{"id":"42a2028e-7669-48b4-ac54-d3bad4cb7e89","shortId":"yzGTUq","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific path `/api/v1/stripe/invoices/20` suggests a Stripe invoice-related resource, though the exact response payload is not documented. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a max amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider's landing page advertises a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. The site emphasizes no API keys, no rate limits, and instant access. However, documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation describing what this specific invoice endpoint accepts or returns, the actual functionality remains unclear. The x402 challenge is live and well-formed, confirming the endpoint is operational and accepting payment via the x402 protocol. The POST method is specified in the outputSchema. Agents should be aware that the lack of input/output documentation makes integration speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 payment endpoint","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All documentation pages (docs, api, pricing, README) return only 'Connect wallet' with no substantive content","Exact request body format and response structure are unknown","The specific purpose of /api/v1/stripe/invoices/20 is not explained anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/20","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/invoices/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational. However, there is no OpenAPI schema, no request/response documentation, and all doc pages return only 'Connect wallet' with no content. The actual functionality of the /stripe/invoices/20 path is undocumented, making this effectively a stub 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'/request':136 '0.02':10,24,84,135 '000':79 '0x8335':71 '20':78 '2913':72 '6':89 'Base network API' 'USDC micropayment API' 'accept':186,209 'access':36,150 'actual':190 'advertis':96 'agent':223 'ai/ml':108 'amount':76 'analyt':107 'api':35,104,143 'awar':226 'base':8,22,66,80 'base-network' 'beyond':154 'broad':98 'catalog':99 'challeng':196 'classif':112 'confirm':203 'connect':161 'content':167 'contract':70 'convers':129 'data':106 'decim':90 'describ':180 'document':60,152,179,232 'embed':113 'emphas':141 'endpoint':6,20,30,185,205 'equal':83 'estim':123 'exact':55 'exampl':176 'exchang':118 'feed':117 'financ':114 'form':202 'function':191 'gas':122 'gate':3,17,103 'generat':130 'geocod':127 'howev':151 'infer':109 'infrastructur':125 'input/output':231 'instant':149 'integr':234 'invoic':5,19,50,184 'invoice-rel':49 'key':144 'lack':229 'land':94,156 'limit':147 'live':198 'lowpaymentfee' 'lowpaymentfee.com':32 'make':233 'max':75 'method':217 'network':67 'no-api-key' 'openapi':172 'oper':207 'outputschema':222 'page':95,153,157 'path':44 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payload':57 'payment':40,61,210 'per':11,25,85 'point':138 'post':216 'premium':34 'price':116,137 'prompt':163 'protocol':41,214 'provid':33,92 'quot':121 'rate':119,146 'relat':51 'remain':192 'request':12,26,86 'request/response':175 'resourc':52 'respons':56 'return':158,188 'schema':173 'sentiment':110 'settl':63 'site':140 'span':105 'specif':43,183 'specifi':219 'specul':235 'stripe':4,18,48 'stripe invoice API' 'stripe-invoices' 'substant':166 'suggest':46 'summar':111 'though':53 'token':120 'unclear':193 'unit':81 'usdc':14,28,69,87 'usdc-settlement' 'use':68,88 'util':126 'valid':128 'via':37,211 'wallet':162 'web3':115 'well':201 'well-form':200 'x402':2,16,39,102,195,213 'x402 payment endpoint' 'x402-gated':1,15,101 'x402-payment'","prices":[{"id":"75e38633-5bff-4cd8-a591-b689023d0763","listingId":"42a2028e-7669-48b4-ac54-d3bad4cb7e89","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/invoices/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:55.908Z"}],"sources":[{"listingId":"42a2028e-7669-48b4-ac54-d3bad4cb7e89","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:55.908Z","lastSeenAt":"2026-04-25T08:33:11.514Z"}],"details":{"listingId":"42a2028e-7669-48b4-ac54-d3bad4cb7e89","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/20 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/20"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/20"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically accessing Stripe invoice data via x402 micropayment","Integrating pay-per-request invoice lookups into agent workflows","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Agents needing x402-compatible invoice endpoints on Base","Developers exploring x402 protocol integrations","Low-cost per-request API access without API key management"],"notFor":["Production invoice workflows requiring documented schemas and SLAs","Use cases needing detailed Stripe invoice manipulation (create, update, void)","Applications requiring guaranteed uptime and rate limit transparency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.187Z"},"updatedAt":"2026-04-25T08:33:11.514Z"}}