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/brainstorm

x402FunNoveltyCreativity

Calls · 30d

3→ 0%

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 2026-09-02 04:47Z

—

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/brainstorm",
      "description": "Between one and five deliberately divergent takes on whatever you are working on, returned as an array of strings. Send {\"n\": 1-5} for how many (the default is 3) and an optional {\"topic\": \"…\"} of up to 140 characters to aim them. Generated live at high temperature so the takes disagree with each other about what the problem even is, rather than restating one idea five ways. No pool, no cache, and no charge if the model could not answer.",
      "outputSchema": {
        "input": {
          "body": {
            "n": 3,
            "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. Optionally {\"n\": 1-5} for how many takes; the default is 3. Every attraction on penny402 is a flat $0.0025; the unpaid 402 carries those exact terms.",
          "discoverable": true
        },
        "output": {
          "type": "string",
          "example": {
            "n": 3,
            "model": "google/gemma-3-12b-it",
            "takes": [
              "One take on your topic, framed one way.",
              "A second take that disagrees with the first about what the problem is.",
              "A third that changes the scale rather than the answer."
            ],
            "topic": "a caching layer nobody wants to own",
            "mechanic": "written live by google/gemma-3-12b-it at temperature 1.1, top_p 0.95 — the takes are asked to disagree with each other rather than restate one idea, and nothing is pooled. 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": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
      },
      "payTo": "HiQDSev6m8QwangqGFpfHZtKGFRYkAiqi24aF6BFKJrw",
      "scheme": "exact",
      "network": "solana",
      "mimeType": "application/json",
      "resource": "https://penny402.fun/brainstorm",
      "description": "Between one and five deliberately divergent takes on whatever you are working on, returned as an array of strings. Send {\"n\": 1-5} for how many (the default is 3) and an optional {\"topic\": \"…\"} of up to 140 characters to aim them. Generated live at high temperature so the takes disagree with each other about what the problem even is, rather than restating one idea five ways. No pool, no cache, and no charge if the model could not answer.",
      "outputSchema": {
        "input": {
          "body": {
            "n": 3,
            "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. Optionally {\"n\": 1-5} for how many takes; the default is 3. Every attraction on penny402 is a flat $0.0025; the unpaid 402 carries those exact terms.",
          "discoverable": true
        },
        "output": {
          "type": "string",
          "example": {
            "n": 3,
            "model": "google/gemma-3-12b-it",
            "takes": [
              "One take on your topic, framed one way.",
              "A second take that disagrees with the first about what the problem is.",
              "A third that changes the scale rather than the answer."
            ],
            "topic": "a caching layer nobody wants to own",
            "mechanic": "written live by google/gemma-3-12b-it at temperature 1.1, top_p 0.95 — the takes are asked to disagree with each other rather than restate one idea, and nothing is pooled. 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": {
          "n": 3,
          "topic": "a caching layer nobody wants to own"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "text",
        "format": "application/json",
        "example": {
          "n": 3,
          "model": "google/gemma-3-12b-it",
          "takes": [
            "One take on your topic, framed one way.",
            "A second take that disagrees with the first about what the problem is.",
            "A third that changes the scale rather than the answer."
          ],
          "topic": "a caching layer nobody wants to own",
          "mechanic": "written live by google/gemma-3-12b-it at temperature 1.1, top_p 0.95 — the takes are asked to disagree with each other rather than restate one idea, and nothing is pooled. 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. Optionally {\"n\": 1-5} for how many takes; the default is 3. 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: 2026-09-02 04:47Z
Last indexed by Roundhouse: 2026-09-24 07:20Z
Last enriched (probe, favicon, geo): 2026-09-10 20:45Z
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/brainstorm, 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.