{"id":"249b1618-ea61-4e6a-9c6d-78f2deca1848","shortId":"sHscLm","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 29. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/29/holdings` accepts POST requests and is gated by an x402 payment challenge. The maximum amount required per call is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the `exact` scheme to the specified payTo address, with a 300-second timeout window. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nDocumentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual data returned after payment is unknown. The endpoint appears to be one of many on the platform, all priced at $0.02 per request.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","micropayment"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto micropayment API","Base USDC API","portfolio data endpoint","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No request body schema or response schema provided; actual data returned after payment is unknown","The endpoint references a specific portfolio ID (29) with no explanation of what portfolio this represents","No OpenAPI or machine-readable spec discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/29/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/29/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 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 no examples. The purpose of 'portfolio 29 holdings' is opaque — it's unclear whether this returns real financial data or demo/placeholder 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'0.02':11,24,105,222 '000':94 '0x8335':99 '20':93 '29':37 '2913':100 '300':125 '402':193 '6':109 'Base USDC API' 'accept':75 'access':137 'across':51 'actual':201 'addit':170 'address':122 'advertis':136 'ai/ml':54 'amount':88 'analyt':53 'api':50,130,156 'appear':210 'avail':185 'base':9,22,67,95,102 'beyond':147 'broader':43 'call':91 'categori':58 'challeng':85,198 'confirm':189 'connect':165 'crypto micropayment API' 'data':4,17,33,52,202 'decim':110 'detail':172 'doc':155 'document':146 'endpoint':28,73,187,209 'equal':104 'exact':116 'exampl':183 'extrem':152 'financ':55 'gate':80 'grant':139 'hold':3,16,32 'http':192 'id':36 'infrastructur':57 'investment holdings' 'key':131 'land':149 'limit':134 'live':190 'lowpaymentfee' 'lowpaymentfee.com':30 'made':113 'mani':215 'maximum':87 'micropay':7,20,145 'micropayment' 'network':68 'no-api-key' 'offer':45 'one':213 'openapi':176 'page':150,160 'part':40 'pay':47 'pay-per-request':46 'payload':184 'payment':84,111,205 'payto':121 'per':12,25,48,90,143,223 'per-request':142 'platform':44,218 'portfolio':2,15,35 'portfolio data endpoint' 'portfolio holdings API' 'portfolio-holdings' 'post':76 'price':157,220 'prompt':167 'protocol':64 'pure':140 'rate':133 'readm':159 'render':162 'request':13,26,49,77,144,224 'request/response':179 'requir':89 'retriev':1,14 'return':31,191,203 'schema':180 'scheme':117 'second':126 'settl':60 'spars':153 'spec':177 'specif':72 'specifi':120 'technic':171 'timeout':127 'unit':96 'unknown':207 'usd':106 'usdc':70,98,107 'usdc-base' 'use':69,108 'valid':196 'via':5,18,61,114 'wallet':166 'window':128 'x402':6,19,63,83,197 'x402 finance API' 'x402-payment'","prices":[{"id":"99c5e51c-8753-469d-b8e5-67e445802dfa","listingId":"249b1618-ea61-4e6a-9c6d-78f2deca1848","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/29/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":"2026-04-18T18:52:32.708Z"}],"sources":[{"listingId":"249b1618-ea61-4e6a-9c6d-78f2deca1848","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/29/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:32.708Z","lastSeenAt":"2026-04-28T03:33:43.531Z"}],"details":{"listingId":"249b1618-ea61-4e6a-9c6d-78f2deca1848","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/29/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 HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/29/holdings"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/29/holdings"}],"useCases":["Fetching portfolio holdings data without needing API key registration","Programmatic access to portfolio composition for automated trading or analytics","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Agents or apps that need on-demand portfolio holdings data with no subscription commitment","Developers experimenting with x402 pay-per-request patterns on Base","Low-volume consumers who prefer micropayments over monthly API plans"],"notFor":["High-frequency bulk data consumers who need sub-cent pricing per call","Users who need detailed API documentation or response schema guarantees before integrating","Anyone requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.916Z"},"updatedAt":"2026-04-28T03:33:43.531Z"}}