{"id":"63837132-aad6-477f-b012-7bb817d7e85e","shortId":"c4uZh5","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for a specific portfolio (ID 20) via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML, finance/Web3, and infrastructure APIs, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the provider's address on Base. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nDocumentation beyond the landing page is extremely sparse. The /docs, /pricing, /api, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data content, request body format, and response structure for portfolio holdings are unknown.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","micropayment","json-api","per-request-pricing"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","Base USDC API","pay-per-call holdings"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt","No OpenAPI or schema definition found; request body format and response structure are unknown","The specific portfolio ID (20) is hardcoded in the URL; unclear if other portfolio IDs are accessible or what they represent","Provider site appears to list many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/20/holdings","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/20/holdings","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, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual data returned and expected request body are completely unknown, making this effectively a stub 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'/docs':149 '/pricing':150 '/readme':153 '0.02':10,22,62,109 '000':104 '20':38,103 '402':190 '6':114 'Base USDC API' 'accept':75 'actual':194 'addit':165 'address':120 'ai/ml':54 'analyt':53 'api':58,126 'avail':181 'base':8,20,71,105,122 'beyond':141 'bodi':198 'broader':49 'call':136 'caller':89 'challeng':191 'commit':134 'confirm':185 'connect':160 'content':196 'crypto portfolio' 'data':3,15,32,52,195 'decim':115 'detail':167 'document':140,176 'endpoint':26,74,183 'exampl':179 'extrem':146 'finance/web3':55 'format':199 'handl':83 'header':95 'hold':2,14,31,205 'id':37 'includ':90 'independ':138 'infrastructur':57 'inlin':84 'investment holdings' 'json':80 'json-api' 'key':127 'land':143 'limit':130 'live':186 'lowpaymentfee.com':28 'micropay':6,18 'micropayment' 'minim':159 'network':9,21,72 'offer':51 'openapi':171 'page':144,154 'paid':139 'part':46 'pay-per-call holdings' 'payload':180 'payment':42,81,94,99 'per':11,23,63 'per-request-pricing' 'platform':50 'portfolio':1,13,30,36,204 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':76 'price':60 'prompt':162 'proper':189 'protocol':43,88 'provid':118 'rate':129 'request':12,24,64,77,197 'request/response':174 'resolv':156 'respons':201 'return':29,79,187 'schema':175 'settl':66 'sign':98 'sinc':111 'spars':147 'spec':172 'specif':35 'structur':202 'subscript':133 'technic':166 'unit':106 'unknown':207 'usd':110 'usdc':68,108,112 'usdc-base' 'use':113 'via':4,16,39,85 'wallet':161 'x':93 'x-payment':92 'x402':5,17,41,87 'x402 finance API' 'x402-payment'","prices":[{"id":"7212b472-2991-4285-802f-2c84bb41fd08","listingId":"63837132-aad6-477f-b012-7bb817d7e85e","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/20/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:26.687Z"}],"sources":[{"listingId":"63837132-aad6-477f-b012-7bb817d7e85e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/20/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:26.687Z","lastSeenAt":"2026-04-28T05:04:34.786Z"}],"details":{"listingId":"63837132-aad6-477f-b012-7bb817d7e85e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/20/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/20/holdings"},{"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":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/20/holdings"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving current holdings for a specific investment portfolio","Integrating portfolio data into dashboards or trading bots","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Agents needing on-demand portfolio holdings without API key management","Developers who want pay-per-use financial data on Base network","Micropayment-based access to portfolio information"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","Bulk or high-frequency data retrieval where per-call pricing is inefficient","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.213Z"},"updatedAt":"2026-04-28T05:04:34.786Z"}}