{"id":"fb300bbf-eede-473f-84c6-4ee7fde1421f","shortId":"cDHky9","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at `/api/v1/portfolios/63` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/63` resource is listed under \"Premium API Access\" but its exact data payload is not documented beyond the generic description. All endpoints on the platform share the same pricing model: $0.02 per request, settled in USDC on the Base network.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) requesting payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the \"exact\" scheme. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is `application/json` and the method is POST. No API key or account registration is needed; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/portfolios/63` resource actually returns. The platform appears to be a demonstration or early-stage deployment of x402-gated microservices. Without knowing the response schema, callers should treat this as an exploratory endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The exact nature of the 'portfolios/63' resource is unknown — the description is just 'Premium API Access'","Platform appears to be early-stage or a demo; reliability and data quality are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/63","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a well-formed x402 challenge, but there is zero documentation on what the /portfolios/63 resource returns, no OpenAPI spec, no request body schema, and no example responses. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/portfolios/63':69,217 '0.02':9,26,99,136 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':130 '20':124 '2913':131 '300':149 '402':120 '6':134 'Base network API' 'USDC micropayment API' 'access':76,171 'account':167 'actual':219 'addit':200 'address':145 'ai/ml':61 'analyt':60 'api':15,32,57,75,164,187 'appear':223 'application/json':157 'base':7,24,107,126,133 'beyond':85 'caller':243 'challeng':118 'collect':48 'connect':195 'data':59,80 'decim':135 'demonstr':227 'deploy':232 'descript':88,213 'detail':202 'doc':185 'document':84,180 'earli':230 'early-stag':229 'endpoint':5,22,36,90,110,250 'exact':79,139 'exploratori':249 'extrem':182 'finance/web3':63 'gate':3,20,236 'generic':87 'grant':173 'header':179 'http':119 'infer':62 'infrastructur':65 'json-api' 'key':16,33,165 'know':239 'list':72 'live':112 'lowpaymentfee' 'lowpaymentfee.com':43 'method':160 'microservic':237 'mime':154 'model':98 'need':170 'network':108 'no-api-key' 'offer':46 'openapi':206 'page':190 'part':40 'pay':8,25,54 'pay-per-call API' 'pay-per-request':53 'payload':81 'payment':122,141,178 'per':10,27,55,100 'platform':44,93,222 'portfolio':4,21 'portfolio API' 'portfolio-data' 'post':162 'premium':74 'premium API access' 'price':97,186 'prompt':197 'protocol':52 'pure':174 'readm':189 'registr':168 'render':192 'request':11,28,56,101,121 'request/response':209 'requir':17,34 'resourc':70,218 'respons':153,241 'return':114,220 'schema':210,242 'scheme':140 'second':150 'sent':143 'settl':102 'share':94 'span':58 'spars':183 'spec':207 'specif':68 'stage':231 'technic':201 'timeout':151 'treat':245 'type':155 'unit':127 'usdc':13,30,104,129 'usdc-base' 'util':66 'valid':116 'via':137 'wallet':196 'without':238 'x402':2,19,51,117,177,235 'x402 API' 'x402-gated':1,18,234 'x402-payment' 'x402-protocol':50","prices":[{"id":"fa1c276a-fdf5-4e57-9323-887b8d992e03","listingId":"fb300bbf-eede-473f-84c6-4ee7fde1421f","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:07.339Z"}],"sources":[{"listingId":"fb300bbf-eede-473f-84c6-4ee7fde1421f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:07.339Z","lastSeenAt":"2026-04-27T21:34:10.248Z"}],"details":{"listingId":"fb300bbf-eede-473f-84c6-4ee7fde1421f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/63 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/63"},{"claim":"All endpoints on the platform cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/63"}],"useCases":["Fetching portfolio data (resource ID 63) via a single paid POST request","Demonstrating x402 protocol payment flows on Base","Agent-driven data retrieval without pre-registration or API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-per-request API access"],"notFor":["Production workloads requiring documented response schemas","Users who need free or subscription-based access","Applications needing high-throughput bulk data retrieval (no documented rate limits but per-call payment adds friction)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.254Z"},"updatedAt":"2026-04-27T21:34:10.248Z"}}