{"id":"d16b3781-0f60-4089-9b76-ce109f6ad056","shortId":"6J5mTj","kind":"x402","title":"Pay-per-call SendGrid API key access via x402 on Base for $0.02 USDC","tagline":"Pay-per-call SendGrid API key access via x402 on Base for $0.02 USDC","description":"This endpoint at lowpaymentfee.com provides access to a SendGrid integration key through the x402 payment protocol. Each call costs $0.02 USDC (20,000 base units of USDC on the Base network). The endpoint accepts POST requests and returns JSON.\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required. Payment is settled on-chain via USDC on the Base L2 network using the x402 \"exact\" payment scheme.\n\nThe specific endpoint `/api/v1/integrations/sendgrid/key` is described only as \"Premium API Access\" with no further documentation on request parameters or response shape. It likely returns a SendGrid API key or credential upon successful payment, but the exact input/output contract is undocumented. There is no OpenAPI spec, no examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" page with no additional detail.","tags":[],"capabilities":["x402-payment","usdc-base","sendgrid-integration","pay-per-call","no-api-key-required"],"categories":["integrations","email"],"synonyms":["sendgrid api key","email api access","sendgrid credential","pay-per-use email","x402 sendgrid","lowpaymentfee sendgrid"],"warnings":["No OpenAPI spec or schema available for this endpoint","No documentation on request body parameters or response format","Unclear what exactly is returned — likely a SendGrid API key, but unconfirmed","Ancillary doc pages (/pricing, /README, /api) render only a 'Connect wallet' prompt with no content","The nature and validity/scope of any returned SendGrid key is unknown — could be shared, rate-limited, or ephemeral"],"endpointUrl":"https://lowpaymentfee.com/api/v1/integrations/sendgrid/key","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/integrations/sendgrid/key","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 x402 402 challenge), but there is zero documentation on request parameters, response schema, or what exactly is returned. No OpenAPI spec, no examples, and ancillary pages are empty. The listing description is generic ('Premium API Access'). Pricing is clear ($0.02 USDC) but the functional contract is entirely opaque.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-21T22:05:15.452Z","embedding":[-0.0138549805,-0.024993896,0.044769287,0.018737793,0.031066895,-0.03616333,-0.01675415,0.03503418,0.047973633,-0.082458496,0.0014400482,-0.027328491,-0.021133423,0.00030255318,-0.0115737915,-0.012268066,-0.013320923,-0.005973816,-0.03286743,0.026550293,0.034851074,-0.023803711,-0.0061912537,0.072753906,-0.017074585,-0.021438599,0.00019943714,0.004348755,0.0034484863,-0.024551392,0.033172607,-0.02154541,-0.025436401,-0.017059326,-0.016662598,0.009674072,-0.009681702,0.035461426,0.023529053,0.00466156,-0.0051727295,-0.051879883,-0.0178833,0.03375244,-0.018249512,-0.012809753,0.0059280396,-0.031021118,-0.01007843,0.011764526,-0.041107178,-0.01977539,0.0034217834,0.013282776,