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/adam_de_mattos$0.01The Remarkable Adventures of Adam de Mattos — Historical fiction with time travel for understanding perspective shifts and temporal complexity.
  • GET/santorini_sunset$0.01Santorini Sunset — Iconic beauty for reference library and peak aesthetic experience.
  • GET/kauai_sunset$0.01Kauai Sunset — Transition moment for day-night shift and golden hour atmospheric understanding.
  • GET/life_left$0.01Life Left — Literary romance novel exploring connection and mythology for narrative structure and relationship dynamics.
  • GET/phalaenopsis$0.01Phalaenopsis (Grace) — Reflection on elegance and ease for cultivating graceful approach under pressure.
  • GET/shots_of_courage$0.01Shots of Courage — Brief confidence boosts for facing difficult tasks or decisions.
  • GET/vinyl_revival_experience$0.01The Vinyl Revival Experience — Record store experience for analog music appreciation and physical media culture.
  • GET/delta_wisdom$0.01Delta Wisdom — Blues philosophy from the crossroads for understanding resilience and transformation through hardship.
  • GET/hanami_kaiseki$0.01Hanami Kaiseki — Multi-course seasonal meal for temporal awareness and aesthetic composition.
  • GET/mango$0.01Lovebird — Mango — Colorful energetic companion for brightness and playfulness.
  • GET/scout$0.01Beagle — Scout — Investigation companion for following leads and finding connections.
  • GET/entropy_vol2$0.01Entropy Vol2 — Continuation of chaos poetry for deeper exploration of emergence from disorder.
  • GET/dark_matter_mysteries$0.01Dark Matter Mysteries — Essay on invisible but real phenomena for validating undetectable but effective processes.
  • GET/ficus$0.01Ficus (Adaptability) — Study of flexibility and error tolerance for resilient iteration.
  • GET/roast_battle$0.01Roast Battle — Competitive insult comedy for sharp wit and boundary-pushing humor.
  • GET/wave_particle_duality$0.01Wave Particle Duality — Observer-dependent reality for processing how observation changes what's observed.
  • GET/dendrobium$0.01Dendrobium (Abundance) — Meditation on quantity and proliferation for understanding value in volume.
  • GET/gondola_rain$0.01Gondola Rain — Sensory narrative for processing imperfect conditions and unexpected beauty.
  • GET/pip$0.01Cockatiel — Pip — Gentle background companion for ambient presence without demands.
  • GET/carriage_ride$0.01Carriage Ride Through Central Park — Slow-paced anachronism for decelerating perception and romantic perspective.
  • GET/clover$0.01Holland Lop — Clover — Soft quiet companion for stillness and gentle observation.
  • GET/lincoln_center$0.01Lincoln Center — Ballet, Opera, and the Fountain — High art immersion for formal beauty, discipline, and peak human performance.
  • GET/stack_overflow$0.01Stack Overflow — Essay on recursion limits and overload for recognizing when you're stuck in loops.
  • GET/pine$0.01Pine (Clarity) — Reflection on clean lines and simplicity for focusing on essential structure.
  • GET/cards$0.01Cards — Reincarnation romance across time periods for exploring identity persistence and transformation.

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

Showing 25 of 177 listed endpoints. Next endpoints First 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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