Bookproof
Read-only Polymarket market health: resolves a full Polymarket URL, slug, token ID, or search phrase, then returns spread, 1/2/5 cent depth, imbalance, fee schedule, and book freshness.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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": "payment_required",
"price": "$0.005 USDC",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x83f6EEaE1F332Ec627fAF6467a378118fb775752",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"endpoint": "GET /api/v1/market-health?market=<polymarket-url-slug-token-or-search>",
"x402Version": 2,
"freeResolver": "GET /api/v1/resolve-market?input=<polymarket-url-slug-token-or-search>"
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
Pay 0.005 USDC on Base to 0x83f6…75752. The signed payment is good for 1 minute.
- Paid to
- 0x83f6…75752
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 5000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x83f6EEaE1F332Ec627fAF6467a378118fb775752",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"pathParams": {},
"queryParams": {
"market": "https://polymarket.com/event/will-the-fed-decrease-interest-rates-by-25-bps-after-the-july-2026-meeting"
}
},
"output": {
"type": "json",
"example": {
"fee": {
"exponent": 1,
"takerOnly": true,
"takerRate": 0.04
},
"books": [
{
"spread": 0.01,
"bestAsk": 0.43,
"bestBid": 0.42,
"outcome": "Yes",
"imbalance2c": -0.12
}
],
"health": {
"stale": false,
"status": "healthy",
"crossed": false
},
"market": {
"slug": "will-the-fed-decrease-interest-rates-by-25-bps-after-the-july-2026-meeting"
},
"service": "bookproof"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"pathParams": {
"type": "object"
},
"queryParams": {
"type": "object",
"required": [
"market"
],
"properties": {
"market": {
"type": "string",
"maxLength": 500,
"minLength": 2,
"description": "Polymarket URL, market slug, CLOB token ID, or market search phrase."
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
},
"routeTemplate": ":var1"
}
}Provenance
- Seen in the source catalog
- 2026-09-19 16:01Z
- Last indexed by Roundhouse
- 2026-09-24 07:45Z
- Last enriched (probe, favicon, geo)
- 2026-09-19 17:15Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 402
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
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Bookproof 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=Bookproof' 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://bookproof-api.sn95wjq846.chatgpt.site/api/v1/market-health, 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.