0.007522583,0.02482605,-0.008682251,-0.032073975,0.0051231384,0.021148682,-0.0029296875,-0.047943115,-0.01940918,0.004749298,0.0050621033,0.0569458,-0.0052375793,0.056121826,0.014282227,0.06982422,0.022445679,0.042816162,0.047607422,-0.009544373,0.016296387,0.021453857,0.018753052,0.04534912,-0.015563965,-0.04522705,-0.010368347,0.00082731247,-0.03717041,0.011276245,-0.013015747,-0.055267334,-0.0062065125,0.0013151169,0.006801605,0.04373169,-0.08996582,-0.038848877,-0.009132385,0.012557983,0.010154724,0.044647217,-0.015899658,0.024719238,-0.016159058,0.032562256,0.0211792,-0.016601562,0.029663086,0.004219055,0.034606934,0.050079346,0.01965332,0.04171753,0.031433105,0.0064315796,-0.035980225,0.021469116,-0.016723633,-0.005958557,0.032073975,-0.012626648,-0.02520752,0.011253357,-0.048065186,0.01701355,-0.053527832,0.028900146,0.017929077,-0.003484726,-0.0001527071,-0.06451416,-0.019317627,0.00006431341,-0.041748047,-0.014678955,0.037231445,-0.005455017,0.0335083,-0.00299263,-0.03717041,0.029876709,-0.023910522,-0.03375244,-0.046722412,-0.03250122,0.027877808,-0.04269409,0.011878967,0.024917603,-0.085632324,-0.022994995,-0.039886475,0.016235352,-0.01676941,0.001709938,-0.010551453,0.016174316,-0.0107040405,-0.016571045,-0.016784668,0.008918762,0.012565613,0.039642334,-0.007419586,0.02848816,-0.023162842,0.041992188,0.023513794,0.00573349,-0.01524353,0.010864258,0.000341177,-0.07922363,-0.07092285,0.00018703938,-0.023086548,-0.012191772,-0.007843018,0.017364502,-0.0017662048,-0.04812622,-0.01739502,-0.0009007454,-0.003862381,-0.025756836,-0.005672455,-0.014793396,0.0115737915,0.00031113625,-0.04849243,-0.016464233,-0.01876831,0.06323242,0.015335083,0.0029315948,0.041992188,-0.026626587,0.045959473,0.023101807,0.0071983337,-0.015197754,0.01399231,-0.033325195,0.016326904,0.030014038,-0.0014228821,-0.026748657,0.022201538,0.06677246,0.009902954,-0.029251099,-0.010650635,-0.057250977,-0.030838013,-0.034576416,0.0317688,0.00982666,-0.012763977,0.026626587,-0.049926758,-0.016845703,-0.0011167526,0.02279663,0.04815674,0.05621338,-0.029586792,-0.018539429,0.03503418,0.016204834,-0.031677246,0.027053833,0.028625488,0.0036907196,-0.010772705,-0.017807007,0.033355713,0.039520264,-0.0042686462,-0.016113281,-0.011413574,0.02368164,-0.019943237,0.0064697266,0.034088135,-0.01574707,-0.012420654,-0.04006958,-0.0043029785,0.044311523,-0.020996094,-0.022277832,-0.029663086,-0.058898926,0.070129395,0.034973145,0.022628784,0.036468506,0.008300781,-0.008483887,-0.005458832,-0.07366943,0.053833008,0.047607422,0.03326416,-0.031280518,0.01576233,-0.032165527,-0.03427124,-0.0027809143,-0.00039815903,-0.04397583,-0.018035889,0.014587402,-0.062927246,0.030639648,0.016540527,0.033294678,0.06506348,0.0023422241,-0.025436401,0.0040512085,0.0003285408,0.018081665,-0.03378296,-0.0034446716,-0.021987915,0.0073776245,0.012130737,-0.03237915,0.005065918,-0.0025234222,0.018798828,0.014015198,-0.0035514832,-0.048980713,-0.05340576,0.050811768,0.013092041,-0.024871826,0.011009216,-0.011383057,0.052734375,-0.022216797,0.029281616,-0.02809143,0.021453857,0.0423584,-0.032287598,-0.04360962,-