{"id":"30ca658e-584f-498e-93bd-e69782982292","shortId":"x6nb7T","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 (portfolio ID 23) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider site lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This specific endpoint falls under the finance/portfolio category. The x402 challenge was successfully captured (HTTP 402 with valid accepts payload), confirming the endpoint is live.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains or what POST body (if any) is expected. The endpoint is functional from a payment-protocol standpoint, but consumers should expect to experiment with request payloads to discover the actual data contract.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-holdings","pay-per-call","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto portfolio data","USDC micropayment API","Base network API","pay-per-request holdings"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a wallet-connect prompt with no content.","No OpenAPI or JSON schema describing request body or response format for this endpoint.","The specific portfolio ID (23) is hardcoded in the URL; it is unclear whether other portfolio IDs are available or what they represent.","Response structure is entirely unknown — consumers must discover the data contract experimentally."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/23/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/23/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/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The actual data contract for this holdings endpoint is completely 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'0.02':16,33,83,117 '000':78 '0x8335':70 '20':77 '23':47 '2913':71 '402':145 '6':88 'Base network API' 'USDC micropayment API' 'accept':54,148 'access':40 'actual':225 'ai/ml':107 'analyt':106 'api':7,24,103,122,161 'base':9,26,65,79 'base-network' 'bodi':198 'broad':96 'call':4,21,102 'captur':143 'catalog':97 'categori':137 'challeng':140 'commit':129 'confirm':150 'connect':170 'consum':214 'contain':194 'content':176 'contract':69,227 'cost':75 'crypto portfolio data' 'data':44,105,110,226 'decim':89 'descript':187 'discov':223 'doc':160 'document':155 'endpoint':36,132,152,204 'equal':82 'exampl':184 'expect':202,216 'experi':218 'extrem':157 'fall':133 'field':190 'finance/portfolio':136 'finance/web3':109 'function':206 'hold':6,23,43,192 'host':94 'http':144 'id':46 'infer':108 'infrastructur':112 'investment holdings' 'json':59 'json-response' 'key':123 'limit':126 'live':154 'lowpaymentfee.com':38,93 'maximum':74 'network':66 'no-api-key' 'openapi':180 'page':165 'pay':2,19,100 'pay-per-cal':1,18,99 'pay-per-call' 'pay-per-request holdings' 'payload':149,221 'payment':51,60,210 'payment-protocol':209 'per':3,20,84,101,118 'portfolio':5,22,42,45 'portfolio holdings API' 'portfolio-holdings' 'post':55,197 'price':115,162 'prompt':172 'protocol':52,211 'provid':39,91 'rate':125 'readm':164 'request':56,85,119,220 'request/response':183 'respons':193 'return':58,167 'schema':181 'settl':12,29,62 'site':92 'span':104 'spars':158 'specif':131 'standpoint':212 'success':142 'unit':80 'usdc':14,31,68,86 'usdc-settlement' 'use':67,87 'util':113 'valid':147 'via':10,27,48 'wallet':171 'x402':11,28,50,139 'x402 finance API' 'x402-payment'","prices":[{"id":"cabf3a0d-5538-4093-9c2b-04218826918f","listingId":"30ca658e-584f-498e-93bd-e69782982292","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/23/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":"2026-04-18T18:52:24.281Z"}],"sources":[{"listingId":"30ca658e-584f-498e-93bd-e69782982292","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/23/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:24.281Z","lastSeenAt":"2026-04-28T05:04:34.688Z"}],"details":{"listingId":"30ca658e-584f-498e-93bd-e69782982292","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/23/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":"The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/23/holdings"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/23/holdings"}],"useCases":["Retrieving portfolio holdings data for a specific portfolio without needing an API key","Integrating portfolio data into agent workflows that can settle payments via x402","Building dashboards or analytics on top of portfolio composition data"],"bestFor":["Agents or apps that can pay per-call via x402 on Base","Users who want keyless, instant access to portfolio data","Micropayment-friendly integrations needing low per-request costs"],"notFor":["Users who need detailed API documentation or guaranteed response schemas before integrating","High-volume batch consumers who need bulk pricing or subscription plans","Anyone unable to settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.313Z"},"updatedAt":"2026-04-28T05:04:34.688Z"}}