{"id":"629800f2-d06f-4867-af0c-737cff7de6b2","shortId":"JJcMrv","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 40) behind an x402 paywall. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility 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 via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The x402 challenge specifies an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys, rate limits, or subscriptions are required — each call is independently paid.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no explanation of what fields the holdings response contains or what POST body (if any) is expected. The endpoint is live (402 challenge confirmed), but without documentation it is difficult to know exactly what data is returned or what input parameters are supported.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","json-api","micropayment","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","crypto portfolio","holdings endpoint","x402 finance API","Base USDC API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt","No request body schema or response schema documented; callers must discover behavior empirically","Endpoint is scoped to a single portfolio ID (40); unclear if other portfolio IDs are available","The platform lists many other endpoints on its homepage but this specific holdings endpoint is not among them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/40/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/40/holdings","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, but there is no OpenAPI spec, no request/response schema, and all documentation pages are empty stubs showing only 'Connect wallet'. The specific purpose of portfolio 40 holdings is 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'/docs':152 '/pricing':154 '/readme':156 '0.02':10,22,63,126 '000':115 '0x8335':120 '20':114 '2913':121 '40':38 '402':199 '6':130 'Base USDC API' 'accept':76 'ai/ml':53 'analyt':52 'api':59,133 'base':8,20,72,116,123 'behind':39 'bodi':190 'broader':48 'call':142 'caller':89 'challeng':104,200 'confirm':201 'connect':162 'contain':186 'content':168 'crawl':151 'crypto portfolio' 'data':3,15,32,51,212 'decim':131 'difficult':207 'document':146,204 'endpoint':26,75,196 'equal':125 'exact':108,210 'exact-schem':107 'expect':194 'explan':179 'extrem':148 'field':182 'finance/web3':55 'given':127 'handl':84 'header':96 'hold':2,14,31,184 'holdings endpoint' 'id':37 'includ':91 'independ':144 'infer':54 'infrastructur':57 'input':217 'investment holdings' 'json':81 'json-api' 'key':134 'know':209 'limit':136 'live':198 'lowpaymentfee.com':28 'micropay':6,18 'micropayment' 'must':90 'network':9,21,73 'offer':50 'openapi':172 'page':157 'paid':145 'paramet':218 'part':45 'pay-per-request' 'payment':82,95,100,110 'paywal':42 'per':11,23,64 'platform':49 'portfolio':1,13,30,36 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':77,189 'price':61 'prompt':164 'proof':101 'protocol':88 'rate':135 'request':12,24,65,78 'request/response':175 'requir':140 'respons':185 'return':29,80,159,214 'schema':176 'scheme':109 'settl':67 'spars':149 'spec':173 'specif':35 'specifi':105 'subscript':138 'substant':167 'support':220 'unit':117 'usdc':69,119,128 'usdc-base' 'util':58 'valid':99 'via':4,16,85 'wallet':163 'without':203 'x':94 'x-payment':93 'x402':5,17,41,87,103 'x402 finance API' 'x402-payment'","prices":[{"id":"6e790076-e796-4dc5-ba29-337cf1d7f715","listingId":"629800f2-d06f-4867-af0c-737cff7de6b2","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/40/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":"2026-04-18T18:52:44.114Z"}],"sources":[{"listingId":"629800f2-d06f-4867-af0c-737cff7de6b2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/40/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:44.114Z","lastSeenAt":"2026-04-27T22:33:20.815Z"}],"details":{"listingId":"629800f2-d06f-4867-af0c-737cff7de6b2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/40/holdings \\\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 x402 challenge requires up to 20,000 base units of USDC on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/portfolios/40/holdings"},{"claim":"The 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":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/40/holdings"}],"useCases":["Retrieving holdings data for portfolio #40 programmatically","Integrating portfolio data into dashboards or trading bots","Agent-driven portfolio analysis with per-call micropayments"],"bestFor":["Developers needing on-demand portfolio holdings without subscriptions","AI agents that can settle x402 payments on Base","Low-volume or sporadic access to portfolio data at $0.02/call"],"notFor":["High-frequency bulk data retrieval (no documented batch endpoint)","Users who need detailed API documentation or schema guarantees before integrating","Accessing arbitrary portfolio IDs (this endpoint is scoped to portfolio 40)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.334Z"},"updatedAt":"2026-04-27T22:33:20.815Z"}}