{"id":"48445d4e-e5c2-4f9e-96b2-2904ccaed1ac","shortId":"AFY43t","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource path `/api/v1/messages/178` suggests a messages or content retrieval endpoint, though the exact payload and functionality are not documented beyond the generic label. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required. However, the crawled documentation is extremely thin — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or usage examples.\n\nBecause the specific endpoint `/api/v1/messages/178` does not appear in the site's published API catalog and no request/response schema is documented, the actual behavior and output of this particular resource remain unclear. The x402 challenge is live and well-formed, confirming the endpoint is operational and accepting payments.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-response","no-api-key","post-method"],"categories":["general","api-marketplace"],"synonyms":["premium API","paid API","x402 endpoint","USDC API","Base network API","lowpaymentfee","micropayment API","pay-per-request"],"warnings":["The endpoint /api/v1/messages/178 does not appear in the provider's published API catalog — its purpose is undocumented.","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no technical content.","No request body schema or response schema is available; actual behavior is unknown.","The broader platform lists many API categories but none have detailed documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/178","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/178","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 works. However, there is no documentation for this specific endpoint (/api/v1/messages/178), no request/response schema, no examples, and the site's docs pages are empty. The endpoint path doesn't match any listed API on the site's catalog, making its purpose 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'/api/v1/messages/178':48,196 '/pricing':172 '/readme':174 '/request':13,28 '0.02':12,27,85,148 '000':89 '0x8335':79 '20':88 '2913':80 '6':93 'Base network API' 'USDC API' 'accept':97,239 'access':7,22,38 'actual':214 'addit':185 'advertis':107 'ai/ml':119 'analysi':122 'analyt':118 'api':6,21,37,115,153,205 'appear':199 'application/json':102 'base':9,24,74,90 'behavior':215 'beyond':65 'broader':104 'call':4,19,114 'catalog':206 'challeng':226 'classif':124 'commit':161 'confirm':233 'connect':180 'content':53 'contract':78 'convers':141 'cost':83 'crawl':165 'data':117,127 'decim':94 'document':64,166,187,212 'embed':125 'endpoint':32,55,96,144,195,235 'estim':135 'exact':58 'exampl':191 'exchang':130 'extrem':168 'feed':129 'finance/web3':126 'form':232 'function':61 'gas':134 'generat':142 'generic':67 'geocod':139 'howev':163 'infer':120 'infrastructur':137 'json-response' 'key':154 'label':68 'limit':157 'list':146 'live':228 'lowpaymentfee' 'lowpaymentfee.com':34,105 'messag':51 'micropayment API' 'minimum':160 'network':75 'no-api-key' 'oper':237 'output':217 'page':175 'paid API' 'particular':220 'path':47 'pay':2,17,112 'pay-per-cal':1,16,111 'pay-per-call' 'pay-per-request' 'payload':59 'payment':42,69,240 'per':3,18,86,113,149 'platform':106 'post':98 'post-method' 'premium':5,20,36 'premium API' 'price':128 'prompt':182 'protocol':43 'provid':35 'publish':204 'quot':133 'rate':131,156 'remain':222 'request':87,99,150 'request/response':209 'requir':162 'resourc':46,221 'retriev':54 'return':101,177 'schema':188,210 'sentiment':121 'settl':71 'site':202 'span':116 'specif':45,194 'suggest':49 'suit':109 'summar':123 'technic':186 'thin':169 'though':56 'token':132 'unclear':223 'unit':91 'usag':190 'usdc':15,30,77 'usdc-base' 'use':76 'util':138 'valid':140 'via':10,25,39 'wallet':181 'well':231 'well-form':230 'x402':11,26,41,225 'x402 endpoint' 'x402-payment'","prices":[{"id":"768bdcfb-3f40-4a96-947b-8df78fe4dfee","listingId":"48445d4e-e5c2-4f9e-96b2-2904ccaed1ac","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.510Z"}],"sources":[{"listingId":"48445d4e-e5c2-4f9e-96b2-2904ccaed1ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.510Z","lastSeenAt":"2026-04-22T02:32:07.147Z"}],"details":{"listingId":"48445d4e-e5c2-4f9e-96b2-2904ccaed1ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/178 \\\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":"The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/messages/178"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages /api, /pricing, and /README returned only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Accessing premium content or messages behind a micropaywall","Agent-driven API consumption with per-call USDC payments on Base","Programmatic access to paid resources without API key registration"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing","Quick one-off requests where $0.02/call is acceptable"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume use cases where per-call pricing becomes expensive","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.972Z"},"updatedAt":"2026-04-22T02:32:07.147Z"}}