{"id":"45594705-4c8f-4fdf-8488-4af11e32c10e","shortId":"VEj73V","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates a broad catalog of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/claims/89` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\n\nThe provider's landing page advertises four categories of APIs: 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 are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 documentation for any endpoint, including the `/api/v1/claims/89` endpoint being listed here. The purpose of the `/claims/89` resource specifically is unclear; it does not appear in the site's catalog of named endpoints, so its actual functionality cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response"],"categories":["api-platform","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","Base USDC API","pay-per-request API","claims endpoint"],"warnings":["No OpenAPI schema or endpoint documentation available","The /claims/89 path does not appear in the provider's listed API catalog — its actual functionality is unknown","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no content","No request body schema or response schema available — callers cannot know what to send or expect back"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/89","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/claims/89","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 no documentation, no OpenAPI schema, no request/response examples, and the specific /claims/89 resource is not described anywhere on the site. The purpose of this particular endpoint is 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'/api/v1/claims/89':65,208 '/claims/89':217 '/docs':174 '/pricing':176 '/readme':178 '/request':17,34 '0.02':16,33,98,155 '000':87 '0x8335':92 '20':86 '2913':93 '6':104 'Base USDC API' 'accept':73 'access':71 'actual':236 'advertis':111 'ai':10,27,123 'amount':83 'analysi':127 'analyt':117 'api':4,21,41,70,115,160 'appear':225 'avail':242 'base':7,24,60,88,95 'behind':50 'broad':46 'cannot':238 'catalog':47,230 'categori':113 'challeng':80 'claims endpoint' 'classif':130 'commit':168 'confirm':240 'connect':184 'content':190 'convers':147 'data':9,26,116,120 'decim':105 'detail':201 'document':169,202 'embed':131 'endpoint':14,31,49,64,151,205,209,233 'equal':97 'estim':141 'exampl':198 'exchang':136 'export':121 'extrem':171 'feed':135 'financ':11,28,132 'four':112 'function':237 'gas':140 'gate':3,20,44 'generat':148 'geocod':145 'given':101 'includ':206 'infrastructur':143 'insight':122 'json-response' 'key':161 'land':109 'learn':125 'limit':164 'list':67,150,211 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'materi':243 'maximum':82 'metric':118 'micropay':54 'minimum':167 'name':232 'network':61 'offer':8,25 'openapi':194 'page':110,179 'pay-per-request API' 'payment':79 'per':52,99,156 'per-request':51 'per-request-micropayment' 'platform':5,22,42 'post':74 'post-endpoint' 'premium':69 'price':134,153 'prompt':186 'protocol':40 'provid':107 'purpos':214 'quot':139 'rate':137,163 'render':181 'report':119 'request':53,75,100,157 'request/response':197 'requir':84 'resourc':218 'schema':195 'sentiment':126 'settl':55 'site':228 'spars':172 'specif':63,219 'summar':129 'text':128 'token':138 'unclear':221 'unit':89 'usdc':57,91,102 'usdc-base' 'util':13,30,144 'valid':146 'wallet':185 'web3':133 'x402':2,19,39,78 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"8108ef44-69d4-48b6-b6cb-f375f8aa326e","listingId":"45594705-4c8f-4fdf-8488-4af11e32c10e","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/claims/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:59.154Z"}],"sources":[{"listingId":"45594705-4c8f-4fdf-8488-4af11e32c10e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:59.154Z","lastSeenAt":"2026-04-24T09:32:10.110Z"}],"details":{"listingId":"45594705-4c8f-4fdf-8488-4af11e32c10e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/89 \\\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 endpoint returns a 402 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/claims/89"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/89"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without API keys or subscriptions","Integrating x402-compatible agents with micropayment-gated services","Accessing premium claim data via programmatic POST requests"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","x402-compatible AI agents that can settle USDC on Base","Prototyping with low-cost per-request pricing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.96Z"},"updatedAt":"2026-04-24T09:32:10.110Z"}}