{"id":"d37d7e8d-5a7a-4550-9a9f-24b560766969","shortId":"9BdXnG","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides access to a \"portfolios\" resource (ID 60) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call 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/60` is listed under \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x8335…2913 on Base) to the provider's wallet. The x402 challenge advertises a maxAmountRequired of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments.\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 endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality the \"portfolios/60\" resource provides. Callers should be prepared to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","portfolio-data"],"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/60.","The purpose and data returned by the 'portfolios/60' endpoint is undocumented and unclear.","No robots.txt or agents.txt found on the origin."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/60","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/60","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 description of what the portfolios/60 resource actually returns. The listing is essentially a stub with confirmed 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'/api/v1/portfolios/60':93 '/docs':171 '/pricing':172 '/readme':175 '0.02':9,26,135,149 '000':130 '0x8335':113 '20':129 '2913':114 '402':213 '6':139 '60':46 'Base network API' 'USDC pay-per-call' 'accept':101 'access':40,99 'across':152 'actual':204 'advertis':125 'ai/ml':72 'analyt':71 'api':15,32,67,98,157 'base':7,24,86,116,131 'base-network' 'behind':81 'broader':57 'call':66 'caller':229 'chain':109 'challeng':124,214 'commit':165 'confirm':146 'connect':181 'contact':236 'content':187 'contract':112 'data':70,75,222 'decim':140 'descript':198 'detail':240 'document':166,217 'dozen':61 'endpoint':5,22,36,68,92,154,203,207 'equal':134 'exampl':195 'experi':234 'extrem':168 'finance/web3':74 'flat':148 'function':224 'gate':3,20,80 'id':45 'infer':73 'infrastructur':77 'key':16,33,158 'land':144 'limit':161 'list':95 'live':209 'lowpaymentfee' 'lowpaymentfee.com':38 'maxamountrequir':127 'micropay':83 'micropayment API' 'minimum':164 'network':87 'no-api-key' 'offer':60 'on-chain':107 'openapi':191 'page':145,176 'part':54 'pay':8,25,64 'pay-per-cal':63 'pay-per-request' 'payment':50,104 'per':10,27,65,150 'platform':58,142 'portfolio':4,21,43,202 'portfolio API' 'portfolio-data' 'portfolios/60':226 'post':102 'premium':97 'premium API access' 'prepar':232 'prompt':183 'proper':212 'protocol':51 'provid':39,119,228,238 'rate':160 'render':178 'request':11,28,103,151 'request/response':194 'requir':17,34 'resourc':44,227 'return':205,210 'schema':192 'settl':106 'span':69 'spars':169 'specif':91 'substant':186 'unclear':220 'unit':132 'usd':136 'usdc':13,30,89,111,137 'usdc-micropayment' 'use':88,138 'util':78 'via':47,110 'wallet':121,182 'without':216 'x402':2,19,49,82,123 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"709645a4-f2cc-4e5a-baee-a2c38ee2e5b7","listingId":"d37d7e8d-5a7a-4550-9a9f-24b560766969","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:02.548Z"}],"sources":[{"listingId":"d37d7e8d-5a7a-4550-9a9f-24b560766969","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:02.548Z","lastSeenAt":"2026-04-27T21:34:10.082Z"}],"details":{"listingId":"d37d7e8d-5a7a-4550-9a9f-24b560766969","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/60 \\\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/60"},{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/60"}],"useCases":["Fetching portfolio data via a single micropayment without needing an API key","Agent-driven on-chain pay-per-call access to premium data endpoints","Integrating low-friction paid API calls into Web3 workflows"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users who need detailed API 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":"2026-02-17T23:13:59.483Z"},"updatedAt":"2026-04-27T21:34:10.082Z"}}