{"id":"4f0d78b3-c7e1-43fc-8b97-c97eb125001b","shortId":"3FZmRe","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at `/api/v1/portfolios/75` via the x402 payment protocol. It is live and returns a proper 402 challenge when called without payment. The endpoint accepts POST requests and settles payments in USDC on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals), consistent with the provider's uniform pricing across all their API endpoints.\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no minimum commitments. Payments are made via the x402 exact-payment scheme on Base.\n\nThe specific `/api/v1/portfolios/75` endpoint is listed under \"Premium API Access\" but its exact data payload is not documented in the crawled material. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The endpoint's purpose — likely returning portfolio-related data given the URL path — must be inferred from the URL structure alone. The output MIME type is `application/json`.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The exact data returned by /api/v1/portfolios/75 is unknown; 'Premium API Access' is the only description","Portfolio ID 75 is hardcoded in the URL with no explanation of what it represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/75","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/75","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 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty (only 'Connect wallet'). The specific purpose of /api/v1/portfolios/75 is undocumented, making this effectively a stub 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'/request':143 '0.02':76,142 '000':78 '20':77 '402':51 '6':84 'Base network API' 'USDC micropayment API' 'accept':59 'access':35,177 'across':93 'ai/ml':114 'alon':237 'analysi':116 'analyt':113 'api':34,96,110,147,176,203 'application/json':243 'base':7,20,69,79,167 'base-network' 'broad':103 'call':54,109 'catalog':104 'challeng':52 'classif':118 'commit':155 'connect':209 'consist':86 'content':215 'convers':135 'crawl':188 'crypto payment API' 'data':112,181,225 'decim':85 'doc':200 'document':185 'embed':119 'endpoint':5,18,28,58,97,138,171,217 'estim':129 'exact':163,180 'exact-pay':162 'exampl':197 'exchang':124 'feed':123 'financ':120 'gas':128 'gate':3,16 'generat':136 'geocod':133 'given':226 'host':101 'infer':232 'infrastructur':131 'json-response' 'key':148 'like':220 'limit':151 'list':173 'live':46 'lowpaymentfee' 'lowpaymentfee.com':30,100 'made':158 'materi':189 'mime':240 'minimum':154 'must':230 'network':70 'openapi':193 'output':239 'page':204 'path':229 'pay':9,22,107 'pay-per-cal':106 'pay-per-call API' 'pay-per-request':8,21 'payload':182 'payment':42,56,64,156,164 'per':10,23,73,108 'portfolio':4,17,223 'portfolio API' 'portfolio-data' 'portfolio-rel':222 'post':60 'premium':33,175 'price':72,92,122,144,201 'prompt':211 'proper':50 'protocol':43 'provid':31,89,99 'purpos':219 'quot':127 'rate':125,150 'relat':224 'render':206 'request':11,24,61,74 'request/response':196 'resourc':36 'return':48,221 'schema':194 'scheme':165 'sentiment':115 'settl':63 'share':139 'span':111 'specif':169 'structur':236 'summar':117 'token':126 'type':241 'uniform':91 'unit':80 'url':228,235 'usdc':13,26,66,82 'usdc-settlement' 'util':132 'valid':134 'via':39,159 'wallet':210 'web3':121 'without':55 'x402':2,15,41,161 'x402 API' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"2e337564-665b-4db7-bec5-15dbbf590a36","listingId":"4f0d78b3-c7e1-43fc-8b97-c97eb125001b","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:21.815Z"}],"sources":[{"listingId":"4f0d78b3-c7e1-43fc-8b97-c97eb125001b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:21.815Z","lastSeenAt":"2026-04-27T17:05:04.883Z"}],"details":{"listingId":"4f0d78b3-c7e1-43fc-8b97-c97eb125001b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/75 \\\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":"The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 in USDC","source_url":"https://lowpaymentfee.com/api/v1/portfolios/75"},{"claim":"All endpoints on lowpaymentfee.com are priced at $0.02/request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/75"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Agent-driven data retrieval without API key management","Programmatic access to portfolio information via x402 protocol"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible clients on the Base network","Low-friction data retrieval without subscription commitments"],"notFor":["Users needing detailed API documentation or schema validation before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.592Z"},"updatedAt":"2026-04-27T17:05:04.883Z"}}