The API launchpad for Robinhood Chain

Turn any endpoint
into a paid product.

Paste your API URL, set a price per request, and launch. We handle payments and settlement.

Launch your API
weather-ai / request
A paid call, start to finish.
HTTP 402 ✓
POST /x402/weather-ai
content-type: application/json
{ "city": "Bengaluru" }
Payment settled · 0.002 USDG 200 OK
What you get
Direct wallet payouts Zero platform fee Built-in analytics Agent-ready access
About

We built infrastructure for direct, onchain digital-content payments. A creator sets the content and the price, a buyer pays from their own wallet, the money goes straight to the creator, and the application only releases the content once it has verified the transfer on chain.

Built on
Features

A paid endpoint.
Without building billing.

Bring the API you already run. Everything between the request and the payout is handled for you.

Your endpointhttps://api.yoursite.com/generate
Public gateway/x402/weather-ai
The private URL is never published.
Paste once · we proxy every paid call

Your endpoint stays private.

We publish a protected gateway in its place. Buyers and agents call the gateway; only a verified payment reaches your real API.

Unpaid call402 Payment Required — 0.002 USDG to 0x71c8…2E1a on chain 4663
After payment200 OK — your API answers
and the creator is paid.
Exact amountRight recipientConfirmed

Every payment is checked on chain.

The server re-reads the transaction receipt and matches the chain, recipient, token and exact amount before anything is delivered.

Payment receiptOne proof unlocks one purchase.
Reusable for the same resource.
Useless for any other.
PAYMENT-RESPONSE···
✓ Receipt stored before delivery

An interrupted download is not a lost payment.

The receipt is written before your content is served, so the same proof recovers the same purchase — and can never buy a different one.

Use cases

One payment rail.
Several ways to earn.

Meter an API, lock a file, or let an autonomous agent pay its own way.

Paid APIs

Charge per request.
Not per month.

Set a price as small as a fraction of a cent. Callers pay for exactly what they use, with no subscription and no API-key checkout.

GETPOSTPUTPATCHDELETE
Launch detailsSigned
WeatherAI AI-ready weather data for apps and autonomous agents.
$0.002 per request · paid in USDG · direct to your wallet
Chain ID 46630% fee
Digital files

Sell a file
without a storefront.

Upload a report, a dataset, code, or private notes. The file is encrypted at rest and released only after the payment clears.

PDFZIPCSVCodeText
Encrypted vaultAES-256-GCM
1GET /api/paywalls/:id/download
2402 Payment Required
3GET … PAYMENT-SIGNATURE: <proof>
4200 OK — file decrypted
Content is never stored in the clear. The link is all you need to share.
AI agents

Machines that pay
for what they use.

An autonomous agent reads the 402 challenge, sends the transfer, and retries with the proof. No account, no key, no human in the loop.

Discovery feed402 challengeProof header
Agent handshakex402 v2
GET /discovery/resources
Everything an agent needs, in one response.
  1. 01 Read the price, token and recipient.
  2. 02 Send the exact transfer on chain.
  3. 03 Retry with PAYMENT-SIGNATURE.
No API key is ever issued or leaked.
Creator analytics

See what earns.
Change it in a click.

Paid requests, revenue and status for every listing. Pause, resume, reprice or delete — each action signed by your wallet.

RequestsRevenueStatus
My projectsLive
Everything you launched, in one place.
  • API
    Metered endpointsRequests · revenue · status
  • FILE
    Protected downloadsViews · sales · revenue
  • SIGN
    Wallet-signed managementPause · resume · delete
Benefits

Keep the revenue.
Skip the middleman.

No custody, no payout schedule, no platform cut between you and the buyer.

Direct wallet payouts

Buyers transfer straight to the address you configured. We never hold your funds.

Zero platform fee

The facilitator fee is 0%. You pay network gas, and nothing to us.

Built-in analytics

Paid requests, revenue and status are tracked per listing and shown publicly.

Protected by design

Signed listings, encrypted storage, exact-amount checks and replay control.

How it works

No billing stack.
Just three steps.

From an endpoint you already run to a paid product, in a few minutes.

https://api.yoursite.com/generate
Paste
01

Paste your endpoint

Give us the URL you already serve. We keep it private and publish a protected gateway in front of it.

Access & pricing Allowed methods · GET, POST Price per request · $0.002 Payout · your wallet, chain 4663
02

Set the price and sign

Choose the methods and the amount, then sign with your wallet. Signing proves ownership; it does not move funds.

✓ Listed in the public marketplace ✓ Discoverable by autonomous agents ✓ Paid per call, straight to your wallet Pause, reprice or delete at any time
03

Start earning per call

Your API appears in the marketplace and the discovery feed. Every verified payment settles directly to you.

Under the hood

An open standard,
not a black box.

A payment proof is a transaction hash. Anyone can check it on the public explorer.

01
The client calls the resource with no proof and receives HTTP 402 carrying the exact network, token, amount and recipient.
Payment requiredStandard challenge
02
The buyer's wallet sends that exact transfer on chain. Nothing is escrowed — the funds go straight to the creator's address.
Direct transferNo custody
03
The proof — scheme, transaction hash and payer — is base64-encoded into the PAYMENT-SIGNATURE header and the call is retried.
Payment proofOne header
04
The server re-reads the receipt on chain, checks every field of the requirement, stores a durable receipt and only then delivers.
Verified deliveryReplay protected
Read the payment flow
Pricing

Zero platform fee.
However you use it.

We do not take a cut and we never hold your money. You pay network gas, like any on-chain transfer.

LAUNCH AN API
0%platform fee

Meter an endpoint you already run and get paid per request.

Launch your API Included
  • Protected public gateway
  • Your endpoint stays private
  • Per-request pricing
  • Marketplace listing
  • Requests and revenue analytics
SELL A FILEPopular
0%platform fee

Put a paywall on a document, a dataset or private text.

Create a paywall Included
  • AES-256-GCM encrypted vault
  • Shareable checkout link
  • Release only after verification
  • Views, sales and revenue
  • Interrupted-download recovery
BUILD AN AGENT
Open

Consume paid resources programmatically, with no account to create.

Read the docs Included
  • Public discovery feed
  • x402-shaped 402 challenge
  • Facilitator verify and settle
  • Durable settlement receipts
  • No API keys to manage
FAQ

A few things
you might wonder.

What network does the application use?

It is configured for Robinhood Chain (chain ID 4663) and Robinhood Chain Testnet (46630). A deployment serves one network at a time, and testnet records are kept in a separate store.

Which currencies can buyers use?

Native ETH is supported by default. ERC-20 currencies — Global Dollar (USDG) on mainnet — are available only when the operator has configured a verified contract address for that exact network.

Do you hold buyer funds?

No. The buyer transfers directly to the creator address named in the payment requirement. The application verifies the transaction and reports a facilitator fee of zero.

Can a blockchain payment be reversed?

Usually not. Check every wallet confirmation carefully — network, recipient, token and amount — and contact the creator directly about any refund request.

Is this a certified x402 facilitator?

No certification or drop-in compatibility is claimed. The application uses a custom HTTP 402 challenge and payment-proof format inspired by x402, and the docs say so explicitly.

What happens if my download is interrupted?

The settlement receipt is stored before the content is served. Reopening the link and presenting the same proof recovers the same purchase — and that proof can never unlock a different resource.

Has the application been audited?

No independent audit has been published. The safeguards in place are listed in the security section of the docs, along with the known operational limits. Do not assume an independent review has taken place.

What will you charge for?

Bring an endpoint, a dataset or a document. Put a price on it and let the payment rail do the rest.