{"id":"28d210c9-2ce5-4565-8605-c7daa4c1163a","shortId":"FN7BJ6","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 specific portfolio resource (ID 43) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs 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/43` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the portfolios endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality the portfolio resource provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","portfolio-data","post-method"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access"],"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 /api/v1/portfolios/43","It is unclear what data the 'portfolios/43' endpoint actually returns","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/43","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the portfolios/43 resource actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/portfolios/43':86 '/docs':162 '/pricing':163 '/readme':166 '0.02':10,24,112 '000':116 '0x8335':103 '20':115 '2913':104 '402':206 '43':41 '6':120 'Base network API' 'USDC pay-per-call' 'accept':94 'access':34,92,133 'actual':196 'advertis':124 'ai/ml':67 'analyt':66 'api':63,91,126 'attach':136 'avail':156 'base':8,22,81,106,117 'base-network' 'behind':76 'broader':52 'call':62 'caller':134 'challeng':207 'confirm':201 'connect':172 'contract':102 'cost':110 'data':5,19,65,70,215 'decim':121 'descript':190 'detail':179 'document':148,210 'endpoint':6,20,30,85,157,195,199 'extrem':150 'finance/web3':69 'function':217 'gate':3,17,75 'header':141 'id':40 'infer':68 'infrastructur':72 'instant':132 'key':127 'land':153 'limit':130 'list':88,155 'live':202 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':109 'micropay':78 'micropayment API' 'network':82 'offer':55 'openapi':183 'page':154,167 'part':49 'pay':9,23,60 'pay-per-cal':59 'pay-per-request' 'payment':45,97,140,146 'per':11,25,61,113 'platform':53,123 'portfolio':4,18,38,194,219 'portfolio API' 'portfolio-data' 'post':95 'post-method' 'premium':90 'premium API access' 'price':159 'prompt':174 'proof':147 'proper':205 'protocol':46 'provid':33,221 'rate':129 'render':169 'request':12,26,96,114 'request/response':186 'resourc':39,220 'return':197,203 'schema':187 'settl':99 'simpli':135 'span':64 'spars':151 'spec':184 'specif':37,84 'technic':178 'unclear':213 'unit':118 'usdc':14,28,101 'usdc-settlement' 'util':73 'valid':144 'varieti':57 'via':42 'wallet':173 'without':209 'x':139 'x-payment':138 'x402':2,16,44,77,145 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"438ddcca-1b80-4916-a4fa-f2c77613f679","listingId":"28d210c9-2ce5-4565-8605-c7daa4c1163a","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:51.255Z"}],"sources":[{"listingId":"28d210c9-2ce5-4565-8605-c7daa4c1163a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:51.255Z","lastSeenAt":"2026-04-27T22:33:21.061Z"}],"details":{"listingId":"28d210c9-2ce5-4565-8605-c7daa4c1163a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/43 \\\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 endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/43"},{"claim":"Platform 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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/43"}],"useCases":["Fetching portfolio data with per-request USDC micropayments","Agent-driven access to financial portfolio information without API keys","Programmatic portfolio queries settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-call portfolio data 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 response schemas before integrating","High-volume consumers who need bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.053Z"},"updatedAt":"2026-04-27T22:33:21.061Z"}}