Avro Schema Audit
Audit one Avro schema for what it makes impossible later. Reports a field with no default, which cannot be removed without breaking readers; a nullable field with no default; a null default where null is not the first union branch, which is invalid; an enum with no default, which makes adding a symbol permanently breaking; an absent namespace on a top-level record; a logical type on a base the specification disallows; and a binary float on a monetary field name.
OtherLiveeip155:8453Exactvia cdp
AvroSchema designKafkaRelease gateDeveloper tooling
Settlements · 30d
219↓ 44%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$25.35
Verified settled volume
256 settlements proven x402 by their on-chain EIP-3009 marker.
$0.120
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 2026-10-04 08:23Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x25e8245f07d5e4873987293dad666afbe56a9608The 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": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "120000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://api.zfinia.com/x402/v1/avro-schema-audit",
"tags": [
"avro",
"schema design",
"kafka",
"release gate",
"developer tooling"
],
"mimeType": "application/json",
"description": "Audit one Avro schema for what it makes impossible later. Reports a field with no default, which cannot be removed without breaking readers; a nullable field with no default; a null default where null is not the first union branch, which is invalid; an enum with no default, which makes adding a symbol permanently breaking; an absent namespace on a top-level record; a logical type on a base the specification disallows; and a binary float on a monetary field name.",
"serviceName": "Avro Schema Audit"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"schema": {
"name": "Invoice",
"type": "record",
"fields": [
{
"name": "invoice_id",
"type": "string"
},
{
"name": "amount",
"type": "double"
},
{
"name": "issued_at",
"type": {
"type": "string",
"logicalType": "timestamp-millis"
}
},
{
"name": "memo",
"type": [
"string",
"null"
],
"default": null
},
{
"name": "state",
"type": {
"name": "State",
"type": "enum",
"symbols": [
"DRAFT",
"SENT"
]
}
}
]
},
"require_documentation": true
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"root": "record Invoice",
"valid": false,
"limits": {
"maxFindings": 500,
"maxSdlBytes": 262144,
"maxVersions": 25,
"maxAvroBytes": 262144,
"maxConsumers": 50,
"maxProtoBytes": 262144,
"maxPathsPerConsumer": 200
},
"passed": false,
"complete": true,
"findings": [
{
"code": "NAMESPACE_ABSENT",
"detail": "The top-level record Invoice declares no namespace, so its full name is just Invoice and it collides with any other schema of that name in a shared registry.",
"location": "(root)"
},
{
"code": "RECORD_NOT_DOCUMENTED",
"detail": "The record Invoice carries no doc, so a consumer reading the schema alone cannot tell what it represents.",
"location": "(root)"
},
{
"code": "FIELD_WITHOUT_DEFAULT",
"detail": "(root).invoice_id declares no default, so it cannot be removed later without breaking a reader on this schema, and a reader adding it must supply one.",
"location": "(root).invoice_id"
}
],
"node_count": 8,
"request_id": "example-request",
"service_id": "avro_schema_audit",
"assumptions": [
"The findings are about what this schema makes possible later, not only about what is wrong now. A field with no default and an enum with no default are both legal and both make a later change breaking...",
"An Avro default must match the first branch of a union, so a null default with null second is reported as invalid rather than as a style preference.",
"A logicalType on a base the specification does not allow it on is reported, because readers ignore it silently and the field quietly means something else."
],
"limitations": [
"One schema as written. Whether its field names and semantics suit the domain is not assessed, and this is not a certification.",
"valid is true only when nothing above applied. Documentation findings are only produced when require_documentation is set."
