{"id":"f20e7ee9-7d0e-4636-8b57-b1ab06bb4824","shortId":"ashrAR","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/234` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four 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 endpoints are listed at the same $0.02/request price point.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/charges/234` endpoint actually returns. The endpoint is live and responds with a well-formed x402 challenge, but without documentation it is unclear what input the POST body expects or what output it produces.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance","ai"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema describing request/response formats for this endpoint","The purpose of /api/v1/charges/234 ('Premium API Access') is not explained anywhere","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/234","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/charges/234","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, confirming it accepts USDC on Base at $0.02/request. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint does beyond the generic label 'Premium API Access'. The listing is essentially a 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'/api/v1/charges/234':56,196 '/docs':164 '/pricing':165 '/readme':168 '/request':13,28,156 '0.02':12,27,78,155 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92 'across':112 'actual':198 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85 'attach':95 'base':8,23,51,73 'base network api' 'bodi':223 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67,212 'classif':129 'connect':174 'content':180 'convers':146 'data':115,119 'descript':192 'detail':191 'document':159,215 'embed':130 'endpoint':55,111,149,197,201 'estim':140 'exampl':188 'exchang':135 'expect':224 'export':120 'extrem':161 'feed':134 'financ':131 'form':210 'four':113 'gas':139 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'input':220 'insight':121 'instant':91 'json-response' 'key':86 'learn':124 'limit':89 'list':58,151 'live':203 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'openapi':184 'output':227 'page':169 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'post':222 'post-endpoint' 'premium':60 'price':133,157 'produc':229 'prompt':176 'proof':106 'protocol':44 'quot':138 'rate':88,136 'render':171 'report':118 'request':37,68 'request/response':187 'respond':205 'return':64,199 'schema':185 'sentiment':125 'simpli':94 'spars':162 'specif':54 'summar':128 'text':127 'token':137 'unclear':218 'unit':74 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':175 'web3':132 'well':209 'well-form':208 'without':214 'x':98 'x-payment':97 'x402':11,26,43,104,211 'x402 api' 'x402-payment'","prices":[{"id":"c3ecd037-aeb5-468a-9c9b-c70f578ca605","listingId":"f20e7ee9-7d0e-4636-8b57-b1ab06bb4824","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/charges/234","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:36.916Z"}],"sources":[{"listingId":"f20e7ee9-7d0e-4636-8b57-b1ab06bb4824","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/234","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:36.916Z","lastSeenAt":"2026-04-22T16:31:14.125Z"}],"details":{"listingId":"f20e7ee9-7d0e-4636-8b57-b1ab06bb4824","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/234 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/234"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/234"}],"useCases":["Programmatic access to data analytics, AI inference, finance, or utility endpoints with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting keyless, pay-as-you-go API access","x402 protocol experimentation on Base with USDC","Low-cost per-request micropayment workflows"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-throughput production workloads where $0.02/request adds up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.89Z"},"updatedAt":"2026-04-22T16:31:14.125Z"}}