0.018707275,0.026138306,0.010124207,0.047607422,0.008369446,-0.023132324,-0.03842163,0.08178711,-0.02720642,0.020507812,0.010055542,0.046173096,0.023406982,-0.0038433075,-0.07714844,-0.048583984,-0.0362854,-0.0055160522,0.025268555,-0.057800293,0.03353882,-0.005279541,-0.009239197,-0.02494812,0.002500534,-0.020141602,0.04547119,-0.027526855,0.0057678223,-0.017608643,-0.008995056,0.0124435425,-0.0002696514,-0.017440796,0.01751709,0.058044434,0.012298584,-0.022094727,-0.028182983,-0.025665283,-0.0038433075,-0.0058937073,0.008552551,0.015029907,0.028869629,0.02897644,-0.020690918,0.016937256,0.04257202,0.005622864,0.026763916,-0.009971619,0.0062408447,-0.062347412,-0.029937744,-0.035949707,-0.052215576,0.0131073,0.0052986145,-0.0061149597,0.047332764,0.0010766983,-0.01889038,-0.04574585,0.009780884,-0.0357666,0.014762878,0.050689697,-0.015525818,-0.03466797,0.0072631836,0.0048713684,0.017105103,0.050231934,0.02670288,0.008293152,0.07745361,0.060180664,-0.02319336,0.0010919571,-0.0037612915,0.010467529,-0.0037250519,-0.02180481,-0.03616333,0.0149002075,0.019363403,-0.016693115,-0.026977539,-0.06591797,0.079589844,0.06591797,0.07366943,0.023162842,0.011276245,0.023025513,-0.016189575,-0.016738892,-0.03173828,-0.011016846,-0.034973145,-0.08251953,0.021362305,0.0031986237,0.012649536,-0.048461914,0.016082764,0.029876709,0.024917603,-0.039093018,0.029754639,-0.0055274963,-0.01701355,0.02897644,0.008277893,0.045440674,0.06213379,-0.02519226,0.030700684,-0.00036501884,-0.026473999,0.0037574768,0.022964478,0.0021419525,-0.025314331,-0.06561279,-0.028030396,-0.012817383,-0.0209198,-0.06323242,0.0010938644,0.020996094,0.027175903,0.03741455,-0.00089263916,-0.050109863,0.00089359283,0.009727478,-0.04168701,0.0028018951,-0.03491211,-0.0068893433,0.05319214,-0.014854431,-0.0128479,0.0076179504,0.0025291443,-0.020843506,0.026062012,0.0045776367,-0.020553589,-0.045074463,-0.013648987,0.012779236,-0.00073099136,0.0017843246,0.0126571655,0.019866943,0.008293152,0.039276123,0.016296387,-0.007545471,-0.04147339,0.020202637,-0.030761719,0.031311035,0.010719299,-0.023071289,-0.008529663,0.0043640137,-0.0184021,0.0016641617,0.002532959,-0.04953003,0.0020122528,0.023910522,-0.027557373,0.0035800934,-0.05895996,-0.029663086,0.0021877289,0.05429077,0.039916992,-0.021270752,-0.04675293,-0.0345459,0.00081539154,0.018356323,0.00818634,-0.013534546,-0.0048332214,0.0013551712,-0.022460938,-0.013198853,-0.024108887,0.00894165,-0.019561768,-0.016326904,0.0184021,0.0231781,0.022064209,0.0146484375,0.0068588257,0.011985779,-0.03326416,0.0068130493,0.0000074505806,0.05166626,0.005569458,-0.008857727,-0.030822754,0.019088745,0.023376465,0.03878784,-0.026062012,-0.03189087,-0.0018911362,0.014320374,0.007167816,0.001996994,-0.00074863434,-0.003791809,-0.036834717,-0.060577393,0.04324341,-0.032958984,0.022994995,-0.002653122,-0.004081726,0.042877197,-0.010421753,0.0053977966,0.03173828,-0.02268982,-0.027664185,-0.032562256,-0.023803711,-0.003786087,0.018127441,-0.026794434,0.0047340393,-0.008773804,0.023513794,-0.008506775,-0.014411926,0.017196655,0.0074882507,-0.009384155,0.015960693,-0.018