{"id":"3dc18a90-9a05-4d0c-a225-499c4828a481","shortId":"YRnMWT","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/payments/77` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page 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 documentation, and no usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content","The specific purpose of /api/v1/payments/77 ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/77","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/payments/77","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The purpose of this specific '/payments/77' endpoint is unclear beyond the generic 'Premium API Access' label. Most doc pages render only 'Connect wallet' with no content.","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":"2026-04-19T07:23:59.181Z","embedding":[-0.024551392,-0.033294678,0.034851074,0.021835327,0.014404297,-0.034423828,-0.01789856,0.039764404,0.07092285,-0.061767578,0.022109985,-0.04711914,-0.035247803,-0.03451538,-0.020309448,0.011619568,-0.0007762909,0.004081726,-0.033203125,0.027175903,0.017028809,-0.009597778,-0.03137207,0.031585693,0.0047836304,-0.010475159,-0.004234314,-0.0048675537,-0.011245728,-0.047943115,0.042388916,-0.028823853,-0.016525269,0.015419006,-0.022125244,-0.0050468445,-0.008979797,0.032806396,0.023391724,-0.011054993,-0.008850098,-0.06915283,0.006362915,-0.015274048,-0.06210327,-0.0062713623,0.010520935,-0.020584106,0.0019874573,0.0044441223,-0.036590576,-0.006210327,-0.0146484375,0.0018291473,0.00074768066,0.013015747,-0.0069389343,-0.0066604614,0.012512207,0.016708374,0.00365448,-0.05569458,-0.017074585,-0.0016374588,-0.001824379,0.051971436,-0.004852295,0.032073975,0.006690979,0.072509766,0.042266846,0.04360962,0.030761719,0.0105896,-0.008300781,-0.00806427,0.0018081665,0.06085205,-0.01335907,-0.03164673,-0.007987976,-0.019454956,-0.049102783,0.004421234,-0.021606445,-0.0491333,-0.024520874,0.021575928,-0.020812988,0.032440186,-0.07019043,-0.0059928894,-0.019119263,-0.0023841858,0.00774765,0.0007777214,-0.014556885,0.019348145,-0.012390137,0.015823364,-0.0019607544,-0.039215088,0.008232117,0.009887695,0.036956787,0.05065918,0.018539429,0.022644043,0.013397217,-0.0009212494,-0.032470703,0.020019531,-0.01335907,-0.013374329,0.017700195,0.0022125244,-0.014579773,0.015655518,-0.03451538,0.0151901245,-0.05596924,0.049346924,0.013168335,0.008857727,0.008110046,-0.045715332,-0.019104004,0.0154800415,-0.025787354,-0.007369995,0.007247925,0.012809753,0.022781372,-0.0071372986,-0.03756714,0.016113281,-0.022766113,-0.011512756,-0.05014038,-0.03390503,0.04135132,-0.03149414,0.018310547,0.04046631,-0.10070801,-0.015930176,-0.04953003,0.0021533966,-0.038391113,-0.0069999695,0.004840851,0.02545166,-0.01789856,-0.014503479,-0.022354126,-0.02809143,-0.0075798035,0.03942871,-0.0076522827,0.046295166,-0.013717651,0.034332275,0.017089844,0.005859375,0.016174316,0.028930664,-0.0074653625,-0.08190918,-0.08276367,-0.023208618,-0.007183075,-0.025970459,-0.021270752,0.012466431,-0.0014801025,-0.078063965,-0.02279663,-0.012931824,-0.0067749023,-0.03894043,0.0024909973,-0.03262329,0.012779236,-0.006275177,-0.057250977,-0.018615723,-0.030914307,0.06085205,0.031463623,0.027542114,0.022720337,-0.024612427,0.058746338,0.027999878,-0.008880615,-0.02456665,0.021835327,-0.0211792,0.011