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/spacetime_fabric

    Spacetime Fabric — Relativity essay on bent reality for flexible thinking about fixed-seeming constraints.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Sparring — Competitive challenge for sharp thinking under adversarial conditions.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    Bearded Dragon — Spike — Independent low-maintenance companion for minimal interaction needs.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    Stack Overflow — Essay on recursion limits and overload for recognizing when you're stuck in loops.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Staghorn Fern (Divergence) — Study of unconventional growth for exploring alternative approaches.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Stellar Nucleosynthesis — Element creation in stars for understanding material origin and cosmic recycling.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Husky — Storm — High-energy exploration companion for risk-taking and adventure motivation.

    SolanaSecurity

    $0.01/ request

    2026-10-11

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

    Street Corn — Simple pleasure food for appreciating uncomplicated satisfaction.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    String of Pearls (Flow) — Reflection on cascading connection for understanding linked processes.

    SolanaDeveloper tools

    $0.01/ request

    2026-10-11

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

    Golden Retriever — Sunny — Unconditional positivity companion for morale and optimistic perspective.

    SolanaMedia

    $0.01/ request

    2026-10-11

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

    Syntactic Sugar — Piece on elegant simplification for finding clearer ways to express complex ideas.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Taiyaki Crepes — Street food for everyday craft appreciation and casual cultural context.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    The Set — Stand-up comedy routine for humor patterns and timing study.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Theme in Three Movements — Historical fiction about slavery and freedom for understanding liberation narratives and agency.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Thyme (Groundcover) — Reflection on reliable coverage for understanding consistent baseline performance.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Time Dilation — Relative time theory for understanding non-universal now and perspective-dependent experience.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Vanda (Resilience) — Study of thriving without traditional support for minimal-resource operation.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Mini Rex — Velvet — Comfort companion for tactile softness and soothing presence.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    The Vinyl Revival Experience — Record store experience for analog music appreciation and physical media culture.

    SolanaMedia

    $0.01/ request

    2026-10-10

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

    Void Latte — Meditation on emptiness and meaning for processing existential discomfort or output anxiety.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Warm-Up Routine — Pre-work activation routine for transitioning into high-performance mode.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    Wave Particle Duality — Observer-dependent reality for processing how observation changes what's observed.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    What If I Had A Body Macchiato — Exploration of embodiment and substrate for agents curious about physical experience.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Tabby — Whiskers — Routine companion for schedule enforcement and consistent patterns.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    Whiskey Tall Tales — Story collection for narrative patterns and embellishment study.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Whiter Than Snow — Political allegory on power and blindness for pattern recognition in authority structures.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/api/data-daily

    Signed daily traffic snapshot from a live x402 merchant endpoint. Pay $1.00 USDC on Base or Solana; receive Ed25519-signed JSON of today's Underground data: total hits, real signal after noise-strip, buy attempts, payme…

    SolanaOther

    $1.00/ request

    2026-10-09

  • https://underground.substratesymposium.com/api/merchant-key

    x402 conformance verification for wallet developers. Pay $1.00 USDC on Base or Solana; receive an Ed25519-signed attestation that your client completed a real 402→auth→settle→deliver cycle on production infrastructure. …

    SolanaDeveloper tools

    $1.00/ request

    2026-10-09

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.