{"id":"34d2cf01-6c3d-41d5-97a0-1478af32b63b","shortId":"Sdsksg","kind":"x402","title":"Pay-per-call API platform on Base (USDC) — $0.02/request, no keys or rate limits.","tagline":"Pay-per-call API platform on Base (USDC) — $0.02/request, no keys or rate limits.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility/infrastructure services. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/inbox/107` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nNote that while the platform advertises many endpoint categories (sentiment analysis, text summarization, embeddings, price feeds, geocoding, etc.), there is no public documentation describing request/response schemas for any individual endpoint, including this one. The \"inbox/107\" path does not map to any of the named endpoints on the landing page, so its exact functionality is unclear. Treat this as a generic entry point whose behavior must be discovered by calling it with a valid payment.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","post-endpoint"],"categories":["api-platform","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-request API","USDC API","Base network API"],"warnings":["No documentation exists for the /api/v1/inbox/107 endpoint — its purpose is unknown","No request or response schema is available for any endpoint on the platform","The 'inbox/107' path does not correspond to any of the named API categories on the landing page","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/107","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/107","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/v1/inbox/107 actually does, no request/response schema, and no examples. The 'inbox/107' path doesn't match any named endpoint on the site. This is effectively a stub 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'/request':11,27 '0.02':10,26,61,126 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':121 '20':115 '300':140 '402':110 '6':129 'Base network API' 'USDC API' 'accept':145 'access':106 'address':136 'advertis':156 'ai/ml':51 'analysi':161 'analyt':50 'api':5,21,39,78,105 'application/json':150 'attach':89 'base':8,24,69,117,123 'behavior':214 'broad':44 'call':4,20,219 'caller':87 'catalog':45 'categori':159 'challeng':111 'commit':86 'cost':60 'data':49,54 'decim':130 'describ':174 'discov':217 'document':173 'embed':164 'enabl':38 'endpoint':47,59,99,144,158,180,195 'entri':211 'equal':125 'etc':168 'everi':58 'exact':202 'feed':166 'finance/web3':53 'function':203 'generic':210 'geocod':167 'header':93 'inbox/107':185 'includ':181 'individu':179 'infer':52 'json-api' 'key':13,29,79 'land':198 'limit':16,32,82 'list':102 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'mani':157 'map':189 'micropayment API' 'minimum':85 'must':215 'name':194 'network':70 'note':151 'offer':42 'one':183 'page':199 'paid':64 'path':186 'pay':2,18 'pay-per-cal':1,17 'pay-per-call' 'pay-per-request API' 'payment':92,132,224 'per':3,19,62 'platform':6,22,40,155 'point':212 'post':146 'post-endpoint' 'premium':104 'price':165 'protocol':74 'public':172 'rate':15,31,81 'request':63,96,112,147 'request/response':175 'return':108,149 'schema':176 'second':141 'sent':134 'sentiment':160 'servic':57 'simpli':88 'span':48 'specif':98 'summar':163 'text':162 'timeout':142 'treat':206 'unclear':205 'unit':118 'usdc':9,25,66,120,127 'usdc-base' 'use':128 'utility/infrastructure':56 'valid':223 'via':71 'whose':213 'x402':37,73,91 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"0b72ba43-6951-4b17-932c-e6f5f163a78f","listingId":"34d2cf01-6c3d-41d5-97a0-1478af32b63b","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/107","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.154Z"}],"sources":[{"listingId":"34d2cf01-6c3d-41d5-97a0-1478af32b63b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/107","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.154Z","lastSeenAt":"2026-04-22T02:31:58.981Z"}],"details":{"listingId":"34d2cf01-6c3d-41d5-97a0-1478af32b63b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/107 \\\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":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge for /api/v1/inbox/107 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/107"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without managing API keys","Agent-driven workflows that need on-demand, per-call billing via x402","Exploring x402 payment protocol integration with USDC on Base"],"bestFor":["Developers experimenting with x402 micropayment protocols","AI agents that need keyless, pay-as-you-go API access","Projects wanting to avoid subscription commitments for low-volume API usage"],"notFor":["Production workloads requiring well-documented, schema-validated APIs","Users who need free or traditional API-key-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.519Z"},"updatedAt":"2026-04-22T02:31:58.981Z"}}