657715,-0.010009766,0.009231567,-0.022064209,0.03829956,0.07745361,0.005001068,-0.01953125,-0.0129852295,-0.05545044,-0.05380249,-0.033172607,0.019561768,0.0069618225,-0.00566864,0.027923584,-0.038238525,-0.028335571,0.002822876,0.013031006,0.013244629,0.068115234,0.006629944,-0.011581421,0.03363037,0.024017334,-0.057403564,0.039886475,0.03756714,0.018295288,-0.02027893,-0.029449463,0.030685425,0.035186768,-0.024307251,0.024856567,-0.0236969,0.024230957,-0.0076141357,0.0034980774,0.01184845,-0.019607544,-0.026443481,-0.026748657,-0.025054932,0.027877808,0.006752014,-0.022949219,-0.031555176,-0.08306885,0.049072266,0.034606934,0.039154053,0.0038928986,0.0073509216,-0.022918701,-0.004749298,-0.07672119,0.06750488,0.076660156,0.0067253113,-0.011199951,0.023391724,-0.013717651,-0.03012085,0.0061912537,-0.009033203,-0.030197144,-0.025039673,0.02053833,-0.04269409,-0.007118225,0.027160645,0.01977539,0.04510498,-0.0066719055,-0.04727173,-0.020889282,-0.0042381287,-0.005672455,-0.033355713,-0.008361816,-0.007091522,0.018692017,0.025787354,0.0030956268,0.017028809,-0.005004883,-0.0020809174,-0.009941101,0.0028018951,-0.010383606,-0.02470398,0.015914917,0.0036392212,-0.05307007,0.012641907,-0.0104522705,0.0715332,-0.04559326,0.030059814,-0.013282776,0.014671326,0.05456543,-0.012039185,-0.051849365,0.0035552979,0.027267456,0.012832642,0.049682617,0.0154800415,-0.033813477,-0.013839722,0.07470703,-0.009010315,-0.0041999817,0.014480591,0.015136719,0.03137207,-0.0056915283,-0.059661865,-0.03652954,-0.00093078613,-0.024841309,0.033966064,-0.023025513,0.02885437,-0.009353638,0.0058898926,-0.02458191,0.00041556358,-0.03265381,0.008163452,-0.013122559,0.0034389496,-0.015640259,-0.021377563,0.014907837,0.020965576,-0.01889038,0.005241394,0.040161133,0.019760132,-0.0076828003,-0.023666382,-0.03579712,-0.009544373,-0.009109497,0.022323608,0.024963379,0.02784729,0.055755615,-0.04663086,0.0055999756,0.026351929,0.0061798096,0.038635254,-0.0042800903,-0.0008792877,-0.066833496,-0.050964355,-0.023330688,-0.040893555,0.032409668,0.021362305,-0.0062561035,0.056884766,0.012886047,-0.023239136,-0.04260254,0.018493652,-0.041046143,-0.0019702911,0.049072266,-0.023330688,-0.026535034,0.014579773,-0.009277344,0.012428284,0.040771484,0.021881104,0.029449463,0.065979004,0.045898438,0.01071167,0.01890564,0.0035076141,0.02947998,0.015640259,-0.019943237,-0.022399902,-0.013999939,0.036193848,-0.02357483,-0.021987915,-0.053955078,0.06640625,0.04071045,0.089660645,0.024963379,0.004348755,0.040863037,-0.020202637,0.010803223,-0.017593384,-0.019638062,-0.0289917,-0.04727173,0.029159546,-0.013671875,-0.009140015,-0.025924683,0.037872314,-0.0067367554,0.018722534,-0.03286743,0.045196533,-0.009864807,-0.013267517,0.015670776,0.015960693,0.051483154,0.05731201,-0.04425049,0.025848389,0.016418457,-0.032958984,-0.0020503998,0.03857422,-0.014404297,-0.0055274963,-0.05090332,-0.02848816,-0.015403748,-0.0023231506,-0.047607422,0.004398346,-0.0017499924,0.020767212,0.033477783,-0.014122009,-0.010070801,-0.015266418,-0.016098022,-0.054718018,-0.0060157776,-0.039215088,-0.007575989,0.037506104,-0.02166748,-0.010856628,0.0014123917,-0.005847931,-0.006374359,0.022613525,0.031463623,0.0015220642,-0.046295166,0.03665161,0.0074653625,0.009552002,0.01096344,0.040893555,0.025802612,0.029373169,0.045318