{"id":"2e3c038d-479d-4504-ae32-2ec9c665bc17","shortId":"grffqv","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","description":"This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (portfolio ID 33) via the x402 payment protocol. It is part of a broader platform that offers data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all gated behind per-request USDC micropayments on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The platform advertises no API keys, no rate limits, and instant access — you pay per call and that's it.\n\nThe specific portfolio resource at `/api/v1/portfolios/33` is labeled \"Premium API Access\" but no further documentation describes the schema of the response or what portfolio data is returned. The docs, pricing, API, and README pages on the site all render only a \"Connect wallet\" prompt with no additional content. Without an OpenAPI spec, response examples, or detailed documentation, the exact shape and utility of the returned data remain unclear. The platform hosts many other endpoints across analytics, AI, finance, and utility categories, all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","402 payment endpoint"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All doc/pricing/README pages return only a 'Connect wallet' prompt with no content","The specific meaning of 'portfolios/33' is undocumented; it is unclear what data is returned","No response examples exist in the crawl material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/33","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/33","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no response schema, no example responses, and the documentation pages are empty stubs. The purpose of 'portfolios/33' is entirely opaque beyond the generic label 'Premium API 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'0.02':9,26,129,237 '000':120 '20':119 '33':48 '402 payment endpoint' '6':125 'Base network API' 'USDC pay-per-call' 'accept':86 'access':40,143,162 'across':226 'addit':198 'advertis':134 'ai':228 'ai/ml':65 'amount':116 'analyt':64,227 'api':15,32,71,136,161,182 'attach':101 'base':7,24,82,113,121 'base-network' 'behind':74 'broader':59 'call':147 'caller':100 'categori':232 'connect':193 'content':199 'data':63,176,217 'decim':126 'describ':167 'detail':207 'doc':180 'document':166,208 'endpoint':5,22,36,85,225 'equal':128 'exact':210 'exampl':205 'financ':229 'finance/web3':67 'gate':3,20,73 'handl':94 'header':106 'host':222 'id':47 'infer':66 'infrastructur':69 'inlin':95 'instant':142 'json':91 'json-response' 'key':16,33,137 'label':159 'limit':140 'lowpaymentfee' 'lowpaymentfee.com':38 'mani':223 'maximum':115 'micropay':79 'micropayment API' 'need':17,34 'network':83 'no-api-key' 'offer':62 'openapi':202 'page':185 'part':56 'pay':8,25,145 'payment':52,92,105,111 'per':10,27,76,130,146 'per-request':75 'per-request-billing' 'platform':60,133,221 'point':239 'portfolio':4,21,44,46,154,175 'portfolio API' 'portfolio-data' 'post':87 'premium':160 'price':181,238 'prompt':195 'protocol':53,99 'provid':39 'rate':139 'readm':184 'remain':218 'render':190 'request':11,28,77,88,131 'requir':117 'resourc':45,155 'respons':172,204 'return':90,178,216 'schema':169 'shape':211 'sign':109 'site':188 'spec':203 'specif':43,153 'unclear':219 'unit':122 'usdc':13,30,78,110,124 'usdc-micropayment' 'util':70,213,231 'via':49,96 'wallet':194 'without':200 'x':104 'x-payment':103 'x402':2,19,51,98 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"420c8b85-a376-49e3-9765-9f3c7b9ea1b0","listingId":"2e3c038d-479d-4504-ae32-2ec9c665bc17","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:42.339Z"}],"sources":[{"listingId":"2e3c038d-479d-4504-ae32-2ec9c665bc17","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:42.339Z","lastSeenAt":"2026-04-27T22:33:20.749Z"}],"details":{"listingId":"2e3c038d-479d-4504-ae32-2ec9c665bc17","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/33 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20000 base units of USDC on Base (asset 0x8335…)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/33"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across data & analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching portfolio data without managing API keys or subscriptions","Agent-driven data retrieval with inline USDC micropayments on Base","Integrating pay-per-request portfolio lookups into automated workflows"],"bestFor":["Developers wanting zero-friction, keyless API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-as-you-go pricing with no commitments"],"notFor":["Users who need detailed documentation or response schema guarantees before integrating","Anyone without a Base-compatible USDC wallet or x402 client","High-volume consumers who need bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.45Z"},"updatedAt":"2026-04-27T22:33:20.749Z"}}