{"id":"da9cf1ef-dc23-485f-bd61-c08649b17b5a","shortId":"bYg7q6","kind":"x402","title":"Send a USDC tip (\"buy a coffee\") via x402 payment on Base network.","tagline":"Send a USDC tip (\"buy a coffee\") via x402 payment on Base network.","description":"This x402 endpoint implements a simple tipping mechanism — \"buy someone a coffee\" — using the x402 payment protocol on the Base network. When an unauthenticated GET request is made, the endpoint returns a 402 Payment Required challenge specifying that 1 USDC (1,000,000 units in 6-decimal USDC) must be sent to the wallet address 0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0 via the \"exact\" payment scheme. The accepted asset is USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nThe hosting application at x402-poc.vercel.app is a proof-of-concept that lets users create their own x402 tip links. The landing page shows a simple \"Create your x402 tip link\" interface. There is no additional documentation, pricing page, or OpenAPI spec available — the 402 challenge itself is the primary specification for interacting with this endpoint.\n\nTo complete a payment, a caller must include an X-PAYMENT header conforming to x402 version 1 with the exact amount. The payment timeout is 300 seconds. Upon successful payment, the endpoint returns an application/json response. Because this is a proof-of-concept, there is no information about rate limits, SLAs, or the structure of the success response beyond the MIME type.","tags":[],"capabilities":["x402-payment","usdc-tipping","base-network","exact-payment-scheme","crypto-micropayment"],"categories":["payments","crypto"],"synonyms":["buy a coffee","crypto tip","USDC tip","x402 tip link","Base USDC payment","micropayment","donation link","tip jar"],"warnings":["Proof-of-concept deployment — no SLA, documentation, or guarantees","No docs, OpenAPI spec, or pricing page available (all return 404)","Success response schema is unknown; only MIME type application/json is specified","Wallet address in URL is user-specific — this is one instance of a generic tip-link generator"],"endpointUrl":"https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee","description":"buy 0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0 a coffee. ","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"1000000","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live and returns a well-formed x402 challenge with clear payment parameters. However, this is a proof-of-concept with no documentation, no OpenAPI spec, no success response examples, and no information about what is returned after payment. The description and title are minimal and 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'0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':94 '0xb81f6a3de77c5192aa08ed3f0376159e72412bf0':82 '1':65,67,170 '300':179 '402':59,141 '6':72 'Base USDC payment' 'USDC tip' 'accept':89 'addit':132 'address':81 'amount':174 'applic':99 'application/json':188 'asset':90 'avail':139 'base':12,25,46,96 'base-network' 'beyond':213 'buy':5,18,35 'buy a coffee' 'caller':158 'challeng':62,142 'coffe':7,20,38 'complet':154 'concept':107,197 'conform':166 'contract':93 'creat':111,123 'crypto tip' 'crypto-micropayment' 'decim':73 'document':133 'donation link' 'endpoint':29,56,152,185 'exact':85,173 'exact-payment-scheme' 'get':51 'header':165 'host':98 'implement':30 'includ':160 'inform':201 'interact':149 'interfac':128 'land':118 'let':109 'limit':204 'link':116,127 'made':54 'mechan':34 'micropayment' 'mime':215 'must':75,159 'network':13,26,47 'openapi':137 'page':119,135 'payment':10,23,42,60,86,156,164,176,183 'price':134 'primari':146 'proof':105,195 'proof-of-concept':104,194 'protocol':43 'rate':203 'request':52 'requir':61 'respons':189,212 'return':57,186 'scheme':87 'second':180 'send':1,14 'sent':77 'show':120 'simpl':32,122 'slas':205 'someon':36 'spec':138 'specif':147 'specifi':63 'structur':208 'success':182,211 'timeout':177 'tip':4,17,33,115,126 'tip jar' 'type':216 'unauthent':50 'unit':70 'upon':181 'usdc':3,16,66,74,92 'usdc-tipping' 'use':39 'user':110 'version':169 'via':8,21,83 'wallet':80 'x':163 'x-payment':162 'x402':9,22,28,41,114,125,168 'x402 tip link' 'x402-payment' 'x402-poc.vercel.app':101","prices":[{"id":"0e4b18f2-ccb6-41ed-bb5a-0c515b5376af","listingId":"da9cf1ef-dc23-485f-bd61-c08649b17b5a","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"1000000","chain":"base","payTo":"0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee","description":"buy 0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0 a coffee. ","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"1000000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:40.594Z"}],"sources":[{"listingId":"da9cf1ef-dc23-485f-bd61-c08649b17b5a","source":"x402_bazaar","sourceId":"https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:40.594Z","lastSeenAt":"2026-04-24T22:31:48.039Z"}],"details":{"listingId":"da9cf1ef-dc23-485f-bd61-c08649b17b5a","quickStartSnippet":"curl -i https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee\n# Returns 402 with x402 challenge. Include X-PAYMENT header with valid payment to complete.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee","description":"buy 0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0 a coffee.","maxAmountRequired":"1000000","maxTimeoutSeconds":300}],"x402Version":1},"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 on Base network","source_url":"https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee"},{"claim":"The accepted asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USD Coin)","source_url":"https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee"},{"claim":"The landing page offers a 'Create your x402 tip link' interface","source_url":"https://x402-poc.vercel.app"},{"claim":"Payment timeout is 300 seconds and uses x402 version 1 exact scheme","source_url":"https://x402-poc.vercel.app/api/0xb81F6a3dE77c5192aA08Ed3F0376159e72412bF0/coffee"}],"useCases":["Sending a USDC tip to a specific wallet address via an HTTP request","Demonstrating x402 protocol payment flows in agent or app integrations","Creating a pay-per-access gate for content or services using x402"],"bestFor":["Developers experimenting with the x402 payment protocol","Agents that need to make small USDC payments programmatically","Users who want a simple crypto tipping endpoint on Base"],"notFor":["Production payment processing requiring SLAs and guarantees","Non-crypto or fiat-based tipping workflows","High-value transactions (this is a 1 USDC PoC tip)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:05.696Z"},"updatedAt":"2026-04-24T22:31:48.039Z"}}