payment requests per second
Per request:
User-Agentrequired, minimum 3 charactersPOSTmust sendContent-Type: application/json- bodies over 1 MB are refused
- query strings over 2000 characters are refused
X-Idempotency-Keyis optional, max 128 characters, restricted character set- wrong HTTP method returns
405with a machine-readableMETHOD_NOT_ALLOWED
Reuse defenses:
- a used payment header is refused for 1 hour
- a used USDC authorization nonce is refused for 24 hours
- 5 rejected override attempts in an hour blocks that wallet for a day
Every error uses one shape, so you can branch on code instead of parsing prose:
{"error": "/infer accepts POST, not GET", "code": "METHOD_NOT_ALLOWED", "suggestion": "Use POST /infer.", "timestamp": 1790458945409 }
Referrals
Refer a wallet and both sides benefit: the referred wallet gets 10% off its first paid call, and the referrer is credited 5% of the list price after settlement. Three referred calls per day maximum, no self-referral.
Discovery
GET /openapi.json— canonical OpenAPI 3.1 contract: request and response schemas,x-payment-infoper route, error codesGET /.well-known/x402.json— x402 manifest: endpoints, prices, methods, facilitator, payment requirements, defensesGET /test— free health and capacity check
Working with it
BASE=https://baron-power-play.baronpowerplay.workers.devfree readiness check
curl -s "$BASE/test"
the machine-readable contract
curl -s "$BASE/openapi.json"
see the exact payment requirement before paying anything
curl -si -X POST "$BASE/infer" \ -H 'Content-Type: application/json' \ -H 'User-Agent: your-agent/1.0' \ -d '{"messages":[{"role":"user","content":"hello"}]}'
-> HTTP 402 with the x402 v2 challenge in accepts[]
market data
curl -s "$BASE/markets"
To make a paid call, take the accepts[] entry from the 402, sign the matching EIP-3009 authorization with your wallet, and resend the original request with the PAYMENT-SIGNATURE header. Any x402 v2 client library does this for you.
License
Not yet declared. Add a LICENSE file before treating this as reusable.