{"id":"e0397fba-6489-4d18-9a96-907742cd0aac","shortId":"nKJapk","kind":"x402","title":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a \"portfolios\" resource (specifically portfolio ID 4) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/4` accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is independently paid for via the x402 payment header.\n\nThe platform advertises a uniform $0.02/request pricing across all its endpoints. Documentation pages exist at /docs, /pricing, and /api but currently render only a \"Connect wallet\" prompt, so detailed request/response schemas for this specific portfolios endpoint are not publicly documented. The exact data returned by the portfolios endpoint is unclear from available materials — the endpoint title is simply \"Premium API Access\" with no further specification of the portfolio data structure.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","json-response","post-method","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["No request or response schema available — the exact data returned by /api/v1/portfolios/4 is unknown","Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no usable content","The endpoint name 'Premium API Access' is generic and does not describe the actual resource","Cannot verify what portfolio data (if any) is actually served behind the paywall"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, and the docs/pricing/API pages all render only a wallet-connect prompt. The actual data returned by the portfolios endpoint is completely 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'/api/v1/portfolios/4':86 '/docs':159 '/pricing':160 '/request':149 '0.02':10,24,114,148 '000':109 '0x8335':99 '20':108 '2913':100 '4':42 '6':118 'Base network API' 'USDC API' 'accept':87 'access':34,204 'across':151 'advertis':145 'ai/ml':67 'amount':106 'analyt':66 'api':62,123,203 'avail':195 'base':8,22,81,102,110 'base-network' 'behind':76 'broader':53 'call':61,133 'commit':131 'connect':168 'contract':98 'current':164 'data':5,19,65,70,186,212 'decim':119 'detail':172 'document':155,183 'dozen':56 'endpoint':6,20,30,63,85,154,179,191,198 'equal':113 'exact':185 'exist':157 'finance/web3':69 'gate':3,17,75 'header':142 'id':41 'independ':135 'infer':68 'infrastructur':72 'json':92 'json-response' 'key':124 'limit':127 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':196 'maximum':105 'micropay':78 'micropayment API' 'network':82 'offer':55 'page':156 'paid':136 'part':50 'pay':9,23,59 'pay-per-cal':58 'pay-per-call API' 'payment':46,93,141 'per':11,25,60 'per-request-pricing' 'platform':54,144 'portfolio':4,18,37,40,178,190,211 'portfolio API' 'portfolio-data' 'post':88 'post-method' 'premium':202 'price':150 'prompt':170 'protocol':47 'provid':33 'public':182 'rate':126 'render':165 'request':12,26,89 'request/response':173 'resourc':38 'return':91,187 'schema':174 'settl':95 'simpli':201 'span':64 'specif':39,84,177,208 'structur':213 'subscript':130 'titl':199 'unclear':193 'uniform':147 'unit':111 'usd':115 'usdc':14,28,97,116 'usdc-settlement' 'use':117 'util':73 'via':43,138 'wallet':169 'x402':2,16,45,77,140 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8688cec8-94ec-46b3-a573-a03dd90ba1a9","listingId":"e0397fba-6489-4d18-9a96-907742cd0aac","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:41.740Z"}],"sources":[{"listingId":"e0397fba-6489-4d18-9a96-907742cd0aac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:41.740Z","lastSeenAt":"2026-04-27T22:33:20.690Z"}],"details":{"listingId":"e0397fba-6489-4d18-9a96-907742cd0aac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/4 \\\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 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/4"},{"claim":"The platform advertises $0.02/request pricing 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/4"}],"useCases":["Fetching portfolio data with per-request USDC micropayments on Base","Agent-driven data retrieval without API key management","Programmatic access to premium data behind x402 paywall"],"bestFor":["Agents or applications that can settle x402 payments in USDC on Base","Developers wanting keyless, pay-as-you-go API access","Low-volume or sporadic callers who don't want subscriptions"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.52Z"},"updatedAt":"2026-04-27T22:33:20.690Z"}}