],
"observed_at": "2026-10-02T00:00:00.000Z",
"not_examined": [],
"finding_count": 15,
"service_version": "1.0.0",
"findings_by_code": {
"NAMESPACE_ABSENT": 1,
"ENUM_WITHOUT_DEFAULT": 1,
"FIELD_NOT_DOCUMENTED": 5,
"FIELD_WITHOUT_DEFAULT": 4,
"RECORD_NOT_DOCUMENTED": 1,
"LOGICAL_TYPE_BASE_MISMATCH": 1,
"BINARY_FLOAT_FOR_MONETARY_FIELD": 1,
"NULL_DEFAULT_WITH_NULL_NOT_FIRST": 1
},
"named_type_count": 2,
"documentation_checked": true
}
}
},
"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",
"required": [
"schema"
],
"properties": {
"schema": {
"type": [
"object",
"string"
]
},
"require_documentation": {
"type": "boolean"
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.12USDC≈ $0.12 USD
on Base · exact scheme
Pay 0.12 USDC on Base to 0x25e8…a9608. The signed payment is good for 1 minute.
- Paid to
- 0x25e8…a9608
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 120000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "120000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"schema": {
"name": "Invoice",
"type": "record",
"fields": [
{
"name": "invoice_id",
"type": "string"
},
{
"name": "amount",
"type": "double"
},
{
"name": "issued_at",
"type": {
"type": "string",
"logicalType": "timestamp-millis"
}
},
{
"name": "memo",
"type": [
"string",
"null"
],
"default": null
},
{
"name": "state",
"type": {
"name": "State",
"type": "enum",
"symbols": [
"DRAFT",
"SENT"
]
}
}
]
},
"require_documentation": true
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"root": "record Invoice",
"valid": false,
"limits": {
"maxFindings": 500,
"maxSdlBytes": 262144,
"maxVersions": 25,
"maxAvroBytes": 262144,
"maxConsumers": 50,
"maxProtoBytes": 262144,
"maxPathsPerConsumer": 200
},
"passed": false,
"complete": true,
"findings": [
{
"code": "NAMESPACE_ABSENT",
"detail": "The top-level record Invoice declares no namespace, so its full name is just Invoice and it collides with any other schema of that name in a shared registry.",
"location": "(root)"
},
{
"code": "RECORD_NOT_DOCUMENTED",
"detail": "The record Invoice carries no doc, so a consumer reading the schema alone cannot tell what it represents.",
"location": "(root)"
},
{
"code": "FIELD_WITHOUT_DEFAULT",
"detail": "(root).invoice_id declares no default, so it cannot be removed later without breaking a reader on this schema, and a reader adding it must supply one.",
"location": "(root).invoice_id"
}
],
"node_count": 8,
"request_id": "example-request",
"service_id": "avro_schema_audit",
"assumptions": [
"The findings are about what this schema makes possible later, not only about what is wrong now. A field with no default and an enum with no default are both legal and both make a later change breaking...",
"An Avro default must match the first branch of a union, so a null default with null second is reported as invalid rather than as a style preference.",
"A logicalType on a base the specification does not allow it on is reported, because readers ignore it silently and the field quietly means something else."
],
"limitations": [
"One schema as written. Whether its field names and semantics suit the domain is not assessed, and this is not a certification.",
"valid is true only when nothing above applied. Documentation findings are only produced when require_documentation is set."
],
"observed_at": "2026-10-02T00:00:00.000Z",
"not_examined": [],
"finding_count": 15,
"service_version": "1.0.0",
"findings_by_code": {
"NAMESPACE_ABSENT": 1,
"ENUM_WITHOUT_DEFAULT": 1,
"FIELD_NOT_DOCUMENTED": 5,
"FIELD_WITHOUT_DEFAULT": 4,
"RECORD_NOT_DOCUMENTED": 1,
"LOGICAL_TYPE_BASE_MISMATCH": 1,
"BINARY_FLOAT_FOR_MONETARY_FIELD": 1,
"NULL_DEFAULT_WITH_NULL_NOT_FIRST": 1
},
"named_type_count": 2,
"documentation_checked": true
}
}
},
"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",
"required": [
"schema"
],
"properties": {
"schema": {
"type": [
"object",
"string"
]
},
"require_documentation": {
"type": "boolean"
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-04 08:23Z
- Last indexed by Roundhouse
- 2026-10-05 00:20Z
- Last enriched (probe, favicon, geo)
- 2026-10-05 17:45Z
- 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
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Avro Schema Audit 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=Avro%20Schema%20Audit' 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://api.zfinia.com/x402/v1/avro-schema-audit, 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. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.