{"id":"18359100-a567-425e-81e4-8a9eb2f78d7e","shortId":"KQpBY2","kind":"x402","title":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (portfolio ID 76) via the x402 payment protocol. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request and settle on the Base network using USDC.\n\nThe specific portfolio endpoint (/api/v1/portfolios/76) does not have detailed documentation available — the docs, pricing, and API pages on the site only render a \"Connect wallet\" prompt with no further content. The response schema, input parameters, and exact data returned by this endpoint are unknown. The endpoint accepts POST requests and returns application/json content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-data","per-request-pricing","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no content.","No input or output schema documented for this specific endpoint; the data returned is unknown.","The portfolio ID (76) is hardcoded in the URL with no explanation of what portfolio it represents.","Cannot verify what data is actually returned without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/76","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","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 challenge, but there is no documentation, no OpenAPI schema, no example request/response, and no description of what portfolio data is actually returned. The docs pages are empty (wallet-connect only). This is effectively a stub 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'0.02':10,24,69,145 '000':71 '20':70 '402 payment endpoint' '6':77 '76':42 'Base network API' 'USDC API' 'accept':202 'access':34 'ai/ml':116 'analysi':119 'analyt':115 'api':80,112,171 'application/json':207 'attach':89 'avail':166 'base':8,22,64,72,152 'base-network' 'broad':106 'caller':87 'catalog':107 'challeng':57 'classif':121 'connect':179 'content':185,208 'convers':138 'cost':68 'crypto-paid API' 'data':5,19,114,193 'decim':78 'detail':164 'doc':168 'document':165 'embed':122 'endpoint':6,20,30,49,141,159,197,201 'estim':132 'exact':192 'exchang':127 'feed':126 'financ':123 'gas':131 'gate':3,17,111 'generat':139 'geocod':136 'header':94 'host':101 'id':41 'infer':117 'infrastructur':134 'input':189 'json-response' 'key':81 'limit':84 'list':143 'live':51 'lowpaymentfee' 'lowpaymentfee.com':32,103 'network':65,153 'no-api-key' 'offer':104 'page':172 'paramet':190 'pay':9,23 'pay-per-call API' 'payment':46,59,93,98 'per':11,25,146 'per-request-pricing' 'portfolio':4,18,38,40,158 'portfolio API' 'portfolio-data' 'post':203 'price':125,169 'prompt':181 'proof':99 'protocol':47 'provid':33 'quot':130 'rate':83,128 'render':177 'request':12,26,67,147,204 'requir':58,86 'resourc':39 'respons':187 'return':53,194,206 'schema':188 'sentiment':118 'settl':149 'simpli':88 'site':102,175 'span':113 'specif':37,157 'standard':55 'summar':120 'token':129 'unit':73 'unknown':199 'usdc':14,28,61,75,155 'usdc-settlement' 'use':154 'util':135 'valid':97,137 'via':43 'wallet':180 'web3':124 'x':92 'x-payment':91 'x402':2,16,45,56,110 'x402 portfolio' 'x402-gated':1,15,109 'x402-payment'","prices":[{"id":"938292e3-f846-41ed-be05-4274bcfbfe89","listingId":"18359100-a567-425e-81e4-8a9eb2f78d7e","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:32.071Z"}],"sources":[{"listingId":"18359100-a567-425e-81e4-8a9eb2f78d7e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:32.071Z","lastSeenAt":"2026-04-27T15:34:26.185Z"}],"details":{"listingId":"18359100-a567-425e-81e4-8a9eb2f78d7e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/76 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/76"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/76"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving portfolio data (ID 76) with per-request micropayment in USDC","Integrating pay-per-call portfolio access into an AI agent workflow","Accessing financial portfolio information without API key registration"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","Users already holding USDC on Base who need portfolio data","Prototyping x402 payment flows against a live endpoint"],"notFor":["Users needing detailed documentation or guaranteed SLAs","Bulk data retrieval where per-request pricing becomes expensive","Anyone without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.057Z"},"updatedAt":"2026-04-27T15:34:26.185Z"}}