{"id":"7f768004-7135-45c8-affe-5c8bde526317","shortId":"8mwGqu","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/policies/46` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment header. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises four categories of APIs: 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the `/api/v1/policies/46` endpoint is unclear beyond its \"Premium API Access\" label. Agents should expect to send a POST with an x402 payment header, but the required request body format and response structure are undocumented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are completely unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The specific purpose of /api/v1/policies/46 ('Premium API Access') is not explained anywhere in the crawled material","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/46","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/policies/46","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 request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of '/api/v1/policies/46' is opaque. Effectively a stub 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'/api/v1/policies/46':63,223 '/docs':183 '/pricing':185 '/readme':187 '/request':17,34 '0.02':16,33,99,163 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':111 '0x8335':93 '20':87 '2913':94 '300':114 '6':104 'Base network API' 'USDC API' 'accept':71 'access':69,231 'address':110 'advertis':120 'agent':233 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,41,68,124,168,230 'avail':214 'base':7,24,57,89,96 'base-network' 'behind':49,221 'beyond':227 'bodi':249 'broader':118 'categori':122 'challeng':81 'classif':139 'collect':46 'commit':176 'connect':193 'convers':156 'cost':85 'crawl':217 'data':9,26,125,129 'decim':105 'detail':200 'document':178,209 'embed':140 'endpoint':14,31,48,61,159,224 'equal':98 'estim':150 'exact':219 'exampl':213 'exchang':145 'expect':235 'export':130 'extrem':180 'feed':144 'financ':11,28,141 'format':250 'four':121 'function':220 'gas':149 'gate':3,20,44 'generat':157 'geocod':154 'header':78,244 'indic':82 'infrastructur':152 'insight':131 'key':169 'label':232 'learn':134 'limit':172 'list':65,161 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'marketplac':42 'maximum':84 'metric':127 'micropay':54 'micropayment API' 'minimum':175 'network':58 'no-api-key' 'offer':8,25 'openapi':204 'page':188 'pay-per-request API' 'payment':77,106,243 'per':51,100,164 'per-request':50 'per-request-billing' 'platform':5,22,119 'post':72,239 'post-endpoint' 'premium':67,229 'price':143 'prompt':195 'protocol':40 'quot':148 'rate':146,171 'render':190 'report':128 'request':52,73,101,165,248 'request/response':207 'requir':177,247 'respons':252 'schema':208 'second':115 'send':237 'sent':108 'sentiment':135 'spars':181 'spec':205 'specif':60 'structur':253 'summar':138 'technic':199 'text':137 'timeout':116 'token':147 'unclear':226 'undocu':255 'unit':90 'usag':212 'usdc':53,92,102 'usdc-micropayment' 'use':103 'util':13,30,153 'valid':155 'wallet':194 'web3':142 'x402':2,19,39,76,80,242 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"66a31711-52b2-41fe-81d3-848c568128ed","listingId":"7f768004-7135-45c8-affe-5c8bde526317","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/policies/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:53.511Z"}],"sources":[{"listingId":"7f768004-7135-45c8-affe-5c8bde526317","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:53.511Z","lastSeenAt":"2026-04-22T21:31:13.014Z"}],"details":{"listingId":"7f768004-7135-45c8-affe-5c8bde526317","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# POST to the endpoint after constructing the payment:\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/46 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/policies/46"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/46"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls without managing API keys or subscriptions","Agent-driven programmatic access to gated endpoints via x402 protocol"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with predictable flat-rate pricing","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.829Z"},"updatedAt":"2026-04-22T21:31:13.014Z"}}