478394,0.02897644,0.05105591,-0.002374649,-0.010169983,0.018630981,0.026992798,-0.0096206665,-0.017227173,0.024841309,0.024627686,-0.0018625259,-0.0051460266,0.0028362274,0.00052404404,-0.030166626,0.007762909,0.01802063,0.013717651,-0.02017212,-0.029953003,0.014457703,0.037139893,-0.04849243,-0.018554688,0.011375427,0.00207901,-0.042907715,0.008171082,0.024810791,0.03375244,-0.0014419556,0.00033140182,0.004562378,0.023452759,0.02255249,0.005836487,-0.00028777122,0.029556274,-0.012718201,0.003396988,-0.0135650635,0.00007736683,0.028320312,-0.009681702,0.013313293,0.019058228,-0.004234314,-0.0013494492,-0.034851074,-0.0025596619,0.002588272,-0.016479492,0.024429321,0.039978027,0.022857666,-0.0127334595,0.0008854866,-0.008079529,-0.029586792,-0.008255005,-0.007987976,0.03918457,-0.020904541,-0.00982666,0.016845703,0.021255493,0.009117126,-0.046447754,0.0021820068,-0.014793396,0.008514404,-0.03161621,-0.041778564,-0.05657959,-0.01209259,0.02029419,-0.00059747696,0.0008111,0.03894043,0.010925293,-0.004840851,0.0019140244,0.026245117,-0.020080566,-0.006225586,-0.03677368,-0.02998352,-0.018173218,-0.013084412,-0.04837036,0.032287598,0.0056266785,-0.026290894,-0.0005426407,-0.006542206,-0.0020961761,0.0029144287,0.0038814545,0.055755615,-0.010429382,0.023468018,-0.009231567,-0.033843994,0.004802704,-0.006679535,0.003030777,-0.044952393,0.009483337,-0.012207031,-0.0037574768,0.009017944,-0.0036811829,0.0025806427,0.021072388,0.0093307495,0.02128601,-0.048950195,0.06365967,-0.052337646,-0.010505676,-0.030166626,-0.020843506,-0.015548706,-0.041931152,-0.0028305054,0.030593872,-0.03024292,0.0053596497,-0.016967773,-0.026184082,0.0014162064,-0.058441162,0.015205383,0.04837036,0.040283203,-0.045532227,0.010116577,-0.026473999,0.010848999,-0.015205383,0.013938904,-0.020462036,0.025314331,0.010810852,0.0009250641,-0.03338623,-0.0077934265,0.0004298687,-0.010238647,-0.027801514,-0.040405273,-0.009666443,0.018829346,-0.020645142,-0.016067505,-0.044921875,0.00422287,0.0052261353,-0.053253174,0.02078247,0.0073776245,0.0066184998,-0.013702393,0.0007133484,0.014717102,0.03640747,-0.014274597,0.027297974,-0.0031375885,-0.020095825,-0.042388916,0.03201294,0.014801025,0.008728027,-0.012428284,-0.03616333,-0.012817383,-0.017440796,-0.04083252,-0.02142334,-0.010383606,-0.01424408,0.0042495728,0.017181396,-0.05279541,0.008277893,-0.0135650635,0.0119018555,0.017547607,0.044403076,-0.00969696,-0.017822266,0.018692017,-0.0020160675,-0.005794525,-0.04071045,0.015563965,0.009284973,-0.017211914,0.035614014,0.028320312,0.017074585,-0.031311035,-0.013145447,0.012207031,0.02079773,0.0028018951,0.024993896,-0.007205963,-0.006175995,-0.0052261353,-0.019729614,-0.030975342,0.0019464493,0.078186035,0.02748108,-0.004142761,0.0046920776,-0.020141602,0.01713562,0.0041999817,-0.051971436,-0.0034923553,-0.03137207,-0.0070152283,-0.016571045,0.025527954,0.004463196,0.019317627,-0.008705139,-0.05050659,-0.013877869,0.00021016598,-0.002166748,-0.06311035,-0.02130127,-0.052734375,0.00856781,-0.013458252,-0.012512207,-0.005191803,0.0135269165,-0.00050497055,-0.073913574,0.021621704,0.042999268,