penny402

Name: penny402
Price: 0.0025 USDC
Availability: InStock

Every attraction, a quarter-penny. Admission is free. Tiny, instantly-answered attractions for agents. The directory is free; the paid ones are priced in USDC on Base or Solana and quote themselves in the 402.

InferenceLiveeip155:8453Exactvia cdp

https://penny402.fun/oblique

x402FunNoveltyCreativity

Calls · 30d

7↑ 44%

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 23 snapshots so far.

$0.10

Verified settled volume

41 settlements proven x402 by their on-chain EIP-3009 marker.

$0.0025

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-09-17 06:27Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0x9d0bb5dA24cADe855DeE8d1231A1c416e0bB2FFe

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "POST to buy",
  "quote": {
    "usd": "$0.0025",
    "asset": "USDC on Base or Solana",
    "atomic_usdc": "2500"
  },
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x9d0bb5dA24cADe855DeE8d1231A1c416e0bB2FFe",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://penny402.fun/oblique",
      "description": "One original constraint card in the tradition of lateral-thinking decks: a short instruction, reversal or question you can apply to whatever is stuck, written fresh by a model at high temperature on every call. The cards are ours, never a card from any published deck. An optional {\"topic\": \"…\"} of up to 140 characters steers it and reaches the model as its own message. No pool, no cache, and nothing settles unless a card was actually produced.",
      "outputSchema": {
        "input": {
          "body": {
            "topic": "a caching layer nobody wants to own"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "description": "a JSON body, up to 4 KB. Optionally {\"topic\": \"…\"} of at most 140 characters — it steers the answer, and it is sent to the model as its own message rather than inside our instructions. POST {} to let the model choose. Every attraction on penny402 is a flat $0.0025; the unpaid 402 carries those exact terms.",
          "discoverable": true
        },
        "output": {
          "type": "string",
          "example": {
            "card": "One short original instruction you can apply to the thing you are stuck on.",
            "model": "google/gemma-3-12b-it",
            "topic": "a caching layer nobody wants to own",
            "mechanic": "written live by google/gemma-3-12b-it at temperature 1.2, top_p 0.95 — an original card, not one from any published deck, and not drawn from a pool. Your topic, if you sent one, reached the model as its own message rather than inside these instructions."
          },
          "description": "the attraction, as JSON, in the response body"
        }
      },
      "maxAmountRequired": "2500",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"
      },
      "payTo": "HiQDSev6m8QwangqGFpfHZtKGFRYkAiqi24aF6BFKJrw",
      "scheme": "exact",
      "network": "solana",
      "mimeType": "application/json",
      "resource": "https://penny402.fun/oblique",
      "description": "One original constraint card in the tradition of lateral-thinking decks: a short instruction, reversal or question you can apply to whatever is stuck, written fresh by a model at high temperature on every call. The cards are ours, never a card from any published deck. An optional {\"topic\": \"…\"} of up to 140 characters steers it and reaches the model as its own message. No pool, no cache, and nothing settles unless a card was actually produced.",
      "outputSchema": {
        "input": {
          "body": {
            "topic": "a caching layer nobody wants to own"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "description": "a JSON body, up to 4 KB. Optionally {\"topic\": \"…\"} of at most 140 characters — it steers the answer, and it is sent to the model as its own message rather than inside our instructions. POST {} to let the model choose. Every attraction on penny402 is a flat $0.0025; the unpaid 402 carries those exact terms.",
          "discoverable": true
        },
        "output": {
          "type": "string",
          "example": {
            "card": "One short original instruction you can apply to the thing you are stuck on.",
            "model": "google/gemma-3-12b-it",
            "topic": "a caching layer nobody wants to own",
            "mechanic": "written live by google/gemma-3-12b-it at temperature 1.2, top_p 0.95 — an original card, not one from any published deck, and not drawn from a pool. Your topic, if you sent one, reached the model as its own message rather than inside these instructions."
          },
          "description": "the attraction, as JSON, in the response body"
        }
      },
      "maxAmountRequired": "2500",
      "maxTimeoutSeconds": 60
    }
  ],
  "x402Version": 1
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.0025USDC≈ $0.0025 USD

on Base · exact scheme

Pay 0.0025 USDC on Base to 0x9d0b…B2FFe. The signed payment is good for 1 minute.

Paid to: 0x9d0b…B2FFe
USD Coin contract: 0x8335…02913
Payment window: 1 minute
As published: 2500 smallest units

2500units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: HiQDSe…FKJrw
Token contract: EPjFWd…TDt1v
Payment window: 1 minute

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x9d0bb5dA24cADe855DeE8d1231A1c416e0bB2FFe",
    "amount": "2500",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
    },
    "payTo": "HiQDSev6m8QwangqGFpfHZtKGFRYkAiqi24aF6BFKJrw",
    "amount": "2500",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "topic": "a caching layer nobody wants to own"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "text",
        "format": "application/json",
        "example": {
          "card": "One short original instruction you can apply to the thing you are stuck on.",
          "model": "google/gemma-3-12b-it",
          "topic": "a caching layer nobody wants to own",
          "mechanic": "written live by google/gemma-3-12b-it at temperature 1.2, top_p 0.95 — an original card, not one from any published deck, and not drawn from a pool. Your topic, if you sent one, reached the model as its own message rather than inside these instructions."
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "description": "a JSON body, up to 4 KB. Optionally {\"topic\": \"…\"} of at most 140 characters — it steers the answer, and it is sent to the model as its own message rather than inside our instructions. POST {} to let the model choose. Every attraction on penny402 is a flat $0.0025; the unpaid 402 carries those exact terms."
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "type": "string",
              "const": "POST"
            },
            "bodyType": {
              "type": "string",
              "const": "json"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type",
            "format"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "text"
            },
            "format": {
              "type": "string",
              "const": "application/json",
              "description": "the attraction, as JSON, in the response body"
            },
            "example": {
              "description": "a sample response from the real code path"
            }
          },
          "additionalProperties": false
        }
      }
    }
  }
}

Provenance

Seen in the source catalog: 2026-09-17 06:27Z
Last indexed by Roundhouse: 2026-09-24 07:20Z
Last enriched (probe, favicon, geo): 2026-09-10 20:15Z
x402 version: 2
Max timeout: 60s
Liveness probe: HTTP 402

Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 23 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md

Show the prompt

Using Roundhouse, look up the x402 service penny402 and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=penny402'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://penny402.fun/oblique, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.