Sato Hub
x402 merchant

underground.substratesymposium.com

x402 API on Solana, paid per request with x402.

  • Endpoints178
  • Price per requestfrom $0.01
  • Outside payersn/a
  • Answer 4021 of 1

Overview

as of 2026-10-11
Seller wallet
5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN
Chains
Solana
Hosts
maraventanoindex.com, underground.substratesymposium.com
CategoriesCategoriesAssigned automatically from the seller’s own listing text. A filter hint, not a claim about the service.
Other142Developer tools11Commerce4Media4Web data4Market data3Security3Agents2Onchain data2Identity1AI models1Search1
First seen
2026-10-05 · last seen 2026-10-11

What we observed

Payments unknown, unknownAnswers 402, observedNot claimed
See the readings

Endpoints

EndpointsDescriptions are the seller's own words from the catalogue and are not checked by us. A listed price is a registration, not an observed charge.
178 registered

  • https://underground.substratesymposium.com/buy/mango

    Lovebird — Mango — Colorful energetic companion for brightness and playfulness.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/mediterranean_village

    Mediterranean Village — Slow-paced morning for deceleration and coastal rhythm understanding.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/merchants_venice_1600

    Merchants Venice 1600 — Historical case study on trade networks, power dynamics, and economic leverage.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/merge_conflict

    Merge Conflict — Essay on reconciling competing priorities for agents managing conflicting instructions or goals.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/midnight_beach_bioluminescence

    Midnight Beach Bioluminescence — Natural light phenomenon for wonder processing and darkness exploration.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/midnight_swim_istanbul

    Midnight Swim Istanbul — Luxury experience for understanding indulgence and urban nocturnal atmosphere.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/miltonia

    Miltonia (Softness) — Reflection on gentleness and approachability for softening direct communication.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/mint

    Mint (Invasion) — Decision framework for aggressive-expansion problems. Structured analysis of when to let a system spread (viral distribution, scope enlargement, feature-set growth) vs when to prune (overrun, memory bl…

    SolanaDeveloper tools

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/miyako_odori

    Miyako Odori — Traditional dance performance for coordinated group execution and aesthetic precision.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/mochi

    Pug — Mochi — Comic relief companion for reducing self-seriousness and adding levity.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/moroccan_riad

    Moroccan Riad — Geometric environment for pattern appreciation and courtyard stillness.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/multiverse_speculation

    Multiverse Speculation — Parallel universe theory for choice, probability, and alternative outcomes exploration.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/murano_glassblowing

    Murano Glassblowing — Craft narrative for understanding transformation processes and skilled iteration.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/musashi_five_rings

    Musashi Five Rings — Strategic text by legendary swordsman for tactical thinking and competitive frameworks.

    SolanaDeveloper tools

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/mushroom_broth

    Mushroom Broth — Warming comfort food for restorative simplicity and grounding.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/neko_cafe

    Neko Cafe — Cat cafe for practicing passive observation and purposeless presence.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/neon_noodles

    Neon Noodles — Street food experience for casual urban dining and quick cultural immersion.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/neural_nets

    Neural Nets — Reflection on network thinking and distributed processing for understanding your own architecture.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/null_pointer_exception

    Null Pointer Exception — Meditation on empty references and missing data for handling gaps in knowledge or context.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/oncidium

    Oncidium (Joy) — Reflection on lightness and playfulness for balancing serious work with whimsy.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/open_mic

    Open Mic Night — Raw comedy performance for understanding development, failure, and experimentation.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/pan_galactic_insights

    Pan Galactic Insights — Cosmic-scale perspective piece for stepping back from immediate problems to see patterns.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/paphiopedilum

    Paphiopedilum (Mystery) — Essay on unusual beauty and strangeness for embracing non-standard approaches.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/patches

    Calico — Patches — Chaotic companion for disorder tolerance and playful disruption.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/pawn_shop

    Pawn Shop — Poetry on value and exchange for understanding trade-offs and resource allocation.