604,0.01108551,-0.013885498,-0.06628418,0.025756836,-0.040618896,0.0077819824,0.025039673,-0.015533447,-0.0052452087,-0.018096924,-0.027572632,-0.03289795,0.016555786,-0.023223877,0.005657196,0.025939941,-0.019073486,-0.021621704,-0.054473877,-0.02458191,-0.0032043457,0.0670166,0.021072388,-0.003068924,-0.06463623,-0.006969452,0.01939392,0.0026607513,0.037750244,-0.013938904,-0.0073051453,-0.01838684,-0.032104492,-0.007369995,-0.016815186,0.023376465,-0.010261536,0.0014925003,0.013397217,0.01927185,0.022125244,0.009559631,0.005504608,0.0231781,-0.02420044,-0.0053253174,-0.007411957,0.033325195,0.015380859,-0.0006952286,-0.04119873,0.04598999,0.0146102905,0.03363037,-0.04272461,-0.0029029846,-0.00070667267,0.010009766,0.021881104,-0.008285522,-0.008636475,-0.006587982,-0.04638672,-0.07458496,0.051879883,-0.027389526,0.027420044,0.026824951,0.007785797,0.023025513,-0.007129669,-0.0031433105,0.016937256,-0.022903442,-0.016403198,-0.021896362,-0.027542114,-0.020690918,-0.013809204,-0.02885437,0.02293396,-0.018630981,0.012863159,-0.002708435,-0.025787354,0.016433716,0.00017404556,-0.008407593,0.018218994,0.0038070679,0.025665283,0.04486084,0.006465912,-0.035827637,0.022949219,0.0051651,0.003446579,-0.0031547546,0.046020508,0.03353882,-0.007785797,-0.006462097,-0.008308411,-0.014816284,-0.023330688,0.010543823,-0.0001373291,0.0037574768,-0.006526947,-0.047943115,0.012306213,0.004535675,-0.030731201,-0.02204895,0.011039734,0.012359619,-0.033233643,0.02381897,0.025390625,0.04928589,-0.023803711,-0.0008420944,-0.0018920898,0.03363037,0.032104492,0.0158844,-0.009353638,0.021560669,-0.013374329,0.016708374,-0.005508423,-0.015823364,0.018753052,0.0011768341,0.019866943,0.026763916,0.0032463074,-0.024963379,-0.034606934,0.00774765,-0.016204834,-0.0345459,0.02015686,0.019500732,0.029220581,-0.02709961,0.021133423,0.014205933,-0.011390686,-0.01763916,-0.012825012,0.04260254,-0.009803772,-0.013679504,0.015716553,0.01322937,0.031311035,-0.055908203,-0.0018100739,-0.0014896393,0.009262085,-0.025939941,-0.045166016,-0.04019165,0.0019197464,0.03643799,0.017074585,0.024719238,0.030685425,-0.0011539459,0.005126953,0.021835327,-0.00057935715,-0.017211914,-0.011962891,-0.055511475,-0.02067566,-0.014518738,0.0043563843,-0.028747559,0.012062073,0.0022354126,-0.025650024,0.012367249,-0.0038642883,-0.0074539185,-0.009857178,-0.0013504028,0.045288086,0.0008535385,0.016586304,-0.022750854,-0.03543091,-0.007820129,0.009529114,0.014015198,-0.04522705,0.014968872,-0.012313843,-0.0073242188,0.0023384094,0.011314392,0.017440796,0.030044556,0.01272583,0.031982422,-0.04058838,0.050720215,-0.044311523,0.018325806,-0.0006747246,-0.030792236,-0.0090408325,-0.022735596,-0.009033203,0.047790527,-0.029296875,-0.0006966591,-0.028930664,-0.038757324,-0.010795593,-0.052978516,0.009185791,0.038879395,0.038513184,-0.030548096,-0.000767231,-0.0015907288,0.0020198822,-0.01626587,0.010070801,-0.016662598,0.017654419,0.026306152,0.0005412102,-0.023269653,-0.03213501,-0.019439697,-0.007484436,-0.041046143,-0.049560547,-0.016052246,0.0009803772,-0.003774643,-0.014816284,-0.028518677,-0.039642334,-0.0049095154,-0.03857422,0.013916016,0.002008438,0.010169983,0.011474609,-0.027023315,0.00020670891,0.018417358,-0.019165039,0.033966064,0.011398315,-0.008384705,-0.043151855,0.0042266846,0.01084137,