{"id":"8826dab4-ac50-4c1c-83c7-2ca10b83407d","shortId":"pPD7Nw","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/stripe/charges/92` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain to address 0x1A2B…85F3 using the \"exact\" scheme, with a 300-second timeout.\n\nThe broader platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), 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). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 usage examples available from the crawl. The specific functionality behind the `/api/v1/stripe/charges/92` path is unclear; the name \"Premium API Access\" and the path segment \"stripe/charges\" suggest it may relate to Stripe charge creation or lookup, but this is unconfirmed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","on-chain-settlement","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","stripe charges API","crypto-gated endpoint"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/stripe/charges/92 is unclear — the path suggests Stripe charge operations but this is unconfirmed","No request body schema or response format documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/92","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/stripe/charges/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, no examples, and the docs pages are empty. The actual functionality behind this specific endpoint path is 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'/api/v1/stripe/charges/92':61,221 '/docs':181 '/pricing':183 '/readme':185 '/request':16,34 '0.02':15,33,89,161 '000':84 '0x1a2b':104 '0x8335':74 '20':83 '2913':75 '300':112 '6':94 '85f3':105 'Base network API' 'USDC micropayment API' 'accept':69 'access':67,229 'addit':196 'address':103 'advertis':118 'ai':9,27,130 'amount':81 'analysi':134 'analyt':8,26,124 'api':4,22,46,66,122,166,228 'avail':212 'base':7,25,55,77,85 'behind':219 'broader':116 'call':45 'categori':120 'chain':101 'charg':241 'classif':137 'collect':40 'commit':174 'connect':191 'content':198 'contract':73 'convers':154 'crawl':215 'creation':242 'crypto-gated endpoint' 'data':123,127 'decim':95 'document':176,207 'embed':138 'endpoint':13,31,47,59,157 'equal':88 'estim':148 'exact':108 'exampl':211 'exchang':143 'export':128 'extrem':178 'feed':142 'financ':10,28,139 'four':119 'function':218 'gas':147 'gate':3,21,48 'generat':155 'geocod':152 'host':38 'http-post' 'infrastructur':150 'insight':129 'key':167 'learn':132 'limit':170 'list':63,159 'lookup':244 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':131 'maximum':80 'may':237 'metric':125 'minimum':173 'name':226 'network':56 'no-api-key' 'on-chain':99 'on-chain-settlement' 'openapi':202 'page':186 'path':222,232 'pay':43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':70,96 'per':44,90,162 'platform':117 'premium':65,227 'price':141 'prompt':193 'protocol':52 'quot':146 'rate':144,169 'relat':238 'render':188 'report':126 'request':91,163 'request/response':205 'requir':175 'schema':206 'scheme':109 'second':113 'segment':233 'sentiment':133 'settl':98 'spars':179 'spec':203 'specif':58,217 'stripe':240 'stripe charges API' 'stripe/charges':234 'suggest':235 'suit':5,23 'summar':136 'technic':197 'text':135 'timeout':114 'token':145 'unclear':224 'unconfirm':248 'unit':86 'usag':210 'usdc':18,36,72,92 'usdc-base' 'use':93,106 'util':12,30,151 'valid':153 'via':17,35 'wallet':192 'web3':140 'x402':2,20,51 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"89819fbe-6dc3-4391-9242-1bdd073a824b","listingId":"8826dab4-ac50-4c1c-83c7-2ca10b83407d","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/stripe/charges/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:25.834Z"}],"sources":[{"listingId":"8826dab4-ac50-4c1c-83c7-2ca10b83407d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:25.834Z","lastSeenAt":"2026-04-22T23:01:56.202Z"}],"details":{"listingId":"8826dab4-ac50-4c1c-83c7-2ca10b83407d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/92 \\\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 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/92"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs 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/stripe/charges/92"}],"useCases":["Programmatic access to premium API functionality without traditional API key management","Agent-driven workflows that need on-chain pay-per-call billing on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","AI agents that need keyless, pay-per-request API access","Low-cost micropayment API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput production workloads requiring SLA guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.497Z"},"updatedAt":"2026-04-22T23:01:56.202Z"}}