{"id":"67e56085-ffb9-42ea-ba3e-8964f62be957","shortId":"JGLQy7","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 specific endpoint `/api/v1/charges/176` is one of many offered by the provider, which hosts a broad catalog of pay-per-call 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).\n\nPayment is settled in USDC (USD Coin) on Base via the x402 exact-payment scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The provider advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment proof to each call.\n\nNote that the specific functionality behind `/api/v1/charges/176` is labeled only as \"Premium API Access\" with no further documentation on what data or service it returns. The docs, pricing, and README pages on the site all render only a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the lack of documentation makes it difficult to know what to send or what to expect back.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","pay-per-call"],"synonyms":["premium API","x402 API","USDC pay-per-call","lowpaymentfee","Base network API","micropayment API","402 payment required API"],"warnings":["No documentation available for what /api/v1/charges/176 actually returns","No OpenAPI or schema definition found","Docs, pricing, and README pages render only a wallet-connect prompt with no content","The specific functionality behind 'Premium API Access' is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/176","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/176","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation on what the endpoint actually does, no OpenAPI spec, no request/response schemas, and no examples. The docs/pricing/README pages are empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed 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'0.02':10,24,128 '000':119 '20':118 '402':227 '402 payment required API' '6':124 'Base network API' 'USDC pay-per-call' 'access':6,20,36,142,173 'addit':204 'advertis':133 'ai':71 'amount':115 'analysi':75 'analyt':70 'api':5,19,35,67,135,172 'attach':145 'avail':220 'back':250 'base':8,22,43,105,120 'base-network' 'behind':37,165 'broad':60 'call':66,159 'catalog':61 'challeng':232 'classif':78 'coin':103 'confirm':224 'connect':200 'convers':95 'data':69,180 'decim':125 'detail':206 'difficult':240 'doc':186 'document':177,215,237 'embed':79 'endpoint':30,47,222 'equal':127 'estim':89 'exact':110 'exact-pay':109 'exampl':218 'exchang':84 'expect':249 'feed':83 'financ':80 'function':164 'gas':88 'gate':3,17 'generat':96 'geocod':93 'header':150 'host':58 'infrastructur':91 'instant':141 'json-response' 'key':136 'know':242 'label':168 'lack':235 'learn':73 'limit':139 'live':225 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':72 'make':238 'mani':52 'maximum':114 'micropayment API' 'network':44 'no-api-key' 'note':160 'offer':53 'one':50 'openapi':210 'page':190 'pay':9,23,64 'pay-per-cal':63 'pay-per-request' 'payload':219 'payment':97,111,149,155 'paywal':40 'per':11,25,65,129 'premium':4,18,34,171 'premium API' 'price':82,187 'prompt':201 'proof':156 'provid':33,56,132 'quot':87 'rate':85,138 'readm':189 'render':195 'request':12,26,130 'request/response':213 'requir':116 'return':184,226 'schema':214 'scheme':112 'send':245 'sentiment':74 'servic':182 'settl':99 'simpli':144 'site':193 'span':68 'spec':211 'specif':46,163 'summar':77 'technic':205 'text':76 'token':86 'unit':121 'usd':102 'usdc':14,28,101,123 'usdc-settlement' 'util':92 'valid':94,153,230 'via':106 'wallet':199 'wallet-connect':198 'web3':81 'x':148 'x-payment':147 'x402':2,16,39,108,154,231 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a31395f9-d6b0-443c-8597-6def5ce1f8f1","listingId":"67e56085-ffb9-42ea-ba3e-8964f62be957","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/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:19.440Z"}],"sources":[{"listingId":"67e56085-ffb9-42ea-ba3e-8964f62be957","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/176","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:19.440Z","lastSeenAt":"2026-04-24T05:32:02.932Z"}],"details":{"listingId":"67e56085-ffb9-42ea-ba3e-8964f62be957","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/176 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/176"},{"claim":"The provider lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"The provider advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/176"}],"useCases":["Programmatic access to a premium API endpoint with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Demonstrating x402 payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need keyless, pay-as-you-go API access","Low-cost per-call API consumption settled in USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume batch processing where per-request costs add up without volume discounts","Anyone who cannot transact in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.755Z"},"updatedAt":"2026-04-24T05:32:02.932Z"}}