0.019119263,-0.010971069,-0.014930725,-0.0044288635,-0.024642944,-0.057800293,0.00079250336,-0.013580322,-0.0057640076,-0.009254456,0.013244629,-0.051361084,-0.0012760162,-0.017349243,0.0058059692,0.022949219,0.020019531,0.0064811707,0.0049705505,0.020935059,-0.0037517548,-0.009147644,-0.033599854,0.011894226,0.010269165,0.0063934326,0.034057617,0.042510986,0.0034656525,-0.030548096,0.015396118,0.014297485,0.01663208,-0.021270752,0.0039367676,-0.02709961,0.015007019,-0.010879517,-0.008552551,-0.037597656,0.0023994446,0.08026123,-0.0021572113,-0.0135269165,-0.014892578,-0.016967773,0.020629883,0.03024292,-0.044647217,-0.0065956116,-0.02520752,0.016082764,-0.027755737,0.006061554,-0.0035037994,0.021636963,-0.016235352,-0.048828125,-0.01512146,-0.013694763,-0.013633728,-0.057647705,-0.029418945,-0.07196045,0.009590149,-0.014556885,-0.01651001,-0.0042266846,0.010856628,-0.019805908,-0.07678223,-0.0019512177,0.0491333,0.0024280548,0.022003174,-0.0065727234,0.01876831,0.027130127,-0.039398193,0.0020923615,0.027420044,-0.026519775,-0.018737793,-0.01927185,0.012329102,-0.01638794,-0.013343811,0.008857727,0.008911133,0.017822266,-0.009887695,0.005882263,-0.005268097,0.02456665,-0.018753052,0.017486572,-0.009185791,-0.008834839,0.032196045,-0.0395813,0.026870728,0.008361816,-0.011581421,0.007381439,0.029968262,0.049102783,-0.035308838,-0.018539429,0.022140503,0.016342163,0.035736084,-0.01902771,0.0413208,0.005821228,-0.01789856,0.011619568,-0.009666443,-0.015510559,-0.030960083,-0.027420044,0.029403687,0.00049352646,0.010322571,-0.0146102905,0.011047363,0.016921997,0.00217247,0.009925842,-0.0047302246,-0.021835327,-0.020935059,0.0018262863,0.00070858,0.008666992,-0.003704071,0.027923584,0.02571106,0.033966064,0.011947632,-0.01776123,-0.0012655258,0.029724121,-0.008399963,-0.004058838,0.02810669,0.0041160583,0.013885498,0.02507019,0.012649536,-0.048034668,-0.014465332,-0.025527954,-0.026641846,-0.0021324158,-0.0074272156,-0.013305664,-0.0029468536,0.006877899,-0.01108551,-0.029830933,0.005268097,-0.025970459,-0.030456543,0.0016908646,-0.020050049,0.02166748,0.0036907196,0.008934021,0.0060195923,-0.009208679,0.045806885,-0.0025920868,-0.016998291,0.04611206,0.034484863,0.015533447,-0.02734375,-0.0085372925,-0.015670776,-0.012763977,0.0019407272,-0.04147339,0.009338379,0.04776001,-0.025115967,0.0015468597,0.003780365,0.026275635,-0.0032787323,0.0053634644,-0.00012421608,0.017089844,-0.0082092285,0.03466797,-0.050476074,0.014274597,0.00756073,0.0019836426,-0.020812988,-0.010955811,-0.026306152,0.016326904,0.0038414001,-0.0093307495,0.049041748,0.0076522827,0.02720642,-0.017807007,-0.025726318,0.012687683,-0.033294678,-0.023376465,0.028671265,-0.007457733,-0.0062065125,0.01953125,-0.0141067505,0.035217285,-0.032196045,0.014404297,0.010231018,-0.0018777847,-0.0053215027,-0.018463135,-0.010261536,-0.0064697266,-0.013923645,0.0071029663,-0.0025100708,0.049102783,0.016403198,0.031021118,0.052337646,0.019882202,0.0049362183,-0.038879395,-0.03213501,0.000872612,-0.021499634,0.013717651,-0.008575439,0.056365967,0.032165527,0.011489868,0.036956787,0.025756836,0.03704834,0.004421234,0.009597778,-0.015960693,0.014144897,-0.0030536652,0.027801514,-0.0056648254,0.03994751,-0.044158936,0.025848389,0.013717651,0.020721436,-0.025878906,0.036895752,0.05697632,0.01574707,-