{"id":"597f2b00-c789-4956-9403-1ed0ce78f6db","shortId":"AeTXZA","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/inbox/64` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe 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.\n\nImportant caveat: the specific `/api/v1/inbox/64` endpoint does not correspond to any of the named endpoints on the landing page. Its purpose and response format are unclear — the description simply says \"Premium API Access\" with no further documentation. There is no OpenAPI spec, no request/response examples, and the docs, pricing, and README pages all resolve to a wallet-connect prompt with no additional content. Treat this endpoint with caution until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The /api/v1/inbox/64 path does not match any documented endpoint on the landing page — its purpose is unknown.","No OpenAPI spec, request schema, or response examples are available.","Docs, pricing, and README pages all resolve to a wallet-connect prompt with no content.","The platform lists many endpoint categories but none have detailed documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/64","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation of request/response formats, and the /inbox/64 path doesn't match any named endpoint on the site. Effectively a stub 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'/request':19,38,158 '0.02':18,37,80,157 '000':84 '20':83 '402 payment api' '6':90 'access':75,192 'addit':222 'advertis':114 'ai':12,31,125 'analysi':129 'analyt':119 'api':5,24,45,74,93,191 'attach':104 'base':8,27,63,85 'base network api' 'base-network' 'broad':50 'call':4,23,82 'caller':102 'catalog':51 'categori':117 'caution':228 'caveat':161 'classif':132 'commit':99 'connect':218 'content':223 'convers':149 'correspond':168 'cost':77 'data':11,30,118,122 'decim':91 'descript':187 'doc':207 'document':196,231 'embed':133 'enabl':44 'endpoint':16,35,57,67,116,153,165,174,226 'estim':143 'exampl':204 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'format':183 'four':115 'gas':142 'generat':150 'geocod':147 'header':108 'import':160 'infrastructur':145 'insight':124 'json-response' 'key':94 'land':177 'learn':127 'limit':96 'list':71,152 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'metric':120 'micropayment api' 'name':173 'network':64 'no-api-key' 'offer':10,29 'openapi':200 'page':178,211 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':107 'per':3,22,55,81 'platform':6,25,46,113 'post-method' 'premium':73,190 'price':136,159,208 'prompt':219 'provid':48 'purpos':180 'quot':141 'rate':95,139 'readm':210 'report':121 'request':56,111 'request/response':203 'requir':101 'resolv':213 'respons':182 'say':189 'sentiment':128 'settl':58 'share':154 'simpli':103,188 'spec':201 'specif':66,163 'summar':131 'surfac':232 'text':130 'token':140 'treat':224 'unclear':185 'unit':86 'upfront':98 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,146 'valid':148 'wallet':217 'wallet-connect':216 'web3':135 'x402':43,106 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"288ea654-2510-4401-bc8e-568071074814","listingId":"597f2b00-c789-4956-9403-1ed0ce78f6db","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.723Z"}],"sources":[{"listingId":"597f2b00-c789-4956-9403-1ed0ce78f6db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.723Z","lastSeenAt":"2026-04-22T04:02:46.155Z"}],"details":{"listingId":"597f2b00-c789-4956-9403-1ed0ce78f6db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/64 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/64","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"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/64"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/64"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a generic premium API endpoint via x402 micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless pay-per-call API access without credentials","Low-volume consumers who want no subscription or rate-limit constraints"],"notFor":["Users who need well-documented, schema-defined API contracts","High-volume production workloads requiring SLAs or support","Anyone needing clarity on what the /inbox/64 endpoint actually returns"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.962Z"},"updatedAt":"2026-04-22T04:02:46.155Z"}}