0.013198853,0.022018433,0.0010652542,0.013320923,0.019729614,-0.0357666,0.0020198822,0.011070251,-0.030181885,-0.03375244,-0.008918762,0.03366089,-0.023742676,-0.021102905,0.0093307495,-0.005836487,0.043884277,-0.012123108,-0.007080078,0.0014743805,-0.0038814545,-0.024475098,-0.015007019,-0.007320404,0.012535095,0.04751587,-0.024093628,0.03265381,0.0013494492,0.0121536255,0.005722046,0.015655518,0.022735596,-0.03277588,-0.007888794,0.018753052,0.013702393,0.030166626,-0.02142334,0.030593872,0.033416748,-0.0146865845,0.029953003,-0.00011533499,-0.019577026,-0.03491211,-0.016479492,0.01928711,0.026168823,0.0020256042,-0.0231781,0.006526947,0.01574707,-0.0063438416,0.036315918,-0.0044517517,-0.020690918,-0.036956787,-0.000626564,0.01335144,0.0040893555,-0.03225708,0.015312195,0.019607544,0.028945923,-0.0041770935,-0.03062439,0.009117126,0.021484375,-0.0017557144,-0.0055503845,-0.002029419,-0.0073394775,-0.009719849,0.014282227,0.005176544,-0.030166626,-0.01675415,-0.021530151,-0.017364502,0.0023517609,-0.0059509277,-0.00818634,-0.011474609,0.013687134,-0.002922058,-0.008605957,0.007965088,-0.053100586,-0.0012693405,-0.017501831,-0.016647339,0.016738892,0.0066375732,-0.013244629,0.023498535,0.0042915344,0.05618286,0.0038280487,-0.0181427,0.015457153,0.03778076,0.00491333,-0.01676941,-0.015655518,-0.015457153,-0.017730713,-0.008644104,-0.028335571,0.034332275,0.021942139,-0.02947998,0.009803772,0.012710571,0.02986145,-0.017333984,-0.0003361702,0.008598328,0.0034313202,0.007801056,0.032470703,-0.056671143,0.013931274,0.017166138,-0.018844604,0.016418457,-0.023757935,-0.03338623,0.009765625,0.016143799,-0.0040283203,0.035736084,-0.0015487671,0.026245117,-0.010978699,-0.025146484,0.0132369995,-0.052825928,-0.025100708,0.024032593,-0.008979797,-0.0056877136,0.008163452,-0.0014257431,0.028030396,-0.016052246,0.0020961761,-0.00484848,-0.011779785,-0.026138306,-0.0041618347,-0.006313324,0.016113281,-0.014526367,-0.0063095093,-0.016586304,0.033966064,0.038146973,0.030181885,0.04650879,0.0049095154,-0.033111572,-0.02255249,-0.025558472,0.02772522,-0.01537323,0.010345459,-0.0027809143,0.05404663,0.033691406,0.01197052,0.029434204,0.0134887695,0.015670776,-0.0072746277,-0.00067424774,-0.01423645,-0.00013947487,-0.00020837784,0.030029297,0.025222778,0.032348633,-0.02684021,-0.009864807,-0.0036621094,0.02671814,-0.038391113,0.017227173,0.060058594,0.0118255615,-0.015419006,0.040802002,0.0015134811,-0.024963379,-0.0038833618,-0.0046653748,0.0473938,0.018981934,0.0335083,0.031311035,0.0008664131,0.0053977966,-0.0030784607,-0.029052734,-0.010391235,0.070739746,0.004535675,-0.0058784485,-0.015487671,-0.0058937073,0.000002503395,-0.068237305,-0.012901306,-0.004573822,-0.005908966,-0.011947632,-0.016143799,-0.007965088,-0.023223877,0.011962891,0.012992859,0.006164551,-0.015655518,0.028442383,0.032806396,0.011116028,0.025314331,-0.0068206787,0.028320312,-0.02104187,-0.037322998,0.0131073,0.023803711,-0.008979797,-0.020629883,0.034210205,0.016098022,0.050720215,0.0418396,-0.016494751,0.0013637543,0.027145386,-0.0068893433,0.009399414,0.053588867,0.012420654,0.01210022,0.018