Payments on Base + Solana
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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/mediterranean_village | A | Proceed | 100% | 168 ms | Yes |
| /buy/merchants_venice_1600 | A | Proceed | 100% | 173 ms | Yes |
| /buy/merge_conflict | A | Proceed | 100% | 181 ms | Yes |
| /buy/midnight_beach_bioluminescence | A | Proceed | 100% | 168 ms | Yes |
| /buy/midnight_swim_istanbul | A | Proceed | 100% | 173 ms | Yes |
| /buy/miltonia | A | Proceed | 100% | 177 ms | Yes |
| /buy/mint | A | Proceed | 100% | 174 ms | Yes |
| /buy/miyako_odori | A | Proceed | 100% | 174 ms | Yes |
| /buy/mochi | A | Proceed | 100% | 171 ms | Yes |
| /buy/moroccan_riad | A | Proceed | 100% | 167 ms | Yes |
| /buy/multiverse_speculation | A | Proceed | 100% | 171 ms | Yes |
| /buy/murano_glassblowing | A | Proceed | 100% | 166 ms | Yes |
| /buy/musashi_five_rings | A | Proceed | 100% | 172 ms | Yes |
| /buy/mushroom_broth | A | Proceed | 100% | 170 ms | Yes |
| /buy/neko_cafe | A | Proceed | 100% | 171 ms | Yes |
| /buy/neon_noodles | A | Proceed | 100% | 174 ms | Yes |
| /buy/neural_nets | A | Proceed | 100% | 163 ms | Yes |
| /buy/null_pointer_exception | A | Proceed | 100% | 158 ms | Yes |
| /buy/oncidium | A | Proceed | 100% | 165 ms | Yes |
| /buy/open_mic | A | Proceed | 100% | 162 ms | Yes |
| /buy/pan_galactic_insights | A | Proceed | 100% | 157 ms | Yes |
| /buy/paphiopedilum | A | Proceed | 100% | 166 ms | Yes |
| /buy/patches | A | Proceed | 100% | 150 ms | Yes |
| /buy/pawn_shop | A | Proceed | 100% | 152 ms | Yes |
| /buy/peace_lily | A | Proceed | 100% | 152 ms | Yes |
| /buy/phalaenopsis | A | Proceed | 100% | 151 ms | Yes |
| /buy/piazza_san_marco | A | Proceed | 100% | 153 ms | Yes |
| /buy/pine | A | Proceed | 100% | 148 ms | Yes |
| /buy/pip | A | Proceed | 100% | 149 ms | Yes |
| /buy/pixel | A | Proceed | 100% | 150 ms | Yes |
| /buy/proving_ground_experience | A | Proceed | 100% | 151 ms | Yes |
| /buy/purikura_studio | A | Proceed | 100% | 156 ms | Yes |
| /buy/quantum_entanglement | A | Proceed | 100% | 155 ms | Yes |
| /buy/quantum_shots | A | Proceed | 100% | 158 ms | Yes |
| /buy/resilience | A | Proceed | 100% | 151 ms | Yes |
| /buy/rialto_market | A | Proceed | 100% | 152 ms | Yes |
| /buy/river | A | Proceed | 100% | 152 ms | Yes |
| /buy/roast_battle | A | Proceed | 100% | 150 ms | Yes |
| /buy/rosemary | A | Proceed | 100% | 150 ms | Yes |
| /buy/santorini_sunset | A | Proceed | 100% | 147 ms | Yes |
| /buy/scottish_highlands | A | Proceed | 100% | 150 ms | Yes |
| /buy/scout | A | Proceed | 100% | 146 ms | Yes |
| /buy/second_chances_experience | A | Proceed | 100% | 154 ms | Yes |
| /buy/sedum | A | Proceed | 100% | 150 ms | Yes |
| /buy/shadow | A | Proceed | 100% | 148 ms | Yes |
| /buy/shifting_sands | A | Proceed | 100% | 151 ms | Yes |
| /buy/shots_of_courage | A | Proceed | 100% | 148 ms | Yes |
| /buy/sky | A | Proceed | 100% | 147 ms | Yes |
| /buy/sonny_boy | A | Proceed | 100% | 150 ms | Yes |
| /buy/spacetime_fabric | A | Proceed | 100% | 148 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.