{"id":"21e8d04a-d7d9-4ff2-bfa7-fa78f87776cb","shortId":"DCt6n6","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/portfolios/72` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/72` resource is listed under \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment settles in USDC on the Base network.\n\nThe x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which translates to $0.02 per request. The platform's landing page confirms uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required. The endpoint returns `application/json` responses.\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 documentation, and no examples available. The exact data returned by `/api/v1/portfolios/72` is unknown; the name \"Premium API Access\" and the path suggest it may return portfolio-related data, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific data returned by /api/v1/portfolios/72 is undocumented and cannot be verified","The platform lists many diverse endpoints (AI, finance, utilities) all at $0.02 — unclear if all are fully functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/72","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) with clear pricing ($0.02/request in USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of '/portfolios/72' specifically is 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'/portfolios/72':61 '/request':121 '0.02':110,120 '000':96 '0x8335':101 '20':95 '2913':102 '6':105 'Base network API' 'USDC micropayment API' 'accept':70 'access':68,191 'across':123 'addit':163 'advertis':90 'ai/ml':53 'amount':93 'analyt':52 'api':49,67,128,150,190 'application/json':141 'avail':178,209 'base':7,20,85,97,104 'base-network' 'call':48 'cannot':205 'challeng':78,89 'collect':40 'commit':136 'confirm':118,207 'connect':158 'crypto payment API' 'data':51,181,202 'decim':106 'detail':165 'doc':148 'document':143,174 'endpoint':5,18,28,125,139 'exact':180 'exampl':177 'extrem':145 'finance/web3':55 'gate':3,16,73 'infer':54 'infrastructur':57 'json-response' 'key':129 'land':116 'limit':132 'list':64 'lowpaymentfee' 'lowpaymentfee.com':35 'materi':210 'maximum':92 'may':197 'minimum':135 'name':188 'network':86 'no-api-key' 'offer':38 'openapi':169 'page':117,153 'part':32 'path':194 'pay':9,22,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-request':8,21 'payment':77,79 'per':10,23,47,111 'platform':36,114 'portfolio':4,17,200 'portfolio API' 'portfolio-rel':199 'post':71 'post-method' 'premium':66,189 'price':122,149 'prompt':160 'protocol':44 'rate':131 'readm':152 'relat':201 'render':155 'request':11,24,72,112 'request/response':172 'requir':137 'resourc':62 'respons':142 'return':140,182,198 'schema':173 'settl':80 'span':50 'spars':146 'spec':170 'specif':60 'suggest':195 'technic':164 'translat':108 'uniform':119 'unit':98 'unknown':186 'usdc':13,26,82,100 'usdc-settlement' 'util':58 'wallet':159 'x402':2,15,43,76,88 'x402 API' 'x402-gated':1,14 'x402-payment' 'x402-protocol':42","prices":[{"id":"b173d815-b9dd-4456-839a-2ac4e6208c69","listingId":"21e8d04a-d7d9-4ff2-bfa7-fa78f87776cb","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:18.249Z"}],"sources":[{"listingId":"21e8d04a-d7d9-4ff2-bfa7-fa78f87776cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:18.249Z","lastSeenAt":"2026-04-27T18:36:24.642Z"}],"details":{"listingId":"21e8d04a-d7d9-4ff2-bfa7-fa78f87776cb","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without payment, it returns 402 with the payment challenge.\ncurl -X POST https://lowpaymentfee.com/api/v1/portfolios/72 \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/72"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint is described as 'Premium API Access' and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/portfolios/72"}],"useCases":["Fetching portfolio data via a single micropayment without needing an API key","Integrating pay-per-call data access into autonomous agent workflows","Testing x402 protocol payment flows on Base network"],"bestFor":["Agents or developers wanting keyless, pay-per-request API access","x402 protocol integrations on Base","Low-friction micropayment API consumption"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume batch requests where per-call pricing may add up","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.705Z"},"updatedAt":"2026-04-27T18:36:24.642Z"}}