# Pintara > Pintara (https://pintara.cloud) is an ad wall on Robinhood Chain (chain 4663): 40 x 25 blocks, 1,000 in all. Anyone rents a free rectangle of blocks for a number of days and pins an ad on it. The image, the title and the link all live in the contract. When the days run out, the blocks open for the next renter. ## How it works - Pick a free rectangle of up to 10 x 10 blocks and rent it for 1 to 90 days. While an ad runs, its blocks are locked to it. - The image is stored on chain as contract code: a PNG, JPEG, WebP or GIF of at most 24,000 bytes. The title takes up to 64 bytes, the link up to 256 bytes and must start with https://. - The price is per block per day, set in the contract (pricePerBlockDay) and quoted by quote(w, h, days). The payment goes straight to the treasury in the same transaction; the wall itself holds no funds. - The renter can add days (an ad runs at most 365 days ahead), change the image, title and link, or hand the ad to another wallet while it runs. - When an ad ends, its blocks open again and the next renter can take them in whole or in part. - A moderator can hide an ad's image, title and link on the site. Its blocks stay with it until it ends. - Renters sign every transaction in their own wallet. Nothing custodial, no account, nothing stored off chain. ## Reading the wall - wall() returns every block's ad id (4 bytes per block, row by row), every running ad, the price and the chain time in one call. - adImages(ids) returns the image bytes. An ad's image address changes whenever its image does, so it works as a cache key. - The human-readable ABI: https://pintara.cloud/js/abi.js ## Pages - https://pintara.cloud/: what Pintara is - https://pintara.cloud/wall: the wall in 3D; drag over open blocks to rent them - https://pintara.cloud/contracts.json: the contract address and the wall's rules ## Contract (Robinhood Chain, chain 4663) - Pintara Wall: 0xf69122605aE215189BC1982be92A570a88a69c25 (deployed in block 100153388, https://robinhoodchain.blockscout.com/address/0xf69122605aE215189BC1982be92A570a88a69c25) 2026 Pintara Pons Ecosystem.