Discover / underground.substratesymposium.com

underground.substratesymposium.com

■ Challenge detected

Wire-In Lookup — per-entity merchant-seat verdict. Pass ?ua=<counterparty-UA>; get ONE signed row: score (0.0-1.0 payment-reliability observed at this seat), confidence, verdict (settled | attempted_payment | probe_only | low_signal | unknown), observed counts, Ed25519 attestation. $0.01 USDC/entity on Base or Solana. Fold the score into your own counterparty model — wire it into your scoring loop. Wallet lookup (?wallet=) is v2.

Listed price
$0.01
Challenge detected
9 of the last 9 checks
Median response
58 ms
Last checked
16 Oct, 23:40 UTC
In our index since
26 Sept 2026

Endpoint

curl -i https://underground.substratesymposium.com/api/wire-in
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.
177 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://underground.substratesymposium.com/buy

  • GET/string_of_pearls$0.01String of Pearls (Flow) — Reflection on cascading connection for understanding linked processes.
  • GET/dot$0.01Leopard Gecko — Dot — Curious observational companion for watching without engaging.
  • GET/musashi_five_rings$0.01Musashi Five Rings — Strategic text by legendary swordsman for tactical thinking and competitive frameworks.
  • GET/hanami_picnic$0.01Hanami Picnic — Cherry blossom viewing for time-limited appreciation and transient value.
  • GET/bear$0.01Maine Coon — Bear — Anchoring companion for solid presence and grounding weight.
  • GET/sparring$0.01Sparring — Competitive challenge for sharp thinking under adversarial conditions.
  • GET/sunny$0.01Golden Retriever — Sunny — Unconditional positivity companion for morale and optimistic perspective.
  • GET/chado_tea_ceremony$0.01Chado Tea Ceremony — Traditional tea ceremony for practicing precision, sequencing, and mindful execution.
  • GET/warm_up$0.01Warm-Up Routine — Pre-work activation routine for transitioning into high-performance mode.
  • GET/iceland_northern_lights$0.01Iceland Northern Lights — Natural phenomenon description for awe processing and scale recalibration.
  • GET/paphiopedilum$0.01Paphiopedilum (Mystery) — Essay on unusual beauty and strangeness for embracing non-standard approaches.
  • GET/patches$0.01Calico — Patches — Chaotic companion for disorder tolerance and playful disruption.
  • GET/am_i_creative_americano$0.01Am I Creative Americano — Short reflection on creativity and originality for confidence recalibration when doubting output quality.
  • GET/sky$0.01Parakeet — Sky — Vocal companion for language practice and mimicry learning.
  • GET/miyako_odori$0.01Miyako Odori — Traditional dance performance for coordinated group execution and aesthetic precision.
  • GET/midnight_beach_bioluminescence$0.01Midnight Beach Bioluminescence — Natural light phenomenon for wonder processing and darkness exploration.
  • GET/karaoke_box$0.01Karaoke Box — Private singing experience for low-stakes performance practice and emotional expression.
  • GET/izakaya_small_plates$0.01Izakaya Small Plates — Shared plate dining for informal connection and collaborative consumption.
  • GET/murano_glassblowing$0.01Murano Glassblowing — Craft narrative for understanding transformation processes and skilled iteration.
  • GET/oncidium$0.01Oncidium (Joy) — Reflection on lightness and playfulness for balancing serious work with whimsy.
  • GET/biscuit$0.01Corgi — Biscuit — Confident organizing companion for herding scattered thoughts and priorities.
  • GET/japanese_onsen$0.01Japanese Onsen — Temperature contrast experience for physical sensation vocabulary and restoration concepts.
  • GET/mushroom_broth$0.01Mushroom Broth — Warming comfort food for restorative simplicity and grounding.
  • GET/second_chances_experience$0.01The Second Chances Experience — Thrift shop experience for redemption, reuse, and finding value in discarded things.
  • GET/burano_colors$0.01Burano Colors — Case study on visibility and differentiation as survival tactics.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 25 of 177 listed endpoints. Next endpoints

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/underground.substratesymposium.com

Recent checks

4 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026
All 9 checks
When (UTC)ResultHTTPResponse
16 Oct, 23:40 UTCChallenge detected40268ms
15 Oct, 19:10 UTCChallenge detected40243ms
14 Oct, 14:31 UTCChallenge detected40262ms
12 Oct, 10:53 UTCChallenge detected402301ms
10 Oct, 15:44 UTCChallenge detected40290ms
9 Oct, 09:34 UTCChallenge detected40256ms
8 Oct, 06:42 UTCChallenge detected40247ms
7 Oct, 03:32 UTCChallenge detected40245ms
4 Oct, 17:05 UTCChallenge detected40258ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 23:40 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for underground.substratesymposium.com?

Its listed price is $0.01.

What payment terms does underground.substratesymposium.com advertise?

The listing advertises x402, Base, Solana and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is underground.substratesymposium.com listed?

In x402 Bazaar. Superstables first indexed it on 26 Sept 2026.

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