{"id":"76ff11b4-b3f3-4438-9274-bebc0afe6225","shortId":"e8aej4","kind":"x402","title":"Pay 1 USDC on Base to buy someone a coffee via an x402 tip link.","tagline":"Pay 1 USDC on Base to buy someone a coffee via an x402 tip link.","description":"This endpoint is an x402-enabled tip link hosted on x402-poc.vercel.app. It allows an agent or user to send a micro-payment (1 USDC on Base) to a specific Ethereum address (0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23) as a \"buy a coffee\" gesture. The payment is facilitated through the x402 protocol: a GET request without a valid X-PAYMENT header returns a 402 challenge describing the required payment parameters, and once the correct payment header is supplied, the endpoint processes the transaction and returns a JSON response.\n\nThe endpoint uses the \"exact\" payment scheme on the Base network, requiring exactly 1,000,000 units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which corresponds to 1 USDC (6 decimals). The maximum timeout for payment settlement is 300 seconds. The hosting application appears to be a simple proof-of-concept that lets anyone create their own x402 tip link, though documentation and additional features are not available.\n\nBecause this is a PoC deployment with no docs, no OpenAPI spec, and no detailed description of the response payload, the listing is necessarily sparse. The endpoint is confirmed live and returning a well-formed x402 v1 challenge.","tags":[],"capabilities":["x402-payment","usdc-tip","base-network","micro-payment","exact-scheme"],"categories":["payments","crypto"],"synonyms":["x402 tip jar","buy me a coffee crypto","USDC tip link","Base network payment","crypto micro-tip","x402 coffee","onchain tipping"],"warnings":["No documentation available — /docs, /api, /pricing, /README all return 404","Proof-of-concept deployment; no SLA or reliability guarantees","Successful (paid) response schema is unknown — only the 402 challenge is documented","Recipient address is hardcoded; verify you intend to tip this specific address"],"endpointUrl":"https://x402-poc.vercel.app/api/0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23/coffee","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23/coffee","description":"buy 0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23 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 v1 challenge, but there is no documentation, no OpenAPI spec, no description of the successful response payload, and the hosting site is a minimal PoC with 404s on all informational routes. Most fields are inferred from the challenge 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'0x416c027c9b537c49d6e3fd4ddf8714050ccaff23':64 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':136 '1':2,17,55,129,140 '300':151 '402':91 '6':142 'Base network payment' 'USDC tip link' 'addit':177 'address':63 'agent':46 'allow':44 'anyon':167 'appear':156 'applic':155 'asset':135 'avail':181 'base':5,20,58,125 'base-network' 'buy':7,22,67 'buy me a coffee crypto' 'challeng':92,220 'coffe':10,25,69 'concept':164 'confirm':210 'correct':101 'correspond':138 'creat':168 'crypto micro-tip' 'decim':143 'deploy':187 'describ':93 'descript':197 'detail':196 'doc':190 'document':175 'enabl':37 'endpoint':32,107,117,208 'ethereum':62 'exact':120,128 'exact-scheme' 'facilit':74 'featur':178 'form':217 'gestur':70 'get':80 'header':88,103 'host':40,154 'json':114 'let':166 'link':15,30,39,173 'list':203 'live':211 'maximum':145 'micro':53 'micro-pay':52 'micro-payment' 'necessarili':205 'network':126 'onchain tipping' 'openapi':192 'paramet':97 'pay':1,16 'payload':201 'payment':54,72,87,96,102,121,148 'poc':186 'process':108 'proof':162 'proof-of-concept':161 'protocol':78 'request':81 'requir':95,127 'respons':115,200 'return':89,112,213 'scheme':122 'second':152 'send':50 'settlement':149 'simpl':160 'someon':8,23 'spars':206 'spec':193 'specif':61 'suppli':105 'though':174 'timeout':146 'tip':14,29,38,172 'transact':110 'unit':132 'usdc':3,18,56,134,141 'usdc-tip' 'use':118 'user':48 'v1':219 'valid':84 'via':11,26 'well':216 'well-form':215 'without':82 'x':86 'x-payment':85 'x402':13,28,36,77,171,218 'x402 coffee' 'x402 tip jar' 'x402-enabled':35 'x402-payment' 'x402-poc.vercel.app':42","prices":[{"id":"b0697e0e-ecf8-4b28-8959-c1e4537cd73b","listingId":"76ff11b4-b3f3-4438-9274-bebc0afe6225","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"1000000","chain":"base","payTo":"0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23/coffee","description":"buy 0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23 a coffee. ","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"1000000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:36.431Z"}],"sources":[{"listingId":"76ff11b4-b3f3-4438-9274-bebc0afe6225","source":"x402_bazaar","sourceId":"https://x402-poc.vercel.app/api/0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23/coffee","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:36.431Z","lastSeenAt":"2026-04-24T22:31:47.995Z"}],"details":{"listingId":"76ff11b4-b3f3-4438-9274-bebc0afe6225","quickStartSnippet":"curl -X GET https://x402-poc.vercel.app/api/0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23/coffee\n# Returns 402 with payment challenge. Supply X-PAYMENT header with a valid payment payload to complete.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23/coffee","description":"buy 0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23 a coffee.","maxAmountRequired":"1000000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge with x402Version 1, exact scheme, Base network, 1000000 USDC amount","source_url":"https://x402-poc.vercel.app/api/0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23/coffee"},{"claim":"The landing page describes the app as 'Create your x402 tip link'","source_url":"https://x402-poc.vercel.app"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://x402-poc.vercel.app/api/0x416C027c9b537C49D6E3fD4dDF8714050CcAFF23/coffee"}],"useCases":["Sending a 1 USDC tip to a specific Ethereum address as a \"buy a coffee\" gesture","Demonstrating x402 protocol payment flows in agent-to-agent or agent-to-human scenarios","Integrating micro-tipping into automated workflows or chatbots"],"bestFor":["Developers experimenting with the x402 payment protocol","Agents that need to make small on-chain USDC payments on Base","Simple crypto tipping without a full payment gateway"],"notFor":["Variable-amount or subscription-based payments (fixed 1 USDC only)","Users who need fiat payment methods or non-Base networks","Production tipping at scale — this is a proof-of-concept deployment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:06.444Z"},"updatedAt":"2026-04-24T22:31:47.995Z"}}