{"id":"abc8b09c-c0dd-405b-bb03-3399fec8ba9e","shortId":"JjC2zC","kind":"x402","title":"Query GRT wallet balance on Base via x402 micropayment — $0.02 per request in USDC.","tagline":"Query GRT wallet balance on Base via x402 micropayment — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for the GRT (The Graph) token. It is part of a broader suite of pay-per-call APIs offered by the provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are gated behind the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/GRT/balance` accepts POST requests and returns JSON. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made via the \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (402 challenge captured), but the actual response format for a successful paid call is unknown.","tags":[],"capabilities":["wallet-balance","grt-token","x402-payment","usdc-settlement","base-network","pay-per-request","crypto-data"],"categories":["crypto","finance"],"synonyms":["GRT balance","The Graph wallet balance","token balance API","crypto wallet balance","GRT balance check","x402 crypto API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All non-homepage pages (docs, API, pricing, README) render only 'Connect wallet' with no content","Cannot confirm what request body fields are expected or what the response looks like after successful payment","The provider lists many diverse API categories (AI, analytics, finance, infrastructure) at a uniform $0.02 price with no visible documentation, which may indicate an early-stage or placeholder service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/GRT/balance","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/wallet/GRT/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and no OpenAPI spec. The actual behavior after payment is entirely unknown from available 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'0.02':10,24,116 '000':103 '0x8335':108 '20':102 '2913':109 '300':128 '402':196 '6':112 'GRT balance' 'GRT balance check' 'The Graph wallet balance' 'accept':89 'access':139 'actual':201 'advertis':98,138 'ai/ml':63 'analyt':62 'api':55,132,157 'avail':186 'balanc':4,18,36 'base':6,20,83,104,111 'base-network' 'behind':73 'broader':48 'call':54,208 'captur':198 'challeng':97,197 'confirm':194 'connect':166 'crawl':189 'crypto wallet balance' 'crypto-data' 'data':61 'decim':113 'detail':173 'doc':156 'document':148 'endpoint':30,70,87,192 'equal':115 'exact':124 'exampl':185 'extrem':153 'finance/web3':65 'format':203 'gate':72 'grant':141 'graph':41 'grt':2,16,39 'grt-token' 'header':147 'infer':64 'infrastructur':67 'json':94 'key':133 'limit':136 'live':195 'lowpaymentfee' 'lowpaymentfee.com':32 'made':121 'materi':190 'maxamountrequir':100 'micropay':9,23 'network':84 'offer':56 'openapi':177 'page':161 'paid':207 'part':45 'pay':52 'pay-per-cal':51 'pay-per-request' 'payment':76,119,146 'per':11,25,53,117 'post':90 'price':158 'prompt':168 'protocol':77 'provid':59 'pure':142 'queri':1,15 'rate':135 'readm':160 'render':163 'request':12,26,91,118 'request/response':180 'respons':202 'return':33,93 'schema':181 'scheme':125 'second':129 'settl':78 'site':151 'span':60 'spec':178 'specif':86 'success':206 'suit':49 'technic':172 'thin':154 'timeout':130 'token':42 'token balance API' 'unit':105 'unknown':210 'usag':184 'usdc':14,28,80,107 'usdc-settlement' 'util':68 'via':7,21,122 'wallet':3,17,35,167 'wallet-balance' 'x402':8,22,75,96,145 'x402 crypto API' 'x402-payment'","prices":[{"id":"ff8ad451-c9c7-4ce2-8a18-a98ea487e6b2","listingId":"abc8b09c-c0dd-405b-bb03-3399fec8ba9e","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/wallet/GRT/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:25.192Z"}],"sources":[{"listingId":"abc8b09c-c0dd-405b-bb03-3399fec8ba9e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/GRT/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:25.192Z","lastSeenAt":"2026-04-23T11:04:02.709Z"}],"details":{"listingId":"abc8b09c-c0dd-405b-bb03-3399fec8ba9e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/GRT/balance \\\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 advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/wallet/GRT/balance"},{"claim":"The provider advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/GRT/balance"}],"useCases":["Check GRT token balance for a given wallet address","Monitor The Graph token holdings programmatically","Integrate GRT balance lookups into trading bots or portfolio dashboards"],"bestFor":["Agents needing on-demand GRT balance queries without API key management","Developers building crypto portfolio trackers","Automated workflows that need pay-per-call wallet balance checks"],"notFor":["Bulk historical balance queries (no batch or historical endpoint documented)","Users who need detailed documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.322Z"},"updatedAt":"2026-04-23T11:04:02.709Z"}}