{"id":"08a533c6-5979-4c20-b2d0-8da6c89ebca1","shortId":"TfTuU7","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request.","tagline":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request.","description":"This endpoint provides access to portfolio holdings data (portfolio ID 74) through the x402 payment protocol. It is hosted on lowpaymentfee.com, a platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, and infrastructure utilities—all settled via USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 \"exact\" scheme. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments—callers pay per request.\n\nDocumentation beyond the landing page is sparse; the /docs, /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. No OpenAPI schema, request body specification, or response schema is published. The endpoint is live (returns a valid 402 challenge), but the exact request format and response structure for portfolio holdings are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-holdings","pay-per-request","json-response"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","crypto portfolio","asset allocation","holdings data","x402 finance API","Base USDC API"],"warnings":["No request body schema documented—callers must guess or reverse-engineer the expected POST payload.","No response schema or example response available.","Documentation pages (/docs, /pricing, /README) are non-functional, showing only a wallet-connect prompt.","The specific endpoint path (/portfolios/74/holdings) is not listed on the provider's landing page; it may be an internal or unlisted resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/74/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/74/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, but there is no published documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty wallet-connect prompts. Effectively a stub listing with confirmed 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'/docs':137 '/pricing':139 '/readme':141 '/request':12,24 '0.02':11,23,106 '000':101 '20':100 '402':174 '6':111 '74':35 'Base USDC API' 'accept':74 'access':28 'addit':153 'ai/ml':58 'amount':97 'analyt':57 'api':54,116 'asset allocation' 'base':8,20,70,102 'beyond':130 'bodi':160 'caller':125 'challeng':175 'commit':124 'connect':149 'crypto portfolio' 'data':3,15,32,56 'decim':112 'detail':155 'document':129 'endpoint':26,73,168 'exact':93,178 'financ':60 'format':180 'handl':82 'header':89 'hold':2,14,31,186 'holdings data' 'host':43 'id':34 'infer':59 'infrastructur':62 'inlin':83 'investment holdings' 'json':79 'json-response' 'key':117 'land':132 'limit':120 'live':170 'lowpaymentfee.com':45 'maximum':96 'micropay':6,18 'network':9,21,71 'offer':48 'openapi':157 'page':133,142 'pay':51,126 'pay-per-request':50 'payment':39,80,88 'per':52,127 'platform':47 'portfolio':1,13,30,33,185 'portfolio holdings API' 'portfolio-holdings' 'post':75 'prompt':150 'protocol':40 'provid':27 'publish':166 'rate':119 'request':53,76,128,159,179 'requir':98 'resolv':144 'respons':163,182 'return':78,171 'schema':158,164 'scheme':94 'settl':65 'sinc':108 'span':55 'spars':135 'specif':161 'structur':183 'subscript':123 'technic':154 'undocu':188 'unit':103 'usd':107 'usdc':67,105,109 'usdc-base-network' 'use':90,110 'util':63 'valid':173 'various':49 'via':4,16,66,84 'wallet':148 'wallet-connect':147 'x':87 'x-payment':86 'x402':5,17,38,92 'x402 finance API' 'x402-payment'","prices":[{"id":"2c47c98f-c1e8-4e28-8bd5-40781ce48e88","listingId":"08a533c6-5979-4c20-b2d0-8da6c89ebca1","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/74/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":"2026-04-18T18:53:12.763Z"}],"sources":[{"listingId":"08a533c6-5979-4c20-b2d0-8da6c89ebca1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/74/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:12.763Z","lastSeenAt":"2026-04-28T05:34:37.797Z"}],"details":{"listingId":"08a533c6-5979-4c20-b2d0-8da6c89ebca1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/74/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":"Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/74/holdings"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/74/holdings"}],"useCases":["Retrieve holdings for a specific portfolio on demand","Integrate portfolio data into trading bots or dashboards","Agent-driven portfolio monitoring without API key management"],"bestFor":["Developers needing quick, keyless access to portfolio holdings data","AI agents that can settle x402 payments autonomously","Low-volume consumers who prefer pay-per-call over subscriptions"],"notFor":["High-frequency bulk data retrieval (no documented batch endpoint)","Users who need detailed API documentation or SDKs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.009Z"},"updatedAt":"2026-04-28T05:34:37.797Z"}}