{"id":"ff502ba6-c93a-4ee1-b5b3-7e333df155ea","shortId":"6Ghppm","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"lowpaymentfee.com is a pay-per-call API platform that gates its endpoints behind the x402 payment protocol on the Base network. The specific endpoint `/api/v1/policies/37` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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 the same $0.02/request price point. However, the specific functionality behind `/api/v1/policies/37` (\"Premium API Access\") is not documented in detail — it is unclear whether this is a meta-endpoint for policy management or maps to one of the listed categories.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation of expected input or output, callers will need to experiment or contact the provider.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","post-endpoint","pay-per-call"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for this endpoint","The specific functionality of /api/v1/policies/37 ('Premium API Access') is undocumented and unclear","No example requests or responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no description of what 'Premium API Access' actually returns. The listing is effectively a stub with confirmed pricing and 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'/api/v1/policies/37':64,179 '/docs':214 '/pricing':216 '/readme':218 '/request':171 '0.02':10,29,90,170 '000':94 '0x8335':81 '20':93 '2913':82 '402':256 '6':98 'Base network API' 'USDC micropayment API' 'accept':72 'access':6,25,70,182 'account':104 'advertis':125 'ai':137 'analysi':141 'analyt':131 'api':5,24,46,69,101,127,181 'attach':109 'avail':244 'base':8,27,59,84,95 'base-network' 'behind':52,178 'broader':122 'call':45 'caller':107,266 'categori':128,208 'challeng':257 'classif':144 'confirm':251 'connect':224 'contact':272 'content':230 'contract':80 'convers':161 'cost':88 'crawl':247 'crypto-paid API' 'data':130,134 'decim':99 'detail':187 'document':185,209,239,260 'embed':145 'endpoint':51,63,164,197,249 'estim':155 'exampl':243 'exchang':150 'expect':262 'experi':270 'export':135 'extrem':211 'feed':149 'financ':146 'function':177 'gas':154 'gate':3,22,49 'generat':162 'geocod':159 'header':114 'howev':174 'includ':129 'infrastructur':157 'input':263 'insight':136 'key':16,35,102 'learn':139 'limit':19,38 'list':66,166,207 'live':252 'lowpaymentfee' 'lowpaymentfee.com':39,123 'machin':138 'manag':200 'map':202 'maximum':87 'meta':196 'meta-endpoint':195 'metric':132 'multipl':126 'need':268 'network':60 'no-api-key' 'one':204 'openapi':234 'output':265 'page':219 'pay':9,28,43 'pay-per-cal':42 'pay-per-call' 'pay-per-call API' 'payment':55,75,113,119 'per':11,30,44,91 'per-request-billing' 'platform':47,124 'point':173 'polici':199 'post':73 'post-endpoint' 'premium':4,23,68,180 'premium API access' 'price':148,172 'prompt':226 'proof':120 'protocol':56 'provid':274 'quot':153 'rate':18,37,151 'render':221 'report':133 'request':12,31,74,92 'request/response':237 'requir':106 'return':253 'schema':238 'sentiment':140 'settl':77 'simpli':108 'spars':212 'spec':235 'specif':62,176 'summar':143 'text':142 'token':152 'unclear':190 'unit':96 'usag':242 'usdc':14,33,79 'usdc-settlement' 'util':158 'valid':117,160,255 'wallet':225 'web3':147 'whether':191 'without':259 'x':112 'x-payment':111 'x402':2,21,54,118 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"58e55d22-09f7-4014-ba4d-7e27e491043c","listingId":"ff502ba6-c93a-4ee1-b5b3-7e333df155ea","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:57.749Z"}],"sources":[{"listingId":"ff502ba6-c93a-4ee1-b5b3-7e333df155ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:57.749Z","lastSeenAt":"2026-04-23T08:01:37.527Z"}],"details":{"listingId":"ff502ba6-c93a-4ee1-b5b3-7e333df155ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/37 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/37"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/37"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing gated API services without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request endpoints into agent workflows via x402"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle x402 payments on Base","Users comfortable paying per-request in USDC"],"notFor":["Users who need detailed API documentation before integrating","Anyone who cannot transact in USDC on the Base network","High-volume callers who need bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.589Z"},"updatedAt":"2026-04-23T08:01:37.527Z"}}