{"id":"3ebd9cfd-4ce4-48ef-bd91-c6cb04d9be62","shortId":"RG8bcZ","kind":"x402","title":"Pay-per-call portfolio holdings API on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call portfolio holdings API on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to portfolio holdings data (portfolio ID 99) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; callers pay per request using the x402 payment header.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains or what parameters the POST body accepts. The endpoint is confirmed live (returns a valid 402 challenge), but the actual data returned after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-holdings","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","holdings endpoint","USDC micropayment API"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body format and response fields are unknown","Endpoint is scoped to a single portfolio ID (99); unclear if other portfolio IDs are available or how they are discovered","The platform lists many API categories but this specific endpoint's data source and accuracy are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/99/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/99/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 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of the specific endpoint (portfolio 99 holdings) is only inferable from the URL path. This is effectively a stub 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'0.02':16,33,83,118 '000':78 '0x8335':70 '20':77 '2913':71 '402':198 '6':88 '99':47 'USDC micropayment API' 'accept':54,189 'access':40,132 'actual':202 'advertis':123 'ai':107 'analyt':106 'api':7,24,102,125,149 'base':9,26,65,79 'base-network' 'bodi':188 'broader':96 'call':4,21 'caller':133 'categori':103 'challeng':199 'confirm':193 'connect':158 'contain':182 'content':164 'contract':69 'cost':75 'crawl':147 'crypto portfolio' 'data':44,105,203 'decim':89 'descript':175 'doc':148 'document':142 'endpoint':36,91,191 'equal':82 'exampl':172 'extrem':144 'field':178 'financ':110 'header':141 'hold':6,23,43,180 'holdings endpoint' 'id':46 'includ':104 'infrastructur':113 'instant':131 'investment holdings' 'json':59 'key':126 'learn':109 'limit':129 'live':194 'lowpaymentfee.com':38,98 'machin':108 'maximum':74 'multipl':101 'network':66 'no-api-key' 'offer':100 'openapi':168 'page':153 'paramet':185 'part':93 'pay':2,19,134 'pay-per-cal':1,18 'pay-per-call' 'payment':51,60,140,206 'per':3,20,84,119,135 'platform':97,122 'portfolio':5,22,42,45 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':55,187 'price':116,150 'prompt':160 'protocol':52 'provid':39 'rate':128 'readm':152 'request':56,85,120,136 'request/response':171 'respons':181 'return':58,155,195,204 'schema':169 'settl':12,29,62 'spars':145 'unit':80 'unknown':208 'usdc':14,31,68,86 'usdc-settlement' 'use':67,87,137 'util':114 'valid':197 'via':10,27,48 'wallet':159 'web3':111 'x402':11,28,50,139 'x402 finance API' 'x402-payment'","prices":[{"id":"7aca9270-c308-42ca-a2a5-0527feb3583e","listingId":"3ebd9cfd-4ce4-48ef-bd91-c6cb04d9be62","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/99/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":"2026-04-18T18:53:58.644Z"}],"sources":[{"listingId":"3ebd9cfd-4ce4-48ef-bd91-c6cb04d9be62","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/99/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:58.644Z","lastSeenAt":"2026-04-27T12:34:57.040Z"}],"details":{"listingId":"3ebd9cfd-4ce4-48ef-bd91-c6cb04d9be62","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/99/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 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/99/holdings"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/99/holdings"}],"useCases":["Retrieving holdings data for a specific portfolio via automated agents","Integrating portfolio position data into dashboards or analytics pipelines","Agent-driven portfolio monitoring with per-call USDC payments"],"bestFor":["Agents needing on-demand portfolio holdings without API key management","Developers wanting pay-per-use financial data on Base network","Automated workflows that need low-friction access to holdings data"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","High-frequency polling where per-call costs would accumulate significantly","Anyone requiring holdings for arbitrary portfolio IDs (this endpoint is scoped to portfolio 99)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.786Z"},"updatedAt":"2026-04-27T12:34:57.040Z"}}