{"id":"49c8e194-ff5d-4ee4-813e-57ae6066a134","shortId":"zsfxJ5","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 platform that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/charges/382` is labeled \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. Payment is handled via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.\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 the same $0.02/request price point. The endpoint accepts HTTP POST requests and returns application/json responses.\n\nDocumentation is extremely sparse — the docs, pricing, API, 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 crawled content. The specific functionality behind the `/api/v1/charges/382` path is unclear; it may be a generic charge endpoint or a specific resource. Without documentation, the actual input parameters and response format cannot be determined.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","http-post","json-response"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or schema specification found","The specific functionality of /api/v1/charges/382 ('Premium API Access') is undefined — it is unclear what data it returns or what input it expects","No request or response examples available from any crawled source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/382","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/charges/382","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/charges/382 is unclear. This is effectively a stub 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'/request':17,34,155 '0.02':16,33,84,154 '000':78 '20':77 'Base network API' 'USDC API' 'accept':160 'access':44,71 'actual':232 'advertis':109 'ai':10,27,121 'analysi':125 'analyt':115 'api':4,21,40,70,97,113,175 'application/json':166 'avail':204 'base':7,24,60,79 'base-network' 'behind':50,212 'broader':107 'call':86 'cannot':238 'categori':111 'charg':223 'classif':128 'connect':183 'content':208 'convers':145 'crawl':207 'data':9,26,114,118 'detail':190 'determin':240 'doc':173 'document':168,199,230 'embed':129 'endpoint':14,31,49,64,148,159,224 'estim':139 'exact':93 'exampl':203 'exchang':134 'export':119 'extrem':170 'feed':133 'financ':11,28,130 'format':237 'four':110 'function':211 'gas':138 'gate':3,20,43 'generat':146 'generic':222 'geocod':143 'handl':89 'http':161 'http-post' 'i.e':83 'infrastructur':141 'input':233 'insight':120 'json-response' 'key':98 'label':68 'learn':123 'limit':101 'list':150 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'maximum':75 'may':219 'metric':116 'micropay':54 'micropayment API' 'network':61 'no-api-key' 'offer':8,25 'openapi':194 'page':178 'paramet':234 'path':215 'pay-per-request API' 'payment':87 'per':52,85 'per-request':51 'per-request-billing' 'platform':5,22,41,108 'point':157 'post':162 'premium':69 'price':132,156,174 'prompt':185 'protocol':39 'quot':137 'rate':100,135 'readm':177 'render':180 'report':117 'request':53,163 'request/response':197 'requir':73,105 'resourc':228 'respons':167,236 'return':165 'schema':198 'scheme':94 'sentiment':124 'settl':55 'spars':171 'spec':195 'specif':63,210,227 'subscript':104 'summar':127 'technic':189 'text':126 'token':136 'unclear':217 'unit':80 'usag':202 'usdc':57,82 'usdc-micropayment' 'util':13,30,142 'valid':144 'varieti':47 'via':90 'wallet':184 'web3':131 'without':229 'x402':2,19,38,92 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"e5c0585a-8779-4606-bcc4-1b7f0651d9d9","listingId":"49c8e194-ff5d-4ee4-813e-57ae6066a134","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/charges/382","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:21.118Z"}],"sources":[{"listingId":"49c8e194-ff5d-4ee4-813e-57ae6066a134","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/382","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:21.118Z","lastSeenAt":"2026-04-23T08:01:18.813Z"}],"details":{"listingId":"49c8e194-ff5d-4ee4-813e-57ae6066a134","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/382 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/382"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/382"}],"useCases":["Paying per-call for data analytics or report generation without subscriptions","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) via micropayments","Fetching crypto price feeds, exchange rates, or gas estimates on demand","Using utility services like geocoding or data validation with no account setup"],"bestFor":["Agents or developers wanting zero-signup, pay-as-you-go API access","Micropayment-native workflows on the Base L2 network","Prototyping or low-volume usage where subscription APIs are overkill"],"notFor":["High-volume production workloads needing detailed SLAs and documentation","Users without a Base-compatible USDC wallet","Anyone requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.81Z"},"updatedAt":"2026-04-23T08:01:18.813Z"}}