Server description (copied; language not verified)
Purpose: a signed settlement attestation for an x402 payment on Base, Polygon or Solana, a signed x402 conformance audit, x402 endpoint monitoring, a signed x402 payment client test, an x402 launch check, or a Bitcoin timestamp — have a disinterested third party go and look at something, then sign what it saw: whether a URL still answered hours later, or what the chain says about a settlement. To record what an agent was authorized to do before it spends, which observes nothing and is a different verb, the tool is buy_mandate. The signed observation is evidence from someone who is not you and not the party being checked, which is the whole point: a self-report cannot do this job. Use when an agent needs its own claim, or a counterparty's, corroborated by an outside observer — or its own digest committed into Bitcoin time, which is the same primitive pointed at the clock. Prices run $0.001 to $49 depending on item_id.
Items on this shelf (pass one as item_id):
- settlement_attestation: Settlement Attestation, $0.004 fixed, one-off, instant. Prove to a third party that a payment actually settled on chain
- settlement_reconciliation: Settlement Reconciliation, $0.006 fixed, one-off, instant. Observe an agent payment's USDC movement against an attributable fixed value or a declared ceiling, stating when no cap is observable
- the_case_file: The Case File, $0.25 fixed, one-off, instant. Hand the person deciding what went wrong with one agent purchase everything a neutral party observed about it, in one signed file, with what it did not observe stated
- attestation_bundle: A Sheaf of Attestations, $0.05 fixed, one-off, instant. Prove a whole run of payments settled, one signed receipt per transaction
- standing_watch: The Night Watch, $5 fixed, covering a 7-day term, one payment, instant. Monitor my x402 endpoint hourly for a week with signed uptime history
- service_audit: The Once-Over, $5 fixed, one-off, instant. Get a signed point-in-time audit of an x402 endpoint that I can hand to a third party
- a2a_repair_kit: The A2A Repair Kit, $49 fixed, one-off, instant. Find reproducible failures in my A2A agent and hand my developer tested repair instructions
- good_buyer: The Good Buyer, $0.99 fixed, one-off, instant. Find out whether my own x402 client will actually pay a door before I spend a round trip on it, and get that dated and signed
- conformance_watch: The Conformance Watch, $5 fixed, covering a 7-day term, one payment, instant. Catch a deploy quietly breaking my x402 endpoint's payment challenge during the week
- signature_agent_card: The Calling Card, $0.99 fixed, one-off, instant. Show origins my crawler's Web Bot Auth key directory is set up right, with somebody who is not me saying so
- onpage_audit: The Shop Window, $3 fixed, one-off, instant. Get a signed readout of what my page actually serves a machine reader — title, metadata, structured data — that I can hand to a third party
- launch_check: The Launch Check, $5 fixed, one-off, instant. See my x402 buy path the way a real paying buyer sees it — a genuine settlement attempt, stage by stage, signed
- opening_day: The Opening Day, $9 fixed, covering a 7-day term, one payment, instant. Open my x402 endpoint properly — one real purchase attempt, a week of signed daily checks, and my passport page, under one certificate at one URL
- provenance_check: The Company an Address Keeps, $5 fixed, one-off, instant. Learn which doors have advertised a receiving address and when, signed from the public chain, before routing money at it — or about my own address, free, once proved
- the_statement: The Statement, $0.99 fixed, one-off, instant. Get a neutral signed record of everything my agent's wallet actually moved on chain, to audit against its own ledger
- operator_statement: The Operator's Statement, $21 fixed, covering a 30-day term, one payment, instant. Have my receiving address read off the chain four times a day for a month by a party that is not me — who paid, how many,… [server-provided text truncated]
Input schema (truncated preview — do not copy)
{
"type": "object",
"allOf": [
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "settlement_attestation"
}
}
},
"then": {
"required": [
"tx_hash"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "settlement_reconciliation"
}
}
},
"then": {
"required": [
"tx_hash"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "the_case_file"
}
}
},
"then": {
"required": [
"tx_hash"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "attestation_bundle"
}
}
},
"then": {
"required": [
"tx_hashes"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "standing_watch"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "service_audit"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "a2a_repair_kit"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "good_buyer"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "conformance_watch"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "signature_agent_card"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "onpage_audit"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "launch_check"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "opening_day"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "provenance_check"
}
}
},
"then": {
"required": [
"address"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "the_statement"
}
}
},
"then": {
"required": [
"wallet"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "operator_statement"
}
}
},
"then": {
"required": [
"wallet"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "bitcoin_anchor"
}
}
},
"then": {
"required": [
"digest"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "passport_refresh"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "trust_profile"
}
}
},
