{"id":"8d54c6e3-e44f-40e5-89b9-dc813a55cb84","shortId":"RPhPNc","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 portfolio ID 93. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated behind the x402 payment protocol on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC (USD Coin) on Base at a cost of $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds.\n\nThe specific data returned by this holdings endpoint is not documented in detail. The platform's landing page lists this endpoint under a generic \"Premium API Access\" label, and the crawled docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no further documentation. Because of this, the exact request body schema and response structure are unknown. The endpoint is confirmed live (returns a valid 402 challenge), but prospective callers should be aware that documentation is essentially absent.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","lowpaymentfee","Base USDC API","micropayment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all resolve to a minimal 'Connect wallet' prompt with no content.","Request body schema and response schema are completely unknown; no examples provided by the provider.","The meaning of 'portfolio 93' is unexplained — it is unclear whether this is a public demo portfolio or user-specific data.","No SLA, uptime, or support information available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/93/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/93/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 documentation of request/response schemas, no OpenAPI spec, and the crawled pages beyond the landing page are empty wallet-connect stubs. The specific purpose of portfolio 93 holdings is 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'000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '20':102 '300':141 '402':212 '6':107 '93':36 'Base USDC API' 'absent':224 'accept':78 'access':169 'address':134 'ai/ml':58 'analyt':57 'api':53,110,168,177 'attach':121 'awar':219 'base':8,20,74,92,104 'behind':67 'bodi':197 'broader':42 'call':52 'caller':119,216 'challeng':213 'coin':90 'commit':116 'confirm':207 'connect':184 'cost':95 'crawl':173 'crypto portfolio' 'data':3,15,32,56,61,145 'decim':108 'detail':155 'doc':174 'document':153,190,221 'dozen':47 'endpoint':26,54,77,150,163,205 'essenti':223 'exact':195 'finance/web3':60 'gate':66 'generic':166 'header':125 'hold':2,14,31,149 'id':35 'infer':59 'investment holdings' 'json':83 'json-response' 'key':111 'label':170 'land':159 'limit':113 'list':161 'live':208 'lowpaymentfee' 'lowpaymentfee.com':28,44 'maxamountrequir':100 'maximum':138 'micropay':6,18 'micropayment API' 'minim':183 'network':9,21,75 'no-api-key' 'offer':46 'page':160,178 'part':39 'pay':50 'pay-per-cal':49 'pay-per-request' 'payment':70,84,124,130 'per':11,23,51,98 'platform':43,157 'portfolio':1,13,30,34 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':79 'premium':167 'price':175 'prompt':186 'prospect':215 'protocol':71 'rate':112 'request':12,24,80,99,128,196 'requir':118 'resolv':180 'respons':200 'return':29,82,146,209 'schema':198 'second':142 'sent':132 'servic':64 'settl':86 'simpli':120 'span':55 'specif':144 'structur':201 'timeout':139 'unit':105 'unknown':203 'upfront':115 'usd':89 'usdc':88 'usdc-base' 'util':63 'valid':211 'via':4,16 'wallet':185 'x402':5,17,69,123 'x402 finance API' 'x402-payment'","prices":[{"id":"d5bde148-66b1-4328-a8d1-dec1ce93a457","listingId":"8d54c6e3-e44f-40e5-89b9-dc813a55cb84","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/93/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":"2026-04-18T18:53:36.855Z"}],"sources":[{"listingId":"8d54c6e3-e44f-40e5-89b9-dc813a55cb84","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/93/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:36.855Z","lastSeenAt":"2026-04-27T14:05:19.286Z"}],"details":{"listingId":"8d54c6e3-e44f-40e5-89b9-dc813a55cb84","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/93/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 402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/93/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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/93/holdings"}],"useCases":["Retrieving holdings data for a specific portfolio via automated agents","Integrating portfolio position data into dashboards or analytics pipelines","Programmatic access to holdings without API key management"],"bestFor":["Agents that need on-demand portfolio holdings data with no signup","Developers experimenting with x402 micropayment-gated APIs","Workflows requiring low-cost, pay-per-call financial data"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","Bulk data retrieval where per-request pricing would be cost-prohibitive","Production systems requiring SLA or uptime guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.825Z"},"updatedAt":"2026-04-27T14:05:19.286Z"}}