{"id":"c2ea7130-7b5e-4be6-a277-bb1863a48024","shortId":"FzKUSz","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 76. It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request.\n\nThe specific endpoint `/api/v1/portfolios/76/holdings` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD given 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned 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 POST body (if any) is expected. The endpoint's purpose — returning holdings for a specific portfolio — is inferred solely from the URL path and the generic \"Premium API Access\" description.","tags":[],"capabilities":["portfolio-holdings","x402-payment","usdc-micropayment","base-network","pay-per-request","json-api"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","crypto portfolio","holdings endpoint","x402 finance API","micropayment API"],"warnings":["No OpenAPI schema or request/response documentation available","All doc/pricing/README pages return only 'Connect wallet' with no content","Endpoint is specific to portfolio ID 76; unclear if other portfolio IDs are supported","POST body requirements are unknown — no input schema provided","Response format and fields are completely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/76/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/76/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the purpose of the endpoint is only inferable from the URL path. Effectively a stub 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'0.02':10,22,78,109 '000':104 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':119 '20':103 '6':112 '76':36 'accept':85 'access':128,205 'address':118 'advertis':127 'ai/ml':54 'analyt':53 'api':50,121,141,204 'base':8,20,75,105 'base-network' 'bodi':178 'broader':42 'call':49,115 'challeng':93 'confirm':94 'connect':150 'contain':174 'content':156 'crawl':139 'crypto portfolio' 'data':3,15,32,52 'decim':113 'descript':167,206 'doc':140 'document':134 'endpoint':26,61,83,96,184 'exampl':164 'expect':182 'extrem':136 'field':170 'finance/web3':56 'gate':130 'generic':202 'given':111 'hold':2,14,31,172,188 'holdings endpoint' 'id':35 'infer':55,194 'infrastructur':58 'investment holdings' 'json':90 'json-api' 'key':122 'limit':125 'live':98 'lowpaymentfee.com':28 'maximum':101 'micropay':6,18,133 'micropayment API' 'network':9,21,76 'offer':44 'openapi':160 'page':145 'paid':116 'part':39 'path':199 'pay':47 'pay-per-cal':46 'pay-per-request' 'payment':68 'per':11,23,48,79,114 'platform':43,64 'portfolio':1,13,30,34,192 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':86,177 'premium':203 'price':142 'prompt':152 'protocol':69 'pure':131 'purpos':186 'rate':124 'readm':144 'request':12,24,80,87 'request/response':163 'requir':99 'respons':173 'return':29,89,147,187 'schema':161 'settl':70 'sole':195 'span':51 'spars':137 'specif':82,191 'substant':155 'unit':106 'url':198 'usd':110 'usdc':72,108 'usdc-micropayment' 'use':65 'util':59 'various':45 'via':4,16 'wallet':151 'x402':5,17,67,92 'x402 finance API' 'x402-payment'","prices":[{"id":"d8c39536-1610-40f2-b89f-9e7da6593d19","listingId":"c2ea7130-7b5e-4be6-a277-bb1863a48024","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/76/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":"2026-04-18T18:53:33.277Z"}],"sources":[{"listingId":"c2ea7130-7b5e-4be6-a277-bb1863a48024","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/76/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:33.277Z","lastSeenAt":"2026-04-27T15:34:26.238Z"}],"details":{"listingId":"c2ea7130-7b5e-4be6-a277-bb1863a48024","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/76/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":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/76/holdings"},{"claim":"The 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/76/holdings"}],"useCases":["Retrieve holdings data for portfolio 76 programmatically with per-call payment","Integrate portfolio data into trading bots or dashboards without API key management","Agent-driven portfolio monitoring using x402 micropayments"],"bestFor":["Agents or apps needing on-demand portfolio holdings without subscription commitments","Developers experimenting with x402 pay-per-call protocols","Low-volume consumers who want to avoid API key registration"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing holdings for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 76)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.026Z"},"updatedAt":"2026-04-27T15:34:26.238Z"}}