{"id":"966fa171-198e-483b-a0ba-749b41553f90","shortId":"eqphmu","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base (USDC, $0.02/request).","tagline":"Portfolio holdings data via x402 micropayment on Base (USDC, $0.02/request).","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 65. 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 market data, and infrastructure utilities — all priced at $0.02 per request and settled via the x402 protocol using USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/65/holdings` accepts POST requests and is gated behind an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is instant upon payment.\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. The endpoint is live (returns a proper 402 challenge), but the lack of documentation means callers must discover the request format and response shape experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","micropayment"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content.","No request body schema or response schema provided; callers must guess the expected input and output format.","The endpoint is hardcoded to portfolio ID 65 with no explanation of what this portfolio represents.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/65/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/65/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 with clear pricing, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs ('Connect wallet'). The purpose of portfolio 65 specifically is unexplained. Effectively a stub 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'/request':11,22 '0.02':10,21,67,114 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':125 '0x8335':108 '20':102 '2913':109 '300':128 '402':192 '6':118 '65':34 'Base network API' 'USDC micropayment API' 'accept':86 'access':139 'address':124 'advertis':138 'ai/ml':56 'amount':99 'analyt':55 'api':51,132,151 'base':8,19,80,104,111 'behind':92 'broader':40 'call':50 'caller':200 'challeng':96,193 'connect':160 'contain':184 'content':166 'crawl':149 'data':3,14,30,54,60 'decim':119 'descript':177 'discov':202 'doc':150 'document':144,198 'dozen':45 'endpoint':24,52,84,186 'equal':113 'exampl':174 'experiment':209 'extrem':146 'field':180 'finance/web3':58 'format':205 'gate':91 'given':115 'hold':2,13,29,182 'id':33 'infer':57 'infrastructur':62 'instant':141 'investment holdings' 'key':133 'lack':196 'limit':136 'live':188 'lowpaymentfee' 'lowpaymentfee.com':26,42 'made':122 'market':59 'maximum':98 'mean':199 'micropay':6,17 'micropayment' 'must':201 'network':81 'no-api-key' 'offer':44 'openapi':170 'page':155 'part':37 'pay':48 'pay-per-cal':47 'pay-per-request' 'payment':95,120,143 'per':49,68 'platform':41 'portfolio':1,12,28,32 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':87 'price':65,152 'prompt':162 'proper':191 'protocol':75 'rate':135 'readm':154 'request':69,88,204 'request/response':173 'requir':100 'respons':183,207 'return':27,157,189 'schema':171 'second':129 'settl':71 'shape':208 'span':53 'spars':147 'specif':83 'timeout':130 'unit':105 'upon':142 'usdc':9,20,77,107,116 'usdc-base' 'use':76 'util':63 'via':4,15,72 'wallet':161 'x402':5,16,74,94 'x402 finance API' 'x402-payment'","prices":[{"id":"2cea2d54-5eb2-40ef-bc76-218761f74994","listingId":"966fa171-198e-483b-a0ba-749b41553f90","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/65/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":"2026-04-18T18:53:23.028Z"}],"sources":[{"listingId":"966fa171-198e-483b-a0ba-749b41553f90","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/65/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:23.028Z","lastSeenAt":"2026-04-27T17:05:04.930Z"}],"details":{"listingId":"966fa171-198e-483b-a0ba-749b41553f90","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/65/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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/65/holdings"},{"claim":"All endpoints on the platform are priced at $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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/65/holdings"}],"useCases":["Retrieve holdings data for a specific portfolio via a single micropayment","Integrate portfolio data into automated trading or analytics pipelines","Agent-driven portfolio monitoring without API key management"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that can settle x402 payments on Base","Quick one-off portfolio lookups without subscription commitments"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","Bulk or high-frequency data retrieval where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.543Z"},"updatedAt":"2026-04-27T17:05:04.930Z"}}