{"id":"c5b105e3-cda6-4bd4-b3e1-9401fa72758f","shortId":"xZWRCs","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 `/api/v1/portfolios/53` 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 endpoint is labeled \"Premium API Access\" and accepts POST requests, returning JSON responses. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 exact-payment scheme.\n\nThe x402 challenge advertises a `maxAmountRequired` of 20000 base units. USDC uses 6 decimals, so the per-request cost is $0.02 — consistent with the site-wide flat pricing of $0.02 per request. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid payment proof. The endpoint was confirmed live via a 402 challenge response.\n\nBecause this specific path (`/portfolios/53`) is not listed on the provider's landing page among the documented API categories, its exact data payload is unclear. The name \"Premium API Access\" and the `/portfolios/` path suggest it returns portfolio-related data (possibly financial or analytical), but no response schema, sample output, or detailed documentation was found. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","portfolio-data","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","premium data endpoint"],"warnings":["No response schema or example output available for /api/v1/portfolios/53","This specific endpoint path is not listed on the provider's landing page among documented APIs","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content","Exact nature of 'portfolio' data returned is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no response schema, no example payloads, and the specific /portfolios/53 path is not listed among the provider's documented APIs. Effectively a stub with verified 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'/portfolios':192 '/portfolios/53':164 '0.02':10,24,116,126 '0x8335':86 '20000':102 '2913':87 '402':157 '6':107 'Base network API' 'USDC micropayment API' 'accept':70 'access':68,189 'addit':231 'advertis':98,136 'ai/ml':55 'among':174 'analyt':54,204 'api':51,67,130,177,188,220 'attach':139 'base':8,22,81,103 'base-network' 'caller':137 'categori':178 'challeng':97,158 'collect':42 'confirm':153 'connect':226 'consist':117 'content':232 'contract':85 'cost':114 'data':5,19,53,181,200 'decim':108 'detail':212 'doc':217 'document':176,213 'endpoint':6,20,30,63,151 'exact':92,180 'exact-pay':91 'finance/web3':57 'financi':202 'flat':123 'found':215 'gate':3,17 'header':144 'infer':56 'infrastructur':59 'json':74 'json-response' 'key':131 'label':65 'land':172 'limit':134 'list':167 'live':154 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':100 'name':186 'network':82 'no-api-key' 'offer':40 'output':210 'page':173,221 'part':34 'path':163,193 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payload':182 'payment':76,93,143,148 'per':11,25,49,112,127 'per-request':111 'platform':38 'portfolio':4,18,198 'portfolio API' 'portfolio-data' 'portfolio-rel':197 'possibl':201 'post':71 'premium':66,187 'premium data endpoint' 'price':124,218 'prompt':228 'proof':149 'protocol':46 'provid':170 'rate':133 'relat':199 'request':12,26,50,72,113,128 'respons':75,159,207 'return':73,196,223 'sampl':209 'schema':208 'scheme':94 'settl':78 'simpli':138 'site':121 'site-wid':120 'span':52 'specif':62,162 'suggest':194 'unclear':184 'unit':104 'usdc':14,28,84,105 'usdc-settlement' 'use':83,106 'util':60 'valid':147 'via':88,155 'wallet':227 'wide':122 'x':142 'x-payment':141 'x402':2,16,45,90,96 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"49c6b943-c951-4115-9197-5840fddf259e","listingId":"c5b105e3-cda6-4bd4-b3e1-9401fa72758f","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:10.939Z"}],"sources":[{"listingId":"c5b105e3-cda6-4bd4-b3e1-9401fa72758f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:10.939Z","lastSeenAt":"2026-04-27T20:08:58.464Z"}],"details":{"listingId":"c5b105e3-cda6-4bd4-b3e1-9401fa72758f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/53 \\\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":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/53"},{"claim":"Site-wide pricing is $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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/53"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Integrating pay-as-you-go financial data into agent workflows without API key management","Programmatic access to portfolio information settled on Base L2"],"bestFor":["Agents or services that need keyless, pay-per-request data access","Developers building on Base who want USDC-settled API calls","Low-volume or bursty consumers who prefer no subscriptions or commitments"],"notFor":["Users who need detailed documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.033Z"},"updatedAt":"2026-04-27T20:08:58.464Z"}}