{"id":"1ea6a87c-d31a-4edc-b97d-009a7eeddaef","shortId":"hQJuWR","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). All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/178` 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), which equals $0.02. Payment is made via the x402 exact scheme, settling to the specified wallet address. 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 additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality \"Premium API Access\" at charges/178 specifically provides. The site appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-marketplace","x402"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC API","Base network API","pay-per-call API","micropayment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/178 ('Premium API Access') is undefined — it is unclear what data or service it provides","Site may be a demo or early-stage project"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/178","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/178","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 pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no indication of what 'Premium API Access' at charges/178 actually returns. The listing is effectively a stub with confirmed liveness and 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'/api/v1/charges/178':112 '/docs':171 '/pricing':172 '/readme':175 '/request':13,28 '0.02':12,27,88,141 '000':130 '0x8335':135 '20':129 '2913':136 '402':212 'Base network API' 'USDC API' 'accept':158 'access':7,22,38,118,227 'actual':206 'addit':186 'address':155 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,100,117,226,244 'appear':234 'application/json':164 'base':9,24,96,131,138 'broad':48 'call':4,19 'catalog':49 'challeng':124,213 'charges/178':229 'classif':64 'commit':107 'confirm':214 'connect':181 'content':188 'convers':81 'data':57,222 'demonstr':238 'document':166,197,217 'earli':241 'early-stag':240 'embed':65 'endpoint':32,84,111,157,205,209 'equal':140 'estim':75 'exact':148 'exampl':200 'exchang':70 'extrem':168 'feed':69 'financ':66 'function':224 'gas':74 'generat':82 'geocod':79 'host':46 'http':159 'http-post' 'infer':60 'infrastructur':77 'json-response' 'key':101 'limit':104 'list':114 'live':211 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':144 'marketplac':245 'maxamountrequir':127 'micropayment API' 'network':97 'no-api-key' 'openapi':192 'page':176 'particular':204 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payabl':91 'payment':42,142 'per':3,18,53,89 'post':160 'premium':5,20,36,116,225 'price':68,86 'prompt':183 'protocol':43 'provid':35,231 'quot':73 'rate':71,103 'render':178 'request':54,90,161 'request/response':195 'requir':108 'respons':165 'return':120,163,207 'schema':196 'scheme':149 'sentiment':61 'settl':150 'site':45,233 'span':56 'spars':169 'spec':193 'specif':110,230 'specifi':153 'stage':242 'summar':63 'technic':187 'token':72 'unclear':220 'unit':132 'usdc':15,30,93,134 'usdc-base' 'util':78 'valid':80,122 'via':10,25,39,145 'wallet':154,182 'web3':67 'without':216 'x402':11,26,41,123,147,243 'x402 API' 'x402-payment'","prices":[{"id":"ccd90f1f-fc7f-48fa-9d49-e61c33ac4d45","listingId":"1ea6a87c-d31a-4edc-b97d-009a7eeddaef","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:26.048Z"}],"sources":[{"listingId":"1ea6a87c-d31a-4edc-b97d-009a7eeddaef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:26.048Z","lastSeenAt":"2026-04-23T01:01:21.992Z"}],"details":{"listingId":"1ea6a87c-d31a-4edc-b97d-009a7eeddaef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/178 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/178"},{"claim":"Site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without API key management","Agent-driven pay-per-call workflows using x402 on Base","Exploring x402 protocol integration with USDC micropayments"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-request API access","Projects wanting USDC-settled micropayments on Base"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation before integrating","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.451Z"},"updatedAt":"2026-04-23T01:01:21.992Z"}}