{"id":"30bb7a40-77f7-4175-b2f8-eace09bc4043","shortId":"f3mVHs","kind":"x402","title":"Send a 1 USDC tip (coffee) to an Ethereum address via x402 on Base.","tagline":"Send a 1 USDC tip (coffee) to an Ethereum address via x402 on Base.","description":"This x402 endpoint lets anyone send a micro-tip — framed as \"buying a coffee\" — to the Ethereum address 0x80ACb85a6a7bE84036575960A52598f954416959. It is hosted on the x402-poc.vercel.app proof-of-concept platform, which provides a simple interface for creating x402-based tip links.\n\nThe endpoint accepts a GET request with an X-PAYMENT header containing a valid x402 payment proof. The payment scheme is \"exact\" on the Base network, requiring up to 1,000,000 units (1 USDC, given 6 decimals) paid in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The response MIME type is application/json. The x402 challenge version is 1, and the maximum timeout for payment settlement is 300 seconds.\n\nThis is a minimal proof-of-concept tipping endpoint. There is no OpenAPI spec, no dedicated documentation, and no additional features beyond the single payment-gated GET route. The landing page at the origin simply offers a form to create new tip links. It is best suited for demonstrating x402 payment flows or for agents that need to programmatically send small USDC tips on Base.","tags":[],"capabilities":["x402-payment","usdc-tipping","base-network","micro-payment","payment-gated-get"],"categories":["payments","crypto"],"synonyms":["x402 tip","buy a coffee crypto","USDC tip link","Base network payment","micro-tipping","x402 proof of concept","crypto coffee","402 payment required"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return 404.","No OpenAPI or schema beyond the x402 challenge outputSchema stub.","This appears to be a proof-of-concept deployment; reliability and longevity are unknown.","No example response body is available; the actual JSON returned after payment is undocumented."],"endpointUrl":"https://x402-poc.vercel.app/api/0x80ACb85a6a7bE84036575960A52598f954416959/coffee","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x80ACb85a6a7bE84036575960A52598f954416959","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0x80ACb85a6a7bE84036575960A52598f954416959/coffee","description":"buy 0x80ACb85a6a7bE84036575960A52598f954416959 a coffee. ","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"1000000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a well-formed x402 challenge with clear payment parameters. However, there is no OpenAPI spec, no documentation, no example responses, and the crawl yields only a minimal landing page. Most fields are inferred from the challenge payload 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'0x80acb85a6a7be84036575960a52598f954416959':48 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '1':3,17,102,106,127 '300':136 '402 payment required' '6':109 'Base network payment' 'USDC tip link' 'accept':74 'addit':158 'address':10,24,47 'agent':194 'anyon':33 'application/json':121 'base':14,28,69,97,204 'base-network' 'best':185 'beyond':160 'buy':41 'buy a coffee crypto' 'challeng':124 'coffe':6,20,43 'concept':58,145 'contain':84 'contract':114 'creat':66,179 'crypto coffee' 'decim':110 'dedic':154 'demonstr':188 'document':155 'endpoint':31,73,147 'ethereum':9,23,46 'exact':94 'featur':159 'flow':191 'form':177 'frame':39 'gate':165 'get':76,166 'given':108 'header':83 'host':51 'interfac':64 'land':169 'let':32 'link':71,182 'maximum':130 'micro':37 'micro-payment' 'micro-tip':36 'micro-tipping' 'mime':118 'minim':141 'need':196 'network':98 'new':180 'offer':175 'openapi':151 'origin':173 'page':170 'paid':111 'payment':82,88,91,133,164,190 'payment-g':163 'payment-gated-get' 'platform':59 'programmat':198 'proof':56,89,143 'proof-of-concept':55,142 'provid':61 'request':77 'requir':99 'respons':117 'rout':167 'scheme':92 'second':137 'send':1,15,34,199 'settlement':134 'simpl':63 'simpli':174 'singl':162 'small':200 'spec':152 'suit':186 'timeout':131 'tip':5,19,38,70,146,181,202 'type':119 'unit':105 'usdc':4,18,107,113,201 'usdc-tipping' 'valid':86 'version':125 'via':11,25 'x':81 'x-payment':80 'x402':12,26,30,68,87,123,189 'x402 proof of concept' 'x402 tip' 'x402-based':67 'x402-payment' 'x402-poc.vercel.app':54","prices":[{"id":"c9f3beb0-d53c-46cf-909d-c291e3d6a3e6","listingId":"30bb7a40-77f7-4175-b2f8-eace09bc4043","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"1000000","chain":"base","payTo":"0x80ACb85a6a7bE84036575960A52598f954416959","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x80ACb85a6a7bE84036575960A52598f954416959","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0x80ACb85a6a7bE84036575960A52598f954416959/coffee","description":"buy 0x80ACb85a6a7bE84036575960A52598f954416959 a coffee. ","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"1000000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:38.189Z"}],"sources":[{"listingId":"30bb7a40-77f7-4175-b2f8-eace09bc4043","source":"x402_bazaar","sourceId":"https://x402-poc.vercel.app/api/0x80ACb85a6a7bE84036575960A52598f954416959/coffee","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:38.189Z","lastSeenAt":"2026-04-24T22:31:47.995Z"}],"details":{"listingId":"30bb7a40-77f7-4175-b2f8-eace09bc4043","quickStartSnippet":"curl -X GET \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  https://x402-poc.vercel.app/api/0x80ACb85a6a7bE84036575960A52598f954416959/coffee","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, scheme 'exact', network 'base', maxAmountRequired 1000000, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC), and payTo 0x80ACb85a6a7bE84036575960A52598f954416959.","source_url":"https://x402-poc.vercel.app/api/0x80ACb85a6a7bE84036575960A52598f954416959/coffee"},{"claim":"The landing page at x402-poc.vercel.app offers a 'Create your x402 tip link' interface.","source_url":"https://x402-poc.vercel.app"},{"claim":"The /docs, /pricing, /api, and /README paths all return 404.","source_url":"https://x402-poc.vercel.app/docs"}],"useCases":["Programmatically tipping a specific Ethereum address 1 USDC on Base","Demonstrating x402 payment protocol flows in agent or app integrations","Sending a small crypto gratuity without a traditional payment UI"],"bestFor":["Developers experimenting with the x402 payment protocol","AI agents that need to execute micro-payments on Base","Quick USDC tipping to a known wallet address"],"notFor":["Variable-amount or subscription payments (fixed 1 USDC only)","Users who need fiat payment options or non-USDC tokens","Production tipping at scale — this is a proof-of-concept deployment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:06.422Z"},"updatedAt":"2026-04-24T22:31:47.995Z"}}