{"id":"d52699eb-bdcc-451b-890f-f046b1082975","shortId":"j8G5Xz","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 at lowpaymentfee.com returns portfolio holdings data for a specific portfolio (portfolio ID 2) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per call. This particular endpoint falls under the finance category and serves portfolio holdings information. No API keys or rate limits are advertised; access is instant upon payment via the x402 protocol.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render 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 is confirmed live (returns a valid 402 challenge), but the actual data contract is unknown.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base-network","micropayment","json-api","post-method"],"categories":["finance"],"synonyms":["portfolio data","holdings API","investment holdings","portfolio positions","asset allocation","crypto portfolio","x402 finance API"],"warnings":["No API documentation available — docs/pricing/README pages only show 'Connect wallet'","No request body schema or response schema documented","Endpoint is hardcoded to portfolio ID 2; unclear if other portfolio IDs are available","Unknown what data source backs the holdings information","No OpenAPI or machine-readable schema provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/2/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/2/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 zero documentation on request parameters, response schema, or what 'portfolio 2' represents. No OpenAPI spec, no examples, and all doc pages are empty wallet-connect 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'0.02':11,23,68,104 '000':74 '0x8335':62 '2':39 '20':73 '2913':63 '402':192 '6':78 'accept':46,183 'access':128 'actual':196 'advertis':127 'ai/ml':95 'analyt':94 'api':91,121,144 'asset allocation' 'base':8,20,57,75 'behind':40 'bodi':182 'broad':85 'call':106 'catalog':86 'categori':114 'challeng':193 'confirm':187 'connect':152 'contain':176 'content':158 'contract':61,198 'cost':66 'crypto portfolio' 'data':3,15,32,93,197 'decim':79 'descript':169 'doc':142 'document':137 'endpoint':26,45,109,185 'exampl':166 'extrem':139 'fall':110 'field':172 'financ':113 'finance/web3':97 'gate':90 'hold':2,14,31,118,174 'holdings API' 'host':83 'id':38 'infer':96 'inform':119 'infrastructur':99 'instant':130 'investment holdings' 'json':51 'json-api' 'key':122 'limit':125 'live':188 'lowpaymentfee.com':28,82 'maxamountrequir':71 'micropay':6,18 'micropayment' 'network':9,21,58 'openapi':162 'page':147 'paramet':179 'particular':108 'payment':52,132 'paywal':43 'per':69,105 'portfolio':1,13,30,36,37,117 'portfolio data' 'portfolio positions' 'portfolio-holdings' 'post':47,181 'post-method' 'price':102,143 'prompt':154 'protocol':136 'provid':81 'rate':124 'readm':146 'render':149 'request':48,70 'request/response':165 'respons':175 'return':29,50,189 'schema':163 'serv':116 'settl':54 'span':92 'spars':140 'specif':35 'substant':157 'unit':76 'unknown':200 'upon':131 'usdc':60 'usdc-base-network' 'use':59 'util':100 'valid':191 'via':4,16,133 'wallet':153 'x402':5,17,42,89,135 'x402 finance API' 'x402-gated':88 'x402-payment'","prices":[{"id":"ee91cdfa-97d1-4658-92e3-236aa85dcc0d","listingId":"d52699eb-bdcc-451b-890f-f046b1082975","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/2/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":"2026-04-18T18:52:35.713Z"}],"sources":[{"listingId":"d52699eb-bdcc-451b-890f-f046b1082975","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/2/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:35.713Z","lastSeenAt":"2026-04-28T14:35:21.578Z"}],"details":{"listingId":"d52699eb-bdcc-451b-890f-f046b1082975","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/2/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 402 with x402 challenge, maxAmountRequired 20000 USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/2/holdings"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/2/holdings"}],"useCases":["Retrieving current holdings for a tracked portfolio","Programmatic portfolio monitoring by AI agents","Integrating portfolio data into dashboards or trading bots"],"bestFor":["Agents needing on-demand portfolio holdings without API key management","Micropayment-based access to financial data on Base network","Developers experimenting with x402 protocol payments"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","High-frequency polling where per-request costs accumulate quickly","Anyone requiring holdings for arbitrary portfolio IDs (this endpoint is fixed to portfolio 2)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.798Z"},"updatedAt":"2026-04-28T14:35:21.578Z"}}