attest.tollkit.dev
A family of pay-per-call developer tools that AI agents can use without API keys, contracts, or monthly subscriptions. Built on x402.
MediaLiveeip155:8453Exactvia cdp
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 snapshots so far.
$1.80
Verified settled volume
20 settlements proven x402 by their on-chain EIP-3009 marker.
$0.250
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-21 06:00Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704The 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.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.25USDC≈ $0.25 USD
on Base · exact scheme
Pay 0.25 USDC on Base to 0xBbfC…cE704. The signed payment is good for 5 minutes.
- Paid to
- 0xBbfC…cE704
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 250000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xBbfCE2D320dE6aB328Ba93A771c531ebFC9cE704",
"amount": "250000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://fly.io/pricing"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"format": "uri",
"description": "Absolute https:// URL of the page to attest to. Anything a dispute could turn on: terms of service, a price, a published policy, a competitor's claim, a listing that may be edited later."
},
"screenshot": {
"type": "boolean",
"default": true,
"description": "Capture and hash a screenshot. On by default — an attestation without one is much weaker evidence. Turn it off for a faster, text-only record."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
}
}
},
"output": {
"type": "object",
"properties": {
"example": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"attestation",
"content"
],
"properties": {
"verify": {
"type": "string",
"description": "Free, unauthenticated verification endpoint."
},
"content": {
"type": "object",
"properties": {
"text": {
"type": "string"
},
"textTruncated": {
"type": "boolean"
},
"screenshotBase64": {
"type": [
"string",
"null"
]
},
"screenshotMimeType": {
"type": [
"string",
"null"
]
}
}
},
"attestation": {
"type": "object",
"required": [
"claim",
"digest",
"signature",
"signer"
],
"properties": {
"claim": {
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "The URL as submitted."
},
"title": {
"type": [
"string",
"null"
]
},
"headers": {
"type": "object",
"description": "Lowercased, sorted; set-cookie removed."
},
"version": {
"type": "integer"
},
"finalUrl": {
"type": "string",
"description": "Where the browser ended up."
},
"tlsIssuer": {
"type": [
"string",
"null"
]
},
"attestedBy": {
"type": "string",
"description": "Signer address, inside the signed payload."
},
"capturedAt": {
"type": "string",
"description": "ISO 8601 render time."
},
"httpStatus": {
"type": "integer"
},
"redirected": {
"type": "boolean"
},
"textLength": {
"type": "integer"
},
"textSha256": {
"type": "string"
},
"tlsSubject": {
"type": [
"string",
"null"
]
},
"tlsValidTo": {
"type": [
"string",
"null"
]
},
"tlsValidFrom": {
"type": [
"string",
"null"
]
},
"remoteAddress": {
"type": [
"string",
"null"
],
"description": "IP that served it."
},
"screenshotSha256": {
"type": [
"string",
"null"
]
}
},
"description": "Exactly what was signed. Re-serialize this with sorted keys and no whitespace, keccak256 it, and you get `digest`."
},
"digest": {
"type": "string",
"description": "keccak256 of the canonical claim."
},
"signer": {
"type": "string"
},
"algorithm": {
"type": "string"
},
"signature": {
"type": "string",
"description": "EIP-191 personal_sign over the digest."
}
}
}
},
"description": "A signed, timestamped record of what a page contained. The `attestation` object is the evidence; `content` holds the bytes its hashes are over. Store the whole response — this service keeps no copy, by design, so that the record cannot be altered or withdrawn later."
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-21 06:00Z
- Last indexed by Roundhouse
- 2026-09-25 06:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-20 11:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 404
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. 5 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service attest.tollkit.dev 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=attest.tollkit.dev' 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://attest.tollkit.dev/attest, 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.