{"id":"387b5a39-7d89-463c-9210-1ad58207faf8","shortId":"P6Z4xW","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/inbox/19` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme — no API keys, no subscriptions, just a per-call crypto payment.\n\nThe broader platform advertises four categories of endpoints: 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 are listed at the same $0.02/request price point. The platform claims no API keys, no rate limits, and instant access.\n\nNote that the specific endpoint being listed here (`/api/v1/inbox/19`) does not clearly map to any of the named API categories on the landing page. Its exact functionality is unknown — the description is simply \"Premium API Access\" with no further documentation, no OpenAPI schema, and no example request/response. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Treat this endpoint as live but poorly documented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["The endpoint path /api/v1/inbox/19 does not match any of the documented API categories on the landing page — its actual functionality is unknown.","No OpenAPI spec, no request/response examples, and no meaningful documentation available.","Docs, pricing, and README pages all returned only a 'Connect wallet' prompt with no content.","The platform's claims (no rate limits, instant access, etc.) are unverifiable from the crawl data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/19","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/inbox/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no OpenAPI schema, no documentation beyond a generic title, no example requests or responses, and the specific endpoint path (/api/v1/inbox/19) doesn't correspond to any named service on the landing page. Effectively a stub 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'/request':17,36,158 '0.02':16,35,78,157 '000':82 '20':81 '6':88 'Base network API' 'USDC API' 'access':73,172,208 'addit':236 'advertis':113 'ai':10,29,125 'analysi':129 'analyt':119 'api':4,23,45,72,99,165,191,207 'base':7,26,61,83 'base-network' 'behind':53 'broader':111 'call':80,107 'categori':115,192 'claim':163 'classif':132 'clear':184 'connect':231 'content':237 'convers':149 'cost':75 'crawl':221 'crypto':108 'data':9,28,118,122 'decim':89 'descript':203 'doc':222 'document':212,245 'embed':133 'endpoint':14,33,52,65,117,177,240 'estim':143 'exact':96,198 'exampl':218 'exchang':138 'export':123 'feed':137 'financ':11,30,134 'four':114 'function':199 'gas':142 'gate':3,22,48 'generat':150 'geocod':147 'infrastructur':145 'insight':124 'instant':171 'json-response' 'key':100,166 'land':195 'learn':127 'limit':169 'list':69,153,179 'live':242 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':126 'made':92 'map':185 'marketplac':46 'metric':120 'micropay':58 'micropayment API' 'name':190 'network':62 'no-api-key' 'note':173 'offer':8,27 'openapi':214 'page':196,226 'pay-per-call API' 'payment':90,109 'per':55,79,106 'per-cal':105 'per-request':54 'per-request-billing' 'platform':5,24,112,162 'point':160 'poor':244 'premium':71,206 'price':136,159,223 'prompt':233 'protocol':44 'quot':141 'rate':139,168 'readm':225 'report':121 'request':56 'request/response':219 'return':228 'schema':215 'scheme':97 'sentiment':128 'simpli':205 'specif':64,176 'subscript':102 'summar':131 'text':130 'token':140 'treat':238 'unit':84 'unknown':201 'usdc':19,38,57,86 'usdc-micropayment' 'util':13,32,146 'valid':148 'varieti':50 'via':18,37,93 'wallet':232 'web3':135 'x402':2,21,43,95 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"e70c8c70-66f0-4627-bb86-f881f4a1039c","listingId":"387b5a39-7d89-463c-9210-1ad58207faf8","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/inbox/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.778Z"}],"sources":[{"listingId":"387b5a39-7d89-463c-9210-1ad58207faf8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.778Z","lastSeenAt":"2026-04-22T07:32:24.419Z"}],"details":{"listingId":"387b5a39-7d89-463c-9210-1ad58207faf8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/19 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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/inbox/19"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/19"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform claims no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-request API without needing API keys or subscriptions","Agent-driven workflows that settle per-call costs in USDC on Base","Exploring x402-protocol micropayment patterns for API monetization"],"bestFor":["Developers experimenting with x402 micropayment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, per-request API billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","Production workloads requiring well-documented, schema-validated endpoints"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.376Z"},"updatedAt":"2026-04-22T07:32:24.419Z"}}