{"openapi":"3.1.0","info":{"title":"Wayback Machine","version":"1.0.0","x-guidance":"Every path is payable per request over HTTP 402 in USDG on eip155:4663. GET or POST without credentials to receive the challenge (WWW-Authenticate Payment header, plus the x402 payment-required header). Sign PermitWitnessTransferFrom for the advertised offer (spender is the canonical x402ExactPermit2Proxy) and retry with the payment-signature header. Buyers only need USDG: a one-time sponsored Permit2 approval is available at POST /api/gas/sponsor {\"address\"}."},"x-service-info":{"description":"Web history from the Internet Archive: check for archived snapshots of any URL and list capture history. Machine-payable per request."},"paths":{"/available":{"get":{"summary":"The closest archived snapshot of a URL. Pass ?url=example.com, add &timestamp=20200101 to target a date. Returns the archive URL if one exists.","responses":{"200":{"description":"Successful response"},"402":{"description":"Payment Required"}},"x-payment-info":{"price":{"mode":"fixed","currency":"USD","amount":"0.005000"},"protocols":[{"mpp":{"method":"evm","intent":"charge","currency":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168"}},{"x402":{}}],"amount":"5000","currency":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","description":"Wayback Machine: Closest snapshot","intent":"charge","method":"evm","recipient":"0xbB818E97E2260904B1D502E154488392ba2Ab5C9","scheme":"exact","network":"eip155:4663","extra":{"assetTransferMethod":"permit2","spender":"0x402085c248EeA27D92E8b30b2C58ed07f9E20001","name":"USDG"}}}},"/snapshots":{"get":{"summary":"List of archived captures for a URL over time. Pass ?url=example.com&output=json&limit=50&collapse=timestamp:6 for one capture per month. Can take ~10s on large sites.","responses":{"200":{"description":"Successful response"},"402":{"description":"Payment Required"}},"x-payment-info":{"price":{"mode":"fixed","currency":"USD","amount":"0.005000"},"protocols":[{"mpp":{"method":"evm","intent":"charge","currency":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168"}},{"x402":{}}],"amount":"5000","currency":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","description":"Wayback Machine: Capture history","intent":"charge","method":"evm","recipient":"0xbB818E97E2260904B1D502E154488392ba2Ab5C9","scheme":"exact","network":"eip155:4663","extra":{"assetTransferMethod":"permit2","spender":"0x402085c248EeA27D92E8b30b2C58ed07f9E20001","name":"USDG"}}}}}}