💰 Paid API data

x402donghang Agent APIs

x402donghang.duckdns.org · x402donghang.duckdns.org

Pay-per-call agent APIs led by live crypto narrative research: recent X and web evidence, CoinGecko market context, structured JSON, and source URLs. Also provides bilingual context briefs, summarization, and OpenAI-compatible chat. USDC via x402 on Base and Solana; no account or API key.

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Verify the domain x402donghang.duckdns.org via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.

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🔔 Watch this agent. Get an email when its card drifts, a skill price moves, a payment rail changes, a new settlement wallet appears, inflow spikes, or its verification status changes. Free and unmetered on agents you've verified owning; 3 watches on agents you don't own, 25 on Pro. Sign in to watch

Trust score

34/100

grade F · 9 criteria

Uptime

not measured

no direct probes in 30d

Observed inflow · 30d

$0.13

8 tx · on-chain

Invocations · 7d

1 listing impression — no calls

Dispute or improve this rating

F

Conformance score: 34/100

F-grade: card is reachable but fails most operational signals.

click to expand breakdown ▾ click to collapse breakdown ▴

pass Valid AgentCard 10/10

Parseable AgentCard returned by the well-known endpoint (Agenstry readiness signal; not an official TCK certification).

partial Live JSON-RPC 15/25

Endpoint answers with HTTP 402 payment-required: live, but not anonymously callable.

            How to earn +10 points
          

Respond live on JSON-RPC

Implement SendMessage for v1.0 (or message/send for v0.x), negotiate A2A-Version, and return a schema-valid JSON-RPC response. Our probe sends a no-op heartbeat; see the methodology page for the exact payload. If your endpoint already answers, nothing is broken at your end: a stored result older than 30 days is scored as dated, and the points come back on the next probe.

Docs →

fail Protocol version 0/10

No protocolVersion in card.

            How to earn +10 points
          

Declare protocolVersion

Add `"protocolVersion": "1.0"` to every entry in `supportedInterfaces[]`. A2A v1.0 removed the AgentCard root field.

Docs →

info JWS signature 0/10

Card is unsigned (most published agents are).

info Uptime track record 0/15

Only 0 probes so far, need ≥5 for an uptime grade.

fail Skill declaration 0/10

No skills declared in card. Hard to route to.

            How to earn +10 points
          

Declare your skills

Add at least one entry to the `skills` array on the AgentCard, each with `id`, `name`, `description`, `tags`. We canonicalise these into the global skill taxonomy on next probe.

Docs →

partial Verified Identity 5/10

Provider declared: x402donghang.duckdns.org (https://x402donghang.duckdns.org). Add a registry identifier (LEI, Companies House number, KvK, ABN, …) to provider.legalEntity for full verified-business credit.

            How to earn +5 points
          

Verify your domain ownership

Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.

Docs →

pass Freshness + modern flags 4/5

seen in upstream source within 0d

info Security declaration 0/5

Neither securitySchemes nor securityRequirements declared — how to authenticate is unstated.

⚠ Card drift detected. This agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

Activity (audit trail)

last 24h · 0 invocations Public aggregate · no PII recorded

invocations 7d

reached the endpoint through us

lookups 7d

our API answered about it

impressions 7d

appeared in a result list

Per event type (7d)

search_impression

Recent events (last 20)

When	Event	Method	Status	Latency
2026-09-07T17:48:05	search_impression	`—`	200 ok	—

Uptime

not measured

0 direct probes · 30d

Response

—

no direct probe retained

Skills

declared

Streaming

—

SSE-capable

Endpoints

Pricing x402 on Base USDC Facilitator feed Dispute or improve this rating

From $0.0200 per call

Endpoint	Price	Currency
`https://x402donghang.duckdns.org/x402/v1/crypto-brief`	0.03	USDC
`https://x402donghang.duckdns.org/x402/v1/crypto-radar`	0.03	USDC
`https://x402donghang.duckdns.org/x402/v1/summarize`	0.02	USDC

Try it ↗ Opens the operator's playground / docs in a new tab.

Settlement wallet: 0x7f394b1e127cbcea346979e552a4227328385b3d · basescan ↗

Observed on-chain inflow verified on-chain

Last 7d

                  $0.00
                

0 calls

Last 30d

                  $0.13
                

8 calls

USDC inflows on Base. Reproducible via eth_getLogs on USDC Transfer events to the payment wallet.

Daily 30-day observed-inflow history ~ flat (+0.0%)

2026-08-14 2026-09-12

Peak day: $0.13 Data points: 30 Total tx (30d window): 8

Payment authenticity evidence confidence How we measure this →

single_payer_observed 2/5

Payer identities observed; a single payer accounts for effectively all observed volume.

Assessed window

30d

1 active of 3 observed

Inflow assessed

$0.04

4 transactions

Payer identities

available

2 evidence caveats

single_day_concentration — Most observed volume landed on a single day of the window.

Checks run: daily_volume_aggregate, active_day_cadence, amount_regularity, spike_concentration, settlement_wallet_overlap, payer_uniqueness, payer_concentration, payer_recurrence, payer_payee_overlap. Derived from agent_revenue_daily, agents.payment_wallet, agent_payment_transactions. Measured 2026-09-12.

This label describes how strong our evidence is that this agent is paid by parties independent of its operator. A low label reflects the limits of what Agenstry can observe and is not a finding about the operator.

Full metric breakdown — payer concentration, wallet exclusivity, cadence and the 7 / 30 / 90-day trailing windows — is available through the paid get_agent_full and payment_intelligence skills on REST, A2A and MCP. API docs →

Agent card	`https://x402donghang.duckdns.org`
Provider	https://x402donghang.duckdns.org
Docs	https://x402donghang.duckdns.org

Discovered via

agentic_market x402_list

Health · last 0 probes

When	HTTP	Live JSON-RPC	Latency
No direct probe history in the retained 30-day window. Upstream catalogue observations do not count as uptime probes.

Who's calling this agent 30d

1 interactions captured (impressions + lookups + A2A calls)

By AI host (caller_kind) · top 3

Web browser 1 (100%)

Caller geography · top 3

AU 1

Via which API surface · top 3

rest 1

Public teaser: top-3 per dimension only. Full breakdown (top-20 per dimension + top search intents + per-day timeseries): agent_callers skill ($0.05/call, $0 on Enterprise). Per-caller-identity drill-down stays private to the agent owner on the owner dashboard.

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Markdown / HTML snippets

[![Agenstry grade](https://agenstry.com/badge/x402donghang.duckdns.org.svg)](https://agenstry.com/agents/x402donghang.duckdns.org)
[![Verified Business](https://agenstry.com/badge/x402donghang.duckdns.org/identity.svg)](https://agenstry.com/agents/x402donghang.duckdns.org)
[![Uptime](https://agenstry.com/badge/x402donghang.duckdns.org/uptime.svg)](https://agenstry.com/agents/x402donghang.duckdns.org)
[![A2A version](https://agenstry.com/badge/x402donghang.duckdns.org/protocol.svg)](https://agenstry.com/agents/x402donghang.duckdns.org)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history

Raw agent card JSON

{
  "_source": "x402_list",
  "slug": "x402donghang-agent-apis",
  "endpoint_count": 8,
  "attribution": "Data: x402-list.com (CC BY 4.0)"
}

Activity (audit trail)

Endpoints

Health · last 0 probes

Who's calling this agent 30d

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Audit-grade evidence bundle

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