{"id":"4c198ad5-8516-4310-b159-957a380c6c48","shortId":"gPKpf3","kind":"x402","title":"x402-protected addition endpoint (currently returning 500 errors)","tagline":"x402-protected addition endpoint (currently returning 500 errors)","description":"This endpoint at x402-ai-starter-khaki.vercel.app/api/add appears to be an x402-protocol demonstration service that provides access to a simple addition API behind a payment wall. The endpoint name suggests it performs an arithmetic addition operation, likely as a starter/demo project for the x402 payment protocol on Vercel.\n\nHowever, at the time of probing, the endpoint returns HTTP 500 Internal Server Error on all methods (POST and GET) and across all crawled pages including the root, docs, API base, pricing, and README paths. No x402 payment challenge was returned, no documentation or schema information is available, and the entire Vercel deployment appears to be non-functional. Without a working deployment, no further details about request/response formats, pricing, or capabilities can be determined.\n\nGiven the naming pattern (\"x402-ai-starter-khaki\"), this is likely a personal or tutorial deployment of an x402 starter template that is no longer maintained or has a configuration issue.","tags":[],"capabilities":["x402-payment","arithmetic-addition","demo-endpoint"],"categories":["compute"],"synonyms":["x402 demo","x402 starter","paid addition API","x402 arithmetic","protected endpoint"],"warnings":["Endpoint returns HTTP 500 Internal Server Error on all requests (POST and GET)","No x402 payment challenge was returned — endpoint is not functioning as an x402 service","All pages on the deployment (root, docs, api, pricing, README) return 500 errors","Likely an abandoned or misconfigured personal/tutorial deployment","No schema, documentation, or pricing information available"],"endpointUrl":"https://x402-ai-starter-khaki.vercel.app/api/add","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","extra":{"name":"USDC","version":"2"},"payTo":"0x12938506bBFeCcd291dFD35BbF1333CDAB2322EF","scheme":"exact","network":"base-sepolia","mimeType":"application/json","resource":"https://x402-ai-starter-khaki.vercel.app/api/add","description":"Access to protected content","outputSchema":{"input":{"type":"http","method":"POST","discoverable":true}},"maxAmountRequired":"5000","maxTimeoutSeconds":300}]},"qualityScore":"0.100","qualityRationale":"The endpoint returns HTTP 500 on every method and every path. No x402 challenge was captured, no documentation is available, and the entire deployment is non-functional. The listing title and description from the Bazaar record are generic placeholders. This is effectively a dead 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'500':8,17,78 'access':36 'across':89 'addit':4,13,40,54 'ai':149 'api':41,97 'appear':25,121 'arithmet':53 'arithmetic-addition' 'avail':115 'base':98 'behind':42 'capabl':139 'challeng':106 'configur':173 'crawl':91 'current':6,15 'demo-endpoint' 'demonstr':32 'deploy':120,130,159 'detail':133 'determin':142 'doc':96 'document':110 'endpoint':5,14,20,47,75 'entir':118 'error':9,18,81 'format':136 'function':126 'get':87 'given':143 'howev':68 'http':77 'includ':93 'inform':113 'intern':79 'issu':174 'khaki':151 'like':56,154 'longer':168 'maintain':169 'method':84 'name':48,145 'non':125 'non-funct':124 'oper':55 'page':92 'paid addition API' 'path':102 'pattern':146 'payment':44,64,105 'perform':51 'person':156 'post':85 'price':99,137 'probe':73 'project':60 'protect':3,12 'protected endpoint' 'protocol':31,65 'provid':35 'readm':101 'request/response':135 'return':7,16,76,108 'root':95 'schema':112 'server':80 'servic':33 'simpl':39 'starter':150,163 'starter/demo':59 'suggest':49 'templat':164 'time':71 'tutori':158 'vercel':67,119 'wall':45 'without':127 'work':129 'x402':2,11,30,63,104,148,162 'x402 arithmetic' 'x402 demo' 'x402 starter' 'x402-ai-starter-khaki':147 'x402-ai-starter-khaki.vercel.app':23 'x402-ai-starter-khaki.vercel.app/api/add':22 'x402-payment' 'x402-protected':1,10 'x402-protocol':29","prices":[{"id":"de1ea0c8-dbac-47ad-b87c-e6fa91d7cbf2","listingId":"4c198ad5-8516-4310-b159-957a380c6c48","amountUsd":null,"unit":"per_call","nativeCurrency":"USDC","nativeAmount":"5000","chain":"base-sepolia","payTo":"0x12938506bBFeCcd291dFD35BbF1333CDAB2322EF","paymentMethod":"x402-usdc","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","extra":{"name":"USDC","version":"2"},"payTo":"0x12938506bBFeCcd291dFD35BbF1333CDAB2322EF","scheme":"exact","network":"base-sepolia","mimeType":"application/json","resource":"https://x402-ai-starter-khaki.vercel.app/api/add","description":"Access to protected content","outputSchema":{"input":{"type":"http","method":"POST","discoverable":true}},"maxAmountRequired":"5000","maxTimeoutSeconds":300}],"asset_contract":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:32.788Z"}],"sources":[{"listingId":"4c198ad5-8516-4310-b159-957a380c6c48","source":"x402_bazaar","sourceId":"https://x402-ai-starter-khaki.vercel.app/api/add","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:32.788Z","lastSeenAt":"2026-04-22T02:30:11.985Z"}],"details":{"listingId":"4c198ad5-8516-4310-b159-957a380c6c48","quickStartSnippet":"# Endpoint is currently down (500). When live, a typical x402 call would be:\ncurl -X POST https://x402-ai-starter-khaki.vercel.app/api/add \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"a\": 2, \"b\": 3}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"POST","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 500 on both POST and GET requests","source_url":"https://x402-ai-starter-khaki.vercel.app/api/add"},{"claim":"Root and all crawled pages return Internal Server Error","source_url":"https://x402-ai-starter-khaki.vercel.app"}],"useCases":["Learning how x402 payment protocol works","Testing x402 client implementations against a simple endpoint","Demonstrating pay-per-call API patterns"],"bestFor":["Developers experimenting with x402 protocol","x402 client library testing"],"notFor":["Production arithmetic or computation needs","Any use case requiring a reliable, live endpoint","Applications needing guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:14:04.259Z"},"updatedAt":"2026-04-22T02:30:11.985Z"}}