{"id":"20f01989-8e8e-4c5f-af4b-1c8d466a8955","shortId":"pbJDEH","kind":"x402","title":"Pay-per-call portfolio holdings API on Base, settled in USDC via x402.","tagline":"Pay-per-call portfolio holdings API on Base, settled in USDC via x402.","description":"This endpoint at lowpaymentfee.com provides access to portfolio holdings data for a specific portfolio (ID 89) via a POST request. It is part of a broader platform offering data & analytics, AI/ML, finance/Web3, and infrastructure APIs, all priced at $0.02 per request with no API keys, no rate limits, and instant access.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The endpoint returns application/json and has a payment timeout of 300 seconds.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The specific request body schema and response format for the holdings endpoint are not documented anywhere in the crawled material. The endpoint is confirmed live, returning a proper 402 x402 challenge, but without documentation it is difficult to know what POST body to send or what the response structure looks like.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-holdings","pay-per-call","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","financial holdings endpoint","x402 finance API","USDC micropayment API"],"warnings":["No API documentation available — docs, pricing, and API pages only show 'Connect wallet'","Request body schema for POST is unknown","Response schema is unknown","The specific portfolio ID (89) is hardcoded in the URL with no explanation of what it represents","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/89/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/89/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 documentation on request body format, response schema, or what 'portfolio 89' represents. Docs pages are empty. This is effectively a stub 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'000':103 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':94 '20':102 '300':125 '402':176 '6':113 '89':44 'USDC micropayment API' 'access':34,79 'ai/ml':59 'amount':97 'analyt':58 'anywher':163 'api':7,21,63,72,135 'application/json':118 'base':9,23,89,104 'base-network' 'bodi':151,189 'broader':54 'call':4,18,100 'challeng':178 'confirm':171 'connect':141 'content':147 'contract':93 'crawl':166 'data':38,57 'decim':114 'difficult':184 'doc':132 'document':127,162,181 'endpoint':30,116,159,169 'equal':109 'extrem':129 'finance/web3':60 'financial holdings endpoint' 'format':155 'handl':82 'hold':6,20,37,158 'id':43 'infrastructur':62 'instant':78 'investment holdings' 'json-response' 'key':73 'know':186 'like':198 'limit':76 'live':172 'look':197 'lowpaymentfee.com':32 'materi':167 'maximum':96 'network':90 'no-api-key' 'offer':56 'page':136 'part':51 'pay':2,16 'pay-per-cal':1,15 'pay-per-call' 'payment':80,122 'per':3,17,68,99 'platform':55 'portfolio':5,19,36,42 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':47,188 'price':65,133 'prompt':143 'proper':175 'protocol':86 'provid':33 'rate':75 'render':138 'request':48,69,150 'requir':98 'respons':154,195 'return':117,173 'schema':152 'second':126 'send':191 'settl':10,24 'spars':130 'specif':41,149 'structur':196 'timeout':123 'unit':105 'usdc':12,26,92,107,111 'usdc-settlement' 'use':91,112 'via':13,27,45,83 'wallet':142 'without':180 'x402':14,28,85,177 'x402 finance API' 'x402-payment'","prices":[{"id":"c1aa2b24-e465-4e37-b2c8-1cbe33c384c8","listingId":"20f01989-8e8e-4c5f-af4b-1c8d466a8955","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/89/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":"2026-04-18T18:53:41.669Z"}],"sources":[{"listingId":"20f01989-8e8e-4c5f-af4b-1c8d466a8955","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/89/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:41.669Z","lastSeenAt":"2026-04-27T14:05:19.487Z"}],"details":{"listingId":"20f01989-8e8e-4c5f-af4b-1c8d466a8955","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/89/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/89/holdings"},{"claim":"All APIs on the platform are priced at $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 network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/89/holdings"}],"useCases":["Retrieving holdings data for a specific investment portfolio","Integrating portfolio position data into dashboards or analytics tools","Agent-driven portfolio monitoring with per-call payment"],"bestFor":["Developers needing on-demand portfolio holdings without subscription commitments","AI agents that can settle USDC payments on Base via x402","Applications requiring low-cost, keyless API access to financial data"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Bulk or high-frequency data retrieval where per-call pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.602Z"},"updatedAt":"2026-04-27T14:05:19.487Z"}}