{"id":"abeb29ab-be12-48e6-b81e-39e7c8b127df","shortId":"VssDBL","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 is a pay-per-request API platform that uses the x402 protocol to gate access to a broad set of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general utility services. All endpoints settle payments in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/194` is listed as \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge for this endpoint advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" payment scheme, with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The endpoint path (`/api/v1/stripe/charges/194`) suggests it may relate to Stripe charge data or operations, but this is speculative given the lack of documentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","crypto-settlement"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","stripe charges API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The endpoint path '/api/v1/stripe/charges/194' is ambiguous — unclear what it actually does or returns","No example requests or responses are available anywhere in the crawled material","The numeric ID '194' in the path suggests a resource-specific endpoint but its nature is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/194","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/194","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 OpenAPI spec, no documentation of request parameters or response format, and the docs/pricing/README pages are all empty. The purpose of this specific endpoint (/api/v1/stripe/charges/194) is unclear. Effectively a stub 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'/api/v1/stripe/charges/194':86,215 '/docs':176 '/pricing':178 '/readme':180 '/request':16,34,138 '0.02':15,33,125,137 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':114 '20':107 '300':155 '6':120 'Base network API' 'USDC API access' 'accept':94 'access':53,92,169 'across':139 'actual':210 'address':146 'advertis':103,133,160 'ai':9,27 'ai/ml':63 'analyt':8,26,62 'api':4,22,44,91,162 'asset':113 'base':7,25,80,109,116 'broad':56 'challeng':99 'charg':222 'connect':186 'consist':128 'content':192 'crypto-settlement' 'data':61,67,223 'decim':121 'document':171,201,234 'endpoint':13,31,59,73,84,102,141,209,213 'exact':150 'exampl':204 'extrem':173 'financ':10,28 'finance/crypto':65 'flat':134 'gate':3,21,52 'general':69 'given':230 'howev':170 'infer':64 'instant':168 'key':163 'lack':232 'limit':166 'list':88 'lowpaymentfee' 'lowpaymentfee.com':37 'made':144 'market':66 'maxamountrequir':105 'may':218 'micropayment API' 'network':81 'no-api-key' 'openapi':196 'oper':225 'page':181 'particular':208 'path':214 'pay':41 'pay-per-call API' 'pay-per-request':40 'payment':75,142,151 'per':42,126 'platform':45,159 'post':95 'post-endpoint' 'premium':90 'price':135 'prompt':188 'protocol':50 'rate':165 'relat':219 'render':183 'request':43,96,127 'request/response':199 'return':211 'schema':200 'scheme':152 'second':156 'servic':71 'set':57 'settl':74 'sinc':117 'site':131 'span':60 'spars':174 'spec':197 'specif':83 'specul':229 'stripe':221 'stripe charges API' 'substant':191 'suggest':216 'suit':5,23 'timeout':157 'translat':123 'unit':110 'usdc':18,36,77,112,118 'usdc-base' 'use':47,119,148 'util':12,30,70 'via':17,35 'wallet':187 'x402':2,20,49,98 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"302db391-2320-4c50-9d9c-4c9de8ccfa1b","listingId":"abeb29ab-be12-48e6-b81e-39e7c8b127df","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/194","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:24.656Z"}],"sources":[{"listingId":"abeb29ab-be12-48e6-b81e-39e7c8b127df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/194","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:24.656Z","lastSeenAt":"2026-04-23T00:32:07.678Z"}],"details":{"listingId":"abeb29ab-be12-48e6-b81e-39e7c8b127df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/194 \\\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/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 USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/194"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/194"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic access to a gated endpoint via x402 payment protocol"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible clients that can settle USDC on Base","Use cases requiring low-friction, per-call billing without subscriptions"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.579Z"},"updatedAt":"2026-04-23T00:32:07.678Z"}}