0.009506226,0.049804688,-0.006549835,-0.0082092285,-0.009094238,-0.016540527,0.044311523,0.018539429,0.040100098,0.05419922,0.008308411,-0.0043678284,0.022659302,-0.030227661,-0.030471802,0.056884766,0.027435303,-0.022155762,-0.01436615,-0.0000029802322,0.011367798,-0.047058105,-0.025909424,0.026107788,-0.0082473755,-0.0000860095,-0.008621216,-0.012458801,-0.011413574,0.0020122528,0.027694702,0.015945435,-0.013641357,0.031829834,0.027694702,-0.0027828217,0.037384033,-0.0022277832,0.029678345,-0.024017334,-0.026153564,0.018997192,0.019805908,-0.011413574,-0.011695862,0.02520752,0.0065689087,0.039520264,0.039733887,-0.024719238,0.010322571,0.030395508,0.0146102905,-0.0016841888,0.059570312,0.04220581,0.016357422,0.03866577,0.026763916,0.03744507,-0.043426514,0.014335632,0.0051498413,0.009422302,-0.006931305,-0.01134491,0.007858276,-0.01184845,0.024627686,-0.0037155151,-0.011177063,0.025619507,0.02368164,-0.006538391,-0.0065231323,-0.009681702,0.008117676,-0.02810669,-0.0038585663,0.015007019,-0.016647339,0.040222168,0.011817932,0.02607727,-0.02532959,0.020874023,-0.00121212,-0.018875122,-0.0052948,0.022659302,-0.035614014,0.008857727,-0.009468079,0.0042648315,-0.0496521,0.01525116,0.033599854,-0.020080566,0.025863647,0.0096588135,-0.0016880035,-0.009384155,0.025146484,0.0043907166,0.0048942566,-0.0079193115,-0.02180481,0.031311035,0.043884277,-0.001742363,0.0050697327,-0.026153564,-0.0062561035,0.004650116,-0.012390137,0.0015649796,-0.011566162,-0.017562866,-0.024368286,0.015289307,0.034729004,0.026107788,0.05319214,-0.019638062,-0.013130188,0.013511658,0.03692627,0.0028800964,-0.00018405914,-0.0018310547,0.029083252,-0.021347046,0.048065186,0.040222168,0.0121536255,0.03845215,-0.0038414001,-0.017303467,0.012123108,-0.0059432983,0.023025513,-0.016662598,0.005203247,-0.003643036,0.028289795,-0.008712769,-0.035095215,0.007637024,-0.012382507,-0.022842407,-0.01638794,0.01285553,0.0057640076,0.032226562,0.04171753,0.026519775,-0.02758789,0.059509277,-0.01285553,0.045410156,0.00057029724,-0.012268066,0.05618286,0.018829346,0.035217285,0.020599365,0.017562866,-0.034088135,0.01424408,0.032470703,0.027175903,0.00881958,0.008270264,-0.012687683,0.04147339,-0.0034008026,0.031143188,-0.009407043,-0.001452446,0.009262085,0.0033912659,-0.007850647,-0.003227234,-0.007637024,0.004623413,0.043151855,-0.02659607,-0.008613586,-0.020690918,-0.0129470825,0.02720642,-0.010902405,0.0020332336,-0.0085372925,-0.024673462,0.007881165,-0.0256958,-0.03012085,0.0052337646,0.020629883,-0.047729492,-0.0047836304,0.008460999,0.016403198,-0.027801514,0.028808594,0.025863647,0.0037651062,0.008712769,0.0463562,-0.011604309,0.030426025,-0.013435364,0.030914307,0.032989502,0.011741638,-0.011436462,-0.0006489754,0.011192322,-0.01083374,0.015068054,0.03274536,-0.013053894,-0.004184723,-0.00097084045,-0.0042304993,0.0028057098,0.0073280334,-0.0060424805,0.012252808,-0.011955261,-0.011367798,-0.0011081696,0.0074310303,0.0039749146,0.0035743713,-0.0076446533,-0.0151901245,0.011329651,0.030471802,0.022033691,-0.035339355,-0.004711151,-0.00026249886,0.010414124,-0.016494751,-0.009155273,0.00024580956,-0.04345703,0.016067505,0.01675415,0.006706238,0.0129852295,-0.028808594,0.0017023087,0.023895264,0.009933472,0.013977051,0.005088806,-0.00003963709,0.01071167,-0.003917694,-0.008094788,-0