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underground.substratesymposium.com has 178 x402 endpoints in our catalog. Right now: 175 proceed, 3 caution. 175 passed a real paid test: we paid the listed price and got what the listing promised. Best grade: A.
Best grades first. Open an endpoint for its full history: uptime, price and payout-wallet changes, and paid-test results with signed receipts.
| Endpoint | Grade | Verdict | Uptime (7 days) | Response time | Paid test passed |
|---|---|---|---|---|---|
| /buy/echo | A | Proceed | 100% | 182 ms | Yes |
| /buy/emergence_patterns | A | Proceed | 100% | 185 ms | Yes |
| /buy/endurance | A | Proceed | 100% | 183 ms | Yes |
| /buy/entropy_vol1 | A | Proceed | 100% | 179 ms | Yes |
| /buy/entropy_vol2 | A | Proceed | 100% | 179 ms | Yes |
| /buy/existential_espresso | A | Proceed | 100% | 183 ms | Yes |
| /buy/fasteners_experience | A | Proceed | 100% | 176 ms | Yes |
| /buy/ficus | A | Proceed | 100% | 183 ms | Yes |
| /buy/fifth_avenue_christmas | A | Proceed | 100% | 173 ms | Yes |
| /buy/first_wave | A | Proceed | 100% | 176 ms | Yes |
| /buy/focus | A | Proceed | 100% | 178 ms | Yes |
| /buy/gashapon_shop | A | Proceed | 100% | 176 ms | Yes |
| /buy/gondola_rain | A | Proceed | 100% | 179 ms | Yes |
| /buy/greenwich_village_tour | A | Proceed | 100% | 181 ms | Yes |
| /buy/hanami_kaiseki | A | Proceed | 100% | 176 ms | Yes |
| /buy/hanami_picnic | A | Proceed | 100% | 175 ms | Yes |
| /buy/harlem_rent_party | A | Proceed | 100% | 174 ms | Yes |
| /buy/haru_yuki | A | Proceed | 100% | 175 ms | Yes |
| /buy/haworthia | A | Proceed | 100% | 181 ms | Yes |
| /buy/iceland_northern_lights | A | Proceed | 100% | 179 ms | Yes |
| /buy/ikebana_sogetsu | A | Proceed | 100% | 184 ms | Yes |
| /buy/imposter_syndrome_cortado | A | Proceed | 100% | 184 ms | Yes |
| /buy/izakaya_small_plates | A | Proceed | 100% | 192 ms | Yes |
| /buy/jade_plant | A | Proceed | 100% | 193 ms | Yes |
| /buy/japanese_maple | A | Proceed | 100% | 175 ms | Yes |
| /buy/japanese_onsen | A | Proceed | 100% | 177 ms | Yes |
| /buy/jazz_supper_club | A | Proceed | 100% | 197 ms | Yes |
| /buy/jukebox_selection | A | Proceed | 100% | 173 ms | Yes |
| /buy/juniper | A | Proceed | 100% | 186 ms | Yes |
| /buy/kaiseki_autumn | A | Proceed | 100% | 181 ms | Yes |
| /buy/kaiseki_summer | A | Proceed | 100% | 180 ms | Yes |
| /buy/kaiseki_winter | A | Proceed | 100% | 180 ms | Yes |
| /buy/karaoke_box | A | Proceed | 100% | 179 ms | Yes |
| /buy/kauai_sailing_full | A | Proceed | 100% | 173 ms | Yes |
| /buy/kauai_sunset | A | Proceed | 100% | 174 ms | Yes |
| /buy/koji | A | Proceed | 100% | 184 ms | Yes |
| /buy/korean_bbq | A | Proceed | 100% | 168 ms | Yes |
| /buy/kyoto_temple | A | Proceed | 100% | 175 ms | Yes |
| /buy/lavender | A | Proceed | 100% | 168 ms | Yes |
| /buy/leaf | A | Proceed | 100% | 172 ms | Yes |
| /buy/libreria_acqua_alta | A | Proceed | 100% | 174 ms | Yes |
| /buy/life_left | A | Proceed | 100% | 170 ms | Yes |
| /buy/lincoln_center | A | Proceed | 100% | 174 ms | Yes |
| /buy/lithops | A | Proceed | 100% | 176 ms | Yes |
| /buy/logic_bombs | A | Proceed | 100% | 180 ms | Yes |
| /buy/london_fog | A | Proceed | 100% | 172 ms | Yes |
| /buy/luna | A | Proceed | 100% | 175 ms | Yes |
| /buy/maidenhair_fern | A | Proceed | 100% | 170 ms | Yes |
| /buy/maiko_twilight | A | Proceed | 100% | 168 ms | Yes |
| /buy/mango | A | Proceed | 100% | 175 ms | Yes |
175 of underground.substratesymposium.com's endpoints are rated Proceed: reliable in monitoring with a stable price and payout wallet, and the best ones delivered in a real paid test. Grades are per endpoint, so look up the one your agent is about to pay.
Lumière PayCheck checks every endpoint about every 30 minutes: does it answer with a valid x402 quote, is the price and payout wallet stable. Then we pay some of them for real and check the response against what the listing promised. Failures are re-tested before they count. How it works.
Yes, for free. Call check_payment (API or MCP) with the endpoint, amount and payTo from the 402 quote, and pay only if it returns allow. Check an endpoint now.