{"id":"f403fdb6-29f8-4830-8467-89d36317badc","shortId":"GDA3b2","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 premium API access to a specific portfolio resource (portfolio ID 24) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The payment timeout is 300 seconds.\n\nDocumentation on the site is extremely thin: the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no example payloads. The exact data returned by the /portfolios/24 resource is unknown — the listing title \"Premium API Access\" is generic and does not clarify the domain. Callers should expect a JSON response but will need to experiment to discover the actual schema.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","json-response","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","premium data endpoint"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","The specific data returned by /portfolios/24 is undocumented; 'Premium API Access' is a generic label","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/24","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response examples, and the purpose of the /portfolios/24 resource is entirely unspecified. This is effectively a stub 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'0.02':9,26,120 '000':115 '0x8335':105 '20':114 '24':50 '2913':106 '300':157 '6':125 'Base network API' 'USDC API' 'accept':93 'access':42,219 'actual':242 'addit':182 'ai/ml':75 'amount':112 'analyt':74 'api':15,32,41,130,169,218 'attach':141 'base':7,24,89,108,116 'base-network' 'behind':84 'beyond':193 'broader':61 'call':70 'caller':139,228 'challeng':196 'clarifi':225 'commit':138 'connect':177 'contract':104 'data':73,78,206 'decim':126 'detail':184 'discov':240 'doc':167 'document':159 'domain':227 'dozen':65 'endpoint':5,22,36,71,92 'equal':119 'exact':205 'exampl':202 'expect':230 'experi':238 'extrem':164 'finance/web3':77 'gate':3,20,83 'generic':221 'header':146 'id':49 'infer':76 'infrastructur':80 'json':98,232 'json-response' 'key':16,33,131 'limit':134 'list':215 'lowpaymentfee' 'lowpaymentfee.com':38 'maximum':111 'micropay':86 'micropayment API' 'need':17,34,236 'network':90 'no-api-key' 'offer':64 'openapi':188 'outputschema':198 'page':172 'part':58 'pay':8,25,68 'pay-per-cal':67 'pay-per-call' 'pay-per-request' 'payload':203 'payment':54,99,145,151,154 'per':10,27,69,121 'platform':62 'portfolio':4,21,46,48 'portfolio API' 'portfolio-data' 'post':94 'premium':40,217 'premium data endpoint' 'price':168 'prompt':179 'proof':152 'protocol':55 'provid':39 'rate':133 'readm':171 'render':174 'request':11,28,95,122 'request/response':191 'resourc':47,211 'respons':233 'return':97,207 'schema':192,243 'second':158 'settl':101 'simpli':140 'site':162 'span':72 'spec':189 'specif':45 'stub':199 'subscript':137 'technic':183 'thin':165 'timeout':155 'titl':216 'unit':117 'unknown':213 'usdc':13,30,103,123 'usdc-micropayment' 'use':124 'util':81 'valid':149 'via':51 'wallet':178 'x':144 'x-payment':143 'x402':2,19,53,85,150,195 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"5d31c0bd-c4cb-48c7-8c23-c1efc11f464b","listingId":"f403fdb6-29f8-4830-8467-89d36317badc","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:27.280Z"}],"sources":[{"listingId":"f403fdb6-29f8-4830-8467-89d36317badc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:27.280Z","lastSeenAt":"2026-04-28T04:34:05.453Z"}],"details":{"listingId":"f403fdb6-29f8-4830-8467-89d36317badc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/24 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/24"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/24"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, API, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Integrating pay-as-you-go data access into autonomous agents without managing API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents that need keyless, pay-per-call API access","Low-volume consumers who want no subscription commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.193Z"},"updatedAt":"2026-04-28T04:34:05.453Z"}}