{"id":"059baf98-94b4-4197-a9f6-1c2d0efa3c7b","shortId":"q3LgAh","kind":"x402","title":"Send a 1 USDC tip to an Ethereum address via x402 payment on Base network.","tagline":"Send a 1 USDC tip to an Ethereum address via x402 payment on Base network.","description":"This x402-enabled endpoint lets callers send a micro-tip (\"buy a coffee\") to the Ethereum address 0x6A35671c32F0055688D9f29Fa7557CD887922e72. It uses the x402 protocol's exact payment scheme on the Base network, accepting USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) as the payment asset. The required payment amount is 1 USDC (1,000,000 in 6-decimal units).\n\nThe endpoint is accessed via HTTP GET with an X-PAYMENT header containing a valid x402 payment proof. Upon successful payment verification, it returns an application/json response. The payment timeout is 300 seconds. The hosting application (x402-poc.vercel.app) is a proof-of-concept platform that allows users to create x402 tip links, each tied to a specific recipient wallet address.\n\nThis is a minimal demonstration endpoint with no additional documentation, OpenAPI spec, or detailed usage guides available. It serves as a straightforward example of the x402 payment protocol applied to a tipping use case.","tags":[],"capabilities":["x402-payment","usdc-tipping","base-network","exact-payment-scheme","micro-payment","evm-address-tipping"],"categories":["payments","crypto"],"synonyms":["x402 tip","crypto tip jar","buy me a coffee crypto","USDC tip","Base network payment","x402 micropayment","onchain tipping"],"warnings":["No documentation or OpenAPI spec available — all details inferred from the 402 challenge","This is a proof-of-concept deployment (x402-poc); reliability and longevity are uncertain","No example response body is available; the actual payload returned after payment is unknown","Fixed to a single recipient address — not a general-purpose tipping API"],"endpointUrl":"https://x402-poc.vercel.app/api/0x6A35671c32F0055688D9f29Fa7557CD887922e72/coffee","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6A35671c32F0055688D9f29Fa7557CD887922e72","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0x6A35671c32F0055688D9f29Fa7557CD887922e72/coffee","description":"buy 0x6A35671c32F0055688D9f29Fa7557CD887922e72 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 402 challenge with clear payment parameters. However, there is no documentation, no OpenAPI spec, no example responses, and the hosting site is a minimal proof-of-concept with no additional pages. Most details are inferred solely from the x402 challenge 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'0x6a35671c32f0055688d9f29fa7557cd887922e72':50 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '1':3,18,77,79 '300':118 '6':83 'Base network payment' 'USDC tip' 'accept':64 'access':89 'addit':155 'address':9,24,49,146 'allow':132 'amount':75 'appli':175 'applic':122 'application/json':112 'asset':71 'avail':163 'base':14,29,62 'base-network' 'buy':43 'buy me a coffee crypto' 'caller':37 'case':180 'coffe':45 'concept':129 'contain':99 'contract':66 'creat':135 'crypto tip jar' 'decim':84 'demonstr':151 'detail':160 'document':156 'enabl':34 'endpoint':35,87,152 'ethereum':8,23,48 'evm-address-tipping' 'exact':57 'exact-payment-scheme' 'exampl':169 'get':92 'guid':162 'header':98 'host':121 'http':91 'let':36 'link':138 'micro':41 'micro-payment' 'micro-tip':40 'minim':150 'network':15,30,63 'onchain tipping' 'openapi':157 'payment':12,27,58,70,74,97,103,107,115,173 'platform':130 'proof':104,127 'proof-of-concept':126 'protocol':55,174 'recipi':144 'requir':73 'respons':113 'return':110 'scheme':59 'second':119 'send':1,16,38 'serv':165 'spec':158 'specif':143 'straightforward':168 'success':106 'tie':140 'timeout':116 'tip':5,20,42,137,178 'unit':85 'upon':105 'usag':161 'usdc':4,19,65,78 'usdc-tipping' 'use':52,179 'user':133 'valid':101 'verif':108 'via':10,25,90 'wallet':145 'x':96 'x-payment':95 'x402':11,26,33,54,102,136,172 'x402 micropayment' 'x402 tip' 'x402-enabled':32 'x402-payment' 'x402-poc.vercel.app':123","prices":[{"id":"8db3e7dc-1fa1-4106-bb5e-fc150eb3cddd","listingId":"059baf98-94b4-4197-a9f6-1c2d0efa3c7b","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"1000000","chain":"base","payTo":"0x6A35671c32F0055688D9f29Fa7557CD887922e72","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6A35671c32F0055688D9f29Fa7557CD887922e72","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0x6A35671c32F0055688D9f29Fa7557CD887922e72/coffee","description":"buy 0x6A35671c32F0055688D9f29Fa7557CD887922e72 a coffee. ","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"1000000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:43.125Z"}],"sources":[{"listingId":"059baf98-94b4-4197-a9f6-1c2d0efa3c7b","source":"x402_bazaar","sourceId":"https://x402-poc.vercel.app/api/0x6A35671c32F0055688D9f29Fa7557CD887922e72/coffee","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:43.125Z","lastSeenAt":"2026-04-24T21:31:26.831Z"}],"details":{"listingId":"059baf98-94b4-4197-a9f6-1c2d0efa3c7b","quickStartSnippet":"curl -X GET \\\n  -H \"X-PAYMENT: <your-x402-payment-proof>\" \\\n  https://x402-poc.vercel.app/api/0x6A35671c32F0055688D9f29Fa7557CD887922e72/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 requiring 1,000,000 units of USDC (1 USDC) on Base network via the exact payment scheme","source_url":"https://x402-poc.vercel.app/api/0x6A35671c32F0055688D9f29Fa7557CD887922e72/coffee"},{"claim":"The USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://x402-poc.vercel.app/api/0x6A35671c32F0055688D9f29Fa7557CD887922e72/coffee"},{"claim":"The hosting site allows users to create x402 tip links","source_url":"https://x402-poc.vercel.app"},{"claim":"Payment timeout is 300 seconds and response MIME type is application/json","source_url":"https://x402-poc.vercel.app/api/0x6A35671c32F0055688D9f29Fa7557CD887922e72/coffee"}],"useCases":["Sending a 1 USDC tip to a specific Ethereum address as a 'buy a coffee' gesture","Demonstrating x402 protocol payment flow for agent-to-human tipping","Integrating programmatic USDC micro-tips into automated workflows"],"bestFor":["Developers experimenting with the x402 payment protocol","Agents that need to send small USDC tips on Base","Proof-of-concept x402 payment integrations"],"notFor":["Variable-amount or large-value payments (fixed at 1 USDC)","Non-USDC or non-Base-network payment scenarios","Production tipping systems requiring receipts, refunds, or dispute resolution"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:04.548Z"},"updatedAt":"2026-04-24T21:31:26.831Z"}}