{"id":"bdb0cc31-2e0e-4d90-a9ca-120ba24a0a01","shortId":"QmufjA","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 80. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-payment scheme. The max amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request. No API keys or rate limits are advertised; access is gated solely by micropayment. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no description of request parameters, and no example responses. The specific data returned by the /portfolios/80/holdings endpoint — what assets, what fields, what format — is not documented anywhere in the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","asset allocation","portfolio data","x402 finance API","Base USDC API","micropayment API"],"warnings":["No API documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content","No OpenAPI or schema describing request body or response format for this endpoint","The specific endpoint /portfolios/80/holdings is not listed on the provider's landing page among their advertised APIs","Response format and fields are completely unknown — integration requires blind experimentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/80/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/80/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, confirming it works. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific endpoint (/portfolios/80/holdings) is not even mentioned on the site. This is effectively a stub 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'0.02':10,22,111 '000':101 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '20':100 '300':132 '402':200 '80':36 'Base USDC API' 'accept':72 'access':122 'across':50 'advertis':121 'ai/ml':53 'amount':97 'analyt':52 'anywher':187 'api':49,115,143 'asset':179 'asset allocation' 'base':8,20,66,102,108 'broader':42 'categori':57 'challeng':201 'confirm':195 'connect':149 'content':155 'crawl':139,190 'data':3,15,32,51,172 'descript':162 'difficult':209 'doc':140 'document':134,186,206 'endpoint':26,71,177,193 'equal':110 'exact':92 'exact-pay':91 'exampl':168 'experiment':213 'extrem':136 'field':181 'finance/web3':54 'format':183 'gate':124 'handl':80 'header':87 'hold':2,14,31 'id':35 'infrastructur':56 'inlin':81 'investment holdings' 'json':77 'json-response' 'key':116 'lack':204 'limit':119 'live':196 'lowpaymentfee.com':28 'make':207 'materi':191 'max':96 'micropay':6,18,127 'micropayment API' 'network':9,21,67 'no-api-key' 'offer':44 'openapi':159 'page':144 'paramet':165 'part':39 'pay':46 'pay-per-request':45 'payment':78,86,93,129 'per':11,23,47,112 'platform':43 'portfolio':1,13,30,34 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':73 'price':141 'prompt':151 'protocol':63 'rate':118 'render':146 'request':12,24,48,74,113,164 'requir':98 'respons':169 'return':29,76,173,197 'schema':160 'scheme':94 'second':133 'settl':59 'sole':125 'spars':137 'specif':171 'timeout':130 'unit':103 'usdc':69,105 'usdc-base' 'use':68,88,211 'valid':199 'via':4,16,60,82 'wallet':150 'without':212 'x':85 'x-payment':84 'x402':5,17,62,90 'x402 finance API' 'x402-payment'","prices":[{"id":"ab1b2155-fd66-43be-9b60-c7b06e695295","listingId":"bdb0cc31-2e0e-4d90-a9ca-120ba24a0a01","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/80/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":"2026-04-18T18:53:30.281Z"}],"sources":[{"listingId":"bdb0cc31-2e0e-4d90-a9ca-120ba24a0a01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/80/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:30.281Z","lastSeenAt":"2026-04-27T15:34:26.130Z"}],"details":{"listingId":"bdb0cc31-2e0e-4d90-a9ca-120ba24a0a01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/80/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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/80/holdings"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/80/holdings"}],"useCases":["Retrieve holdings data for a specific portfolio via micropayment","Integrate portfolio data into trading bots or dashboards without API key management","Agent-driven portfolio analysis with per-call payment"],"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 schema before integrating","High-volume bulk data retrieval where per-call pricing adds up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.17Z"},"updatedAt":"2026-04-27T15:34:26.130Z"}}