{"id":"4fc4ed26-9112-4e84-9ea8-bd89b043b3f8","shortId":"RsUNZH","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 \"portfolios\" resource (specifically portfolio ID 99) via the x402 payment protocol. The endpoint is live and returns a standard x402 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 via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\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 priced at $0.02 per request. However, the specific endpoint being listed here (/api/v1/portfolios/99) is not explicitly described on the provider's landing page among the advertised API categories, so its exact response schema and data content are unclear. The endpoint accepts POST requests and returns application/json.\n\nThe USDC payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base, using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The maximum timeout for payment settlement is 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found during the crawl — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-data","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","USDC pay-per-call","Base network API","crypto portfolio data","lowpaymentfee","402 payment API"],"warnings":["The /api/v1/portfolios/99 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose and response format are unverified.","No documentation, OpenAPI spec, or example responses are available; docs/pricing/API pages only show 'Connect wallet'.","Response schema is entirely unknown — no outputSchema fields beyond the HTTP method were provided.","It is unclear whether other portfolio IDs (e.g., /portfolios/1) are valid endpoints."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/99","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/99","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, but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example responses, and the specific /portfolios/99 resource is not described on the provider's own landing page. The actual data returned is 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'0.02':10,24,69,138 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':189 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':197 '20':70 '300':205 '402 payment API' '6':77 '99':42 'Base network API' 'USDC pay-per-call' 'accept':176 'access':34 'addit':235 'address':188 'advertis':161 'ai/ml':111 'among':159 'analysi':114 'analyt':110 'api':89,107,162,224 'application/json':181 'base':8,22,64,72,191 'broader':101 'catalog':102 'categori':163 'challeng':57 'classif':116 'connect':230 'content':171,236 'contract':195 'convers':133 'cost':68 'crawl':219 'crypto portfolio data' 'data':5,19,109,170 'decim':78 'describ':152 'detail':210 'doc':221 'document':211 'embed':117 'endpoint':6,20,30,49,144,175 'estim':127 'exact':85,166 'exampl':213 'exchang':122 'explicit':151 'feed':121 'financ':118 'found':216 'gas':126 'gate':3,17,106 'generat':134 'geocod':131 'host':99 'howev':141 'id':41 'infer':112 'infrastructur':129 'json-response' 'key':90 'land':157 'limit':92 'list':146 'live':51 'lowpaymentfee' 'lowpaymentfee.com':32,98 'made':81 'maximum':199 'network':65 'no-api-key' 'openapi':208 'page':158,225 'pay':9,23 'pay-per-request' 'payment':46,59,79,184,202 'per':11,25,139 'portfolio':4,18,37,40 'portfolio API' 'portfolio-data' 'post':177 'price':120,136,222 'prompt':232 'protocol':47 'provid':33,97,155 'quot':125 'rate':91,123 'render':227 'request':12,26,67,140,178 'requir':58,95 'resourc':38 'respons':167,214 'return':53,180 'schema':168,209 'scheme':86 'second':206 'sent':186 'sentiment':113 'settlement':203 'span':108 'specif':39,143 'standard':55 'subscript':94 'summar':115 'timeout':200 'token':124 'unclear':173 'unit':73 'usdc':14,28,61,75,183,194 'usdc-base' 'use':192 'util':130 'valid':132 'via':43,82 'wallet':231 'web3':119 'x402':2,16,45,56,84,105 'x402 portfolio' 'x402-gated':1,15,104 'x402-payment'","prices":[{"id":"4c575513-dbd0-49e9-bc21-e64f4546e5b7","listingId":"4fc4ed26-9112-4e84-9ea8-bd89b043b3f8","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:00.394Z"}],"sources":[{"listingId":"4fc4ed26-9112-4e84-9ea8-bd89b043b3f8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:00.394Z","lastSeenAt":"2026-04-27T12:34:57.108Z"}],"details":{"listingId":"4fc4ed26-9112-4e84-9ea8-bd89b043b3f8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/99 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","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 USDC payment on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/99"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/portfolios/99"},{"claim":"The provider lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories but does not list a portfolios endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving portfolio data for portfolio ID 99 via a single paid API call","Integrating pay-per-request portfolio lookups into agent workflows without API key management","Programmatic access to portfolio information settled in USDC on Base"],"bestFor":["Agents or bots that need keyless, pay-per-call access to portfolio data","Developers experimenting with x402 payment protocol integrations","Use cases where avoiding subscription commitments is preferred"],"notFor":["Users who need detailed documentation or guaranteed SLA before integrating","Bulk or high-frequency portfolio data retrieval where per-call costs add up","Anyone needing portfolio data for IDs other than 99 (unclear if other IDs are available)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.693Z"},"updatedAt":"2026-04-27T12:34:57.108Z"}}