{"id":"71d2f32f-2a98-446b-bb5f-7944e1e78288","shortId":"mvzt4U","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/166` is labeled \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint categories: 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 listed endpoints share the same $0.02/request pricing. The platform claims no rate limits and instant access.\n\nImportant caveat: the specific `/api/v1/messages/166` endpoint's actual functionality is unclear. The path pattern (\"messages/166\") does not correspond to any of the documented API categories on the landing page, and no OpenAPI schema, request/response examples, or detailed documentation were found. The endpoint is confirmed live (returns a valid 402 challenge), but what it returns after payment is unknown. Treat this as a low-documentation endpoint until more information is available.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["general","api-gateway"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The path /api/v1/messages/166 does not match any documented API category on the provider's landing page — actual functionality is unknown","No request body schema or response examples found; what the endpoint returns after payment is unclear","Pricing and /README pages returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/166","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/messages/166","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 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/messages/166 actually does. The path does not match any documented category on the landing page. Pricing is clear ($0.02 USDC on Base), but the lack of functional documentation makes this effectively a 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'/request':19,38,166 '0.02':18,37,79,165 '000':83 '20':82 '402':225 '402 payment api' '6':89 'access':74,176 'account':101 'actual':184 'advertis':122 'ai':12,31,133 'analysi':137 'analyt':127 'api':5,24,45,73,99,200 'attach':108 'avail':247 'base':8,27,63,84 'base network api' 'broad':50 'call':4,23,81 'caller':106 'catalog':51 'categori':125,201 'caveat':178 'challeng':226 'claim':170 'classif':140 'confirm':220 'convers':157 'correspond':194 'cost':76 'data':11,30,126,130 'decim':90 'detail':213 'document':199,214,241 'embed':141 'enabl':44 'endpoint':16,35,57,67,124,161,182,218,242 'estim':151 'exampl':211 'exchang':146 'export':131 'feed':145 'financ':13,32,142 'found':216 'four':123 'function':185 'gas':150 'generat':158 'geocod':155 'handl':93 'header':113 'import':177 'inform':245 'infrastructur':153 'insight':132 'instant':175 'json-response' 'key':100 'label':71 'land':204 'learn':135 'limit':173 'list':160 'live':221 'low':240 'low payment fee' 'low-document':239 'lowpaymentfee.com':39 'machin':134 'messages/166':191 'metric':128 'micropayment api' 'network':64 'no-api-key' 'offer':10,29 'openapi':208 'page':205 'path':189 'pattern':190 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,112,117,232 'per':3,22,55,80 'platform':6,25,46,121,169 'post-method' 'premium':72 'price':144,167 'proof':118 'protocol':97 'provid':48 'quot':149 'rate':147,172 'report':129 'request':56 'request/response':210 'requir':105 'return':222,230 'schema':209 'sentiment':136 'settl':58 'share':162 'simpli':107 'specif':66,180 'subscript':103 'summar':139 'text':138 'token':148 'treat':235 'unclear':187 'unit':85 'unknown':234 'usdc':9,28,60,87 'usdc api' 'usdc-base-network' 'util':15,34,154 'valid':116,156,224 'via':94 'web3':143 'wider':120 'x':111 'x-payment':110 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5b405a79-07ae-4f43-88b9-c60173ca30cd","listingId":"71d2f32f-2a98-446b-bb5f-7944e1e78288","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/messages/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.281Z"}],"sources":[{"listingId":"71d2f32f-2a98-446b-bb5f-7944e1e78288","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.281Z","lastSeenAt":"2026-04-22T02:32:06.614Z"}],"details":{"listingId":"71d2f32f-2a98-446b-bb5f-7944e1e78288","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/166 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/166"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/166"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or accounts","Agent-driven workflows that need to pay for API access on-the-fly using USDC on Base","Exploring x402-protocol-based API monetization"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agents on the Base network","Low-volume or sporadic API consumers who prefer per-call billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.307Z"},"updatedAt":"2026-04-22T02:32:06.614Z"}}