{"id":"2e5249c3-8400-4a45-b51c-393163be4a57","shortId":"faTFwj","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 83. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/83/holdings` accepts POST requests and is priced at a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is settled on-chain via the x402 \"exact\" scheme, meaning the caller includes an X-PAYMENT header with a signed payment proof. No API keys, rate limits, or upfront commitments are required — access is instant once payment is attached.\n\nDocumentation on the site is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data format of portfolio holdings is unknown. Callers should expect a JSON response (mimeType is application/json) but will need to experiment or contact the provider for field-level documentation.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","lowpaymentfee","Base USDC API","pay-per-call portfolio"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No request body schema or response schema provided; callers must guess the payload format","Endpoint is hardcoded to portfolio ID 83 with no explanation of what this portfolio represents","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/83/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/83/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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of 'portfolio 83 holdings' is entirely opaque. This is effectively a stub 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'0.02':11,24,105 '000':92 '0x8335':97 '20':91 '2913':98 '402':200 '6':101 '83':37 'Base USDC API' 'accept':81 'access':143 'actual':204 'ai/ml':59 'analyt':58 'api':55,134,159 'application/json':220 'attach':149 'avail':188 'base':9,22,75,93,100 'behind':68 'broader':43 'call':54,107 'caller':121,212 'chain':113 'challeng':201 'commit':140 'confirm':195 'connect':168 'contact':227 'crawl':191 'crypto portfolio' 'data':4,17,33,57,62,205 'decim':102 'detail':175 'doc':158 'document':150,234 'endpoint':28,79,193 'equal':104 'exact':117 'exampl':186 'expect':214 'experi':225 'extrem':155 'field':232 'field-level':231 'finance/web3':61 'format':206 'gate':67 'header':127 'hold':3,16,32,209 'id':36 'includ':122 'infer':60 'infrastructur':64 'instant':145 'investment holdings' 'json':216 'key':135 'level':233 'limit':137 'live':196 'lowpaymentfee' 'lowpaymentfee.com':30,45 'maximum':89 'mean':119 'micropay':7,20 'mimetyp':218 'need':223 'network':76 'no-api-key' 'offer':47 'on-chain':111 'openapi':179 'page':163 'part':40 'pay':52 'pay-per-cal':51 'pay-per-call portfolio' 'pay-per-request' 'payload':187 'payment':71,108,126,131,147 'per':12,25,53,106 'platform':44 'portfolio':2,15,35,208 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':82 'price':86,160 'prompt':170 'proof':132 'proper':199 'protocol':72 'provid':229 'rate':136 'readm':162 'render':165 'request':13,26,83 'request/response':182 'requir':142 'respons':217 'retriev':1,14 'return':31,197 'schema':183 'scheme':118 'settl':110 'sign':130 'site':153 'span':56 'spars':156 'spec':180 'specif':78 'technic':174 'unit':94 'unknown':211 'upfront':139 'usdc':96 'usdc-base' 'util':65 'varieti':49 'via':5,18,114 'wallet':169 'x':125 'x-payment':124 'x402':6,19,70,116 'x402 finance API' 'x402-payment'","prices":[{"id":"5b0d78d7-8e8a-4865-8dc7-2776fe87699a","listingId":"2e5249c3-8400-4a45-b51c-393163be4a57","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/83/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":"2026-04-18T18:53:35.061Z"}],"sources":[{"listingId":"2e5249c3-8400-4a45-b51c-393163be4a57","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/83/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:35.061Z","lastSeenAt":"2026-04-27T22:33:22.947Z"}],"details":{"listingId":"2e5249c3-8400-4a45-b51c-393163be4a57","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/83/holdings \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","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","source_url":"https://lowpaymentfee.com/api/v1/portfolios/83/holdings"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/83/holdings"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current holdings for a specific portfolio via micropayment","Integrating portfolio data into automated trading or analytics pipelines","Agent-driven portfolio monitoring without API key management"],"bestFor":["Agents or bots that need on-demand portfolio holdings without subscription overhead","Developers experimenting with x402 pay-per-call patterns on Base","Low-volume consumers who want instant access without signup"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-frequency bulk data consumers who would benefit from subscription pricing","Anyone requiring holdings for arbitrary portfolio IDs (this endpoint is fixed to portfolio 83)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.91Z"},"updatedAt":"2026-04-27T22:33:22.947Z"}}