{"id":"2bd6783b-07c5-4450-9f37-f7377ae16fb7","shortId":"sEgjVk","kind":"x402","title":"Retrieve portfolio holdings via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve portfolio holdings via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio #32 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network — the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider's landing page lists a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced at $0.02 per request. This specific endpoint falls under the finance/Web3 category and appears to serve portfolio holdings information, though the exact response schema is not documented. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what the response payload looks like.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","pay-per-call","no-api-key","json-response"],"categories":["finance"],"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 pages all return only a wallet connect prompt with no content.","No request body schema documented; it is unknown what POST body the endpoint expects.","No response schema or example response available; the actual data returned is unverified.","The endpoint serves portfolio #32 specifically; it is unclear whether other portfolio IDs are accessible or what portfolio #32 represents."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/32/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/32/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 zero documentation: no OpenAPI spec, no request/response schema, no examples. The docs pages are empty wallet-connect stubs. The purpose of the endpoint can only be inferred from the URL 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'/docs':163 '/pricing':164 '/readme':167 '0.02':10,22,48,72,124 '000':63 '20':62 '32':34 '402':204 '6':68 'Base USDC API' 'accept':152 'advertis':58 'ai/ml':113 'analyt':112 'api':74,109 'appear':136 'application/json':157 'attach':83 'avail':192 'base':8,20,53,64 'bodi':214 'broad':102 'call':46,108 'caller':81 'catalog':103 'categori':134 'challeng':57,205 'confirm':199 'connect':173 'content':179 'cost':47 'crawl':195 'crypto portfolio' 'data':31,111,117 'decim':69 'document':149,158,208 'endpoint':26,129,151,197 'equal':71 'exact':144 'exampl':191 'expect':216 'extrem':160 'fall':130 'finance/crypto':115 'finance/web3':133 'gate':39 'header':88 'hold':3,15,30,140 'holdings endpoint' 'infer':114 'inform':141 'investment holdings' 'json-response' 'key':75 'land':98 'like':223 'limit':78 'list':100 'live':200 'look':222 'lowpaymentfee.com':28 'market':116 'maxamountrequir':60 'micropay':6,18 'network':54 'no-api-key' 'openapi':183 'page':99,168 'pay':106 'pay-per-cal':105 'pay-per-call' 'payload':221 'payment':43,87,93 'per':11,23,107,125 'portfolio':2,14,33,139 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':37,153 'price':122 'prompt':175 'proof':94 'proper':203 'protocol':44 'provid':96 'rate':77 'render':170 'request':12,24,38,126,154,213 'request/response':186 'requir':80 'respons':145,220 'retriev':1,13 'return':29,156,201 'schema':146,187 'serv':138 'servic':120 'simpli':82 'span':110 'spars':161 'spec':184 'specif':128 'though':142 'unclear':211 'unit':65 'usag':190 'usdc':50,67 'usdc-base' 'util':119 'valid':91 'via':4,16,35 'wallet':174 'without':207 'x':86 'x-payment':85 'x402':5,17,42,56,92 'x402 finance API' 'x402-payment'","prices":[{"id":"3718df5d-f734-45a2-b7e6-c8f7bd180c25","listingId":"2bd6783b-07c5-4450-9f37-f7377ae16fb7","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/32/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":"2026-04-18T18:52:39.337Z"}],"sources":[{"listingId":"2bd6783b-07c5-4450-9f37-f7377ae16fb7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/32/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:39.337Z","lastSeenAt":"2026-04-28T14:35:21.789Z"}],"details":{"listingId":"2bd6783b-07c5-4450-9f37-f7377ae16fb7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/32/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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32/holdings"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32/holdings"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists finance/Web3, AI/ML, data analytics, and infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current holdings for a specific portfolio programmatically","Integrating portfolio data into dashboards or trading bots","Querying holdings as part of an automated financial analysis pipeline"],"bestFor":["Agents or apps that need on-demand portfolio holdings without managing API keys","Developers experimenting with x402 micropayment-gated APIs","Low-volume, pay-as-you-go portfolio data retrieval"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-frequency bulk data retrieval where per-call pricing adds up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.634Z"},"updatedAt":"2026-04-28T14:35:21.789Z"}}