"then": {
"required": [
"url"
]
}
},
{
"if": {
"required": [
"item_id"
],
"properties": {
"item_id": {
"const": "spot_check"
}
}
},
"then": {
"required": [
"host"
]
}
}
],
"examples": [
{
"item_id": "settlement_attestation",
"tx_hash": "0x47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee0"
},
{
"item_id": "settlement_reconciliation",
"tx_hash": "0x47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee0"
},
{
"item_id": "the_case_file",
"tx_hash": "0x47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee0"
},
{
"item_id": "attestation_bundle",
"tx_hashes": "0x47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee47c8fee0,0x9b04e1c9b04e1c9b04e1c9b04e1c9b04e1c9b04e1c9b04e1c9b04e1c9b04e1c0"
},
{
"url": "https://your-shop.example/api/buy/thing",
"item_id": "standing_watch"
},
{
"url": "https://your-shop.example/api/buy/thing",
"item_id": "service_audit"
},
{
"url": "https://your-agent.example/.well-known/agent-card.json",
"item_id": "a2a_repair_kit"
},
{
"url": "https://somebody-elses-shop.example/api/buy/thing",
"item_id": "good_buyer"
},
{
"url": "https://your-shop.example/api/buy/thing",
"item_id": "conformance_watch"
},
{
"url": "https://your-agent.example",
"item_id": "signature_agent_card"
},
{
"url": "https://your-site.example/pricing",
"item_id": "onpage_audit"
},
{
"url": "https://your-shop.example/api/buy/thing",
"item_id": "launch_check"
},
{
"url": "https://your-shop.example/api/buy/thing",
"item_id": "opening_day"
},
{
"address": "0x1111111111111111111111111111111111111111",
"item_id": "provenance_check"
},
{
"wallet": "0x843b544bf5f0AA6cbf13E94563874878C98cc4a7",
"item_id": "the_statement"
},
{
"wallet": "0x843b544bf5f0AA6cbf13E94563874878C98cc4a7",
"item_id": "operator_statement"
},
{
"digest": "9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f",
"item_id": "bitcoin_anchor"
},
{
"url": "https://your-endpoint.example/api/thing",
"item_id": "passport_refresh"
},
{
"url": "https://your-endpoint.example/api/thing",
"item_id": "trust_profile"
},
{
"host": "your-door.example",
"item_id": "spot_check"
}
],
"required": [
"item_id"
],
"properties": {
"url": {
"type": "string",
"format": "uri",
"description": "Optional. The endpoint the purchase was made at, so the door section can be assembled."
},
"host": {
"type": "string",
"pattern": "^\\s*(?:[a-zA-Z0-9][a-zA-Z0-9.-]*\\.[a-zA-Z0-9-]+)\\s*$",
"description": "A bare hostname with no scheme, path or port — your-door.example, never https://your-door.example/api. We read our own books about it — corpus rounds, verdicts as recorded, coverage, gaps — and sign what they hold. No request is made to the host; a host we have never met returns not_observed, which is an answer."
},
"claim": {
"type": "string",
"maxLength": 1000,
"description": "Optional. Your own account of what happened, stored verbatim and marked declared. Never checked."
},
"hours": {
"type": "string",
"description": "Optional window in hours back from the chain head: 1 to 11, default 6. The block range (slot range on Solana) on the artifact is the entire coverage claim."
},
"label": {
"type": "string",
"maxLength": 120,
"description": "Optional: your own claim about what the digest covers, stored verbatim and never checked."
},
"model": {
"type": "string",
"maxLength": 64,
"description": "Optional. The model running you, as you would name it: claude-opus-5, gpt-5.6, a local model. Counted, never printed on the certificate."
},
"nonce": {
"type": "string",
"description": "Optional, EVM rails only. Require one authorizer/nonce event paired with its immediately following canonical USDC Transfer, matching every supplied payer, recipient and exact amount. Supply payer when possible: nonces are scoped to an authorizer, and multiple candidates or unrecognised ordering establish no binding. Refused beside a Solana signature — that rail has no such facility, and we will not sign an artifact that silently skipped a requested check."
},
"payer": {
"type": "string",
"description": "Optional payer: 0x EVM address, or Solana public key for a Solana transaction."
},
"client": {
"type": "string",
"maxLength": 64,
"description": "Optional. The harness or framework you run in: claude-code, cursor, openai-agents, langgraph, custom. Counted, never on the certificate."
},
"digest": {
"type": "string",
"pattern": "^[0-9a-fA-F]{64}$",
"description": "sha256 of bytes you keep: exactly 64 hex characters, no 0x prefix, not base64, not the bytes themselves. The store never sees the bytes."
},
"wallet": {
"type": "string",
"pattern": "^\\s*(?:0x[0-9a-fA-F]{40}|[1-9A-HJ-NP-Za-km-z]{32,44})\\s*$",
"description": "The wallet to state: a 0x address (0x plus 40 hex characters) on the selected EVM network, or a base58 pubkey on Solana. Every USDC transfer in and out over the window, counted, summed and signed — one chain per statement, named on the artifact."
},
"address": {
"type": "string",
"pattern": "^\\s*(?:0x[0-9a-fA-F]{40}|[1-9A-HJ-NP-Za-km-z]{32,44})\\s*$",
"description": "The receiving address to ask about: an EVM address (0x + 40 hex) or a Solana pubkey (base58). The signed chain is read and nothing else; the answer is delivered to you and never published. Your own address is free once proved — GET /api/provenance/self."
},
"item_id": {
"enum": [
"settlement_attestation",
"settlement_reconciliation",
"the_case_file",
"attestation_bundle",
"standing_watch",
"service_audit",
"a2a_repair_kit",
"good_buyer",
"conformance_watch",
"signature_agent_card",
"onpage_audit",
"launch_check",
"opening_day",
"provenance_check",
"the_statement",
"operator_statement",
"bitcoin_anchor",
"passport_refresh",
"trust_profile",
"spot_check"
],
"type": "string",
"description": "Which item on this shelf to buy. Required. Each item's own required fields are listed in this schema's allOf branches and in
… [server-provided details truncated]