{"id":"246097ef-14ec-4add-99b7-31e52ef41bd6","shortId":"9z3Lru","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 site hosts a broad catalog of pay-per-call 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, settled in USDC on Base with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/charges/190` is labeled \"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 and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 actually returns. The endpoint is confirmed live (402 challenge captured), but without knowing the concrete functionality behind \"Premium API Access\" or the expected request body, callers will need to experiment or contact the provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","premium access endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found","The specific functionality of /api/v1/charges/190 ('Premium API Access') is undefined — it is unclear what data or service it provides","No request body schema or response examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/190","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/190","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 challenge, but documentation is effectively 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 specific function of /api/v1/charges/190 is 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'/api/v1/charges/190':111 '/docs':170 '/pricing':171 '/readme':174 '0.02':10,24,89,141 '000':128 '0x8335':133 '20':127 '2913':134 '402':211 '6':137 'Base network API' 'USDC API' 'accept':159 'access':6,20,36,116,223 'actual':204 'ai/ml':60 'analysi':63 'analyt':59 'api':5,19,35,56,99,115,222 'application/json':164 'base':8,22,43,96,129,136 'base-network' 'behind':37,220 'bodi':228 'broad':49 'call':55 'caller':229 'captur':213 'catalog':50 'challeng':122,212 'classif':65 'commit':107 'concret':218 'confirm':209 'connect':180 'contact':235 'content':186 'convers':82 'data':58 'decim':138 'document':165,195 'embed':66 'endpoint':30,85,110,158,203,207 'equal':140 'estim':76 'exact':148 'exampl':198 'exchang':71 'expect':226 'experi':233 'extrem':167 'feed':70 'financ':67 'function':219 'gas':75 'gate':3,17 'generat':83 'geocod':80 'header':156 'host':47 'http':160 'http-post' 'includ':151 'infer':61 'infrastructur':78 'json-response' 'key':100 'know':216 'label':113 'limit':103 'live':210 'low payment fee' 'lowpaymentfee.com':32 'made':144 'maxamountrequir':125 'micropayment API' 'minimum':106 'need':231 'network':44 'no-api-key' 'openapi':190 'page':175 'particular':202 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':142,155 'paywal':40 'per':11,25,54,90 'post':161 'premium':4,18,34,114,221 'premium access endpoint' 'price':69,87 'prompt':182 'provid':33,237 'quot':74 'rate':72,102 'render':177 'request':12,26,91,227 'request/response':193 'return':118,163,205 'schema':194 'scheme':149 'sentiment':62 'settl':92 'site':46 'span':57 'spars':168 'spec':191 'specif':109 'summar':64 'token':73 'unit':130 'usdc':14,28,94,132 'usdc-settlement' 'util':79 'valid':81,120 'via':145 'wallet':181 'web3':68 'without':215 'x':154 'x-payment':153 'x402':2,16,39,121,147 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"38936483-b918-4e24-abbe-de31811073c2","listingId":"246097ef-14ec-4add-99b7-31e52ef41bd6","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:36.348Z"}],"sources":[{"listingId":"246097ef-14ec-4add-99b7-31e52ef41bd6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/190","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:36.348Z","lastSeenAt":"2026-04-22T09:01:00.429Z"}],"details":{"listingId":"246097ef-14ec-4add-99b7-31e52ef41bd6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/190 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/190"},{"claim":"Site offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access on Base","Low-cost per-request API consumption without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring well-defined request/response schemas upfront","Non-crypto users who cannot pay in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.971Z"},"updatedAt":"2026-04-22T09:01:00.429Z"}}