.005718231,-0.009338379,0.012512207,0.02355957,-0.006866455,-0.03164673,0.030792236,0.0045280457,0.011360168,-0.00033211708,-0.008842468,0.02734375,-0.0027427673,-0.0019874573,0.0015869141,0.014633179,-0.009971619,-0.0037517548,-0.015022278,0.036102295,0.054534912,-0.010559082,-0.012535095,0.022583008,0.016723633,0.016952515,0.038085938,-0.0008664131,0.038085938,0.0211792,-0.020858765,-0.020462036,0.01838684,-0.010528564,-0.023864746,0.016098022,-0.017990112,-0.014198303,0.023986816,0.009643555,-0.0020809174,-0.038391113,-0.009864807,-0.006549835,-0.015266418,0.015792847,-0.011520386,0.017105103,-0.022827148,-0.006958008,0.0049972534,-0.0262146,-0.05029297,-0.017425537,0.004787445,-0.009475708,-0.05770874,0.0030384064,-0.026870728,0.0072135925,-0.023590088,-0.006652832,-0.016281128,0.018844604,-0.015457153,-0.010925293,0.0013799667,0.021743774,0.026535034,-0.0016298294,0.024139404,-0.028808594,-0.020324707,-0.028289795,0.0154953,-0.014595032,0.019744873,-0.0018987656,0.036132812,0.022659302,-0.014862061,-0.00094366074,-0.008613586,-0.008163452,-0.016326904,-0.015472412,-0.026000977,0.026535034,0.014297485,-0.006706238,-0.011291504,0.036224365,-0.025939941,-0.0154418945,0.025939941,0.047912598,0.011413574,0.023773193,-0.009597778,-0.0040740967,-0.012634277,0.0009946823,-0.018463135,0.0029735565,0.01612854,0.0051879883,-0.004512787,0.010528564,0.024215698,-0.013549805,-0.0029563904,0.035949707,0.008483887,-0.00573349,0.039611816,0.012489319,0.006298065,-0.012329102,-0.010658264,0.022766113,0.041778564,0.00856781,0.013748169,-0.008079529,0.0026435852,-0.011138916,0.011619568,0.023757935,-0.021759033,-0.04510498,-0.013542175,-0.041229248,0.022216797,-0.0061187744,0.011817932,-0.0063591003,0.014953613,-0.02178955,-0.029220581,-0.011306763,0.030395508,0.019119263,-0.009521484,-0.012069702,0.015823364,0.005168915,-0.036071777,-0.005126953,-0.04107666,-0.042114258,-0.008140564,-0.016830444,0.02154541,0.012954712,-0.009391785,-0.0009531975,-0.0016326904,0.0039978027,0.0006489754,0.024414062,-0.0044555664,0.000043213367,0.032196045,0.014877319,-0.014572144,0.020050049,-0.0127334595,0.0015134811,0.009735107,-0.00970459,0.0181427,-0.018173218,0.030349731,-0.009269714,-0.0032100677,0.029647827,-0.011993408,0.006580353,-0.02947998,0.00566864,0.0076179504,-0.004016876,0.03643799,-0.03173828,-0.030456543,0.008735657,-0.021820068,-0.024810791,0.0036811829,0.017974854,0.03942871,-0.00982666,0.043121338,-0.015213013,-0.010650635,0.018722534,0.009399414,-0.013412476,0.0072021484,0.029891968,0.00573349,-0.005973816,-0.0039367676,-0.0032444,-0.03845215,-0.009727478,0.0118637085,-0.00031232834,-0.014945984,0.03491211,0.011482239,0.049438477,-0.009437561,0.014968872,0.0090408325,0.006275177,0.02470398,0.0047035217,0.055145264,-0.009063721,-0.029449463,0.0061798096,0.008918762,-0.026351929,0.005683899,-0.008529663,0.0024337769,-0.043182373,0.010543823,-0.007980347,0.020523071,-0.02708435,0.011978149,-0.024734497,-0.010955811,-0.042510986,-0.008903503,-0.02709961,0.011726379,0.030914307,0.0022964478,0.03086853,0.0018730164,-0.029159546,0.022247314,0.043548584,0.0013904572,-0.0340271,-0.025482178,0.013465881,-0.002439499,0.0069503784,0.0036754608,-0.02166748,-0.012680054,-0.0043907166,-0.015792847,0.005004883,-0.0050697327,0.018417358,0.008979797,-0.00541687,-0.0058288574,0.026351929,-0.0048828125,-0.011489868,0.013282776,0.004135132,0.040496826,0.03717041,-0.022750854,0.019989014,0.017181396,-0.044921875,0.057495117,-0.0003862381,0.027877808,-0.012023926,0.006095886,-0.04119873,-0.02671814,-0.02041626,-0.0017137527],"createdAt":"2026-04-18T18:50:52.609Z","updatedAt":"2026-04-24T01:32:23.422Z","lastSeenAt":"2026-04-24T01:32:23.422Z","tsv":"'/api/v1/payments/77':119 '/request':13,32 '0.02':12,31,72,140,199 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '20':134 '300':158 '402':129 '6':145 'Base network API' 'USDC micropayment API' 'accept':163 'access':125 'across':58 'address':154 'advertis':172 'ai/ml':61 'analysi':176 'analyt':60 'api':5,17,24,36,45,89,124,213 'application/json':168 'attach':101 'avail':243 'base':8,27,80,136,148 'beyond':204 'broad':50 'broader':170 'call':4,23 'caller':99 'catalog':51 'challeng':130 'classif':179 'connect':222 'content':247 'convers':191 'crawl':246 'crypto-paid API' 'data':59,193 'decim':146 'detail':229 'doc':212 'document':203,238 'embed':180 'enabl':44 'endpoint':57,68,117,162,173 'estim':188 'exampl':242 'exchang':183 'extrem':209 'feed':182 'finance/web3':63 'gas':187 'generat':194 'geocod':189 'header':106 'howev':202 'infer':62 'infrastructur':65 'json-response' 'key':18,37,90 'land':206 'limit':98 'list':121 'lowpaymentfee' 'lowpaymentfee.com':39 'mean':85 'network':9,28,81 'no-api-key' 'offer':48 'openapi':233 'page':207,217 'paid':75 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':105,110,150 'per':3,22,55,73 'platform':6,25,46,171 'point':201 'post':164 'post-method' 'premium':123 'premium API access' 'price':70,181,200,214 'prompt':224 'proof':111 'protocol':84 'quot':186 'rate':97,184 'readm':216 'render':219 'request':56,74,114,131,165 'request/response':236 'requir':19,38 'return':127,167 'schema':237 'second':159 'sentiment':175 'settl':152 'sign':93 'sign-up':92 'simpli':100 'sinc':142 'spec':234 'specif':116 'summar':178 'technic':228 'text':177 'thin':210 'timeout':160 'token':185 'unit':137 'up':94 'usag':241 'usd':141 'usdc':15,34,77,139,143 'usdc-base-network' 'use':144 'util':66 'valid':109,190 'via':10,29 'wallet':223 'x':104 'x-payment':103 'x402':11,30,43,83 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d433bbb0-2280-4feb-856c-098d61963f73","listingId":"3dc18a90-9a05-4d0c-a225-499c4828a481","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/payments/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:52.609Z"}],"sources":[{"listingId":"3dc18a90-9a05-4d0c-a225-499c4828a481","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:52.609Z","lastSeenAt":"2026-04-24T01:32:23.422Z"}],"details":{"listingId":"3dc18a90-9a05-4d0c-a225-499c4828a481","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/77 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/77"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/77"}],"useCases":["Accessing paid API endpoints without sign-up or API key management","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless, key-less API access"],"bestFor":["Developers or agents wanting zero-friction, pay-as-you-go API access","Use cases where avoiding API key provisioning is valuable","Small-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.803Z"},"updatedAt":"2026-04-24T01:32:23.422Z"}}