{"id":"f972ba83-b569-4e2a-96c9-fc6f991e8dfb","shortId":"2nxNd9","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is a multi-category API platform that gates all endpoints behind the x402 payment protocol, settling in USDC on the Base network. The specific endpoint `/api/v1/carts/56` is listed as \"Premium API Access\" and requires a payment of up to 20,000 units of USDC (the asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals, so this equals $0.02). It accepts POST requests and returns application/json.\n\nThe broader platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific behavior of the `/api/v1/carts/56` endpoint (what it returns, what input it expects) is not documented and cannot be inferred from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","post-method","no-api-key"],"categories":["api-gateway","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/README pages render only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/carts/56 ('Premium API Access') is undocumented and unclear","No request or response examples could be sourced","The platform lists many endpoint categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/56","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/carts/56","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 essentially no documentation: no OpenAPI spec, no request/response schemas, no examples, and all doc pages just show 'Connect wallet'. The purpose of /api/v1/carts/56 specifically is unclear. Pricing is stated on the landing page but nothing else is 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'/api/v1/carts/56':64,209 '/docs':170 '/pricing':172 '/readme':174 '/request':16,34 '0.02':15,33,94,147 '000':79 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':86 '20':78 '6':89 'Base network API' 'USDC API' 'accept':96 'access':70 'advertis':105 'ai':9,27,116 'analysi':120 'analyt':8,26,110 'api':4,22,43,69,152 'application/json':101 'asset':84 'avail':200,227 'base':7,25,59 'base-network' 'behavior':206 'behind':49 'beyond':162 'broader':103 'cannot':222 'categori':42,108 'classif':123 'commit':160 'connect':180 'content':186 'convers':140 'crawl':203 'crypto-paid API' 'data':109,113 'decim':90 'document':161,195,220 'embed':124 'endpoint':13,31,48,63,107,143,210 'equal':93 'estim':134 'exampl':199 'exchang':129 'expect':217 'export':114 'extrem':167 'feed':128 'financ':10,28,125 'four':106 'gas':133 'gate':3,21,46 'generat':141 'geocod':138 'infer':224 'infrastructur':136 'input':215 'insight':115 'json-api' 'key':153 'land':164 'learn':118 'limit':156 'list':66 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':117 'materi':228 'metric':111 'micropayment API' 'minimum':159 'multi':41 'multi-categori':40 'network':60 'no-api-key' 'openapi':190 'page':165,175 'pay-per-call API' 'pay-per-request' 'payment':52,74 'per':148 'platform':44,104 'post':97 'post-method' 'premium':68 'premium API access' 'price':127,145 'prompt':182 'protocol':53 'quot':132 'rate':130,155 'render':177 'report':112 'request':98,149 'request/response':193 'requir':72 'return':100,213 'schema':194 'sentiment':119 'settl':54 'spec':191 'specif':62,205 'substant':185 'suit':5,23 'summar':122 'text':121 'thin':168 'token':131 'unit':80 'usag':198 'usdc':18,36,56,82 'usdc-settlement' 'util':12,30,137 'valid':139 'via':17,35 'wallet':181 'web3':126 'x402':2,20,51 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"9be5ed05-4678-45df-8aa5-3865aa41da28","listingId":"f972ba83-b569-4e2a-96c9-fc6f991e8dfb","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/carts/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:13.476Z"}],"sources":[{"listingId":"f972ba83-b569-4e2a-96c9-fc6f991e8dfb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:13.476Z","lastSeenAt":"2026-04-24T13:31:32.099Z"}],"details":{"listingId":"f972ba83-b569-4e2a-96c9-fc6f991e8dfb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/56 \\\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":"Endpoint returns 402 with x402 challenge requiring up to 20000 units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/56"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/56"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic agent-driven API consumption settled on-chain via x402","Accessing analytics, AI inference, finance data, or utility services with USDC micropayments"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access on Base","Projects that prefer on-chain USDC settlement over traditional billing","Low-volume or sporadic API consumers who want zero commitment"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.3Z"},"updatedAt":"2026-04-24T13:31:32.099Z"}}