{"id":"72e8cd81-556f-465c-9979-ffbd3ea17f61","shortId":"Nd7jVV","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/charges/78` is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 examples of what this particular endpoint returns. The site's landing page lists many endpoints but provides no detail on input parameters or response formats. The endpoint is confirmed live (402 challenge captured), but without documentation it is difficult to know exactly what data or functionality the \"Premium API Access\" charge endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","premium API"],"warnings":["No OpenAPI spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no content","The specific functionality of /api/v1/charges/78 ('Premium API Access') is undocumented — unclear what it returns","No request body schema or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/78","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/78","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 there is no documentation, no OpenAPI spec, no request/response examples, and no clarity on what 'Premium API Access' actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,86,138 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '0x8335':132 '20':126 '2913':133 '300':158 '402':224 '6':142 'Base network API' 'USDC pay-per-call' 'accept':115 'access':7,22,38,113,243 'address':154 'advertis':121 'ai/ml':59 'amount':124 'analysi':62 'analyt':58 'api':6,21,37,55,95,112,167,242 'base':9,24,91,128,135 'broad':48 'call':4,19 'captur':226 'catalog':49 'challeng':120,225 'charg':244 'classif':64 'commit':103 'confirm':222 'connect':176 'content':182 'convers':81 'cost':85 'data':57,237 'decim':143 'detail':212 'difficult':232 'doc':166 'document':161,191,229 'embed':65 'endpoint':32,107,199,208,220,245 'equal':137 'estim':75 'exact':150,235 'exampl':194 'exchang':70 'extrem':163 'feed':69 'financ':66 'format':218 'function':239 'gas':74 'generat':82 'geocod':79 'given':139 'host':46 'infer':60 'infrastructur':77 'input':214 'json-response' 'key':96 'know':234 'label':110 'land':204 'limit':99 'list':206 'live':223 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':146 'mani':207 'max':123 'micropayment API' 'minimum':102 'network':92 'no-api-key' 'openapi':186 'page':171,205 'paramet':215 'particular':198 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-request':51 'payment':42,144 'per':3,18,53 'post':116 'post-endpoint' 'premium':5,20,36,111,241 'premium API' 'price':68,168 'prompt':178 'protocol':43 'provid':35,210,246 'quot':73 'rate':71,98 'readm':170 'render':173 'request':54,84,117 'request/response':189 'requir':104 'respons':217 'return':200 'schema':190 'scheme':151 'second':159 'sentiment':61 'settl':152 'site':45,202 'span':56 'spars':164 'spec':187 'specif':106 'summar':63 'timeout':160 'token':72 'unit':129 'usdc':15,30,88,131,140 'usdc-base' 'util':78 'valid':80 'via':10,25,39,147 'wallet':177 'web3':67 'without':228 'x402':11,26,41,119,149 'x402 API' 'x402-payment'","prices":[{"id":"8082c0e1-2749-4126-95af-4207992c757d","listingId":"72e8cd81-556f-465c-9979-ffbd3ea17f61","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:38.016Z"}],"sources":[{"listingId":"72e8cd81-556f-465c-9979-ffbd3ea17f61","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:38.016Z","lastSeenAt":"2026-04-22T09:01:03.296Z"}],"details":{"listingId":"72e8cd81-556f-465c-9979-ffbd3ea17f61","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/78 \\\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/78"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/78"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-call API services without needing API keys or subscriptions","Making micropayment-gated API requests settled in USDC on Base","Agent-driven programmatic access to premium data or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.987Z"},"updatedAt":"2026-04-22T09:01:03.296Z"}}