{"id":"83a5984f-0b5a-4eef-abb6-189b3fcebe57","shortId":"erALAM","kind":"x402","title":"Pay-per-call portfolio holdings API on Base, settled in USDC via x402.","tagline":"Pay-per-call portfolio holdings API on Base, settled in USDC via x402.","description":"This endpoint at lowpaymentfee.com exposes portfolio holdings data at `/api/v1/portfolios/43/holdings`. It is part of a broader platform offering data & analytics, AI/ML, finance/Web3, and infrastructure APIs, all payable per-request via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint returns holdings information for portfolio ID 43. Payment is handled inline: callers attach an X-PAYMENT header with a valid x402 payment proof. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains. The endpoint accepts POST requests based on the outputSchema in the x402 challenge. Without documentation or sample payloads, the exact request body format and response structure remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-holdings","per-request-pricing","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","USDC micropayment API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","The specific resource (portfolio 43) is unexplained; unclear if other portfolio IDs are accessible","Response content and data freshness are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/43/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/43/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of 'portfolio 43 holdings' is opaque without further 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'/request':128 '0.02':116,127 '000':105 '0x8335':110 '20':104 '2913':111 '43':78 '6':121 'USDC micropayment API' 'accept':186 'across':130 'addit':164 'advertis':99,125 'ai/ml':49 'analyt':48 'api':7,21,53,135,150 'attach':84 'base':9,23,65,106,113,189 'base-network' 'bodi':205 'broader':44 'call':4,18 'caller':83 'challeng':98,196 'commit':143 'connect':159 'contain':183 'content':165 'cost':102 'crypto portfolio' 'data':36,47 'decim':122 'descript':176 'doc':149 'document':144,198 'endpoint':30,71,132,185 'equal':115 'exact':203 'exampl':173 'expos':33 'extrem':146 'field':179 'finance/web3':50 'format':206 'handl':81 'header':89 'hold':6,20,35,73,181 'id':77 'inform':74 'infrastructur':52 'inlin':82 'investment holdings' 'key':136 'limit':139 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':101 'minimum':142 'network':66 'no-api-key' 'offer':46 'openapi':169 'outputschema':192 'page':154 'part':41 'pay':2,16 'pay-per-cal':1,15 'payabl':55 'payload':201 'payment':79,88,94 'per':3,17,57,117 'per-request':56 'per-request-pricing' 'platform':45,124 'portfolio':5,19,34,76 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':187 'price':129,151 'prompt':161 'proof':95 'protocol':62 'rate':138 'readm':153 'remain':210 'render':156 'request':58,118,188,204 'request/response':172 'respons':182,208 'return':72 'sampl':200 'schema':170 'settl':10,24 'spars':147 'specif':70 'structur':209 'uniform':126 'unit':107 'unknown':211 'usdc':12,26,68,109,119 'usdc-settlement' 'use':67,120 'valid':92 'via':13,27,59 'wallet':160 'without':197 'x':87 'x-payment':86 'x402':14,28,61,93,97,195 'x402 finance API' 'x402-payment'","prices":[{"id":"5649e460-7978-406e-9f55-54ef69498d68","listingId":"83a5984f-0b5a-4eef-abb6-189b3fcebe57","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/43/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":"2026-04-18T18:52:54.273Z"}],"sources":[{"listingId":"83a5984f-0b5a-4eef-abb6-189b3fcebe57","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/43/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:54.273Z","lastSeenAt":"2026-04-27T22:33:21.169Z"}],"details":{"listingId":"83a5984f-0b5a-4eef-abb6-189b3fcebe57","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/43/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":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/43/holdings"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/43/holdings"}],"useCases":["Retrieving holdings data for a specific portfolio via a single paid API call","Integrating portfolio data into agent workflows without API key management","Programmatic access to portfolio composition data settled on Base L2"],"bestFor":["Agents needing on-demand portfolio holdings without subscription commitments","Developers experimenting with x402 pay-per-call patterns","Lightweight integrations where API key management is undesirable"],"notFor":["Users needing detailed API documentation or response schema guarantees","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring holdings for arbitrary portfolio IDs (only portfolio 43 is confirmed)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.896Z"},"updatedAt":"2026-04-27T22:33:21.169Z"}}