{"id":"0c82eea4-d0a8-4215-8097-1b3db9220e15","shortId":"3y9Rcd","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per 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-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 the Base network.\n\nThe specific endpoint `/api/v1/charges/232` is labeled \"Premium API Access\" and accepts POST requests. It returns an x402 challenge requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by per-request micropayment.\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 this particular endpoint actually returns. The site's landing page lists many endpoints but does not clarify what `/api/v1/charges/232` specifically provides versus the other listed routes. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-call","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-gated API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/charges/232 ('Premium API Access') is not described anywhere; it is unclear what data or service it returns.","No OpenAPI schema, no request body schema, and no response examples are provided.","The site lists many endpoints but none have detailed documentation visible in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/232","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/232","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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The actual functionality of /api/v1/charges/232 is entirely undocumented, making this effectively a stub 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'0.02':12,28,90,135 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':129 '20':123 '2913':130 '300':149 '6':139 'Base network API' 'USDC pay-per-call' 'accept':110 'access':7,23,40,108,160 'actual':208,238 'address':145 'advertis':159 'ai/ml':61 'analysi':64 'analyt':60 'api':6,22,39,57,107,153,175 'awar':235 'base':9,25,98,125,132 'base-network' 'behind':240 'broad':50 'call':4,20,56 'catalog':51 'challeng':117 'clarifi':221 'classif':66 'connect':184 'content':190 'convers':83 'crypto-gated API' 'data':59,204 'decim':140 'descript':201 'doc':174 'document':169 'embed':67 'endpoint':34,86,102,207,217,242 'equal':134 'estim':77 'exact':120 'exampl':198 'exchang':72 'extrem':171 'feed':71 'financ':68 'function':239 'gas':76 'gate':162 'generat':84 'geocod':81 'given':136 'host':48 'infer':62 'infrastructur':79 'key':154 'label':105 'land':213 'limit':157 'list':215,229 'lowpaymentfee' 'lowpaymentfee.com':36 'mani':216 'micropay':168 'micropayment API' 'network':99 'no-api-key' 'openapi':194 'page':179,214 'particular':206 'pay':2,18,54 'pay-per-cal':1,17,53 'pay-per-call' 'payment':44,121,141 'per':3,13,19,29,55,91,166 'per-request':165 'post':111 'post-endpoint' 'premium':5,21,38,106 'premium API access' 'price':70,88,176 'prompt':186 'prospect':231 'protocol':45 'provid':37,225 'pure':163 'quot':75 'rate':73,156 'readm':178 'render':181 'request':14,30,92,112,167 'request/response':197 'requir':118 'return':114,209 'rout':230 'schema':195 'second':150 'sent':143 'sentiment':63 'settl':93 'site':47,211 'span':58 'spars':172 'specif':101,224 'summar':65 'timeout':151 'token':74 'undocu':244 'unit':126 'usdc':16,32,95,128,137 'usdc-micropayment' 'user':232 'util':80 'valid':82 'versus':226 'via':10,26,41 'wallet':185 'web3':69 'x402':11,27,43,116 'x402 API' 'x402-payment'","prices":[{"id":"db813c9f-b8e0-4cc6-ab5a-918504c3e975","listingId":"0c82eea4-d0a8-4215-8097-1b3db9220e15","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/232","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:40.547Z"}],"sources":[{"listingId":"0c82eea4-d0a8-4215-8097-1b3db9220e15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/232","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:40.547Z","lastSeenAt":"2026-04-24T03:03:08.873Z"}],"details":{"listingId":"0c82eea4-d0a8-4215-8097-1b3db9220e15","quickStartSnippet":"# 1. Send a POST to get the x402 payment challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/232\n# Returns 402 with x402 challenge JSON.\n# 2. Construct and attach X-PAYMENT header per x402 spec,\n#    paying 20000 base-units USDC ($0.02) on Base to\n#    0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3\n# 3. Resend the POST with the payment header to receive the response.","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 requiring 20,000 base-units of USDC on Base ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/charges/232"},{"claim":"All listed APIs 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 site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/232"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access settled in USDC on Base","AI agents that can handle x402 payment challenges autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.777Z"},"updatedAt":"2026-04-24T03:03:08.873Z"}}