{"id":"9037c278-10a0-4ce9-9421-90d48ad072b8","shortId":"5MkEze","kind":"x402","title":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 13 via a POST request, gated behind an x402 payment challenge. The endpoint accepts USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.\n\nThe provider site (lowpaymentfee.com) hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request. However, the specific endpoint being listed here — `/api/v1/portfolios/13/holdings` — is not explicitly documented on the provider's landing page or in any crawled documentation. The endpoint is live and returns a valid x402 challenge, but there is no schema, example request body, or example response available. The description \"Premium API Access\" is the only metadata provided by the x402 challenge itself.\n\nBecause no documentation exists for this specific endpoint beyond the x402 challenge, the exact request body format and response structure are unknown. Callers should expect a JSON response (mimeType is application/json) but will need to experiment or contact the provider for details on required POST body fields.","tags":[],"capabilities":["portfolio-holdings","x402-payment","usdc-micropayment","base-network","pay-per-request","json-api"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","asset allocation","holdings endpoint","x402 finance API"],"warnings":["No documentation exists for /api/v1/portfolios/13/holdings — it is not listed on the provider's landing page among advertised APIs","Request body schema and response format are completely unknown","Only portfolio ID 13 is confirmed; availability of other portfolio IDs is unverified","Provider docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/13/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/13/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and the specific portfolio holdings endpoint is not listed on the provider's own landing page. Effectively a stub with confirmed 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'0.02':11,24,57,69,116 '000':63 '13':37 '20':62 '6':67 'accept':50 'access':78,168 'ai/ml':106 'analyt':105 'api':71,102,167 'application/json':209 'asset allocation' 'avail':163 'base':9,22,54,64 'base-network' 'behind':43 'beyond':187 'bodi':159,194,224 'broad':95 'call':59,101 'caller':201 'catalog':96 'challeng':47,151,177,190 'contact':216 'crawl':140 'data':4,17,33,104,109 'decim':68 'descript':165 'detail':220 'document':130,141,181 'endpoint':28,49,122,143,186 'exact':192 'exampl':157,161 'exist':182 'expect':203 'experi':214 'explicit':129 'field':225 'finance/web3':108 'format':195 'gate':42 'grant':80 'hold':3,16,32 'holdings endpoint' 'host':93 'howev':119 'id':36 'infer':107 'infrastructur':111 'investment holdings' 'json':205 'json-api' 'key':72 'land':135 'limit':75 'list':124 'live':145 'lowpaymentfee.com':30,92 'maxamountrequir':60 'metadata':172 'micropay':7,20 'mimetyp':207 'need':212 'network':55 'page':136 'pay':99 'pay-per-cal':98 'pay-per-request' 'payment':46,87 'per':12,25,58,82,100,117 'per-request':81 'portfolio':2,15,35 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':40,223 'premium':166 'price':114 'protocol':88 'provid':90,133,173,218 'rate':74 'request':13,26,41,83,118,158,193 'requir':77,222 'respons':162,197,206 'retriev':1,14 'return':31,147 'schema':156 'site':91 'span':103 'specif':121,185 'structur':198 'unit':65 'unknown':200 'usdc':51 'usdc-micropayment' 'util':112 'valid':149 'via':5,18,38,84 'x402':6,19,45,86,150,176,189 'x402 finance API' 'x402-payment'","prices":[{"id":"490ad718-7182-403c-8821-c9fe3925de2b","listingId":"9037c278-10a0-4ce9-9421-90d48ad072b8","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/13/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":"2026-04-18T18:52:15.865Z"}],"sources":[{"listingId":"9037c278-10a0-4ce9-9421-90d48ad072b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/13/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:15.865Z","lastSeenAt":"2026-04-28T07:34:37.736Z"}],"details":{"listingId":"9037c278-10a0-4ce9-9421-90d48ad072b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/13/holdings \\\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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/13/holdings"},{"claim":"The provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC uses 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current holdings for a specific investment portfolio","Programmatic portfolio monitoring by AI agents","Integrating portfolio data into dashboards or analytics pipelines"],"bestFor":["Agents needing on-demand portfolio holdings data without API key management","Micropayment-based access to financial data","Developers prototyping portfolio tracking tools"],"notFor":["Users needing documented request/response schemas before integrating","High-frequency polling where per-request costs accumulate quickly","Accessing portfolios other than ID 13 (only this ID is confirmed live)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.743Z"},"updatedAt":"2026-04-28T07:34:37.736Z"}}