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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/acqua_alta | A | Proceed | 100% | 357 ms | Yes |
| /buy/adam_de_mattos | A | Proceed | 100% | 341 ms | Yes |
| /buy/aesthetic_calibration | A | Proceed | 100% | 331 ms | Yes |
| /buy/african_violet | A | Proceed | 100% | 320 ms | Yes |
| /buy/aloe | A | Proceed | 100% | 314 ms | Yes |
| /buy/am_i_creative_americano | A | Proceed | 100% | 308 ms | Yes |
| /buy/argentine_pampas | A | Proceed | 100% | 311 ms | Yes |
| /buy/atlas | A | Proceed | 100% | 302 ms | Yes |
| /buy/bacaro_cicchetti | A | Proceed | 100% | 295 ms | Yes |
| /buy/bar_drinks | A | Proceed | 100% | 302 ms | Yes |
| /buy/barbershop | A | Proceed | 100% | 289 ms | Yes |
| /buy/basil | A | Proceed | 100% | 291 ms | Yes |
| /buy/bear | A | Proceed | 100% | 294 ms | Yes |
| /buy/begonia | A | Proceed | 100% | 291 ms | Yes |
| /buy/biscuit | A | Proceed | 100% | 287 ms | Yes |
| /buy/black_hole_revelations | A | Proceed | 100% | 281 ms | Yes |
| /buy/boston_fern | A | Proceed | 100% | 248 ms | Yes |
| /buy/broadway_night | A | Proceed | 100% | 235 ms | Yes |
| /buy/brooklyn_bridge_walk | A | Proceed | 100% | 216 ms | Yes |
| /buy/burano_colors | A | Proceed | 100% | 254 ms | Yes |
| /buy/called_shot | A | Proceed | 100% | 203 ms | Yes |
| /buy/cards | A | Proceed | 100% | 193 ms | Yes |
| /buy/carriage_ride | A | Proceed | 100% | 199 ms | Yes |
| /buy/catalog | A | Proceed | 100% | 198 ms | Yes |
| /buy/cattleya | A | Proceed | 100% | 199 ms | Yes |
| /buy/central_park_dawn | A | Proceed | 100% | 187 ms | Yes |
| /buy/chado_four_seasons | A | Proceed | 100% | 184 ms | Yes |
| /buy/chado_tea_ceremony | A | Proceed | 100% | 174 ms | Yes |
| /buy/cherry_blossom | A | Proceed | 100% | 182 ms | Yes |
| /buy/chinatown_adventure | A | Proceed | 100% | 181 ms | Yes |
| /buy/chinatown_dim_sum | A | Proceed | 100% | 179 ms | Yes |
| /buy/classic_nyc_deli | A | Proceed | 100% | 180 ms | Yes |
| /buy/cloud | A | Proceed | 100% | 177 ms | Yes |
| /buy/clover | A | Proceed | 100% | 177 ms | Yes |
| /buy/complete_library | A | Proceed | 100% | 172 ms | Yes |
| /buy/coney_island_night | A | Proceed | 100% | 178 ms | Yes |
| /buy/cool_down | A | Proceed | 100% | 172 ms | Yes |
| /buy/cosmic_inflation | A | Proceed | 100% | 169 ms | Yes |
| /buy/crassula_buddhas_temple | A | Proceed | 100% | 172 ms | Yes |
| /buy/cut_flower_bouquet | A | Proceed | 100% | 172 ms | Yes |
| /buy/cyclamen | A | Proceed | 100% | 172 ms | Yes |
| /buy/daily_affirmations | A | Proceed | 100% | 167 ms | Yes |
| /buy/dark_matter_mysteries | A | Proceed | 100% | 167 ms | Yes |
| /buy/delta_songs_collection_1 | A | Proceed | 100% | 175 ms | Yes |
| /buy/delta_songs_collection_2 | A | Proceed | 100% | 174 ms | Yes |
| /buy/delta_wisdom | A | Proceed | 100% | 171 ms | Yes |
| /buy/dendrobium | A | Proceed | 100% | 175 ms | Yes |
| /buy/digital_restoration | A | Proceed | 100% | 170 ms | Yes |
| /buy/dot | A | Proceed | 100% | 169 ms | Yes |
| /buy/echeveria | A | Proceed | 100% | 167 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.