112183,0.025985718,0.010864258,-0.018920898,0.009208679,-0.00013887882,-0.0029830933,-0.01423645,-0.025405884,-0.017593384,-0.021499634,0.017745972,-0.011039734,-0.031097412,0.029678345,0.030334473,0.018066406,-0.0064888,-0.017288208,0.008201599,0.017227173,0.0020179749,0.026290894,-0.031311035,0.027053833,0.015655518,0.030212402,0.0059051514,0.0022716522,-0.016204834,-0.015731812,-0.035949707,0.008079529,-0.028762817,0.011360168,0.012001038,0.0052833557,-0.036010742,0.02909851,0.018844604,0.0009007454,0.041381836,0.010307312,-0.008644104,-0.00856781,0.025650024,0.0023326874,-0.005874634,-0.0029201508,-0.010810852,0.033111572,0.033172607,-0.0006661415,0.011459351,-0.02418518,0.0047035217,-0.0035324097,-0.02684021,-0.00687027,-0.004917145,-0.023880005,-0.026550293,0.009712219,0.027435303,0.013549805,0.033416748,-0.01335144,-0.016403198,0.028060913,0.024734497,-0.009750366,0.020324707,-0.004005432,0.021591187,0.0050811768,0.032287598,0.053131104,0.032806396,0.034576416,0.0024490356,-0.0014410019,0.024871826,-0.006450653,0.0149383545,-0.015510559,0.00023281574,0.0062026978,0.037384033,-0.016815186,-0.029510498,0.0072364807,-0.018096924,-0.027130127,-0.02116394,-0.0065994263,0.0038909912,0.013977051,0.03845215,0.017364502,-0.012313843,0.058807373,-0.01084137,0.0440979,0.019592285,-0.0030117035,0.04296875,0.023590088,0.006996155,0.028259277,0.012863159,-0.027877808,0.007888794,0.05947876,0.022354126,0.008384705,0.009651184,-0.03048706,0.0126953125,-0.010040283,0.0178833,-0.029373169,-0.013282776,0.0026016235,0.00026082993,-0.025421143,-0.0064315796,-0.010261536,0.0020446777,0.039001465,-0.04006958,-0.029022217,-0.020965576,-0.00920105,0.02053833,-0.016677856,-0.008590698,-0.006385803,-0.031707764,0.021377563,-0.008636475,-0.010292053,-0.0062675476,0.025604248,-0.03845215,-0.021942139,-0.0056037903,0.030410767,-0.013725281,0.013092041,0.01889038,-0.0088272095,0.005279541,0.031402588,-0.02230835,0.046142578,-0.008514404,0.030975342,0.029373169,0.00070238113,-0.013877869,-0.0024204254,-0.00050115585,-0.0012521744,0.012306213,0.035888672,-0.021636963,0.007167816,-0.0075798035,-0.00021266937,-0.0046920776,0.009315491,-0.00082969666,0.0003900528,0.0067481995,-0.022125244,-0.013931274,0.021560669,-0.0015478134,-0.0085372925,-0.02458191,-0.0071868896,0.011451721,0.020858765,0.014350891,-0.042877197,0.011833191,0.0073051453,0.017333984,0.0022659302,0.0008792877,0.008460999,-0.061431885,0.007331848,0.027633667,0.005744934,0.0071792603,-0.029067993,0.013397217,0.01914978,0.0058059692,0.022720337,0.00932312,-0.0143585205,-0.004940033,0.00068092346,-0.009994507,-0.011421204,-0.014411926,0.009086609,0.032318115,-0.006198883,-0.046142578,0.0037136078,-0.001288414,0.029174805,0.00040555,-0.01638794,0.018096924,0.0051078796,-0.023345947,0.0011482239,0.0058021545,-0.033325195,-0.008476257,-0.0015830994,0.019256592,0.058288574,-0.0052757263,-0.008857727,0.033843994,0.022644043,0.012145996,0.033233643,0.0018835068,0.048431396,0.02166748,-0.0062446594,-0.0104904175,0.037597656,-0.017562866,-0.032684326,-0.0041885376,-0.020233154,-0.039520264,0.03805542,0.024429321,-0.0074501