{"id":"e135ade5-8964-4881-b55e-03472e20b6dd","shortId":"5jHNef","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 exposes a portfolio resource at `/api/v1/portfolios/36` behind an x402 payment challenge. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific `/api/v1/portfolios/36` endpoint accepts POST requests and returns `application/json`. Payment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals) to the payee address `0x1A2B…85F3` on Base. No API keys, rate limits, or upfront commitments are required — each call is independently paid.\n\nBecause the endpoint path suggests a portfolio resource (ID 36), it likely returns portfolio-related data, but no OpenAPI schema, request body schema, or response examples are documented. The platform's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. Without additional documentation it is unclear what fields the POST body should contain or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","portfolio-data","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment endpoint"],"warnings":["No OpenAPI or request/response schema available — callers must guess the POST body format","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","The specific resource /api/v1/portfolios/36 is not listed on the homepage's API catalog, so its purpose is unclear","No rate-limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/36","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and the docs pages are empty stubs showing only 'Connect wallet'. The purpose of the specific /portfolios/36 resource is 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'0.02':9,26,70,121 '000':117 '0x1a2b':131 '20':116 '36':159 '402 payment endpoint' '6':125 '85f3':132 'Base network API' 'USDC micropayment API' 'accept':85 'addit':200 'address':130 'ai/ml':60 'analyt':59 'api':15,32,66,136,185 'application/json':90 'attach':102 'base':7,24,79,118,134 'behind':45 'bodi':172,209 'broader':55 'call':146 'caller':101 'challeng':49 'commit':142 'connect':191 'contain':108,211 'data':58,166 'decim':126 'detail':198 'doc':182 'document':178,201 'endpoint':5,22,36,84,152 'exact':98 'exact-pay':97 'exampl':176 'expos':39 'field':206 'finance/web3':62 'gate':3,20 'given':122 'handl':93 'header':107 'i.e':120 'id':158 'independ':148 'infer':61 'infrastructur':64 'json-api' 'key':16,33,137 'like':161,218 'limit':139 'look':217 'lowpaymentfee' 'lowpaymentfee.com':38 'network':80 'no-api-key' 'offer':57 'openapi':169 'page':186 'paid':149 'part':52 'path':153 'pay':8,25 'pay-per-call API' 'paye':129 'payload':216 'payment':48,91,99,106,112 'per':10,27,71 'per-request-billing' 'platform':56,180 'portfolio':4,21,41,156,164 'portfolio API' 'portfolio-data' 'portfolio-rel':163 'post':86,208 'price':68,183 'prompt':193 'rate':138 'relat':165 'render':188 'request':11,28,72,87,171 'requir':17,34,144 'resourc':42,157 'respons':175,215 'return':89,162 'schema':170,173 'scheme':100 'settl':74 'sign':110 'specif':82 'suggest':154 'technic':197 'unclear':204 'unit':119 'upfront':141 'usdc':13,30,76,111,123 'usdc-base' 'util':65 'via':94 'wallet':192 'without':199 'x':105 'x-payment':104 'x402':2,19,47,96 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"6d279057-3e42-4c78-ae3a-1cdba316ee56","listingId":"e135ade5-8964-4881-b55e-03472e20b6dd","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:41.127Z"}],"sources":[{"listingId":"e135ade5-8964-4881-b55e-03472e20b6dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:41.127Z","lastSeenAt":"2026-04-27T22:33:20.682Z"}],"details":{"listingId":"e135ade5-8964-4881-b55e-03472e20b6dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/36 \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/36"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/36"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Integrating pay-as-you-go financial data into agent workflows without managing API keys","Programmatic access to portfolio resources settled on Base L2"],"bestFor":["Developers who want keyless, pay-per-call API access","AI agents with Base USDC wallets needing portfolio data","Prototyping x402-based payment flows"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.523Z"},"updatedAt":"2026-04-27T22:33:20.682Z"}}