SpecDelta
Detect breaking schema changes and permission expansion between two agent tool specifications.
Otheroffline · HTTP 500eip155:8453Exactvia cdp
CompatibilityMcpOpenapiAgentReceipt
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$0.18
Verified settled volume
7 settlements proven x402 by their on-chain EIP-3009 marker.
$0.030
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-07-30 03:41Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xf18e030A22928F2d0A26ce065CCBbdbA6A8Bf137The 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.
0.03USDC≈ $0.03 USD
on Base · exact scheme
Pay 0.03 USDC on Base to 0xf18e…Bf137. The signed payment is good for 5 minutes.
- Paid to
- 0xf18e…Bf137
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 30000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xf18e030A22928F2d0A26ce065CCBbdbA6A8Bf137",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"format": "mcp",
"policy": {
"forbid_new_operations": false,
"max_context_growth_percent": 25
},
"baseline": {
"tools": [
{
"name": "read_order",
"description": "Read an order by id.",
"inputSchema": {
"type": "object",
"required": [
"id"
],
"properties": {
"id": {
"type": "string"
}
}
}
}
]
},
"candidate": {
"tools": [
{
"name": "read_order",
"description": "Read an order by id.",
"inputSchema": {
"type": "object",
"required": [
"id"
],
"properties": {
"id": {
"type": "string"
}
}
}
}
]
},
"idempotency_key": "agent-compare-0001"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"data": {
"issues": [],
"key_id": "ed25519-example",
"status": "COMPATIBLE",
"metrics": {
"operation_count": 1
},
"operation": "compare_specs",
"signature": "base64-signature",
"request_id": "1eea753a-3480-45ac-a7ab-7cc8416e1834",
"generated_at": "2026-07-28T00:00:00+00:00",
"request_hash": "0000000000000000000000000000000000000000000000000000000000000000",
"policy_sha256": "3333333333333333333333333333333333333333333333333333333333333333",
"receipt_sha256": "4444444444444444444444444444444444444444444444444444444444444444",
"baseline_sha256": "1111111111111111111111111111111111111111111111111111111111111111",
"receipt_version": "1.0",
"candidate_sha256": "2222222222222222222222222222222222222222222222222222222222222222",
"validator_version": "0.1.0"
},
"meta": {},
"error": null
}
}
},
"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",
"title": "CompareSpecsRequest",
"required": [
"baseline",
"candidate",
"idempotency_key"
],
"properties": {
"format": {
"enum": [
"auto",
"mcp",
"openai",
"openapi"
],
"type": "string",
"title": "Format",
"default": "auto"
},
"policy": {
"type": "object",
"title": "ComparisonPolicy",
"properties": {
"forbid_new_operations": {
"type": "boolean",
"title": "Forbid New Operations",
"default": false
},
"high_risk_name_patterns": {
"type": "array",
"items": {
"type": "string"
},
"title": "High Risk Name Patterns",
"maxItems": 50
},
"max_context_growth_percent": {
"type": "number",
"title": "Max Context Growth Percent",
"default": 25,
"maximum": 1000,
"minimum": 0
},
"blocked_description_patterns": {
"type": "array",
"items": {
"type": "string"
},
"title": "Blocked Description Patterns",
"maxItems": 50
}
},
"additionalProperties": false
},
"baseline": {
"anyOf": [
{
"type": "object",
"additionalProperties": true
},
{
"type": "array",
"items": {}
}
],
"title": "Baseline"
},
"candidate": {
"anyOf": [
{
"type": "object",
"additionalProperties": true
},
{
"type": "array",
"items": {}
}
],
"title": "Candidate"
},
"idempotency_key": {
"type": "string",
"title": "Idempotency Key",
"pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{7,127}$"
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"data",
"error",
"meta"
],
"properties": {
"data": {
"type": "object",
"title": "SignedSpecReceipt",
"required": [
"operation",
"request_id",
"request_hash",
"candidate_sha256",
"policy_sha256",
"status",
"issues",
"metrics",
"validator_version",
"generated_at",
"key_id",
"receipt_sha256",
"signature"
],
"properties": {
"issues": {
"type": "array",
"items": {
"type": "object",
"title": "SpecIssue",
"required": [
"code",
"severity",
"message"
],
"properties": {
"code": {
"type": "string",
"title": "Code",
"pattern": "^[a-z0-9_.-]{2,100}$"
},
"message": {
"type": "string",
"title": "Message",
"maxLength": 500,
"minLength": 1
},
"evidence": {
"type": "object",
"title": "Evidence",
"additionalProperties": true
},
"severity": {
"enum": [
"INFO",
"WARN",
"BREAKING"
],
"type": "string",
"title": "Severity"
},
"operation": {
"anyOf": [
{
"type": "string",
"maxLength": 300
},
{
"type": "null"
}
],
"title": "Operation",
"default": null
}
},
"additionalProperties": false
},
"title": "Issues"
},
"key_id": {
"type": "string",
"title": "Key Id"
},
"status": {
"enum": [
"PASS",
"WARN",
"FAIL",
"COMPATIBLE",
"REVIEW",
"BREAKING"
],
"type": "string",
"title": "Status"
},
"metrics": {
"type": "object",
"title": "Metrics",
"additionalProperties": true
},
"operation": {
"enum": [
"lint_spec",
"compare_specs"
],
"type": "string",
"title": "Operation"
},
"signature": {
"type": "string",
"title": "Signature"
},
"request_id": {
"type": "string",
"title": "Request Id"
},
"generated_at": {
"type": "string",
"title": "Generated At"
},
"request_hash": {
"type": "string",
"title": "Request Hash",
"pattern": "^[0-9a-f]{64}$"
},
"policy_sha256": {
"type": "string",
"title": "Policy Sha256",
"pattern": "^[0-9a-f]{64}$"
},
"receipt_sha256": {
"type": "string",
"title": "Receipt Sha256",
"pattern": "^[0-9a-f]{64}$"
},
"baseline_sha256": {
"anyOf": [
{
"type": "string",
"pattern": "^[0-9a-f]{64}$"
},
{
"type": "null"
}
],
"title": "Baseline Sha256",
"default": null
},
"receipt_version": {
"type": "string",
"const": "1.0",
"title": "Receipt Version",
"default": "1.0"
},
"candidate_sha256": {
"type": "string",
"title": "Candidate Sha256",
"pattern": "^[0-9a-f]{64}$"
},
"validator_version": {
"type": "string",
"title": "Validator Version"
}
},
"additionalProperties": false
},
"meta": {
"type": "object"
},
"error": {
"type": [
"object",
"null"
]
}
}
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": true
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-07-30 03:41Z
- Last indexed by Roundhouse
- 2026-08-29 03:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-12 18:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 500
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. 4 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 SpecDelta 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=SpecDelta' 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://specdelta-kl4hfo6j2q-as.a.run.app/v1/spec/compare, 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.