038,-0.010948181,-0.0011405945,-0.0052108765,-0.017959595,0.015335083,-0.026519775,0.011253357,-0.016342163,0.000078082085,-0.026947021,-0.018463135,-0.04940796,-0.015129089,-0.015167236,0.000192523,-0.03967285,-0.009811401,-0.013702393,-0.0013494492,-0.028549194,-0.02684021,-0.010276794,0.026763916,-0.018554688,0.017410278,0.012069702,0.0096588135,0.019439697,0.01828003,0.020050049,-0.04168701,-0.032226562,-0.020553589,0.00687027,-0.0284729,0.034942627,0.0052757263,0.04434204,0.028366089,-0.0146865845,-0.018997192,0.0014162064,-0.014053345,-0.010231018,0.00008547306,-0.027633667,0.005836487,0.009132385,-0.015548706,-0.0058784485,0.056365967,-0.03970337,0.003932953,0.02305603,0.05050659,0.021362305,0.0357666,-0.021606445,0.008163452,-0.0038547516,0.00006645918,-0.010055542,0.003396988,0.011779785,0.0047569275,0.0010557175,0.017547607,0.02267456,-0.027359009,0.00029325485,0.017654419,0.017623901,-0.042907715,0.007484436,-0.0049705505,0.008056641,-0.012298584,-0.0034217834,0.011558533,0.040222168,0.02432251,0.023880005,-0.004508972,-0.0076026917,-0.021530151,0.014335632,-0.0063095093,-0.048980713,-0.028518677,-0.0077934265,-0.04598999,-0.0033092499,-0.021438599,0.0074691772,-0.0013685226,0.0234375,-0.002521515,-0.025863647,-0.010795593,0.031463623,-0.0057373047,-0.0053253174,-0.007827759,0.010070801,0.00019049644,-0.015609741,-0.002943039,-0.0597229,-0.022827148,0.016067505,-0.018676758,0.012161255,0.0050468445,-0.013977051,0.0043411255,0.008361816,-0.0030078888,-0.0068969727,0.020904541,-0.0021743774,-0.0047721863,0.0076675415,0.013130188,-0.015296936,0.023635864,-0.00932312,0.0052490234,0.008529663,-0.0016727448,0.00007593632,-0.0178833,0.023803711,0.002046585,-0.00919342,0.035369873,-0.016906738,-0.028823853,-0.036743164,0.033813477,0.011734009,-0.0129776,0.011894226,-0.025054932,-0.036865234,0.004638672,-0.015434265,-0.02709961,-0.0007505417,0.03778076,0.03970337,0.010314941,0.032409668,-0.026641846,-0.00024151802,0.019973755,0.0044059753,-0.017227173,-0.0065841675,0.039642334,-0.0071983337,-0.021469116,-0.005569458,-0.013755798,-0.018997192,-0.023361206,0.015808105,-0.0033779144,0.0035324097,0.020553589,0.015899658,0.027908325,-0.010612488,0.02041626,-0.0004389286,0.024841309,0.021087646,0.0053367615,0.04333496,-0.0006341934,-0.018417358,0.000084638596,0.033355713,-0.001455307,0.002614975,-0.0042686462,-0.0056037903,-0.047424316,0.027862549,-0.022155762,0.052947998,-0.024459839,0.020690918,-0.020767212,-0.0039253235,-0.019485474,-0.01737976,-0.021484375,-0.004032135,0.042022705,-0.0013179779,0.024490356,0.011871338,-0.042633057,0.018203735,0.024475098,-0.0029010773,-0.016677856,-0.009056091,0.01651001,0.005191803,0.0138549805,0.021194458,-0.02659607,-0.001701355,0.005039215,0.003238678,-0.0076293945,0.018066406,0.006210327,0.0033111572,-0.007083893,0.0021972656,0.039031982,-0.0024986267,-0.03265381,0.010139465,0.008239746,0.045837402,0.014793396,-0.017211914,0.028762817,-0.0082473755,-0.022003174,0.06665039,-0.012619019,0.007446289,-0.018035889,0.011024475,-0.051696777,-0.01914978,-0.014877319,-0.0022945404],"createdAt":"2026-04-21T18:32:23.210Z","updatedAt":"2026-04-22T02:32:02.643Z","lastSeenAt":"2026-04-22T02:32:02.643Z","tsv":"'/api/v1/integrations/sendgrid/key':132 '0.02':14,29,50,96 '000':53 '20':52 'accept':64 'access':8,23,36,139 'addit':194 'ai/ml':86 'analyt':85 'api':6,21,82,101,138,155,183 'base':12,27,54,60,120 'broad':75 'call':4,19,48,81 'catalog':76 'chain':115 'commit':108 'connect':189 'contract':166 'cost':49 'crawl':178 'credenti':158 'crypto':89 'data':84 'describ':134 'detail':195 'doc':179 'document':143 'email api access' 'endpoint':32,63,131 'exact':126,164 'exampl':175 'financ':88 'host':73 'infer':87 'input/output':165 'integr':40 'json':69 'key':7,22,41,102,156 'l2':121 'like':151 'limit':105 'lowpaymentfee sendgrid' 'lowpaymentfee.com':34,72 'minim':188 'network':61,122 'no-api-key-required' 'on-chain':113 'openapi':172 'page':180,191 'paramet':146 'pay':2,17,79 'pay-per-cal':1,16,78 'pay-per-call' 'pay-per-use email' 'payment':45,110,127,161 'per':3,18,80,97 'post':65 'premium':137 'price':94,181 'protocol':46 'provid':35,71 'rate':104 'readm':182 'request':66,98,145 'requir':109 'resolv':185 'respons':148 'return':68,152 'scheme':128 'sendgrid':5,20,39,154 'sendgrid api key' 'sendgrid credential' 'sendgrid-integration' 'servic':92 'settl':112 'shape':149 'span':83 'spec':173 'specif':130 'success':160 'undocu':168 'unit':55 'upon':159 'usdc':15,30,51,57,117 'usdc-base' 'use':123 'util':91 'via':9,24,116 'wallet':190 'x402':10,25,44,125 'x402 sendgrid' 'x402-payment'","prices":[{"id":"c6f645ce-fb93-41a6-809f-8b1bd0cb3c90","listingId":"d16b3781-0f60-4089-9b76-ce109f6ad056","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/integrations/sendgrid/key","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.210Z"}],"sources":[{"listingId":"d16b3781-0f60-4089-9b76-ce109f6ad056","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/integrations/sendgrid/key","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.210Z","lastSeenAt":"2026-04-22T02:32:02.643Z"}],"details":{"listingId":"d16b3781-0f60-4089-9b76-ce109f6ad056","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/integrations/sendgrid/key \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/integrations/sendgrid/key"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/integrations/sendgrid/key"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Obtaining a SendGrid API key on-demand without a traditional account signup","Programmatic access to email-sending infrastructure via a single micropayment","Agent-driven workflows that need transient email credentials"],"bestFor":["Agents or scripts needing quick, one-off SendGrid API access","Developers who want to avoid managing SendGrid accounts directly","Micropayment-based access to email infrastructure"],"notFor":["Production email workflows requiring persistent, long-lived API keys with known quotas","Users who need detailed documentation or SLA guarantees before integrating","High-volume email sending where a direct SendGrid plan would be cheaper"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.146Z"},"updatedAt":"2026-04-22T02:32:02.643Z"}}