{"id":"68268d09-3bc0-4d81-bcea-f64306139ced","shortId":"GnSyeH","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 returns portfolio holdings data for a specific portfolio (ID 15) via a POST request. It uses the x402 payment protocol on the Base network, accepting USDC (contract 0x8335…2913) with a maximum charge of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. The specific endpoint listed here falls under the finance/Web3 category and serves portfolio holdings information.\n\nDocumentation is extremely sparse. The crawled 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 parameters the POST body accepts. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is difficult to know exactly what data is returned or what input is expected.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-holdings","pay-per-call","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","crypto portfolio","holdings endpoint","x402 finance API","pay-per-call portfolio"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request parameters or response format","Endpoint is hardcoded to portfolio ID 15; unclear if other portfolio IDs are available","No example request or response bodies could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/15/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/15/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The purpose (portfolio holdings) is only inferable from the URL path; actual input parameters and response shape are 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'0.02':16,33,73,136 '000':77 '0x8335':66 '15':48 '20':76 '2913':67 '402':210 '6':81 'accept':63,201 'ai/ml':126 'analyt':125 'api':7,24,84,122,161 'attach':93 'base':9,26,61,78 'base-network' 'bodi':200 'broader':111 'call':4,21,121 'caller':91 'categori':148 'challeng':212 'charg':71 'confirm':205 'connect':170 'contain':194 'content':176 'contract':65 'crawl':159 'crypto portfolio' 'data':42,124,129,223 'decim':82 'descript':187 'difficult':218 'doc':160 'document':154,215 'dozen':116 'endpoint':36,106,141,203 'exact':221 'exampl':184 'expect':230 'extrem':156 'fall':144 'field':190 'finance/web3':128,147 'header':98 'hold':6,23,41,152,192 'holdings endpoint' 'id':47 'infer':127 'inform':153 'input':228 'investment holdings' 'key':85 'know':220 'limit':88 'list':142 'live':206 'lowpaymentfee.com':38,113 'maximum':70 'network':62 'no-api-key' 'offer':115 'openapi':180 'page':165 'paramet':197 'part':108 'pay':2,19,119 'pay-per-cal':1,18,118 'pay-per-call' 'pay-per-call portfolio' 'payment':57,97,103 'per':3,20,74,120,137 'platform':112 'portfolio':5,22,40,46,151 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':51,199 'post-endpoint' 'price':134,162 'prompt':172 'proof':104 'proper':209 'protocol':58 'rate':87 'readm':164 'request':52,75,138 'request/response':183 'requir':90 'respons':193 'return':39,167,207,225 'schema':181 'serv':150 'servic':132 'settl':12,29 'simpli':92 'span':123 'spars':157 'specif':45,140 'unit':79 'usdc':14,31,64 'usdc-settlement' 'use':54 'util':131 'valid':101 'via':10,27,49 'wallet':171 'without':214 'x':96 'x-payment':95 'x402':11,28,56,102,211 'x402 finance API' 'x402-payment'","prices":[{"id":"6a227012-23db-4f57-9e85-bd85e3c41c67","listingId":"68268d09-3bc0-4d81-bcea-f64306139ced","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/15/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":"2026-04-18T18:52:19.410Z"}],"sources":[{"listingId":"68268d09-3bc0-4d81-bcea-f64306139ced","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/15/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:19.410Z","lastSeenAt":"2026-04-28T05:34:35.070Z"}],"details":{"listingId":"68268d09-3bc0-4d81-bcea-f64306139ced","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/15/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/15/holdings"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/15/holdings"}],"useCases":["Retrieving current holdings for a specific investment portfolio","Integrating portfolio data into dashboards or trading bots","Automated portfolio monitoring by AI agents paying per request"],"bestFor":["Agents needing on-demand portfolio holdings without subscription commitments","Developers who want keyless, pay-per-call access to financial data","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or schema before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing holdings for arbitrary portfolio IDs (this endpoint is fixed to portfolio 15)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.6Z"},"updatedAt":"2026-04-28T05:34:35.070Z"}}