{"id":"6f285a8c-47ed-4579-a6b5-4768fa6d3c31","shortId":"ebBzC7","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (`/api/v1/portfolios/47`) via the x402 payment protocol. The endpoint is live and returns a standard 402 challenge requesting payment in USDC on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment is made via the x402 \"exact\" scheme, meaning each call requires a one-shot micropayment with no API keys, subscriptions, or rate limits.\n\nThe provider, lowpaymentfee.com, hosts a broader 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. However, the specific `/api/v1/portfolios/47` endpoint is not listed on the provider's homepage catalog, and no documentation describes what data it returns. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content.\n\nBecause there is no schema, documentation, or example response for this particular endpoint, the actual data returned is unknown. The endpoint is confirmed live (402 challenge captured), accepts POST requests, and returns `application/json`. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","portfolio-data","json-api","no-api-key","per-request-billing"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","crypto payment API"],"warnings":["No documentation or response schema available for /api/v1/portfolios/47","This specific endpoint is not listed on the provider's homepage catalog — its purpose is unclear","All crawled subpages (docs, api, pricing, README) returned only 'Connect wallet' with no content","Cannot verify what data is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/47","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on what /api/v1/portfolios/47 actually returns. No OpenAPI schema, no example responses, and the crawled docs pages are empty. The endpoint isn't even listed in the provider's own catalog. This is effectively a stub 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'0.02':9,26,75,153 '000':77 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':236 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':240 '20':76 '402':60,221 '6':83 'Base network API' 'USDC pay-per-call' 'accept':224 'access':40 'actual':211 'addit':195 'address':235 'ai/ml':125 'analysi':128 'analyt':124 'api':15,32,104,121,181 'application/json':229 'base':7,24,68,78,242 'base-network' 'broader':115 'call':95 'captur':223 'catalog':116,169 'challeng':61,222 'classif':130 'confirm':219 'connect':190 'content':196 'contract':239 'convers':146 'crawl':179 'crypto payment API' 'data':123,175,212 'decim':84 'describ':173 'direct':233 'doc':180 'document':172,202 'embed':131 'endpoint':5,22,36,53,149,160,209,217 'estim':140 'exact':91 'exampl':204 'exchang':135 'feed':134 'finance/web3':132 'gas':139 'gate':3,20,120 'generat':147 'geocod':144 'homepag':168 'host':113 'howev':156 'infer':126 'infrastructur':142 'json-api' 'key':16,33,105 'limit':109 'list':151,163 'live':55,220 'lowpaymentfee' 'lowpaymentfee.com':38,112 'made':87 'mean':93 'micropay':101 'micropayment API' 'network':69 'no-api-key' 'one':99 'one-shot':98 'page':185 'particular':208 'pay':8,25 'payment':50,63,85,231 'per':10,27,72,154 'per-request-billing' 'portfolio':4,21,44 'portfolio API' 'portfolio-data' 'post':225 'price':71,133,182 'prompt':192 'protocol':51 'provid':39,111,166 'quot':138 'rate':108,136 'readm':184 'render':187 'request':11,28,62,73,155,226 'requir':17,34,96 'resourc':45 'respons':205 'return':57,177,213,228 'schema':201 'scheme':92 'sentiment':127 'shot':100 'span':122 'specif':43,158 'standard':59 'subscript':106 'summar':129 'token':137 'unit':79 'unknown':215 'usdc':13,30,65,81,238 'usdc-micropayment' 'use':237 'util':143 'valid':145 'via':47,88 'wallet':191 'x402':2,19,49,90,119 'x402 portfolio' 'x402-gated':1,18,118 'x402-payment'","prices":[{"id":"11d950fd-f371-4b59-b1ef-620c669ce3e0","listingId":"6f285a8c-47ed-4579-a6b5-4768fa6d3c31","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:58.971Z"}],"sources":[{"listingId":"6f285a8c-47ed-4579-a6b5-4768fa6d3c31","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:58.971Z","lastSeenAt":"2026-04-27T21:34:09.929Z"}],"details":{"listingId":"6f285a8c-47ed-4579-a6b5-4768fa6d3c31","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/47 \\\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 a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/47"},{"claim":"Provider lists all APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/47"}],"useCases":["Fetching portfolio data with a single USDC micropayment on Base","Agent-driven data retrieval without managing API keys or subscriptions","Programmatic access to portfolio resource 47 via x402 protocol"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-friction one-shot data requests settled in USDC"],"notFor":["Users who need detailed documentation or response schemas before integrating","High-volume batch consumers who need bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.671Z"},"updatedAt":"2026-04-27T21:34:09.929Z"}}