{"id":"69ef8fed-190f-4c71-905b-4553fb75087f","shortId":"PpPnZ4","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","description":"This endpoint at `/api/v1/portfolios/38` 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/38` 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 via the x402 payment protocol.\n\nThe platform advertises a no-friction model: no API keys, no rate limits, no subscriptions, and instant access. Callers send a POST request with an `X-PAYMENT` header containing a signed x402 payment proof. The x402 challenge confirms the endpoint is live, accepting USDC (contract `0x8335…2913` on Base) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment timeout is 300 seconds.\n\nDocumentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/portfolios/38` resource actually returns. The endpoint is confirmed live via the 402 challenge, but without documentation it is unclear what input the POST body expects or what shape the response takes.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","portfolio-data","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto payment API"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; input and output formats are unknown","The specific purpose and data content of /portfolios/38 is not described anywhere","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is zero documentation on what the endpoint accepts or returns — docs pages are empty stubs. No OpenAPI schema, no examples, and the specific purpose of /portfolios/38 is 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'/portfolios/38':69,223 '0.02':9,26,99,175 '000':171 '0x8335':161 '20':170 '2913':162 '300':185 '402':234 '6':179 'Base network API' 'USDC micropayment API' 'accept':158 'access':76,132 'actual':225 'advertis':116 'ai/ml':61 'amount':168 'analyt':60 'api':15,32,57,75,123,194 'base':7,24,107,164,172 'base-network' 'beyond':85 'bodi':246 'caller':133 'challeng':152,235 'collect':48 'confirm':153,230 'connect':202 'contain':144 'content':208 'contract':160 'crypto payment API' 'data':59,80 'decim':180 'descript':88,219 'doc':192 'document':84,187,238 'endpoint':5,22,36,90,155,228 'exact':79 'exampl':216 'expect':247 'extrem':189 'finance/web3':63 'friction':120 'gate':3,20 'generic':87 'given':176 'header':143 'i.e':174 'infer':62 'infrastructur':65 'input':243 'instant':131 'json-response' 'key':16,33,124 'limit':127 'list':72 'live':157,231 'lowpaymentfee' 'lowpaymentfee.com':43 'max':167 'model':98,121 'need':17,34 'network':108 'no-api-key' 'no-frict':118 'offer':46 'openapi':212 'page':197 'part':40 'pay':8,25,54 'pay-per-call API' 'pay-per-request':53 'payload':81 'payment':112,142,148,182 'per':10,27,55,100 'platform':44,93,115 'portfolio':4,21 'portfolio API' 'portfolio-data' 'post':136,245 'premium':74 'price':97,193 'prompt':204 'proof':149 'protocol':52,113 'rate':126 'readm':196 'render':199 'request':11,28,56,101,137 'request/response':215 'resourc':70,224 'respons':252 'return':226 'schema':213 'second':186 'send':134 'settl':102 'shape':250 'share':94 'sign':146 'span':58 'specif':68 'subscript':129 'substant':207 'take':253 'thin':190 'timeout':183 'unclear':241 'unit':173 'usdc':13,30,104,159,177 'usdc-settlement' 'util':66 'via':109,232 'wallet':203 'without':237 'x':141 'x-payment':140 'x402':2,19,51,111,147,151 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"412d308d-499e-405e-b01e-b4d4f59ad52c","listingId":"69ef8fed-190f-4c71-905b-4553fb75087f","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:47.089Z"}],"sources":[{"listingId":"69ef8fed-190f-4c71-905b-4553fb75087f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:47.089Z","lastSeenAt":"2026-04-27T22:33:20.903Z"}],"details":{"listingId":"69ef8fed-190f-4c71-905b-4553fb75087f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms USDC on Base with maxAmountRequired of 20000 base units (=$0.02) and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/portfolios/38"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/38"}],"useCases":["Fetching portfolio data (resource #38) via a single micropayment without account setup","Integrating pay-per-request data access into autonomous agents using x402","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing frictionless, keyless API access on Base","Low-volume, on-demand data retrieval without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume batch processing where per-request fees add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.202Z"},"updatedAt":"2026-04-27T22:33:20.903Z"}}