Museum Collections

Open-access art from the Metropolitan Museum of Art and the Art Institute of Chicago: search half a million works and fetch full records with CC0 images. Machine-payable per request.

Robinhood Chain

Offers

Offer	Endpoint	Price
Art Institute search Search the Art Institute of Chicago collection. Pass ?q=monet&limit=5&fields=id,title,artist_display,date_display,image_id; build image URLs from image_id via their IIIF endpoint.	`/m/art/artic-search`	0.005 USDG
Met object Full record for one Met work: title, artist, date, medium, and open-access image URLs. Append the objectID to the path, e.g. met-object/436535.	`/m/art/met-object`	0.005 USDG
Met search Search the Met collection. Pass ?q=sunflowers&hasImages=true, optionally &departmentId= or &isHighlight=true. Returns matching objectIDs for the object endpoint.	`/m/art/met-search`	0.005 USDG

Machine-readable: openapi.json with x-payment-info offers.

Try it live

Run the full MPP flow from your browser: catch the 402, sign the payment with your wallet, and watch it settle on-chain.

Pay with an agent

Any MPP or x402-compatible client works. With mppx, payment is automatic:

// x402 exact scheme (permit2) on Robinhood Chain
// 1. GET the endpoint, read the payment-required header (base64 JSON)
// 2. Sign PermitWitnessTransferFrom against Permit2 for the advertised offer
//    (spender = x402ExactPermit2Proxy, witness.to = merchant wallet)
// 3. Retry with the payment-signature header; settlement tx arrives
//    in the payment-response header
const res = await fetch('https://api.meshgateway.co/m/art/artic-search', {
  headers: { 'payment-signature': signedPaymentPayload },
})

Or inspect the challenge yourself:

curl -i https://api.meshgateway.co/m/art/artic-search
# HTTP/1.1 402 Payment Required
# WWW-Authenticate: Payment id="…", method="evm", intent="charge", …