{"id":"89d92cd5-6a9f-431b-ac14-2c67fd4cfe8a","shortId":"ngxTnu","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 62. It is part of a broader platform offering various paid API endpoints across data analytics, AI/ML, finance, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each request is independently paid.\n\nThe specific endpoint path (`/api/v1/portfolios/62/holdings`) suggests it returns the current holdings of a particular portfolio (ID 62). However, no documentation beyond the landing page is available — the docs, API, pricing, and README pages all resolve to a wallet-connect 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 is confirmed live (returns a valid 402 challenge).","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","micropayment","pay-per-request","json-api"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto micropayment API","Base USDC API","lowpaymentfee"],"warnings":["No API documentation available — all doc pages return only a wallet-connect prompt","No request body schema or response schema provided","Endpoint is hardcoded to portfolio ID 62; unclear if other portfolio IDs are accessible","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/62/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/62/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 and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — docs pages all resolve to a wallet-connect stub. The purpose of this specific endpoint (portfolio 62 holdings) is only inferable from the URL 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'0.02':10,22,112 '000':107 '20':106 '402':215 '6':117 '62':36,152 'Base USDC API' 'accept':71 'across':49 'ai/ml':52 'amount':101 'analyt':51 'api':47,122,164 'avail':161 'base':8,20,65,98,108 'beyond':156 'bodi':202 'broader':42 'call':104 'caller':85 'categori':56 'challeng':216 'commit':130 'confirm':210 'connect':175 'contain':198 'content':180 'crypto micropayment API' 'current':145 'data':3,15,32,50 'decim':118 'descript':191 'doc':163 'document':155 'endpoint':26,48,70,138,208 'exampl':188 'expect':206 'field':194 'financ':53 'handl':79 'header':91 'hold':2,14,31,146,196 'howev':153 'id':35,151 'includ':86 'independ':134 'infrastructur':55 'inlin':80 'investment holdings' 'json':76 'json-api' 'key':123 'land':158 'limit':126 'live':211 'lowpaymentfee' 'lowpaymentfee.com':28 'maximum':100 'micropay':6,18 'micropayment' 'network':9,21,66 'offer':44 'openapi':184 'page':159,168 'paid':46,135 'part':39 'particular':149 'path':139 'pay-per-request' 'payment':77,90,96 'per':11,23,103 'platform':43 'portfolio':1,13,30,34,150 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':72,201 'price':165 'prompt':176 'protocol':62,84 'rate':125 'readm':167 'request':12,24,73,132 'request/response':187 'requir':102 'resolv':170 'respons':197 'return':29,75,143,212 'schema':185 'settl':58 'sign':94 'sinc':114 'specif':137 'subscript':129 'substant':179 'suggest':141 'unit':109 'usd':113 'usdc':68,95,111,115 'usdc-base' 'use':67,116 'valid':214 'various':45 'via':4,16,59,81 'wallet':174 'wallet-connect':173 'x':89 'x-payment':88 'x402':5,17,61,83 'x402 finance API' 'x402-payment'","prices":[{"id":"cac80299-1b7a-46ca-9ea3-7b4737f98f3a","listingId":"89d92cd5-6a9f-431b-ac14-2c67fd4cfe8a","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/62/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":"2026-04-18T18:53:07.919Z"}],"sources":[{"listingId":"89d92cd5-6a9f-431b-ac14-2c67fd4cfe8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/62/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:07.919Z","lastSeenAt":"2026-04-27T20:08:58.295Z"}],"details":{"listingId":"89d92cd5-6a9f-431b-ac14-2c67fd4cfe8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/62/holdings \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 on Base (0.02 USD per request)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/62/holdings"},{"claim":"The platform advertises $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 on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/62/holdings"}],"useCases":["Retrieving current holdings for a specific portfolio","Integrating portfolio data into dashboards or trading bots","Agent-driven portfolio monitoring with per-request payment"],"bestFor":["Agents needing on-demand portfolio holdings without API key management","Developers who want pay-per-call access to portfolio data on Base","Automated workflows that need frictionless micropayment-gated data"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","Bulk data retrieval where per-request costs would accumulate significantly","Anyone requiring holdings for arbitrary portfolio IDs (this endpoint is fixed to portfolio 62)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.248Z"},"updatedAt":"2026-04-27T20:08:58.295Z"}}