{"id":"a19d726e-9190-4b0a-8a69-a9680ebfe47e","shortId":"y59S4n","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 10) via the x402 payment protocol. The provider operates a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 challenges on the Base network, payable in USDC.\n\nThe specific endpoint `/api/v1/portfolios/10` returns JSON and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys are required; payment is handled entirely through the X-PAYMENT header. The challenge specifies a 300-second timeout window for payment settlement.\n\nDocumentation is extremely sparse — 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 endpoint actually returns. The provider's landing page confirms a flat $0.02/request pricing model across all endpoints with no rate limits and no API keys required, but gives no detail about the data served by this particular route.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","portfolio-data","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for the portfolios endpoint.","Unknown what data the /api/v1/portfolios/10 endpoint actually returns — 'Premium API Access' is the only description.","No request or response examples available anywhere in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/10","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what portfolio data is actually returned. The docs/pricing/API pages are all empty beyond a wallet-connect prompt, making this effectively a stub 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'/request':194 '0.02':10,24,112,193 '000':101 '0x8335':106 '10':42 '20':100 '2913':107 '300':138 '402 payment endpoint' '6':117 'Base network API' 'USDC micropayment API' 'accept':89 'access':34 'across':197 'actual':183 'advertis':95 'ai/ml':63 'analyt':62 'api':59,120,152,206 'base':8,22,77,102,109 'base-network' 'behind':72 'broad':52 'call':58 'catalog':53 'challeng':74,94,135 'confirm':190 'connect':160 'content':166 'cost':98 'crypto payment API' 'data':5,19,61,66,215 'decim':118 'descript':177 'detail':212 'doc':150 'document':145 'endpoint':6,20,30,84,182,199 'entir':127 'equal':111 'exampl':174 'extrem':147 'finance/web3':65 'flat':192 'gate':3,17,71 'give':210 'handl':126 'header':133 'id':41 'infer':64 'infrastructur':68 'json':87 'json-response' 'key':121,207 'land':188 'limit':203 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':97 'model':196 'network':78 'no-api-key' 'openapi':170 'oper':50 'page':155,189 'particular':219 'pay':9,23,56 'pay-per-cal':55 'pay-per-call API' 'pay-per-request' 'payabl':79 'payment':46,124,132,143 'per':11,25,57,113 'portfolio':4,18,37,40,181 'portfolio API' 'portfolio-data' 'post':90 'price':151,195 'prompt':162 'protocol':47 'provid':33,49,186 'rate':202 'readm':154 'render':157 'request':12,26,91,114 'request/response':173 'requir':123,208 'resourc':38 'return':86,184 'rout':220 'schema':171 'second':139 'serv':216 'settlement':144 'span':60 'spars':148 'specif':39,83 'specifi':136 'substant':165 'timeout':140 'unit':103 'usdc':14,28,81,105,115 'usdc-settlement' 'use':116 'util':69 'via':43 'wallet':161 'window':141 'x':131 'x-payment':130 'x402':2,16,45,73,93 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"82b05a9d-47f5-4810-8c65-9c0d11338512","listingId":"a19d726e-9190-4b0a-8a69-a9680ebfe47e","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:22.490Z"}],"sources":[{"listingId":"a19d726e-9190-4b0a-8a69-a9680ebfe47e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:22.490Z","lastSeenAt":"2026-04-28T07:05:45.420Z"}],"details":{"listingId":"a19d726e-9190-4b0a-8a69-a9680ebfe47e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/10 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/10"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/10"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Agent-driven data retrieval without pre-registration or API keys","Integrating pay-as-you-go financial data into automated workflows"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.441Z"},"updatedAt":"2026-04-28T07:05:45.420Z"}}