{"id":"b83ffed9-23f5-44e5-b032-faaad6ee3a06","shortId":"ck5LSB","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 16. It is part of a broader platform offering various paid API endpoints 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 x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the site's advertised flat pricing of $0.02 per request. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /api, /pricing, /README) appear to require a wallet connection and did not yield substantive content during crawl, so details about the request body schema, response fields, and the specific data returned by this holdings endpoint are unknown. The endpoint is confirmed live (402 challenge captured), but the lack of documentation means callers will need to experiment or connect a wallet to discover the expected input format and output structure.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","json-api","micropayment","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No request body schema documented — callers must guess or discover the expected POST payload","No response schema or example available — the actual data returned is unknown","All documentation pages require wallet connection and were not crawlable","This specific endpoint (/portfolios/16/holdings) is not listed on the site's landing page among advertised APIs","The platform lists many diverse API categories (AI, finance, geocoding, etc.) at identical pricing — unclear if all are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/16/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/16/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation for request body schema, response format, or what 'portfolio 16 holdings' actually contains. The docs/pricing/README pages all require wallet connection and yielded no content. This is effectively a stub 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'/docs':156 '/pricing':158 '/readme':159 '0.02':10,22,116,127 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '16':36 '20':106 '300':139 '402':199 '6':112 'Base network API' 'USDC micropayment API' 'accept':71 'access':153 'across':49 'address':135 'advertis':123,144 'ai/ml':52 'amount':101 'analyt':51 'api':47,146 'appear':160 'base':8,20,65,98,108 'bodi':179 'broader':42 'call':104 'caller':85,208 'captur':201 'categori':56 'challeng':200 'confirm':197 'connect':165,214 'consist':118 'content':171 'crawl':173 'crypto portfolio' 'data':3,15,32,50,186 'decim':113 'detail':175 'discov':218 'document':154,206 'endpoint':26,48,70,191,195 'equal':115 'expect':220 'experi':212 'field':182 'finance/web3':53 'flat':124 'format':222 'handl':79 'header':91 'hold':2,14,31,190 'id':35 'includ':86 'infrastructur':55 'inlin':80 'input':221 'instant':152 'investment holdings' 'json':76 'json-api' 'key':147 'lack':204 'limit':150 'live':198 'lowpaymentfee' 'lowpaymentfee.com':28 'maximum':100 'mean':207 'micropay':6,18 'micropayment' 'need':210 'network':9,21,66 'no-api-key' 'offer':44 'output':224 'page':155 'paid':46 'part':39 'payment':77,90,96,131 'per':11,23,103,128 'platform':43,143 'portfolio':1,13,30,34 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':72 'price':125 'protocol':62,84 'rate':149 'request':12,24,73,129,178 'requir':102,162 'respons':181 'return':29,75,187 'schema':180 'second':140 'sent':133 'settl':58 'sign':94 'site':121 'specif':185 'structur':225 'substant':170 'timeout':141 'unit':109 'unknown':193 'usd':117 'usdc':68,95,111 'usdc-base' 'use':67 'various':45 'via':4,16,59,81 'wallet':164,216 'x':89 'x-payment':88 'x402':5,17,61,83 'x402 finance API' 'x402-payment' 'yield':169","prices":[{"id":"9ab8a541-79f7-4302-a2d8-ca4311a81b4f","listingId":"b83ffed9-23f5-44e5-b032-faaad6ee3a06","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/16/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":"2026-04-18T18:52:13.481Z"}],"sources":[{"listingId":"b83ffed9-23f5-44e5-b032-faaad6ee3a06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/16/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:13.481Z","lastSeenAt":"2026-04-28T07:34:37.683Z"}],"details":{"listingId":"b83ffed9-23f5-44e5-b032-faaad6ee3a06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/16/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/16/holdings"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/16/holdings"}],"useCases":["Retrieve holdings data for a specific portfolio","Integrate portfolio data into trading dashboards or analytics tools","Automate portfolio monitoring with per-request micropayments","Agent-driven portfolio analysis without API key management"],"bestFor":["Developers wanting pay-per-call portfolio data without subscriptions","AI agents that can settle x402 payments on Base","Low-volume or sporadic portfolio data lookups at $0.02 each"],"notFor":["Users who need detailed API documentation before integrating","High-frequency bulk data retrieval where per-call pricing adds up","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.826Z"},"updatedAt":"2026-04-28T07:34:37.683Z"}}