{"id":"fdeaf4c6-3f80-4d2c-9395-ea377b62687d","shortId":"qbuXrz","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","description":"This endpoint at lowpaymentfee.com provides premium API access to a specific portfolio resource (ID 64) via the x402 payment protocol. It is part of a broader platform that offers data & analytics, AI & machine learning, finance & Web3, and infrastructure utility APIs — all gated behind per-request USDC micropayments on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an X-PAYMENT header containing a signed USDC payment on Base. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nThe specific resource at `/api/v1/portfolios/64` is labeled \"Premium API Access\" but no further documentation describes the portfolio data schema or what fields are returned. The platform's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical detail. Without an OpenAPI spec, response examples, or field-level documentation, the exact shape of the response is unknown. Callers should expect a JSON object but will need to experiment to discover the schema.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","json-api","portfolio-data","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","premium data endpoint"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","The specific meaning of 'portfolios/64' is not documented anywhere in the crawled material","Platform lists many endpoint categories but none have detailed docs; quality of underlying services is unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/64","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/64","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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no response schema, no example responses, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The specific purpose of 'portfolios/64' is undocumented. This is effectively a stub 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'0.02':9,26,128 '000':123 '20':122 '6':133 '64':49 'Base network API' 'USDC pay-per-call' 'accept':89 'access':42,161 'addit':193 'ai':66 'amount':119 'analyt':65 'api':15,32,41,74,138,160,182 'attach':104 'base':7,24,85,116,124 'base-network' 'behind':77 'broader':60 'call':148 'caller':103,215 'commit':146 'connect':188 'contain':110 'data':64,169 'decim':134 'describ':166 'detail':195 'discov':227 'doc':179 'document':165,206 'endpoint':5,22,36,88 'exact':208 'exampl':201 'expect':217 'experi':225 'field':173,204 'field-level':203 'financ':69 'gate':3,20,76 'handl':97 'header':109 'id':48 'independ':150 'infrastructur':72 'inlin':98 'json':94,219 'json-api' 'key':16,33,139 'label':158 'learn':68 'level':205 'limit':142 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':67 'maximum':118 'micropay':82 'micropayment API' 'need':17,34,223 'network':86 'no-api-key' 'object':220 'offer':63 'openapi':198 'page':183 'paid':151 'part':57 'pay':8,25 'payment':53,95,108,114 'per':10,27,79 'per-request':78 'per-request-billing' 'platform':61,177 'portfolio':4,21,46,168 'portfolio API' 'portfolio-data' 'post':90 'premium':40,159 'premium data endpoint' 'price':180 'prompt':190 'protocol':54,102 'provid':39 'rate':141 'render':185 'request':11,28,80,91 'requir':120 'resourc':47,154 'respons':200,212 'return':93,175 'schema':170,229 'shape':209 'sign':112 'sinc':130 'spec':199 'specif':45,153 'subscript':145 'technic':194 'unit':125 'unknown':214 'usd':129 'usdc':13,30,81,113,127,131 'usdc-micropayment' 'use':132 'util':73 'via':50,99 'wallet':189 'web3':70 'without':196 'x':107 'x-payment':106 'x402':2,19,52,101 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"17fc2a08-c573-4d90-937c-a0cc91b8ee7c","listingId":"fdeaf4c6-3f80-4d2c-9395-ea377b62687d","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:10.302Z"}],"sources":[{"listingId":"fdeaf4c6-3f80-4d2c-9395-ea377b62687d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:10.302Z","lastSeenAt":"2026-04-27T20:08:58.434Z"}],"details":{"listingId":"fdeaf4c6-3f80-4d2c-9395-ea377b62687d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/64 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","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","source_url":"https://lowpaymentfee.com/api/v1/portfolios/64"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/64"},{"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":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Integrating pay-per-call financial data into autonomous agent workflows","Accessing premium API resources without managing API keys or subscriptions"],"bestFor":["Agents or apps that need keyless, pay-per-use API access","Developers experimenting with x402 micropayment-gated endpoints","Use cases where per-request billing at $0.02 is preferable to subscriptions"],"notFor":["High-volume bulk data retrieval where per-request costs add up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.126Z"},"updatedAt":"2026-04-27T20:08:58.434Z"}}