iStockphoto is an online, royalty free, international microstock photography provier operating with the micropayment business model. Images cost between 1 and 20 credits, depending on size (with credits ranging from $.96 to $1.30 each). General consensus attributes the pioneering of the microstock photography industry to iStockphoto, which claims to be "the world's fastest growing collection of original, independent, royalty-free images."