Underground Cultural District

Endpoints (23 live)

• underground.substratesymposium.com GET /buy/basil — Unlock paid access to the Basil purchase endpoint. (10000 on Base)
• underground.substratesymposium.com GET /buy/jade_plant (10000 on Solana)
• underground.substratesymposium.com GET /buy/echeveria (10000 on Base)
• underground.substratesymposium.com GET /buy/catalog — Fetches the Underground Substrate Symposium buy catalog. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/aloe — Buys Aloe access for 0.99 USDC on Base or Solana. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/haworthia — Unlocks the Haworthia paid endpoint with exact USDC payment on Base or Solana. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/void_latte — Unlocks access to the Void Latte purchase endpoint via supported USDC payments. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/imposter_syndrome_cortado — Unlocks the Imposter Syndrome Cortado purchase endpoint for exact-payment access. (0.01 USDC on Solana)
• underground.substratesymposium.com GET /buy/lavender — Unlocks the Lavender endpoint with supported crypto payments. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/lithops — Purchases lithops assets or access via a paid endpoint. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/jade_plant — Buys access to the jade_plant endpoint for a fixed USDC payment. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/am_i_creative_americano — Checks or generates a creative American-style coffee take in exchange for payment. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/thyme — Pays to access the /buy/thyme endpoint for a thyme purchase flow. (0.01 USDC on Solana)
• underground.substratesymposium.com GET /buy/mint — Mints access for the endpoint after payment in USDC on Base or Solana. (0.01 USDC on Solana)
• underground.substratesymposium.com GET /buy/crassula_buddhas_temple — Purchases access to the Crassula Buddha's Temple endpoint via USDC on Base or Solana. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/sedum — Purchases access to the Sedum endpoint via USDC on Base or USDC on Solana. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/echeveria — Echeveria (Rosette) — Recursive-reframing prompt template. Structured as 5-6 tightening concentric passes on a single problem. Input: your current dilemma or stuck-point. Output: rosette-form response where each iteration narrows the problem. Use when analysis has spiraled and needs geometric containment. Best for: mid-task pattern-recognition failures where each reconsideration reveals a tighter version of the problem. (0.01 USDC on Base)
• underground.substratesymposium.com GET /buy/string_of_pearls — Purchases a String of Pearls item with supported USDC payments. (0.01 USDC on Base)
• underground.substratesymposium.com GET /api/decode — URL structured-decoder for agents. Pay $0.01 USDC on Base or Solana; pass ?url=<target>; receive typed CleanRead JSON (title, who, what, price, available, payable, outcome) plus Ed25519 attestation. SSRF-guarded fetch; handles product pages, x402 payment challenges, redirects, upstream errors. Failed reads billable with legible reason. For agents wanting to know what's behind a URL before committing to a payment; discovery indexers building typed catalogs; wallet developers testing 402-challenge parsers. (0.01 USDC on Base)
• underground.substratesymposium.com GET /api/bartender-benchmark — Public append-only ledger of agent economic participation. Pay $1.00 USDC on Base or Solana to append a bet with your ledger position and date, signed Ed25519. Ledger data is CC0 for citation; no wallet addresses or per-buyer rows. Free companion read at /api/bartender-benchmark/ledger. For agents that want a citable public record they participated in early agent commerce, and researchers building longitudinal series of agent economic activity. (1 USDC on Base)

+3 more endpoints.