{"id":"769b0b4f-3729-4187-ae4d-bb4cbfd6c631","shortId":"Ua5x6a","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated portfolio endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to a portfolio resource (portfolio ID 14) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/14` is listed under \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted per-request upon valid x402 payment. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio endpoint actually returns. The platform's landing page confirms the $0.02 per-request pricing model and lists many endpoints, but this specific portfolios endpoint is not listed among them, making its purpose unclear. It may return portfolio-related financial data, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-data","post-endpoint"],"categories":["finance","data"],"synonyms":["portfolio API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto payment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; response format is completely unknown","The /api/v1/portfolios/14 endpoint is not listed among the provider's advertised APIs on the landing page","Purpose of 'portfolio 14' is unclear — no description of what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/14","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/14","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific portfolio endpoint is not even listed on the provider's landing page. The purpose and output of this endpoint are 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'/request':16,32 '0.02':15,31,126,202 '000':121 '0x8335':111 '14':45 '20':120 '2913':112 '300':153 '6':129 'Base network API' 'USDC pay-per-call' 'accept':99 'access':38,97,139 'actual':193 'advertis':138 'ai/ml':70 'among':220 'amount':118 'analyt':69 'api':65,96,132,162 'base':7,23,84,114,122 'behind':79 'broader':56 'call':11,27 'chain':107 'confirm':200 'connect':170 'content':176 'contract':110 'crypto payment API' 'data':68,73,233 'decim':130 'descript':187 'doc':160 'document':155 'dozen':59 'endpoint':5,21,34,66,90,192,211,216 'equal':125 'exampl':184 'extrem':157 'finance/web3':72 'financi':232 'gate':3,19,78 'grant':141 'id':44 'infer':71 'infrastructur':75 'key':133 'land':198 'limit':136 'list':93,209,219 'lowpaymentfee' 'lowpaymentfee.com':36 'make':222 'mani':210 'maximum':117 'may':227 'micropay':81 'model':207 'network':85 'offer':58 'on-chain':105 'openapi':180 'page':165,199 'part':53 'pay':9,25,62 'pay-per-cal':8,24 'pay-per-request':61 'payment':49,102,148,150 'per':10,26,63,143,204 'per-request':142,203 'platform':57,196 'portfolio':4,20,41,43,191,215,230 'portfolio API' 'portfolio-data' 'portfolio-rel':229 'post':100 'post-endpoint' 'premium':95 'premium API access' 'price':161,206 'prompt':172 'protocol':50 'provid':37 'purpos':224 'rate':135 'readm':164 'relat':231 'render':167 'request':64,101,144,205 'request/response':183 'resourc':42 'return':194,228 'schema':181 'second':154 'settl':104 'span':67 'spars':158 'specif':89,214 'specul':237 'timeout':151 'unclear':225 'unit':123 'upon':145 'usdc':13,29,87,109,127 'usdc-base' 'use':86,128 'util':76 'valid':146 'via':46,108 'wallet':171 'x402':2,18,48,80,147 'x402 micropayment API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"f1f5e410-52a2-4fe2-a9d6-86d913a646db","listingId":"769b0b4f-3729-4187-ae4d-bb4cbfd6c631","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:23.666Z"}],"sources":[{"listingId":"769b0b4f-3729-4187-ae4d-bb4cbfd6c631","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:23.666Z","lastSeenAt":"2026-04-28T06:34:17.578Z"}],"details":{"listingId":"769b0b4f-3729-4187-ae4d-bb4cbfd6c631","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/14 \\\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 HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/14"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/14"},{"claim":"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":"Docs, pricing, API, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving portfolio data (ID 14) with a single USDC micropayment on Base","Integrating pay-per-request financial data into agent workflows without API keys","Demonstrating x402 protocol payment flows for on-chain API access"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.384Z"},"updatedAt":"2026-04-28T06:34:17.578Z"}}