{"id":"4efadebb-f737-4e61-8e24-dedc0ad6f364","shortId":"HpCp5g","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The provider operates a suite of pay-per-request APIs spanning data & analytics, 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, settled in USDC on Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/310` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts HTTP POST requests and returns application/json responses. The timeout for payment settlement is 300 seconds.\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 schema, no request/response examples, and no description of what data or functionality this specific `/charges/310` endpoint actually returns. The provider's landing page lists many API categories but does not clarify which charge ID maps to which service. Without documentation or example payloads, the actual utility of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","http-post"],"categories":["api-gateway","pay-per-use"],"synonyms":["lowpaymentfee","x402 api","micropayment api","pay per request api","usdc api access","base network api","low fee api"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","It is unclear what specific functionality '/api/v1/charges/310' provides; the charge ID is not mapped to any named service","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/310","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/310","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 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what '/api/v1/charges/310' specifically does beyond the generic label 'Premium API Access'. The listing is effectively a 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'/charges/310':217 '0.02':10,24,90,143 '000':130 '0x8335':135 '20':129 '2913':136 '300':175 '6':139 'accept':161 'access':6,20,36,118 'actual':219,247 'ai':59 'analysi':63 'analyt':58 'api':5,19,35,55,100,117,183,228 'application/json':167 'base':8,22,43,97,131,138 'base network api' 'base-network' 'behind':37 'categori':229 'challeng':124 'charg':235 'clarifi':233 'classif':66 'commit':107 'connect':192 'content':198 'convers':83 'data':57,212 'decim':140 'descript':209 'doc':182 'document':177,242 'embed':67 'endpoint':30,86,111,160,218,251 'equal':142 'estim':77 'exact':150 'exampl':206,244 'exchang':72 'extrem':179 'feed':71 'financ':68 'function':214 'gas':76 'gate':3,17 'generat':84 'geocod':81 'header':158 'http':162 'http-post' 'id':236 'includ':153 'infrastructur':79 'json-response' 'key':101 'land':224 'learn':61 'limit':104 'list':114,226 'low fee api' 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':60 'made':146 'mani':227 'map':237 'maxamountrequir':127 'micropayment api' 'network':44 'no-api-key' 'openapi':202 'oper':47 'page':187,225 'pay':9,23,52 'pay per request api' 'pay-per-request':51 'payload':245 'payment':144,157,172 'paywal':40 'per':11,25,53,91 'post':163 'premium':4,18,34,116 'price':70,88,184 'prompt':194 'provid':33,46,222 'quot':75 'rate':73,103 'readm':186 'remain':252 'render':189 'request':12,26,54,92,164 'request/response':205 'requir':108 'respons':168 'return':120,166,220 'schema':203 'scheme':151 'second':176 'sentiment':62 'servic':240 'settl':93 'settlement':173 'span':56 'spars':180 'specif':110,216 'suit':49 'summar':65 'text':64 'timeout':170 'token':74 'unclear':253 'unit':132 'usdc':14,28,95,134 'usdc api access' 'usdc-settlement' 'util':80,248 'valid':82,122 'via':147 'wallet':193 'web3':69 'without':241 'x':156 'x-payment':155 'x402':2,16,39,123,149 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"08ac863e-7915-425e-ad39-353184c5aad5","listingId":"4efadebb-f737-4e61-8e24-dedc0ad6f364","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/310","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:03.048Z"}],"sources":[{"listingId":"4efadebb-f737-4e61-8e24-dedc0ad6f364","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/310","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:03.048Z","lastSeenAt":"2026-04-24T00:31:56.842Z"}],"details":{"listingId":"4efadebb-f737-4e61-8e24-dedc0ad6f364","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/310 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/310"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider 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/310"}],"useCases":["Programmatic access to paid API services without traditional API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Accessing data, analytics, AI inference, or finance endpoints at $0.02 per call"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access on Base","Low-cost micropayment API consumption without subscriptions","x402-compatible agent toolchains that settle payments in USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume batch processing where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.734Z"},"updatedAt":"2026-04-24T00:31:56.842Z"}}