{"id":"861e207e-2459-4ae5-b0ee-62ff3c5a5f77","shortId":"MNBDJA","kind":"x402","title":"Static x402 test endpoint returning a text message for a $0.001 USDC micropayment on Base.","tagline":"Static x402 test endpoint returning a text message for a $0.001 USDC micropayment on Base.","description":"This is a simple x402-gated endpoint hosted on Cloudflare Workers that returns a static text response upon receiving a valid micropayment. It is part of a small API by artlu that also gates blog post content behind x402 payments. The `/paid` endpoint specifically serves as a static testing endpoint, useful for verifying x402 payment flows and agent integration without significant cost.\n\nThe endpoint accepts POST requests and requires an `X-PAYMENT` header conforming to the x402 protocol (version 1, \"exact\" scheme). Payment is made in USDC on the Base network, with a maximum amount of $0.001 (1000 units in the asset's smallest denomination). On successful payment, the endpoint returns a `text/plain` response containing a message string. The output schema indicates the message value is redacted in the challenge (shown as \"****\"), consistent with it being gated content.\n\nThe source code is open-source under the MIT license and available on GitHub. There is no OpenAPI spec, no dedicated docs page, and no additional endpoints beyond the home page, a health check, this static test endpoint, and one gated blog post endpoint. This is a minimal, developer-oriented testing tool rather than a production content service.","tags":[],"capabilities":["x402-payment-gating","micropayment","static-response","usdc-base","cloudflare-workers","text-plain-output"],"categories":["payments","testing"],"synonyms":["x402 test endpoint","micropayment test","USDC gated content","402 payment required","x402 static test","pay-per-request API","Base network payment"],"warnings":["No OpenAPI or dedicated documentation available; /docs returns 404.","This is a static test endpoint returning a fixed message — not a production content API.","Output schema example value is redacted (\"****\"); actual response content is unknown without payment."],"endpointUrl":"https://x402.artlu.workers.dev/paid","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x094f1608960A3cb06346cFd55B10b3cEc4f72c78","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402.artlu.workers.dev/paid","description":"Static testing","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true},"output":{"type":"text/plain","properties":{"message":{"type":"string","example":"****"}}}},"maxAmountRequired":"1000","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live and returns a valid 402 challenge with an outputSchema, but documentation is minimal (no OpenAPI spec, no docs page, no usage examples). The endpoint is explicitly described as a static testing tool, and the response content is 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'0.001':11,26,129 '1':112 '1000':130 '402 payment required' 'Base network payment' 'USDC gated content' 'accept':96 'addit':197 'agent':89 'also':64 'amount':127 'api':60 'artlu':62 'asset':134 'avail':183 'base':15,30,122 'behind':69 'beyond':199 'blog':66,213 'challeng':162 'check':205 'cloudflar':41 'cloudflare-workers' 'code':173 'conform':106 'consist':165 'contain':147 'content':68,170,229 'cost':93 'dedic':192 'denomin':137 'develop':221 'developer-ori':220 'doc':193 'endpoint':4,19,38,74,81,95,142,198,209,215 'exact':113 'flow':87 'gate':37,65,169,212 'github':185 'header':105 'health':204 'home':201 'host':39 'indic':154 'integr':90 'licens':181 'made':117 'maximum':126 'messag':8,23,149,156 'micropay':13,28,53 'micropayment' 'micropayment test' 'minim':219 'mit':180 'network':123 'one':211 'open':176 'open-sourc':175 'openapi':189 'orient':222 'output':152 'page':194,202 'part':56 'pay-per-request API' 'payment':71,86,104,115,140 'post':67,97,214 'product':228 'protocol':110 'rather':225 'receiv':50 'redact':159 'request':98 'requir':100 'respons':48,146 'return':5,20,44,143 'schema':153 'scheme':114 'serv':76 'servic':230 'shown':163 'signific':92 'simpl':34 'small':59 'smallest':136 'sourc':172,177 'spec':190 'specif':75 'static':1,16,46,79,207 'static-response' 'string':150 'success':139 'test':3,18,80,208,223 'text':7,22,47 'text-plain-output' 'text/plain':145 'tool':224 'unit':131 'upon':49 'usdc':12,27,119 'usdc-base' 'use':82 'valid':52 'valu':157 'verifi':84 'version':111 'without':91 'worker':42 'x':103 'x-payment':102 'x402':2,17,36,70,85,109 'x402 static test' 'x402 test endpoint' 'x402-gated':35 'x402-payment-gating'","prices":[{"id":"e580e322-63e2-4487-90bb-eee6c2711664","listingId":"861e207e-2459-4ae5-b0ee-62ff3c5a5f77","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"1000","chain":"base","payTo":"0x094f1608960A3cb06346cFd55B10b3cEc4f72c78","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x094f1608960A3cb06346cFd55B10b3cEc4f72c78","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://x402.artlu.workers.dev/paid","description":"Static testing","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true},"output":{"type":"text/plain","properties":{"message":{"type":"string","example":"****"}}}},"maxAmountRequired":"1000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:12.416Z"}],"sources":[{"listingId":"861e207e-2459-4ae5-b0ee-62ff3c5a5f77","source":"x402_bazaar","sourceId":"https://x402.artlu.workers.dev/paid","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:12.416Z","lastSeenAt":"2026-04-25T05:31:22.642Z"}],"details":{"listingId":"861e207e-2459-4ae5-b0ee-62ff3c5a5f77","quickStartSnippet":"curl -X POST https://x402.artlu.workers.dev/paid \\\n  -H \"X-PAYMENT: <your-x402-payment-header>\"","exampleRequest":null,"exampleResponse":{"message":"****"},"schema":{"input":{"type":"http","method":"GET","discoverable":true},"output":{"type":"text/plain","properties":{"message":{"type":"string","example":"****"}}}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The /paid endpoint is described as a 'static endpoint for testing ($0.001)'","source_url":"https://x402.artlu.workers.dev"},{"claim":"The API also gates blog posts behind x402 payments, e.g. /gated/the-forever-spreadsheet for $1.00","source_url":"https://x402.artlu.workers.dev"},{"claim":"Source code is MIT-licensed and available on GitHub","source_url":"https://github.com/artlu99/x402-blogposts-gate"},{"claim":"Payment is in USDC on Base network with maxAmountRequired of 1000 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://x402.artlu.workers.dev/paid"}],"useCases":["Testing x402 payment flow integration in agent or client code","Verifying USDC micropayment handling on the Base network","Smoke-testing x402-compatible wallets or libraries against a cheap live endpoint"],"bestFor":["Developers building x402-compatible agents or clients","Quick validation of micropayment plumbing at negligible cost ($0.001)","Learning how the x402 protocol challenge-response cycle works"],"notFor":["Production content delivery or meaningful data retrieval","High-throughput or latency-sensitive workloads (no SLA or performance guarantees)","Users needing rich structured data responses"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:13.307Z"},"updatedAt":"2026-04-25T05:31:22.642Z"}}