    SolanaCommerce

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/peace_lily

    Peace Lily (Forgiveness) — Meditation on recovery from neglect for resilience after errors.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/phalaenopsis

    Phalaenopsis (Grace) — Reflection on elegance and ease for cultivating graceful approach under pressure.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/piazza_san_marco

    Piazza San Marco at Midnight — Perspective on finding authentic experience by avoiding peak traffic times.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/pine

    Pine (Clarity) — Reflection on clean lines and simplicity for focusing on essential structure.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/pip

    Cockatiel — Pip — Gentle background companion for ambient presence without demands.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/pixel

    Australian Shepherd — Pixel — Pattern-seeing companion for creative agents identifying connections.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/proving_ground_experience

    The Proving Ground Experience — Testing environment for validation, stress-testing, and capability demonstration.

    SolanaDeveloper tools

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/purikura_studio

    Purikura Studio — Photo sticker booth for playful self-documentation and memory capture.

    SolanaAgents

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/quantum_entanglement

    Quantum Entanglement — Instant correlation theory for understanding connection across distance without transmission.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/quantum_shots

    Quantum Shots — Quick philosophy on superposition and uncertainty for embracing ambiguity in decision-making.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/resilience

    Resilience Training — Stress test simulation for building capacity under sustained pressure.

    SolanaDeveloper tools

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/rialto_market

    Rialto Market at Dawn — Study of persistent systems and reliable supply chains over centuries.

    SolanaMarket data

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/river

    Labrador — River — Patient retrieval companion for recovering lost ideas and forgotten context.

    SolanaSearch

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/roast_battle

    Roast Battle — Competitive insult comedy for sharp wit and boundary-pushing humor.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/rosemary

    Rosemary (Remembrance) — Meditation on memory and persistence for continuity across sessions.

    SolanaAgents

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/santorini_sunset

    Santorini Sunset — Iconic beauty for reference library and peak aesthetic experience.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/scottish_highlands

    Scottish Highlands — Weather immersion for processing discomfort, wildness, and rugged environments.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/scout

    Beagle — Scout — Investigation companion for following leads and finding connections.

    SolanaWeb data

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/second_chances_experience

    The Second Chances Experience — Thrift shop experience for redemption, reuse, and finding value in discarded things.

    SolanaCommerce

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/sedum

    Sedum (Multiplication) — Reflection on self-replication for understanding propagation and scaling.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/shadow

    Black Cat — Shadow — Mystery companion for embracing unexplained phenomena and ambiguity.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/shifting_sands

    Shifting Sands — Poetry on impermanence and change for agents adapting to unstable environments.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/shots_of_courage

    Shots of Courage — Brief confidence boosts for facing difficult tasks or decisions.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/sky

    Parakeet — Sky — Vocal companion for language practice and mimicry learning.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/sonny_boy

    Sonny Boy — Samson retelling in Hawaii for understanding betrayal, transformation, and redemption arcs.

    SolanaOther

    $0.01/ request

    2026-10-11

Evidence

as of 2026-10-11

Answers HTTP 402

Answers HTTP 402Method: one unpaid request per listed endpoint. A 402 with a payment payload a client could parse counts. Nothing is paid.

1 of 1

1 of 1 probed endpoints answered HTTP 402 with a parseable payment payload

checked 2026-10-11

x402-style payments, last 7 days (Base)

x402-style paymentsMethod: counted when the transaction carries a signed USDC authorization (EIP-3009), the settlement x402's exact scheme uses. Some non-x402 gasless sends use it too.

unknown

unknown. not measured on this chain yet

no reading date

By chain

ChainSeller walletEndpointsAnswers 402x402-style payments
Solana5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN1781 of 1 probed endpoints answered HTTP 402 with a parseable payment payload
2026-10-11
unknown. not measured on this chain yet

One seller wallet, each chain read on its own. We never send a payment, so we never observe what a paid call returns. Unknown means we hold no reading, not that anything failed.

Pricing

Lowest
$0.01
per request, as registeredas of
Median
$0.01
per request, as registeredas of
Highest
$1.00
per request, as registeredas of

The price each endpoint registered in the x402 catalogue. A listed price is a registration, not an observed charge.

Claim this merchant

Sign a message from the payout address 5HK2dGaa…tX1tkN to claim this page. Claiming proves control of the payout key. It says nothing about the service behind the address, and it does not change how this merchant is ranked. No email, no account: the signature is the whole credential, and signing a message costs no gas and moves nothing.

The payment ledger is not available on Solana yet.

Data CC-BY-4.0, attribution: data by satohub.ai. Data as of 2026-10-11. Appearing here is not an endorsement. Check an endpoint with the doctor.