{"id":"2d6f4f48-47f3-48a3-8d88-1c1db2b81f35","shortId":"bELn9B","kind":"x402","title":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 95 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required — access is granted per-request upon payment.\n\nThe provider site (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 request. This specific endpoint falls under the finance/portfolio category, though the site does not provide detailed documentation for the holdings endpoint's request or response schema. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no further content.\n\nBecause there is no OpenAPI spec, no request/response schema documentation, and no example payloads available, the exact fields accepted in the POST body and the structure of the returned holdings data are unknown. Agents should expect a JSON response (mimeType is application/json) but will need to experiment or contact the provider for schema details.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","micropayment","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","holdings endpoint","lowpaymentfee"],"warnings":["No request or response schema documented — input/output structure is unknown","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content","Portfolio ID 95 is hardcoded in the endpoint path; unclear if other portfolio IDs are available or how they are obtained","Provider site lists many API categories but this specific holdings endpoint is not listed on the homepage catalog"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/95/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/95/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages returned only 'Connect wallet' with no useful content. The purpose of the holdings endpoint is only inferable from the URL 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'000':61 '20':60 '6':65 '95':37 'accept':174 'access':76 'agent':189 'ai/ml':100 'analyt':99 'api':69,96,141 'application/json':197 'avail':170 'base':9,22,56,62 'bodi':178 'broad':90 'call':49 'catalog':91 'categori':119 'connect':149 'contact':204 'content':155 'cost':50 'crawl':138 'crypto portfolio' 'data':4,17,33,98,186 'decim':66 'detail':126,209 'doc':139 'document':127,165 'endpoint':28,114,131 'exact':172 'exampl':168 'expect':191 'experi':202 'fall':115 'field':173 'finance/portfolio':118 'finance/web3':102 'gate':42,95 'grant':78 'hold':3,16,32,130,185 'holdings endpoint' 'host':88 'id':36 'infer':101 'infrastructur':104 'investment holdings' 'json':193 'json-api' 'key':70 'limit':73 'lowpaymentfee' 'lowpaymentfee.com':30,87 'maxamountrequir':58 'micropay':7,20 'micropayment' 'mimetyp':195 'need':200 'network':57 'no-api-key' 'openapi':160 'page':144 'payload':169 'payment':46,83 'per':12,25,80,110 'per-request':79 'portfolio':2,15,35 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':40,177 'price':107,140 'prompt':151 'protocol':47 'provid':85,125,206 'rate':72 'readm':143 'request':13,26,41,81,111,133 'request/response':163 'requir':75 'respons':135,194 'retriev':1,14 'return':31,146,184 'schema':136,164,208 'site':86,122 'span':97 'spec':161 'specif':113 'structur':181 'though':120 'unit':63 'unknown':188 'upon':82 'usdc':53 'usdc-base' 'util':105 'via':5,18,38 'wallet':150 'x402':6,19,45,94 'x402 finance API' 'x402-gated':93 'x402-payment'","prices":[{"id":"c43fc73e-ff0d-4f8a-b7f7-e06f7eca6d12","listingId":"2d6f4f48-47f3-48a3-8d88-1c1db2b81f35","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/95/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":"2026-04-18T18:53:42.268Z"}],"sources":[{"listingId":"2d6f4f48-47f3-48a3-8d88-1c1db2b81f35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/95/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:42.268Z","lastSeenAt":"2026-04-27T14:05:19.509Z"}],"details":{"listingId":"2d6f4f48-47f3-48a3-8d88-1c1db2b81f35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/95/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 402 with x402 challenge advertising $0.02 USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/95/holdings"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/95/holdings"}],"useCases":["Fetching current holdings for a specific investment portfolio","Integrating portfolio data into dashboards or analytics pipelines","Automated portfolio monitoring by AI agents paying per-request"],"bestFor":["Agents needing on-demand portfolio holdings without API key management","Low-volume or sporadic portfolio data lookups at $0.02 per call","x402-native workflows on the Base network"],"notFor":["High-frequency bulk portfolio data retrieval (no documented batch support)","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-USDC or non-Base payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.592Z"},"updatedAt":"2026-04-27T14:05:19.509Z"}}