{"id":"7933ef01-edcc-4f16-a3b4-c3354dbd81cb","shortId":"zk8DgH","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 provides access to portfolio holdings data (portfolio ID 87) through the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required; access is gated purely by the x402 micropayment.\n\nThe provider site (lowpaymentfee.com) hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, this specific endpoint targets portfolio holdings retrieval. The exact schema of the POST request body and the response payload are not documented in the crawled material — the docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no further detail.\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation beyond the landing page listing, the actual fields accepted and returned by this endpoint remain unknown. Agents should expect a JSON response (mimeType: application/json) but will need to experiment or obtain additional documentation to understand the input and output structure.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","Base USDC micropayment API","lowpaymentfee portfolio"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Docs, pricing, and API pages all render only a 'Connect wallet' prompt with no technical content","The endpoint is for a specific portfolio ID (87); unclear if other portfolio IDs are available or how they are discovered","The provider site lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/87/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/87/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and no meaningful documentation beyond a landing page. The specific purpose of 'portfolio 87 holdings' is opaque without further 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'000':66 '20':65 '6':70 '87':37 'Base USDC micropayment API' 'accept':44,184 'access':30,81 'actual':182 'addit':207 'agent':192 'ai/ml':106 'analyt':105 'api':74,102,150 'application/json':199 'base':8,20,57,67 'beyond':176 'bodi':134 'broader':95 'call':62,101 'catalog':96 'connect':157 'crawl':144 'data':3,15,34,104,109 'decim':71 'detail':163 'doc':147 'document':141,175,208 'endpoint':26,122,189 'exact':128 'exampl':172 'expect':194 'experi':204 'field':183 'finance/web3':108 'gate':83 'hold':2,14,33,125 'host':93 'howev':119 'id':36 'infer':107 'input':212 'investment holdings' 'json':49,196 'json-response' 'key':75 'land':178 'limit':78 'list':180 'lowpaymentfee portfolio' 'lowpaymentfee.com':28,92 'materi':145 'maxamountrequir':63 'micropay':6,18,88 'mimetyp':198 'minim':156 'need':202 'network':9,21,58 'no-api-key' 'obtain':206 'openapi':168 'output':214 'page':151,179 'pay':99 'pay-per-cal':98 'pay-per-request' 'payload':138 'payment':41,50 'per':11,23,61,100,117 'portfolio':1,13,32,35,124 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':45,132 'price':114,148 'prompt':159 'protocol':42 'provid':29,90 'pure':84 'rate':77 'remain':190 'request':12,24,46,118,133 'request/response':171 'requir':80 'resolv':153 'respons':137,197 'retriev':126 'return':48,186 'schema':129 'servic':112 'settl':52 'site':91 'span':103 'spec':169 'specif':121 'structur':215 'target':123 'understand':210 'unit':68 'unknown':191 'usdc':54 'usdc-base' 'util':111 'via':4,16 'wallet':158 'x402':5,17,40,87 'x402 finance API' 'x402-payment'","prices":[{"id":"eeafd423-2538-44e4-a562-cf0dd75d3574","listingId":"7933ef01-edcc-4f16-a3b4-c3354dbd81cb","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/87/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":"2026-04-18T18:53:30.289Z"}],"sources":[{"listingId":"7933ef01-edcc-4f16-a3b4-c3354dbd81cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/87/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:30.289Z","lastSeenAt":"2026-04-27T15:34:26.142Z"}],"details":{"listingId":"7933ef01-edcc-4f16-a3b4-c3354dbd81cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/87/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":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/87/holdings"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/87/holdings"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages resolve to minimal 'Connect wallet' content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving holdings for a specific portfolio programmatically","Integrating portfolio data into trading bots or dashboards","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Agents needing on-demand portfolio holdings without subscription commitments","Developers who want keyless, pay-per-use access to financial data","Crypto-native workflows settling payments on Base L2"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume bulk data retrieval where per-call pricing adds up","Non-crypto users who cannot pay with USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.14Z"},"updatedAt":"2026-04-27T15:34:26.142Z"}}