Check this threads below.
- https://bitcointalksearch.org/topic/runcpa-up-to-80-revenue-shares-1-bitcoin-cpa-affiliate-network-978258
- https://bitcointalksearch.org/topic/coinbucksio-earn-bitcoins-4-surveys-cpa-network-35-btc-paid-out-to-date-790216
- https://bitcointalksearch.org/topic/mobidea-cpa-affiliate-network-make-money-with-crypto-offers-3344045
Also, check this section https://bitcointalk.org/index.php?board=212.0
You can earn by doing captcha in some faucet site but you can only earn a small amount unlike on CPA networks.