{"id":"c76b154c-6356-4769-958e-e90c5781d55c","shortId":"X8Le5a","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 \"Premium API Access\" resource at `/api/v1/portfolios/42` via the x402 payment protocol. It is part of a broader platform offering numerous pay-per-call API endpoints across categories including data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific `/api/v1/portfolios/42` endpoint accepts POST requests and returns JSON. Payment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the payee address `0x1A2B...85F3`. No API keys are required; access is granted per-request upon valid payment. The platform advertises no rate limits and instant access.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact data returned by the portfolios endpoint is unknown; the name suggests financial portfolio information but this cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","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","crypto payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition; request body and response format are completely unknown","The purpose and data returned by /api/v1/portfolios/42 is unverified — 'portfolio' is inferred from the URL path only","Platform appears to be a demonstration or early-stage service with many generic endpoint names"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/42","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/42","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual data returned by /api/v1/portfolios/42 is entirely unknown. This is effectively a stub 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'/api/v1/portfolios/42':42,90 '/docs':172 '/pricing':174 '/readme':176 '0.02':10,24,78,128 '000':124 '0x1a2b':138 '20':123 '6':132 '85f3':139 'Base network API' 'USDC micropayment API' 'accept':92 'access':34,39,145,162 'across':63 'address':137 'advertis':156 'ai/ml':68 'analyt':67 'api':38,61,141 'attach':109 'avail':202,225 'base':8,22,86,125 'beyond':164 'broader':53 'call':60 'caller':108 'cannot':221 'categori':64 'confirm':223 'connect':182 'content':188 'crypto payment API' 'data':5,19,66,71,205 'decim':133 'document':163,197 'endpoint':6,20,30,62,91,210 'exact':105,204 'exact-pay':104 'exampl':200 'extrem':169 'finance/web3':70 'financi':216 'gate':3,17 'grant':147 'handl':100 'header':114 'i.e':127 'includ':65 'infer':69 'inform':218 'infrastructur':73 'instant':161 'json':97 'json-response' 'key':142 'land':166 'limit':159 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':226 'name':214 'network':87 'no-api-key' 'numer':56 'offer':55 'openapi':192 'page':167,177 'part':50 'pay':9,23,58 'pay-per-cal':57 'pay-per-call API' 'pay-per-request' 'paye':136 'payload':201 'payment':46,98,106,113,119,153 'per':11,25,59,79,149 'per-request':148 'platform':54,155 'portfolio':4,18,209,217 'portfolio API' 'portfolio-data' 'post':93 'post-method' 'premium':37 'premium API access' 'price':76 'prompt':184 'protocol':47 'provid':33 'rate':158 'render':179 'request':12,26,80,94,150 'request/response':195 'requir':144 'resourc':40 'return':96,206 'schema':196 'scheme':107 'settl':81 'sign':117 'sinc':129 'spars':170 'spec':193 'specif':89 'substant':187 'suggest':215 'unit':126 'unknown':212 'upon':151 'usdc':14,28,83,118,130 'usdc-base' 'use':131 'util':74 'valid':152 'via':43,101 'wallet':183 'x':112 'x-payment':111 'x402':2,16,45,103 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5fd8e9f0-fe68-4fa2-9e1f-873c1e7e61b2","listingId":"c76b154c-6356-4769-958e-e90c5781d55c","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:58.384Z"}],"sources":[{"listingId":"c76b154c-6356-4769-958e-e90c5781d55c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:58.384Z","lastSeenAt":"2026-04-27T22:33:21.455Z"}],"details":{"listingId":"c76b154c-6356-4769-958e-e90c5781d55c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/42 \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/42"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/42"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/42"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving portfolio data (likely financial) on a per-request payment basis","Integrating pay-per-call data access into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Agents or developers wanting keyless, pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic data consumers who prefer per-request billing"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","High-volume consumers who would benefit from subscription pricing","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.706Z"},"updatedAt":"2026-04-27T22:33:21.455Z"}}