{"id":"f981a71f-77de-4f61-8724-ebb89b6d2ee5","shortId":"taNMvW","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 45) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals). Payment is made per-call with no API keys, no rate limits, and no subscriptions required.\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data & analytics, AI & machine learning (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 priced at $0.02 per request and settle in USDC on the Base network. This particular endpoint (/api/v1/portfolios/45) is labeled \"Premium API Access\" but its exact response payload is undocumented — the crawled docs pages returned only a wallet-connect prompt with no further detail.\n\nBecause there is no OpenAPI schema, no example request/response documentation, and no description of what the portfolio resource actually contains, the practical utility of this endpoint is difficult to assess without making a paid call. The x402 challenge confirms the endpoint is live and correctly configured, but the lack of documentation is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","portfolio-data","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","USDC pay-per-call","lowpaymentfee","Base network API","crypto micropayment API","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, and README pages all return only a wallet-connect prompt","No OpenAPI or output schema describing the response payload","The specific content of /api/v1/portfolios/45 is completely undocumented","Cannot verify what data is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and no description of what portfolio 45 actually returns. The docs, pricing, and README pages all render only a wallet-connect prompt with no 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'0.02':10,24,68,141 '000':70 '20':69 '402':55 '402 payment endpoint' '45':42 '6':76 'Base network API' 'USDC pay-per-call' 'access':34,160 'actual':201 'ai':111 'analysi':115 'analyt':110 'api':86,107,159 'assess':212 'base':8,22,63,71,150 'broad':101 'call':83,217 'catalog':102 'challeng':56,220 'classif':117 'configur':228 'confirm':221 'connect':177 'contain':202 'convers':134 'correct':227 'cost':67 'crawl':169 'crypto micropayment API' 'data':5,19,109 'decim':77 'descript':195 'detail':182 'difficult':210 'doc':170 'document':192,233 'embed':118 'endpoint':6,20,30,49,137,154,208,223 'estim':128 'exact':163 'exampl':190 'exchang':123 'feed':122 'financ':119 'gap':237 'gas':127 'gate':3,17,106 'generat':135 'geocod':132 'host':96 'id':41 'infrastructur':130 'json-response' 'key':87 'label':157 'lack':231 'learn':113 'limit':90 'live':51,225 'lowpaymentfee' 'lowpaymentfee.com':32,98 'machin':112 'made':80 'make':214 'network':64,151 'no-api-key' 'offer':99 'openapi':187 'page':171 'paid':216 'particular':153 'pay':9,23 'payload':165 'payment':46,58,78 'per':11,25,82,142 'per-cal':81 'per-request-billing' 'portfolio':4,18,38,40,199 'portfolio API' 'portfolio-data' 'practic':204 'premium':158 'price':121,139 'prompt':178 'protocol':47 'provid':33 'quot':126 'rate':89,124 'request':12,26,66,143 'request/response':191 'requir':57,94 'resourc':39,200 'respons':164 'return':53,172 'schema':188 'sentiment':114 'settl':145 'signific':236 'site':97 'span':108 'specif':37 'subscript':93 'summar':116 'token':125 'undocu':167 'unit':72 'usdc':14,28,60,74,147 'usdc-base' 'util':131,205 'valid':133 'via':43 'wallet':176 'wallet-connect':175 'web3':120 'without':213 'x402':2,16,45,105,219 'x402 portfolio' 'x402-gated':1,15,104 'x402-payment'","prices":[{"id":"4934e4f2-5433-4373-bd29-e84bb3f6423c","listingId":"f981a71f-77de-4f61-8724-ebb89b6d2ee5","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:49.518Z"}],"sources":[{"listingId":"f981a71f-77de-4f61-8724-ebb89b6d2ee5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:49.518Z","lastSeenAt":"2026-04-27T22:33:20.992Z"}],"details":{"listingId":"f981a71f-77de-4f61-8724-ebb89b6d2ee5","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/portfolios/45\n# Returns 402 with x402 challenge. Supply a signed USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/45"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/45"}],"useCases":["Retrieving portfolio data (ID 45) via a single paid API call","Demonstrating x402 payment protocol integration on Base","Agent-driven data retrieval with per-call USDC micropayments"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases needing keyless, pay-per-call API access"],"notFor":["Users who need detailed documentation before paying","High-volume consumers who need bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.081Z"},"updatedAt":"2026-04-27T22:33:20.992Z"}}