{"id":"b141b10c-dad4-436c-afbb-71a7e6500944","shortId":"Jwc9VL","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 via a POST request to `/api/v1/portfolios/42/holdings`. It uses the x402 payment protocol on the Base network, accepting USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — each call is individually settled on-chain.\n\nThe provider's landing page advertises a broad suite of APIs spanning data & analytics, AI/ML inference, finance & Web3 market data, and infrastructure utilities, all priced uniformly at $0.02 per request. However, the specific endpoint listed here targets portfolio holdings, which falls under the finance/Web3 category. The x402 challenge was successfully captured (HTTP 402 with valid accepts payload), confirming the endpoint is live.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive 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 path includes a hardcoded portfolio ID (42), and it is unclear whether other portfolio IDs are supported or how they are discovered.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-holdings","pay-per-call","no-api-key"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto portfolio","USDC pay-per-call","lowpaymentfee","Base network API","web3 portfolio data"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt","No OpenAPI or JSON schema describing request body or response format","Endpoint path contains a hardcoded portfolio ID (42); unclear if other IDs are valid","The nature and source of the 'holdings' data is unspecified — could be mock/demo data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/42/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/42/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The endpoint's actual input parameters and output format are 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'/api/v1/portfolios/42/holdings':50 '/docs':168 '/pricing':170 '/readme':172 '/request':17,34 '0.02':16,33,71,124 '000':75 '0x8335':64 '20':74 '2913':65 '402':149 '42':218 '6':79 'Base network API' 'USDC pay-per-call' 'accept':61,152,209 'access':40 'advertis':102 'ai/ml':111 'analyt':110 'api':7,24,82,107 'base':9,26,59,76 'base-network' 'beyond':160 'bodi':208 'broad':104 'call':4,21,90 'captur':147 'categori':141 'chain':96 'challeng':144 'confirm':154 'connect':178 'contain':202 'content':184 'contract':63 'cost':69 'crypto portfolio' 'data':44,109,116 'decim':80 'descript':195 'discov':233 'document':159 'endpoint':36,130,156,211 'exampl':192 'extrem':165 'fall':137 'field':198 'financ':113 'finance/web3':140 'hardcod':215 'hold':6,23,43,135,200 'howev':127 'http':148 'id':217,226 'includ':213 'individu':92 'infer':112 'infrastructur':118 'investment holdings' 'key':83 'land':100,162 'limit':86 'list':131 'live':158 'lowpaymentfee' 'lowpaymentfee.com':38 'market':115 'maximum':68 'network':60 'no-api-key' 'on-chain':94 'openapi':188 'page':101,163,173 'paramet':205 'path':212 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'payload':153 'payment':55 'per':3,20,72,125 'portfolio':5,22,42,134,216,225 'portfolio holdings API' 'portfolio-holdings' 'post':47,207 'price':121 'prompt':180 'protocol':56 'provid':39,98 'rate':85 'request':48,73,126 'request/response':191 'requir':88 'respons':201 'return':175 'schema':189 'settl':12,29,93 'span':108 'specif':129 'substant':183 'success':146 'suit':105 'support':228 'target':133 'thin':166 'unclear':222 'uniform':122 'unit':77 'usdc':14,31,62 'usdc-settlement' 'use':52 'util':119 'valid':151 'via':10,27,45 'wallet':179 'web3':114 'web3 portfolio data' 'whether':223 'x402':11,28,54,143 'x402 finance API' 'x402-payment'","prices":[{"id":"4c17190b-e58e-4074-910a-3a55181ba17e","listingId":"b141b10c-dad4-436c-afbb-71a7e6500944","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/42/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":"2026-04-18T18:52:59.574Z"}],"sources":[{"listingId":"b141b10c-dad4-436c-afbb-71a7e6500944","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/42/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:59.574Z","lastSeenAt":"2026-04-28T09:06:26.132Z"}],"details":{"listingId":"b141b10c-dad4-436c-afbb-71a7e6500944","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/42/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":"Endpoint returns HTTP 402 with x402 challenge on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/portfolios/42/holdings"},{"claim":"Max amount required is 20000 base units of USDC (6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/42/holdings"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/42/holdings"}],"useCases":["Retrieve holdings data for a specific portfolio on demand","Integrate portfolio position data into trading bots or dashboards","Agent-driven portfolio analysis without managing API keys"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that can settle x402 payments on Base","Quick prototyping without subscription commitments"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","High-frequency bulk 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":"2026-02-17T23:13:59.6Z"},"updatedAt":"2026-04-28T09:06:26.132Z"}}