{"id":"6977f67f-55b1-4c3b-8e63-ba30d3953587","shortId":"e8KU8M","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 34) via the x402 payment protocol. The endpoint is live and returns a standard x402 challenge requiring payment of 20,000 base units of USDC on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the \"exact\" scheme to the specified wallet address, with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform hosts a variety of pay-per-call API endpoints spanning data & analytics, AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request and settle on the Base network using USDC.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio endpoint actually returns. The endpoint accepts POST requests and serves application/json, but the exact input parameters and output format are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","portfolio-data","json-api","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI or schema documentation available — input parameters and response format are completely unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no useful content","The specific purpose and data returned by /api/v1/portfolios/34 is undocumented","No example requests or responses available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/34","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/34","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, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what portfolio data is actually returned. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'000':62 '20':61 '34':42 '6':78 'Base network API' 'USDC micropayment API' 'accept':202 'access':34 'actual':198 'address':91 'ai':117 'analysi':121 'analyt':116 'api':94,112,166 'application/json':207 'base':8,22,63,69,156 'broader':101 'call':111 'challeng':57 'classif':124 'connect':175 'content':181 'convers':141 'crypto payment API' 'data':5,19,115 'decim':79 'descript':192 'doc':165 'document':160 'embed':125 'endpoint':6,20,30,49,113,144,197,201 'equal':72 'estim':135 'exact':85,210 'exampl':189 'exchang':130 'extrem':162 'feed':129 'financ':126 'format':215 'gas':134 'gate':3,17 'generat':142 'geocod':139 'host':104 'id':41 'infrastructur':137 'input':211 'json-api' 'key':95 'learn':119 'limit':98 'live':51 'lowpaymentfee' 'lowpaymentfee.com':32,102 'machin':118 'made':82 'network':70,157 'no-api-key' 'no-rate-limit' 'openapi':185 'output':214 'page':170 'paramet':212 'pay':9,23,109 'pay-per-cal':108 'pay-per-call API' 'pay-per-request' 'payment':46,59,80 'per':11,25,74,110,150 'platform':103 'portfolio':4,18,38,40,196 'portfolio API' 'portfolio-data' 'post':203 'price':128,147,167 'prompt':177 'protocol':47 'provid':33 'quot':133 'rate':97,131 'readm':169 'render':172 'request':12,26,75,151,204 'request/response':188 'requir':58,99 'resourc':39 'return':53,199 'schema':186 'scheme':86 'sentiment':120 'serv':206 'settl':153 'span':114 'spars':163 'specif':37 'specifi':89 'standard':55 'summar':123 'text':122 'token':132 'uniform':146 'unit':64 'unknown':217 'usdc':14,28,66,76,159 'usdc-base-network' 'use':77,158 'util':138 'valid':140 'varieti':106 'via':43,83 'wallet':90,176 'web3':127 'x402':2,16,45,56 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"917bce40-5001-4725-b465-0e877e1ac86a","listingId":"6977f67f-55b1-4c3b-8e63-ba30d3953587","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:38.743Z"}],"sources":[{"listingId":"6977f67f-55b1-4c3b-8e63-ba30d3953587","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:38.743Z","lastSeenAt":"2026-04-27T22:33:20.591Z"}],"details":{"listingId":"6977f67f-55b1-4c3b-8e63-ba30d3953587","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/34 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34"}],"useCases":["Retrieving portfolio data without needing API key registration","Programmatic access to portfolio information via micropayment","Agent-driven data retrieval with per-call USDC settlement on Base"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-per-use pricing with no commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.637Z"},"updatedAt":"2026-04-27T22:33:20.591Z"}}